Document:

EX-10.1

 Exhibit 10.1 

EXECUTION VERSION 

THIRD AMENDED AND RESTATED CREDIT AGREEMENT 

Dated as of July 17, 2014 

among 
 THE FINANCIAL
INSTITUTIONS NAMED HEREIN 
 as the Lenders 

and 
 BANK OF AMERICA, N.A.

 as the Agent 

DEUTSCHE BANK AG SECURITIES INC., 

JPMORGAN CHASE BANK, N.A., 

and 
 WELLS FARGO CAPITAL
FINANCE, LLC 
 as Co-Syndication Agents 

BANK OF AMERICA, N.A. 
 as
the Sole Lead Arranger and Book Runner 
 and 

WESTLAKE CHEMICAL CORPORATION 

and each other Person listed on Schedule 1 hereto, 

as the Borrowers 
 $400,000,000

 TABLE OF CONTENTS 

 

							
	 Section
	    	 	  	Page	 
		
	 ARTICLE 1. LOANS AND LETTERS OF CREDIT
	  	 	1	  
	 1.1
	    	 Total Facility.
	  	 	1	  
	 1.2
	    	 Revolving Loans.
	  	 	2	  
	 1.3
	    	 Letters of Credit.
	  	 	5	  
	 1.4
	    	 Bank Products.
	  	 	10	  
		
	 ARTICLE 2. INTEREST AND FEES
	  	 	10	  
	 2.1
	    	 Interest.
	  	 	10	  
	 2.2
	    	 Continuation and Conversion Elections.
	  	 	11	  
	 2.3
	    	 Maximum Interest Rate.
	  	 	12	  
	 2.4
	    	 Closing Fee.
	  	 	12	  
	 2.5
	    	 Unused Line Fee.
	  	 	12	  
	 2.6
	    	 Letter of Credit Fee.
	  	 	13	  
		
	 ARTICLE 3. PAYMENTS AND PREPAYMENTS
	  	 	13	  
	 3.1
	    	 Revolving Loans.
	  	 	13	  
	 3.2
	    	 Full or Partial Termination of Facility.
	  	 	13	  
	 3.3
	    	 Prepayments of the Loans.
	  	 	13	  
	 3.4
	    	 LIBOR Rate Loan Prepayments.
	  	 	14	  
	 3.5
	    	 Payments by the Borrowers.
	  	 	14	  
	 3.6
	    	 Payments as Revolving Loans.
	  	 	15	  
	 3.7
	    	 Apportionment, Application and Reversal of Payments.
	  	 	15	  
	 3.8
	    	 Indemnity for Returned Payments.
	  	 	15	  
	 3.9
	    	 Agent’s and Lenders’ Books and Records; Monthly Statements.
	  	 	16	  
		
	 ARTICLE 4. TAXES, YIELD PROTECTION AND ILLEGALITY
	  	 	16	  
	 4.1
	    	 Taxes.
	  	 	16	  
	 4.2
	    	 Lender Tax Information.
	  	 	18	  
	 4.3
	    	 Illegality.
	  	 	20	  
	 4.4
	    	 Increased Costs; Capital Adequacy.
	  	 	20	  
	 4.5
	    	 Funding Losses.
	  	 	21	  
	 4.6
	    	 Inability to Determine Rates.
	  	 	21	  
	 4.7
	    	 Certificates of the Agent.
	  	 	21	  
	 4.8
	    	 Delay in Requests.
	  	 	22	  
	 4.9
	    	 Mitigation.
	  	 	22	  
	 4.10
	    	 Replacement of Lenders.
	  	 	22	  
	 4.11
	    	 Survival.
	  	 	22	  
		
	 ARTICLE 5. BOOKS AND RECORDS; FINANCIAL INFORMATION; NOTICES
	  	 	22	  
	 5.1
	    	 Books and Records.
	  	 	22	  
	 5.2
	    	 Financial Information.
	  	 	23	  
	 5.3
	    	 Notices to the Agent.
	  	 	26	  
		
	 ARTICLE 6. GENERAL WARRANTIES AND REPRESENTATIONS
	  	 	28	  
	 6.1
	    	 Authorization, Validity, and Enforceability of this Agreement and the Loan Documents.
	  	 	28	  
	 6.2
	    	 Validity and Priority of Security Interest.
	  	 	28	  

  
 i 

							
	 6.3
	    	 Organization and Qualification.
	  	 	29	  
	 6.4
	    	 Corporate Name; Prior Transactions.
	  	 	29	  
	 6.5
	    	 Subsidiaries and Affiliates.
	  	 	29	  
	 6.6
	    	 Financial Statements and Projections.
	  	 	29	  
	 6.7
	    	 Solvency.
	  	 	29	  
	 6.8
	    	 Real Estate; Leases.
	  	 	30	  
	 6.9
	    	 Proprietary Rights.
	  	 	30	  
	 6.10
	    	 Trade Names.
	  	 	30	  
	 6.11
	    	 Litigation.
	  	 	30	  
	 6.12
	    	 Labor Disputes.
	  	 	30	  
	 6.13
	    	 Environmental Laws.
	  	 	31	  
	 6.14
	    	 No Violation of Law.
	  	 	32	  
	 6.15
	    	 No Default.
	  	 	32	  
	 6.16
	    	 ERISA Compliance.
	  	 	32	  
	 6.17
	    	 Taxes.
	  	 	32	  
	 6.18
	    	 Regulated Entities.
	  	 	33	  
	 6.19
	    	 Use of Proceeds; Margin Regulations.
	  	 	33	  
	 6.20
	    	 Copyrights, Patents, Trademarks and Licenses, etc.
	  	 	33	  
	 6.21
	    	 No Material Adverse Change.
	  	 	33	  
	 6.22
	    	 Full Disclosure.
	  	 	33	  
	 6.23
	    	 Locations of Collateral.
	  	 	34	  
	 6.24
	    	 Deposit Accounts.
	  	 	34	  
	 6.25
	    	 Governmental Authorization.
	  	 	34	  
	 6.26
	    	 No Restrictions.
	  	 	34	  
	 6.27
	    	 OFAC.
	  	 	34	  
	 6.28
	    	 Anti-Corruption Laws.
	  	 	34	  
		
	 ARTICLE 7. AFFIRMATIVE AND NEGATIVE COVENANTS
	  	 	35	  
	 7.1
	    	 Taxes and Other Obligations.
	  	 	35	  
	 7.2
	    	 Legal Existence and Good Standing.
	  	 	35	  
	 7.3
	    	 Compliance with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents.
	  	 	35	  
	 7.4
	    	 Maintenance of Property; Inspection of Property.
	  	 	35	  
	 7.5
	    	 Insurance.
	  	 	36	  
	 7.6
	    	 Insurance and Condemnation Proceeds.
	  	 	37	  
	 7.7
	    	 Environmental Laws.
	  	 	37	  
	 7.8
	    	 Compliance with ERISA.
	  	 	37	  
	 7.9
	    	 Mergers; Consolidations; or Sales.
	  	 	38	  
	 7.10
	    	 Distributions; Capital Change; Restricted Investments.
	  	 	40	  
	 7.11
	    	 Transactions Affecting Collateral or Obligations.
	  	 	42	  
	 7.12
	    	 Guaranties.
	  	 	42	  
	 7.13
	    	 Debt.
	  	 	42	  
	 7.14
	    	 Payment / Prepayment of Debt.
	  	 	43	  
	 7.15
	    	 Transactions with Affiliates.
	  	 	44	  
	 7.16
	    	 Business Conducted.
	  	 	46	  
	 7.17
	    	 Liens.
	  	 	46	  
	 7.18
	    	 Sale and Leaseback Transactions.
	  	 	46	  
	 7.19
	    	 New Subsidiaries.
	  	 	46	  
	 7.20
	    	 Fiscal Year.
	  	 	46	  
	 7.21
	    	 Fixed Charge Coverage Ratio.
	  	 	46	  
	 7.22
	    	 Use of Proceeds.
	  	 	46	  

  
 ii 

							
	 7.23
	    	 Collateral.
	  	 	47	  
	 7.24
	    	 [Reserved].
	  	 	48	  
	 7.25
	    	 Permitted Acquisitions.
	  	 	48	  
	 7.26
	    	 Excluded Deposit Accounts.
	  	 	49	  
	 7.27
	    	 Further Assurances.
	  	 	50	  
	 7.28
	    	 Designation of Restricted and Unrestricted Subsidiaries; Restricted Investments in Unrestricted Subsidiaries.
	  	 	50	  
	 7.29
	    	 Anti-Corruption Laws.
	  	 	52	  
		
	 ARTICLE 8. CONDITIONS OF LENDING
	  	 	52	  
	 8.1
	    	 Conditions Precedent to Making of Loans on the Closing Date.
	  	 	52	  
	 8.2
	    	 Conditions Precedent to Each Loan.
	  	 	54	  
		
	 ARTICLE 9. DEFAULT; REMEDIES
	  	 	54	  
	 9.1
	    	 Events of Default.
	  	 	54	  
	 9.2
	    	 Remedies.
	  	 	57	  
		
	 ARTICLE 10. TERM AND TERMINATION
	  	 	58	  
	 10.1
	    	 Term and Termination.
	  	 	58	  
		
	 ARTICLE 11. AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS
	  	 	59	  
	 11.1
	    	 Amendments and Waivers.
	  	 	59	  
	 11.2
	    	 Assignments; Participations.
	  	 	60	  
		
	 ARTICLE 12. THE AGENT
	  	 	63	  
	 12.1
	    	 Appointment and Authorization.
	  	 	63	  
	 12.2
	    	 Delegation of Duties.
	  	 	63	  
	 12.3
	    	 Liability of Agent.
	  	 	63	  
	 12.4
	    	 Reliance by Agent.
	  	 	64	  
	 12.5
	    	 Notice of Default.
	  	 	64	  
	 12.6
	    	 Credit Decision.
	  	 	64	  
	 12.7
	    	 Indemnification.
	  	 	65	  
	 12.8
	    	 Agent in Individual Capacity.
	  	 	65	  
	 12.9
	    	 Successor Agent.
	  	 	65	  
	 12.10
	    	 Collateral Matters.
	  	 	65	  
	 12.11
	    	 Restrictions on Actions by Lenders; Sharing of Payments.
	  	 	67	  
	 12.12
	    	 Agency for Perfection.
	  	 	68	  
	 12.13
	    	 Payments by Agent to Lenders.
	  	 	68	  
	 12.14
	    	 Settlement.
	  	 	68	  
	 12.15
	    	 Concerning the Collateral and the Related Loan Documents.
	  	 	71	  
	 12.16
	    	 Field Audit and Examination Reports; Disclaimer by Lenders.
	  	 	71	  
	 12.17
	    	 Relation Among Lenders.
	  	 	72	  
	 12.18
	    	 Co-Agents.
	  	 	72	  
	 12.19
	    	 Bank Product Providers.
	  	 	72	  
		
	 ARTICLE 13. MISCELLANEOUS
	  	 	72	  
	 13.1
	    	 No Waivers; Cumulative Remedies.
	  	 	72	  
	 13.2
	    	 Severability.
	  	 	73	  
	 13.3
	    	 Governing Law; Choice of Forum; Service of Process.
	  	 	73	  
	 13.4
	    	 WAIVER OF JURY TRIAL.
	  	 	74	  

  
 iii 

							
	 13.5
	    	 Survival of Representations and Warranties.
	  	 	74	  
	 13.6
	    	 Other Security and Guaranties.
	  	 	74	  
	 13.7
	    	 Fees and Expenses.
	  	 	75	  
	 13.8
	    	 Notices.
	  	 	75	  
	 13.9
	    	 Waiver of Notices.
	  	 	77	  
	 13.10
	    	 Binding Effect.
	  	 	77	  
	 13.11
	    	 Indemnity of the Agent, the Arranger, the Letter of Credit Issuers and the Lenders by the Borrowers.
	  	 	77	  
	 13.12
	    	 Limitation of Liability.
	  	 	78	  
	 13.13
	    	 No Advisory or Fiduciary Responsibility.
	  	 	78	  
	 13.14
	    	 Final Agreement.
	  	 	78	  
	 13.15
	    	 Counterparts.
	  	 	79	  
	 13.16
	    	 Captions.
	  	 	79	  
	 13.17
	    	 Right of Setoff.
	  	 	79	  
	 13.18
	    	 Confidentiality.
	  	 	79	  
	 13.19
	    	 Conflicts with Other Loan Documents.
	  	 	80	  
	 13.20
	    	 Westlake as Agent.
	  	 	80	  
	 13.21
	    	 Patriot Act Notice.
	  	 	81	  
	 13.22
	    	 Restatement of Existing Credit Agreement.
	  	 	81	  
	 13.23
	    	 Confirmations.
	  	 	81	  
	 13.24
	    	 Electronic Execution.
	  	 	82	  
	 13.25
	    	 Consent to MLP Transaction.
	  	 	82	  

 ANNEXES, EXHIBITS AND SCHEDULES 
  

					
	ANNEX A	  	–	  	DEFINITIONS
	EXHIBIT A	  	–	  	FORM OF NOTE
	EXHIBIT B	  	–	  	FORM OF BORROWING BASE CERTIFICATE
	EXHIBIT C	  	–	  	FORM OF OBLIGATION GUARANTY
	EXHIBIT D	  	–	  	FORM OF NOTICE OF BORROWING
	EXHIBIT E	  	–	  	FORM OF NOTICE OF CONTINUATION/CONVERSION
	EXHIBIT F	  	–	  	FORM OF ASSIGNMENT AND ACCEPTANCE AGREEMENT
	EXHIBIT G	  	–	  	FORM OF COMPLIANCE CERTIFICATE
			
	SCHEDULE 1	  	–	  	BORROWERS
	SCHEDULE 1.2	  	–	  	LENDERS’ COMMITMENTS
	SCHEDULE 6.4	  	–	  	PRIOR CORPORATE NAMES
	SCHEDULE 6.5	  	–	  	SUBSIDIARIES AND AFFILIATES
	SCHEDULE 6.9	  	–	  	PROPRIETARY RIGHTS
	SCHEDULE 6.10	  	–	  	TRADE NAMES
	SCHEDULE 6.11	  	–	  	LITIGATION
	SCHEDULE 6.12	  	–	  	LABOR DISPUTES
	SCHEDULE 6.13	  	–	  	ENVIRONMENTAL LAW
	SCHEDULE 6.16	  	–	  	ERISA COMPLIANCE
	SCHEDULE 6.23	  	–	  	LOCATIONS OF COLLATERAL
	SCHEDULE 6.24	  	–	  	DEPOSIT ACCOUNTS
	SCHEDULE 7.10	  	–	  	EXISTING INVESTMENTS
	SCHEDULE 7.13	  	–	  	DEBT AND EXISTING LETTERS OF CREDIT
	SCHEDULE 7.17	  	–	  	EXISTING LIENS
	SCHEDULE 13.25	  		  	FORMATION TRANSACTIONS AND PARTNERSHIP STRUCTURE; PROSPECTUS SUMMARY

  
 iv 

 Exhibit 10.1 

THIRD AMENDED AND RESTATED CREDIT AGREEMENT 

This Third Amended and Restated Credit Agreement, dated as of July 17, 2014 (this “Agreement”) among the
financial institutions from time to time parties hereto (such financial institutions, together with their respective successors and assigns, are referred to hereinafter each individually as a “Lender” and collectively as the
“Lenders”), Bank of America, N.A. with an office at 901 Main Street, Dallas, Texas, 75202, as agent for the Lenders (in its capacity as agent, the “Agent”), and Westlake Chemical Corporation, a
Delaware corporation (“Westlake”) and certain of its domestic subsidiaries listed on Schedule 1 hereto, each with offices at 2801 Post Oak Boulevard, Houston, Texas 77056 (each a
“Borrower” and collectively, all Borrowers, including Westlake, the “Borrowers”). 
 W I T
N E S S E T H: 
 WHEREAS, Westlake and certain of its domestic subsidiaries as borrowers, the Agent, and lenders party thereto entered
into that certain Credit Agreement dated as of July 31, 2003 (as amended from time to time prior to September 8, 2008, the “2003 Credit Agreement”); 

WHEREAS, the 2003 Credit Agreement was amended and restated in its entirety by that certain Amended and Restated Credit Agreement dated as of
September 8, 2008 (as amended from time to time prior to September 16, 2011, the “2008 Credit Agreement”); 

WHEREAS, the 2008 Credit Agreement was further amended and restated in its entirety by that certain Second Amended and Restated Credit
Agreement dated as of September 16, 2011 (as amended from time to time prior to the date hereof, the “Existing Credit Agreement”); 

WHEREAS, Westlake and other Borrowers have requested that the Lenders amend certain provisions of the Existing Credit Agreement, and the
parties have agreed to amend and restate the Existing Credit Agreement, in each case, upon the terms and conditions set forth in this Agreement; and 

WHEREAS, capitalized terms used in this Agreement and not otherwise defined herein shall have the meanings ascribed thereto in Annex
A, which is attached hereto and incorporated herein; the rules of construction contained therein shall govern the interpretation of this Agreement, and all Annexes, Exhibits, and Schedules attached hereto are incorporated herein by
reference. 
 NOW, THEREFORE, in consideration of the mutual conditions and agreements set forth in this Agreement, and for good and
valuable consideration, the receipt of which is hereby acknowledged, the Lenders, the Agent, and the Borrowers hereby agree as follows. 

ARTICLE 1. 
 LOANS AND
LETTERS OF CREDIT 
 1.1 Total Facility. Subject to all of the terms and conditions of this Agreement, the Lenders agree to make
available a total credit facility of up to $400,000,000 (as such amount may be increased or reduced from time to time pursuant to the terms of this Agreement, the “Total Facility”) to the Borrowers from time to time during
the term of this Agreement. The Total Facility shall be composed of a revolving line of credit consisting of Revolving Loans and Letters of Credit described herein. 

 1.2 Revolving Loans. 

(a) Revolving Loans and Notes. 

(i) Amounts. Subject to the satisfaction of the conditions precedent set forth in Article 8, each Lender
severally, but not jointly, agrees, upon any Borrower’s request from time to time on any Business Day during the period from the Closing Date to the Termination Date, to make revolving loans (the “Revolving Loans”) to
the Borrowers in amounts not to exceed such Lender’s Pro Rata Share of Availability, except for Non-Ratable Loans and Agent Advances. The Lenders, however, in their unanimous discretion, may elect to make Revolving Loans or issue or arrange to
have issued Letters of Credit in excess of the Borrowing Base but not in excess of the Maximum Revolver Amount on one or more occasions, but if they do so, neither the Agent nor the Lenders shall be deemed thereby to have changed the limits of the
Borrowing Base or to be obligated to exceed such limits on any other occasion. If any Borrowing would exceed Availability, the Lenders may refuse to make or may otherwise restrict the making of Revolving Loans as the Lenders determine until such
excess has been eliminated, subject to the Agent’s authority, in its sole discretion, to make Agent Advances pursuant to the terms of Section 1.2(i). 

(ii) The Borrowers shall execute and deliver to each Lender requesting a note, a note, an amended and restated note, or a
second amended and restated note, as applicable, to evidence the Revolving Loan of that Lender. Each note shall be in the principal amount of the requesting Lender’s Pro Rata Share of the Maximum Revolver Amount, dated the date hereof and
substantially in the form of Exhibit A (each a “Note” and, collectively, the “Notes”). Each Note shall represent the obligation of the Borrowers to pay the amount of the requesting
Lender’s Pro Rata Share of the Maximum Revolver Amount, or, if less, such Lender’s Pro Rata Share of the aggregate unpaid principal amount of all Revolving Loans to the Borrowers together with interest thereon as prescribed in
Section 2.1. The entire unpaid balance of the Revolving Loans and all other Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this
Agreement and are not due and payable at such termination) shall be immediately due and payable in full in immediately available funds on the Termination Date. 

(b) Procedure for Borrowing. 

(i) Each Borrowing shall be made upon any Borrower’s irrevocable written notice delivered to the Agent in the form of a
notice of borrowing in substantially the form of Exhibit D (“Notice of Borrowing”) and signed by Westlake, on its behalf and as agent for the other Borrowers, which Notice of Borrowing shall be received by
the Agent prior to (i) 12:00 noon (Houston, Texas time) three (3) Business Days prior to the requested Funding Date, in the case of LIBOR Rate Loans and (ii) 12:30 p.m. (Houston, Texas time) on the requested Funding Date, in the case
of Base Rate Loans, specifying: 
 (A) the amount of the Borrowing, which in the case of a LIBOR Rate Loan must equal or
exceed $5,000,000 (and integral increments of $1,000,000 in excess of such amount); 
 (B) the requested Funding Date, which
must be a Business Day; 
 (C) whether the Revolving Loans requested are to be Base Rate Loans or LIBOR Rate Loans (and if
not specified, it shall be deemed a request for a Base Rate Loan); 

  
 2 

 (D) the duration of the Interest Period for LIBOR Rate Loans (and if not
specified, it shall be deemed a request for an Interest Period of one month); and 
 (E) the Borrower or Borrowers which are
to receive all or any portion of such Borrowing and the amount of such Borrowing to be advanced to such Borrower or Borrowers. 

(ii) In lieu of delivering a Notice of Borrowing, the Borrowers may give the Agent telephonic notice of such request for
advances to the Designated Account on or before the deadline set forth above. The Agent at all times shall be entitled to rely on such telephonic notice in making such Revolving Loans, regardless of whether any written confirmation is received. 

(iii) In lieu of delivering a Notice of Borrowing, the Borrowers may also request Borrowings in accordance with any ancillary
agreements entered into by the Agent and the Borrowers from time to time relating to borrowing procedures. 
 (iv) The
Borrowers shall have no right to request a LIBOR Rate Loan while a Default or Event of Default has occurred and is continuing. 

(c) Reliance upon Authority. Prior to the Closing Date, the Borrowers shall deliver to the Agent, a notice setting forth
the account of the Borrowers (“Designated Account”) to which the Agent is authorized to transfer the proceeds of the Revolving Loans requested hereunder. The Borrowers may designate a replacement account from time to time by
written notice. All such Designated Accounts must be reasonably satisfactory to the Agent. The Agent is entitled to rely conclusively on any person’s request for Revolving Loans on behalf of the Borrowers, so long as the proceeds thereof are to
be transferred to the Designated Account. The Agent has no duty to verify the identity of any individual representing himself or herself as a person authorized by the Borrowers to make such requests on its behalf. 

(d) No Liability. The Agent shall not incur any liability to the Borrowers as a result of acting upon any notice
referred to in Sections 1.2(b) and (c), which the Agent believes in good faith to have been given by an officer or other person duly authorized by any Borrower to request Revolving Loans on its behalf. The crediting
of Revolving Loans to the Designated Account conclusively establishes the obligation of the Borrowers to repay such Revolving Loans as provided herein. 

(e) Notice Irrevocable. Any Notice of Borrowing (or telephonic notice in lieu thereof) made pursuant to
Section 1.2(b) shall be irrevocable. The Borrowers shall be bound to borrow the funds requested therein in accordance therewith. 

(f) Agent’s Election. Promptly after receipt of a Notice of Borrowing (or telephonic notice in lieu thereof), the
Agent shall elect to have the terms of Section 1.2(g) or the terms of Section 1.2(h) apply to such requested Borrowing. If the Bank declines in its sole discretion to make a Non-Ratable Loan pursuant to
Section 1.2(h), the terms of Section 1.2(g) shall apply to the requested Borrowing. 

(g) Making of Revolving Loans. If the Agent elects to have the terms of this Section 1.2(g) apply to
a requested Borrowing, then promptly after receipt of a Notice of Borrowing or telephonic notice in lieu thereof, the Agent shall notify the Lenders by telecopy, 

  
 3 

 
telephone or e-mail of the requested Borrowing. Each Lender shall transfer its Pro Rata Share of the requested Borrowing available to the Agent in immediately available funds, to the account from
time to time designated by the Agent, not later than 2:30 p.m. (Houston, Texas time) on the applicable Funding Date. After the Agent’s receipt of all proceeds of such Revolving Loans, the Agent shall make the proceeds of such Revolving Loans
available to the Borrowers on the applicable Funding Date by transferring same day funds to the Designated Account; provided, however, that the amount of Revolving Loans so made on any date shall not exceed the Availability on such
date. 
 (h) Making of Non-Ratable Loans. 

(i) If any Borrower requests a Base Rate Loan and the Agent elects, with the consent of the Bank, to have the terms of this
Section 1.2(h) apply to a requested Borrowing, the Bank shall make a Revolving Loan in the amount of that Borrowing available to the Borrowers on the applicable Funding Date by transferring same day funds to the Designated
Account. Each Revolving Loan made solely by the Bank pursuant to this Section 1.2(h) is herein referred to as a “Non-Ratable Loan,” and such Revolving Loans are collectively referred to as the
“Non-Ratable Loans.” Each Non-Ratable Loan shall be subject to all the terms and conditions applicable to other Revolving Loans except that all payments thereon shall be payable to the Bank solely for its own account. The
aggregate amount of Non-Ratable Loans outstanding at any time shall not exceed $40,000,000. The Agent shall not request the Bank to make any Non-Ratable Loan if (1) the Agent has received written notice from any Lender that one or more of the
applicable conditions precedent set forth in Article 8 will not be satisfied on the requested Funding Date for the applicable Borrowing, or (2) the requested Borrowing would exceed Availability on that Funding Date. 

(ii) The Non-Ratable Loans shall be secured by the Agent’s Liens in and to the Collateral and shall constitute Base Rate
Loans and Obligations hereunder. 
 (i) Agent Advances. 

(i) Subject to the limitations set forth below, the Agent is authorized by the Borrowers and the Lenders, from time to time in
the Agent’s sole discretion, (A) after the occurrence of a Default or an Event of Default, or (B) at any time that any of the other conditions precedent set forth in Article 8 have not been satisfied, to make Base Rate
Loans to the Borrowers on behalf of the Lenders in an aggregate amount outstanding at any time not to exceed 5% of the Borrowing Base but not in excess of the Maximum Revolver Amount which the Agent, in its reasonable business judgment, deems
necessary or desirable (1) to preserve or protect the Collateral, or any portion thereof, (2) to enhance the likelihood of, or maximize the amount of, repayment of the Revolving Loans and other Obligations, or (3) to pay any other
amount chargeable to the Borrowers pursuant to the terms of this Agreement, including costs, fees, and expenses as described in Section 13.7 (any of such advances are herein referred to as “Agent
Advances”); provided, that the Required Lenders may at any time revoke the Agent’s authorization to make Agent Advances. Any such revocation must be in writing and shall become effective prospectively upon the Agent’s
receipt thereof. 
 (ii) The Agent Advances shall be secured by the Agent’s Liens in and to the Collateral and shall
constitute Base Rate Loans and Obligations hereunder. 

  
 4 

 (j) Increase in Commitments. The Borrowers may request an increase in the
Commitments from time to time upon notice to the Agent, as long as (a) the requested increase is in a minimum amount of $25,000,000 and is offered on the same terms as existing Commitments, except for a closing fee specified by the Borrowers,
(b) increases under this Section do not exceed $200,000,000 in the aggregate and no more than four (4) increases are made, (c) no reduction in Commitments pursuant to Section 3.2 has occurred prior to
the requested increase, (d) the Agent shall have received certified copies of the resolutions of Westlake approving such increase in the Commitments, (e) the increased Commitments shall be on the same terms and conditions as the existing
Commitments, (f) the Borrowers shall deliver any legal opinions or other documents reasonably requested by the Agent, and (g) the Borrowers shall pay, on demand, all fees and reasonable costs and expenses (including Attorney Costs) paid or
incurred by the Agent and the Arranger in connection with the increase in the Commitments. The Agent shall promptly notify Lenders of the requested increase and, within ten (10) Business Days thereafter, each Lender shall notify the Agent if
and to what extent such Lender commits to increase its Commitment; provided that no Lender shall have any obligation to increase its Commitment. Any Lender not responding within such period shall be deemed to have declined an increase. If
Lenders fail to commit to the full requested increase, Eligible Assignees may issue additional Commitments and become Lenders hereunder. The Agent may allocate, in its discretion, the increased Commitments among committing Lenders and, if necessary,
Eligible Assignees. Provided the conditions set forth in Section 8.2 are satisfied, total Commitments shall be increased by the requested amount (or such lesser amount committed by Lenders and Eligible Assignees) on a date
agreed upon by the Agent and the Borrowers, but no later than forty-five (45) days following the Borrowers’ increase request. The Agent, the Borrowers, and new and existing Lenders shall execute and deliver such documents and agreements as
the Agent deems appropriate to evidence the increase in and allocations of the Commitments. On the effective date of an increase, all outstanding Revolving Loans, Letter of Credit Obligations and other exposures shall be reallocated among Lenders,
and settled by the Agent if necessary, in accordance with Lenders’ adjusted shares of such Commitments. 
 1.3 Letters of Credit.

 (a) Agreement to Issue. Subject to the terms and conditions of this Agreement, each Letter of Credit Issuer, as
requested by any Borrower, agrees to issue, and to amend or renew Letters of Credit previously issued by it in accordance with this Section 1.3, for the account of any Borrower one or more commercial/documentary and standby
letters of credit (each a “Letter of Credit” and collectively, the “Letters of Credit”) and the Agent agrees to provide credit support or other enhancement to a letter of credit issuer acceptable to
the Agent, which issues a letter of credit for the account of any Borrower (any such credit support or enhancement being herein referred to as a “Credit Support”) from time to time during the term of this Agreement. All
Existing Letters of Credit shall be deemed to have been issued pursuant hereto, and from and after the Closing Date shall be subject to and governed by the terms and conditions hereof. 

(b) Amounts; Outside Expiration Date. A Letter of Credit Issuer shall not have any obligation to issue any Letter of
Credit and the Agent shall not have any obligation to provide Credit Support at any time if: (i) the maximum face amount of the requested Letter of Credit is greater than the Unused Letter of Credit Subfacility at such time; (ii) the
maximum undrawn amount of the requested Letter of Credit and all commissions, fees, and charges due from the Borrowers in connection with the opening thereof would exceed Availability at such time; or (iii) such Letter of Credit has an
expiration date less than thirty (30) days prior to the Stated Termination Date or more than twelve (12) months from the date of issuance for standby letters of credit and 180 days from the date of issuance for documentary letters of
credit; provided that 

  
 5 

 
any Letter of Credit issued in connection with the IRBs may have an expiration date of not later than the Termination Date. With respect to any Letter of Credit which contains any
“evergreen” or automatic renewal provision, each Lender shall be deemed to have consented to any such extension or renewal unless any such Lender shall have provided to the Agent, written notice that it declines to consent to any
such extension or renewal at least thirty (30) days prior to the date on which the applicable Letter of Credit Issuer is entitled to decline to extend or renew the Letter of Credit. If all of the requirements of this
Section 1.3 are met and no Default or Event of Default has occurred and is continuing, no Lender shall decline to consent to any such extension or renewal. 

(c) Other Conditions. In addition to conditions precedent contained in Article 8, the obligation of a
Letter of Credit Issuer to issue any Letter of Credit and the obligation of the Agent to provide Credit Support is subject to the following conditions precedent having been satisfied in a manner reasonably satisfactory to the Agent: 

(i) The Borrowers shall have delivered to the applicable Letter of Credit Issuer, at such times and in such manner as such
Letter of Credit Issuer may prescribe, an application in form and substance satisfactory to such Letter of Credit Issuer and reasonably satisfactory to the Agent for the issuance of the Letter of Credit and such other documents as may be required
pursuant to the terms thereof, and the form, terms and purpose of the proposed Letter of Credit shall be reasonably satisfactory to the Agent and such Letter of Credit Issuer; and 

(ii) If a Defaulting Lender exists, no Letter of Credit Issuer shall have any obligation to issue any Letter of Credit and the
Agent shall not have any obligation to provide any Credit Support, until such Lender or the Borrowers have entered into arrangements satisfactory to the Agent and the applicable Letter of Credit Issuer to eliminate any Fronting Exposure associated
with the Defaulting Lender; and 
 (iii) As of the date of issuance, no order of any court, arbitrator or Governmental
Authority shall purport by its terms to enjoin or restrain money center banks generally from issuing letters of credit of the type and in the amount of the proposed Letter of Credit, and no law, rule or regulation applicable to money center banks
generally and no request or directive (whether or not having the force of law) from any Governmental Authority with jurisdiction over money center banks generally shall prohibit, or request that the proposed Letter of Credit Issuer refrain from, the
issuance of letters of credit generally or the issuance of such Letters of Credit. 
 (d) Issuance of Letters of
Credit. 
 (i) Request for Issuance. The Borrowers must notify the Agent of a requested Letter of Credit at least
three (3) Business Days prior to the proposed issuance date. Such notice shall be irrevocable and must specify the proposed Letter of Credit Issuer, the original face amount of the Letter of Credit requested, the Business Day of issuance of
such requested Letter of Credit, whether such Letter of Credit is standby, commercial, or documentary, whether such Letter of Credit may be drawn in a single or in partial draws, the Business Day on which the requested Letter of Credit is to expire,
the purpose for which such Letter of Credit is to be issued, and the beneficiary of the requested Letter of Credit. The Borrowers shall attach to such notice the proposed form of the Letter of Credit. 

  
 6 

 (ii) Responsibilities of the Agent; Issuance. As of the Business Day
immediately preceding the requested issuance date of the Letter of Credit, the Agent shall determine the amount of the applicable Unused Letter of Credit Subfacility and Availability. If (A) the face amount of the requested Letter of Credit is
less than the Unused Letter of Credit Subfacility and (B) the amount of such requested Letter of Credit and all commissions, fees, and charges due from the Borrowers in connection with the opening thereof would not exceed Availability, the
Agent shall notify the applicable Letter of Credit Issuer and such Letter of Credit Issuer shall issue the requested Letter of Credit on the requested issuance date so long as the other conditions hereof are met. No Letter of Credit Issuer shall
issue any Letter of Credit without receiving prior notice or confirmation from the Agent that the foregoing clauses (A) and (B) are met. 

(iii) No Extensions or Amendment. No Letter of Credit Issuer shall be obligated to extend or amend any Letter of Credit
issued pursuant hereto unless the requirements of this Section 1.3 are met as though a new Letter of Credit were being requested and issued. 

(e) Assumption of Risk; Rights of Letter of Credit Issuers. 

(i) Assumption of Risk by the Borrowers. The Borrowers assume all risks of the acts, omissions or misuses of any Letter
of Credit by the beneficiary. In connection with issuance of any Letter of Credit, none of the Agent, any Letter of Credit Issuer or any Lender shall be responsible for the existence, character, quality, quantity, condition, packing, value or
delivery of any goods purported to be represented by any Letter of Credit Documents; any differences or variation in the character, quality, quantity, condition, packing, value or delivery of any goods from that expressed in any documents; the form,
validity, sufficiency, accuracy, genuineness or legal effect of any documents or of any endorsements thereon; the time, place, manner or order in which shipment of goods is made; partial or incomplete shipment of, or failure to ship, any goods
referred to in a Letter of Credit or any Letter of Credit Documents; any deviation from instructions, delay, default or fraud by any shipper or other Person in connection with any goods, shipment or delivery; any breach of contract between a shipper
or vendor and a Borrower; errors, omissions, interruptions or delays in transmission or delivery of any messages, by mail, cable, telegraph, telex, telecopy, e-mail, telephone or otherwise; errors in interpretation of technical terms; the
misapplication by a beneficiary of any Letter of Credit or the proceeds thereof; or any consequences arising from causes beyond the control of any Letter of Credit Issuer, the Agent or any Lender, including any act or omission of a Governmental
Authority. The rights and remedies of the Letter of Credit Issuers under the Loan Documents shall be cumulative. The Letter of Credit Issuers shall be fully subrogated to the rights and remedies of each beneficiary whose claims against the Borrowers
are discharged with proceeds of any Letter of Credit. Nothing set forth herein shall prevent the Borrowers, following reimbursement in respect of any Letter of Credit, from asserting claims against a Letter of Credit Issuer for any honor of any
Letter of Credit constituting gross negligence or willful misconduct. 
 (ii) Rights of Letter of Credit Issuers. In
connection with its administration of and enforcement of rights or remedies under any Letters of Credit or Letter of Credit Documents, a Letter of Credit Issuer shall be entitled to act, and shall be fully protected in acting, upon any
certification, documentation or communication in whatever form believed by such Letter of Credit Issuer, in good faith, to be genuine and correct and to have been signed, sent or made by a proper Person. A Letter of Credit Issuer may consult

  
 7 

 
with and employ legal counsel, accountants and other experts to advise it concerning its obligations, rights and remedies, and shall be entitled to act upon, and shall be fully protected in any
action taken in good faith reliance upon, any advice given by such experts. A Letter of Credit Issuer may employ agents and attorneys-in-fact in connection with any matter relating to Letters of Credit or Letter of Credit Documents, and shall not be
liable for the negligence or misconduct of agents and attorneys-in-fact selected with reasonable care. 
 (iii) Account
Party. The Borrowers hereby authorize and direct any Letter of Credit Issuer to name any Borrower as the “Account Party” therein and to deliver to the Agent all instruments, documents, and other writings and property received by
such Letter of Credit Issuer pursuant to the Letter of Credit, and to accept and rely upon the Agent’s instructions and agreements with respect to all matters arising in connection with the Letter of Credit or the application therefor. 

(f) Reimbursement; Participations. 

(i) If any Letter of Credit Issuer honors any request for payment under a Letter of Credit, the Borrowers shall pay to such
Letter of Credit Issuer, on the same day (“Reimbursement Date”), the amount paid by such Letter of Credit Issuer under such Letter of Credit, together with interest at the interest rate for Base Rate Loans from the
Reimbursement Date until payment by the Borrowers. The obligation of the Borrowers to reimburse a Letter of Credit Issuer for any payment made under a Letter of Credit shall be absolute, unconditional, irrevocable, and joint and several, and shall
be paid without regard to any lack of validity or enforceability of any Letter of Credit or the existence of any claim, setoff, defense or other right that the Borrowers may have at any time against the beneficiary. Whether or not the Borrowers
submit a Notice of Borrowing, the Borrowers shall be deemed to have requested a Borrowing of Base Rate Loans in an amount necessary to pay all amounts due a Letter of Credit Issuer on any Reimbursement Date and each Lender agrees to fund its Pro
Rata Share of such Borrowing whether or not the Commitments have terminated, an overadvance exists or is created thereby, or the conditions in Article 8 are satisfied. 

(ii) Upon issuance of a Letter of Credit, each Lender shall be deemed to have irrevocably and unconditionally purchased from
the applicable Letter of Credit Issuer, without recourse or warranty, an undivided Pro Rata Share interest and participation in all Letter of Credit Obligations relating to such Letter of Credit. If a Letter of Credit Issuer makes any payment under
a Letter of Credit and the Borrowers do not reimburse such payment on the Reimbursement Date, the Agent shall promptly notify the Lenders and each Lender shall promptly (within one Business Day) and unconditionally pay to the Agent, for the benefit
of such Letter of Credit Issuer, the Lender’s Pro Rata Share of such payment. Upon request by a Lender, a Letter of Credit Issuer shall furnish copies of any Letters of Credit and Letter of Credit Documents in its possession at such time. 

(iii) The obligation of each Lender to make payments to the Agent for the account of a Letter of Credit Issuer in connection
with such Letter of Credit Issuer’s payment under a Letter of Credit shall be absolute, unconditional and irrevocable, not subject to any counterclaim, setoff, qualification or exception whatsoever, and shall be made in accordance with this
Agreement under all circumstances, irrespective of any lack of validity or unenforceability of any Loan Documents; any draft, certificate or other document presented under a Letter of Credit having been determined to be forged,

  
 8 

 
fraudulent, invalid or insufficient in any respect or any statement therein being untrue or inaccurate in any respect; or the existence of any setoff or defense that any Loan Party may have with
respect to any Obligations. The Letter of Credit Issuers do not assume any responsibility for any failure or delay in performance or any breach by any Borrower or other Person of any obligations under any Letter of Credit Documents. The Letter of
Credit Issuers do not make to Lenders any express or implied warranty, representation or guaranty with respect to the Collateral, the Letter of Credit Documents or any Account Party. The Letter of Credit Issuers shall not be responsible to any
Lender for any recitals, statements, information, representations or warranties contained in, or for the execution, validity, genuineness, effectiveness or enforceability of any Letter of Credit Documents; the validity, genuineness, enforceability,
collectibility, value or sufficiency of any Collateral or the perfection of any Lien therein; or the assets, liabilities, financial condition, results of operations, business, creditworthiness or legal status of any Account Party. 

(iv) No Letter of Credit Indemnitee shall be liable to any Lender or other Person for any action taken or omitted to be taken
in connection with any Letter of Credit Documents except as a result of its actual gross negligence or willful misconduct. A Letter of Credit Issuer shall not have any liability to any Lender if such Letter of Credit Issuer refrains from any action
under a Letter of Credit or Letter of Credit Documents until it receives written instructions from Required Lenders. 
 (g)
Supporting Letter of Credit; Cash Collateral. (i) If, notwithstanding the provisions of Section 1.3(b) and Section 10.1, any Letter of Credit or Credit Support is outstanding upon the termination of
this Agreement, then upon such termination the Borrowers shall deposit with the Agent, for the ratable benefit of the Agent and the Lenders, with respect to each Letter of Credit or Credit Support then outstanding, a standby letter of credit (a
“Supporting Letter of Credit”) in form and substance satisfactory to the Agent, issued by an issuer satisfactory to the Agent in an amount equal to the greatest amount for which such Letter of Credit or such Credit Support
may be drawn plus any fees and expenses associated with such Letter of Credit or such Credit Support, under which Supporting Letter of Credit the Agent is entitled to draw amounts necessary to reimburse the Agent and the Lenders for payments to be
made by the Agent and the Lenders under such Letter of Credit or Credit Support and any fees and expenses associated with such Letter of Credit or Credit Support. Such Supporting Letter of Credit shall be held by the Agent, for the ratable benefit
of the Agent and the Lenders, as security for, and to provide for the payment of, the aggregate undrawn amount of such Letters of Credit or such Credit Support remaining outstanding. In the event Supporting Letters of Credit are not delivered, then
the Loan Parties shall provide cash collateral for all remaining Letters of Credit in an amount equal to 110% of the aggregate face amount of such Letters of Credit. (ii) If a Defaulting Lender exists, the Borrowers shall, on demand by any
Letter of Credit Issuer or the Agent from time to time, cash collateralize the Pro Rata Share of any Defaulting Lender of the Letter of Credit Obligations. 

(h) Auto-Reinstatement Letters of Credit. The Lenders acknowledge that the Letter of Credit issued by the Bank in
connection with the IRBs (as amended, renewed, replaced, and extended from time to time, the “IRB L/C”) permits the automatic reinstatement of all or a portion of the stated amount thereof after any drawing thereunder. Unless
otherwise directed by the Bank, no Borrower shall be required to make a specific request to the Bank to permit such reinstatement. The Lenders shall be deemed to have authorized (but may not require) the Bank to reinstate all or a portion of the
stated amount thereof in accordance with the provisions of the IRB L/C. 

  
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 (i) Additional Letter of Credit Issuers. The Borrowers and all Additional
Letter of Credit Issuers shall comply with all terms and conditions relating to Letters of Credit set forth in this Agreement, including without limitation, Section 1.3(d)(i) above. Each Additional Letter of Credit Issuer shall
promptly provide to the Agent a copy of all original Letters of Credit issued by such Additional Letter of Credit Issuer, and all renewals, extensions, amendments, modifications, cancellations, or draws thereof. Each Additional Letter of Credit
Issuer shall only issue a Letter of Credit in accordance with this Section 1.3. 
 (j) Resignation of
Letter of Credit Issuer. Any Letter of Credit Issuer may resign at any time upon notice to the Agent and the Borrowers. On the effective date of such resignation, such Letter of Credit Issuer shall have no further obligation to issue, amend,
renew, extend or otherwise modify any Letter of Credit, but shall continue to have all rights and obligations of a Letter of Credit Issuer hereunder, including under Sections 1.3 and 13.11, relating to any Letter of
Credit issued prior to such date. The Agent shall promptly appoint a replacement Letter of Credit Issuer, which, as long as no Default or Event of Default exists, shall be reasonably acceptable to Borrowers. 

1.4 Bank Products. The Loan Parties and their Affiliates (including Westlake Veba Trust) may request and the Agent or Lenders may, in
their sole and absolute discretion, arrange for the Loan Parties and their Affiliates (including Westlake Veba Trust) to obtain from the Bank or the Bank’s Affiliates or the Lenders or the Lenders’ Affiliates, Bank Products, although the
Loan Parties and their Affiliates (including Westlake Veba Trust) are not required to do so. If Bank Products are provided by an Affiliate of the Bank, any Lender or an Affiliate of a Lender, the Loan Parties agree to indemnify and hold the Agent,
the Bank, the Lenders, and their respective Affiliates harmless from any and all costs and obligations now or hereafter incurred by the Agent, the Bank, or any of the Lenders and their respective Affiliates which arise from any indemnity given by
the Agent, its Affiliates, or the Lenders or their respective Affiliates related to such Bank Products; provided, however, nothing contained herein is intended to limit any Loan Party’s rights, with respect to the Bank, any Lender
or their respective Affiliates, as the case may be, which relate to the Bank Products or the provision of the Bank Products pursuant thereto. The agreement contained in this Section shall survive termination of this Agreement. Each
Loan Party acknowledges and agrees that the obtaining of Bank Products from the Bank, any Lender or their respective Affiliates (a) is in the sole and absolute discretion of the Bank, any Lender, or their respective Affiliates, and (b) is
subject to all rules and regulations of the Bank, any Lender, or their respective Affiliates. 
 ARTICLE 2. 

INTEREST AND FEES 
 2.1
Interest. 
 (a) Interest Rates. All outstanding Revolving Loans shall bear interest on the unpaid principal
amount thereof (including, to the extent permitted by law, on interest thereon not paid when due) from the date made until paid in full in cash at a rate determined by reference to the Base Rate or the LIBOR Rate plus the Applicable Margin, but not
to exceed the Maximum Rate. If at any time Revolving Loans are outstanding with respect to which the Borrowers have not delivered to the Agent a notice specifying the basis for determining the interest rate applicable thereto in accordance herewith,
those Revolving Loans shall bear interest at a rate determined by reference to the Base Rate (unless the Default Rate has been effected by the Agent and the Required Lenders pursuant to Section 2.1(b)) until notice to the contrary
has been given to the Agent in accordance with this Agreement and such notice has become effective. Except as otherwise provided herein, the outstanding Revolving Loans shall bear interest as follows: 

(i) For all Base Rate Loans at a fluctuating per annum rate equal to the Base Rate plus the Applicable Margin; and 

  
 10 

 (ii) For all LIBOR Rate Loans at a per annum rate equal to the LIBOR Rate plus
the Applicable Margin. 
 Each change in the Base Rate shall be reflected in the interest rate applicable to Base Rate Loans as of the effective date of
such change. All interest charges for LIBOR Rate Loans shall be computed on the basis of a year of 360 days and actual days elapsed (which results in more interest being paid than if computed on the basis of a 365-day year). All interest charges for
Base Rate Loans shall be computed on the basis of a year of 365 or 366 days, as the case may be, and for actual days elapsed. The Borrowers shall pay to the Agent, for the ratable benefit of Lenders, interest accrued on all Base Rate Loans in
arrears on the first day of each month hereafter and on the Termination Date. The Borrowers shall pay to the Agent, for the ratable benefit of Lenders, interest on all LIBOR Rate Loans in arrears on each LIBOR Interest Payment Date. The Agent does
not warrant or accept responsibility for, nor shall it have any liability with respect to, administration, submission or any other matter related to any rate described in the definition of LIBOR Rate. 

(b) Default Rate. If any Event of Default occurs and is continuing and the Agent or the Required Lenders in their
discretion so elect, then, while any such Event of Default is continuing, (i) the principal amount of all Revolving Loans shall bear interest at the Default Rate applicable thereto; (ii) the Letter of Credit Fee shall bear interest at the
Default Rate applicable thereto; and (iii) any other amount (other than principal of any Revolving Loan and the Letter of Credit Fee) payable by the Borrowers under any Loan Document shall bear interest at the Default Rate applicable to Base
Rate Loans. 
 2.2 Continuation and Conversion Elections. 

(a) The Borrowers may: 

(i) elect, as of any Business Day, in the case of Base Rate Loans, to convert any Base Rate Loans (or any part thereof in an
amount not less than $5,000,000, or that is in an integral multiple of $1,000,000 in excess thereof) into LIBOR Rate Loans; or 

(ii) elect, as of the last day of the applicable Interest Period, to continue any LIBOR Rate Loans having Interest Periods
expiring on such day (or any part thereof in an amount not less than $1,000,000, or that is in an integral multiple of $1,000,000 in excess thereof); 

provided, that if at any time the aggregate amount of LIBOR Rate Loans in respect of any Borrowing is reduced, by payment, prepayment, or conversion of
part thereof to be less than $1,000,000, such LIBOR Rate Loans shall automatically convert into Base Rate Loans; provided further that if the notice shall fail to specify the duration of the Interest Period, such Interest Period shall be one
(1) month. 
 (b) Westlake, on its behalf and as agent for the other Borrowers, shall deliver a notice of
continuation/conversion (“Notice of Continuation/Conversion”) to the Agent not later than 12:00 noon (Houston, Texas time) at least three (3) Business Days in advance of the Continuation/Conversion Date, if the Revolving
Loans are to be converted into or continued as LIBOR Rate Loans and specifying: 
 (i) the proposed Continuation/Conversion
Date; 

  
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 (ii) the aggregate amount of Loans to be converted or continued; 

(iii) the type of Loans resulting from the proposed conversion or continuation; and 

(iv) the duration of the requested Interest Period, provided, however, the Borrowers may not select an Interest
Period that ends after the Stated Termination Date. 
 (c) If upon the expiration of any Interest Period applicable to LIBOR
Rate Loans, the Borrowers have failed to select timely a new Interest Period to be applicable to LIBOR Rate Loans, the Borrowers shall be deemed to have elected to convert such LIBOR Rate Loans into Base Rate Loans effective as of the expiration
date of such Interest Period. 
 (d) The Agent will promptly notify each Lender of its receipt of a Notice of
Continuation/Conversion. All conversions and continuations shall be made ratably according to the respective outstanding principal amounts of the Revolving Loans with respect to which the notice was given held by each Lender. 

(e) There may not be more than twelve (12) different LIBOR Rate Loans in effect hereunder at any time. 

2.3 Maximum Interest Rate. In no event shall any interest rate provided for hereunder (including any fees or other fees or other
compensation which are deemed or determined to be interest) exceed the maximum rate legally chargeable by any Lender under applicable law for such Lender with respect to loans of the type provided for hereunder (the “Maximum
Rate”). If, for any period, any interest, absent such limitation, would have exceeded the Maximum Rate, then the interest rate for that period shall be the Maximum Rate, and, if in future periods, that interest rate would otherwise be
less than the Maximum Rate, then that interest rate shall remain at the Maximum Rate until such time as the amount of interest paid hereunder equals the amount of interest which would have been paid if the same had not been limited by the Maximum
Rate. In the event that, upon payment in full of the Obligations, the total amount of interest paid or accrued under the terms of this Agreement is less than the total amount of interest which would, but for this Section 2.3, have
been paid or accrued if the interest rate otherwise set forth in this Agreement had at all times been in effect, then the Borrowers shall, to the extent permitted by applicable law, pay the Agent, for the account of the Lenders, an amount equal to
the excess of (a) the lesser of (i) the amount of interest which would have been charged if the Maximum Rate had, at all times, been in effect or (ii) the amount of interest which would have accrued had the interest rate otherwise set
forth in this Agreement, at all times, been in effect over (b) the amount of interest actually paid or accrued under this Agreement. If a court of competent jurisdiction determines that the Agent and/or any Lender has received interest and
other charges hereunder in excess of the Maximum Rate, such excess shall be deemed received on account of, and shall automatically be applied to reduce, the Obligations other than interest, in the inverse order of maturity, and if there are no
Obligations outstanding, the Agent and/or such Lender shall refund to the Borrowers such excess. 
 2.4 Closing Fee. Borrowers shall
pay the Agent for its account the fees described in the Fee Letter (the “Closing Fee”). 
 2.5 Unused Line
Fee. On the first day of each month hereafter and on the Termination Date, the Borrowers agree to pay to the Agent, for the account of the Lenders, in accordance with their respective Pro Rata Shares, an unused line fee (the
“Unused Line Fee”) equal to the Applicable Margin for Unused Line Fee times the amount by which the Maximum Revolver Amount exceeded the sum of the average daily outstanding principal amount
of Revolving Loans and the average daily undrawn face 

  
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amount of outstanding Letters of Credit, during the immediately preceding month or shorter period if calculated for the first month hereafter or on the Termination Date. The Unused Line Fee shall
be computed on the basis of a 360-day year for the actual number of days elapsed. All principal payments received by the Agent shall be deemed to be credited to the Borrowers’ Loan Account immediately upon receipt for purposes of calculating
the Unused Line Fee pursuant to this Section 2.5. 
 2.6 Letter of Credit Fee. The Borrowers agree to pay
(a) to the Agent, for the account of the Lenders, in accordance with their respective Pro Rata Shares, for each Letter of Credit, a per annum fee (the “Letter of Credit Fee”) equal to the Applicable Margin for LIBOR Rate
Loans multiplied by the stated amount of each Letter of Credit, (b) on the date of issuance of any Letter of Credit, to the Agent for the benefit of the applicable Letter of Credit Issuer, a fronting fee of one-eighth of one percent (0.125%)
per annum of the undrawn face amount of each Letter of Credit, and (c) on the date of issuance of any Letter of Credit, to the applicable Letter of Credit Issuer, all out-of-pocket costs, fees and expenses incurred by such Letter of Credit
Issuer in connection with the application for, processing of, issuance of, or amendment to any Letter of Credit. The Letter of Credit Fee shall be payable monthly in arrears on the first day of each month following any month in which a Letter of
Credit is outstanding and on the Termination Date. The Letter of Credit Fee shall be computed on the basis of a 360-day year for the actual number of days elapsed. 

ARTICLE 3. 
 PAYMENTS AND
PREPAYMENTS 
 3.1 Revolving Loans. The Borrowers shall repay the outstanding principal balance of the Revolving Loans, plus all
accrued but unpaid interest thereon, on the Termination Date. The Borrowers may prepay Revolving Loans at any time, and reborrow subject to the terms of this Agreement. In addition, and without limiting the generality of the foregoing, upon demand,
the Borrowers shall pay to the Agent, for account of the Lenders, the amount, without duplication, by which the Aggregate Revolver Outstandings exceeds the lesser of the Borrowing Base or the Maximum Revolver Amount. 

3.2 Full or Partial Termination of Facility. 

(a) Termination of Facility. The Borrowers may terminate this Agreement upon at least ten (10) Business Days’
notice (or such shorter period as agreed to by the Agent in its sole discretion) to the Agent, upon Full Payment of all Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive
the termination of this Agreement and are not due and payable at such termination). On the effective date of termination of this Agreement, any Lender may terminate its and its Affiliates’ Bank Products. 

(b) Partial Reduction of Facility. The Borrowers may permanently reduce the Maximum Revolver Amount in increments of
$25,000,000 but in no event shall the Maximum Revolver Amount be less than $300,000,000 (the amount of such reduction, the “Partial Termination Amount”) upon at least ten (10) days’ notice to the Agent, upon the
payment in full of any Revolving Loans, together with accrued interest thereon, to the extent such Revolving Loans exceed the Maximum Revolver Amount (after giving effect to such reduction). Once reduced in accordance with this
Section 3.2(b), the Maximum Revolver Amount may not be increased. 
 3.3 Prepayments of the Loans. 

(a) To the extent set forth in this Section 3.3(a), immediately upon receipt by any Loan Party of proceeds
from the sale of any Collateral (other than sales of Inventory in the 

  
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ordinary course of business), the Borrowers shall prepay the Revolving Loans in an amount equal to 100% of all such proceeds, net of (i) commissions and other reasonable and customary
transaction costs, fees, and expenses properly attributable to such transaction and payable by such Loan Party in connection therewith (in each case, paid to non-Affiliates), (ii) transfer taxes, and (iii) appropriate amounts required to
be reserved (in accordance with GAAP) for post-closing adjustments by any Loan Party in connection with such transaction, against any liabilities retained by any Loan Party after such transaction, which liabilities are associated with the asset or
assets sold (“Net Sale Proceeds”). No payment from the Net Sale Proceeds shall be required hereunder to the extent Availability exceeds the amount of Revolving Loans outstanding on such date of determination. In addition,
100% of the Net Sale Proceeds shall be deducted from the calculation of the Borrowing Base, but such reduction shall not be deemed to be a permanent reduction of the Maximum Revolver Amount. 

(b) Prepayments from the proceeds of all dispositions of Collateral in accordance with Section 3.3(a) shall
be applied as follows: first, to accrued interest with respect to the Revolving Loans, second, to pay the principal of the Revolving Loans, and third to cash collateralize outstanding Letters of Credit. 

3.4 LIBOR Rate Loan Prepayments. In connection with any prepayment, if any LIBOR Rate Loans are prepaid prior to the expiration date of
the Interest Period applicable thereto, the Borrowers shall pay to the Lenders the amounts described in Section 4.5. 

3.5 Payments by the Borrowers. 

(a) All payments to be made by the Borrowers shall be made without set off, recoupment or counterclaim. Except as otherwise
expressly provided herein, all payments by the Borrowers shall be made to the Agent for the account of the Lenders, at the account designated by the Agent and shall be made in Dollars and in immediately available funds, no later than 12:00 noon
(Houston, Texas time) on the date specified herein. Any payment received by the Agent after such time shall be deemed (for purposes of calculating interest only) to have been received on the following Business Day and any applicable interest shall
continue to accrue. 
 (b) Subject to the provisions set forth in the definition of “Interest
Period,” whenever any payment is due on a day other than a Business Day, such payment shall be due on the following Business Day, and such extension of time shall in such case be included in the computation of interest or fees, as the
case may be. 
 (c) Each Loan Party that is a Qualified ECP when its guaranty of or grant of a Lien as security for a Swap
Obligation becomes effective hereby jointly and severally, absolutely, unconditionally and irrevocably undertakes to provide funds or other support to each Specified Obligor with respect to such Swap Obligation as may be needed by such Specified
Obligor from time to time to honor all of its obligations under the Loan Documents in respect of such Swap Obligation (but, in each case, only up to the maximum amount of such liability that can be hereby incurred without rendering such Qualified
ECP's obligations and undertakings under this Section 3.5(c) voidable under any applicable fraudulent transfer or conveyance act). The obligations and undertakings of each Qualified ECP under this Section 3.5(c)
shall remain in full force and effect until Full Payment of all Obligations. Each Loan Party intends this Section 3.5(c) to constitute, and this Section 3.5(c) shall be deemed to constitute, a guarantee of the
obligations of, and a “keepwell, support or other agreement” for the benefit of, each Loan Party for all purposes of the Commodity Exchange Act. 

  
 14 

 3.6 Payments as Revolving Loans. At the election of the Agent, all payments of principal,
interest, reimbursement obligations in connection with Letters of Credit and Credit Support, fees, premiums, reimbursable expenses and other sums payable hereunder, may be paid from the proceeds of Revolving Loans made hereunder. The Borrowers
hereby irrevocably authorize the Agent to charge the Loan Account for the purpose of paying all amounts from time to time due hereunder (without regard to any grace periods hereunder, including, without limitation, Loans that constitute Agent
Advances) and agrees that all such amounts charged shall constitute Revolving Loans (including Non-Ratable Loans and Agent Advances). 
 3.7
Apportionment, Application and Reversal of Payments. Principal and interest payments shall be apportioned ratably among the Lenders (according to the unpaid principal balance of the Revolving Loans to which such payments relate held by each
Lender) and payments of the fees shall, as applicable, be apportioned ratably among the Lenders, except for fees payable solely to the Agent and the Letter of Credit Issuers and except as provided in Section 11.1(b) or
12.14(e). All payments shall be remitted to the Agent and all such payments not relating to principal or interest of specific Loans, or not constituting payment of specific fees, and all proceeds of Accounts or other Collateral
received by the Agent following the occurrence and during the continuation of any Event of Default shall be applied, ratably, subject to the provisions of this Agreement, first, to pay any fees, indemnities, or expense reimbursements then due to the
Agent from the Borrowers (other than any fees, indemnities, or expense reimbursements arising under any Bank Product); second, to pay any fees or expense reimbursements then due to the Lenders from the Borrowers (other than any fees or expense
arising from any Bank Product); third, to pay interest due in respect of all Loans, including Non-Ratable Loans and Agent Advances; fourth, to pay or prepay principal of the Non-Ratable Loans and Agent Advances; fifth, to pay or prepay principal of
the Revolving Loans (other than Non-Ratable Loans and Agent Advances), unpaid reimbursement obligations in respect of Letters of Credit, and Pari Passu Bank Product Obligations; sixth, to pay an amount to the Agent equal to all outstanding Letter of
Credit Obligations to be held as cash collateral for such Obligations; and seventh, to the payment of any other Obligations including any amounts relating to Bank Products due to the Agent, any Lender, or their respective Affiliates by the Borrowers
that are not Pari Passu Bank Product Obligations. Notwithstanding anything to the contrary contained in this Agreement, unless so directed by the Borrowers, or unless an Event of Default has occurred and is continuing, neither the Agent nor any
Lender shall apply any payments which it receives to any LIBOR Rate Loan, except (a) on the expiration date of the Interest Period applicable to any such LIBOR Rate Loan, or (b) in the event, and only to the extent, that there are no
outstanding Base Rate Loans and, in any event, the Borrowers shall pay LIBOR breakage losses in accordance with Section 4.5. To the extent not inconsistent with the express terms of this Agreement, the Agent and the Lenders shall
have the continuing and exclusive right to apply and reverse and reapply any and all such proceeds and payments to any portion of the Obligations. 

3.8 Indemnity for Returned Payments. If after receipt of any payment which is applied to the payment of all or any part of the
Obligations, the Agent, any Lender, the Bank or any Affiliate of the Bank is for any reason compelled to surrender such payment or proceeds to any Person because such payment or application of proceeds is invalidated, declared fraudulent, set aside,
determined to be void or voidable as a preference, impermissible setoff, or a diversion of trust funds, or for any other reason, then the Obligations or part thereof intended to be satisfied shall be revived and continued and this Agreement shall
continue in full force as if such payment or proceeds had not been received by the Agent or such Lender and the Borrowers shall be liable to pay to the Agent and the Lenders, and hereby do indemnify the Agent and the Lenders and hold the Agent and
the Lenders harmless for the amount of such payment or proceeds surrendered. The provisions of this Section 3.8 shall be and remain effective notwithstanding any contrary action which may have been taken by the Agent or any Lender
in reliance upon such payment or application of proceeds, and any such contrary action so taken shall be without prejudice to the Agent’s and the Lenders’ rights under this Agreement and shall be deemed to have been conditioned upon such
payment or application of proceeds having become final and irrevocable. The provisions of this Section 3.8 shall survive the termination of this Agreement. 

  
 15 

 3.9 Agent’s and Lenders’ Books and Records; Monthly Statements. The Agent shall
record the principal amount of the Revolving Loans owing to each Lender, the undrawn face amount of all outstanding Letters of Credit and the aggregate amount of unpaid reimbursement obligations outstanding with respect to the Letters of Credit from
time to time on its books. In addition, each Lender may note the date and amount of each payment or prepayment of principal of such Lender’s Loans in its books and records. Failure by the Agent or any Lender to make such notation shall not
affect the obligations of the Borrowers with respect to the Revolving Loans or the Letters of Credit. Each Borrower agrees that the Agent’s and each Lender’s books and records showing the Obligations and the transactions pursuant to this
Agreement and the other Loan Documents shall be admissible in any action or proceeding arising therefrom, and shall constitute rebuttably presumptive proof thereof, absent manifest error, irrespective of whether any Obligation is also evidenced by a
promissory note or other instrument. The Agent will provide to the Borrowers a monthly statement of Revolving Loans, payments, and other transactions pursuant to this Agreement. Such statement shall be deemed correct, accurate, and binding on the
Borrowers and an account stated (except for reversals and reapplications of payments made as provided in Section 3.7 and corrections of errors discovered by the Agent), unless the Borrowers notify the Agent in writing to the
contrary within thirty (30) days after such statement is received. In the event a timely written notice of objections is given by the Borrowers, only the items to which exception is expressly made will be considered to be disputed by the
Borrowers. 
 ARTICLE 4. 

TAXES, YIELD PROTECTION AND ILLEGALITY 

4.1 Taxes. 

(a) Payments Free of Taxes; Obligation to Withhold; Tax Payment. 

(i) All payments of the Obligations by the Loan Parties shall be made without deduction or withholding for any Taxes, except as
required by Requirement of Law. If Requirement of Law (as determined by an applicable Withholding Agent in its discretion) requires the deduction or withholding of any Tax from any such payment by the Agent or a Loan Party, then the Agent or such
Loan Party shall be entitled to make such deduction or withholding based on information and documentation provided pursuant to Section 4.2. 

(ii) If the Agent or any Loan Party is required by the Code to withhold or deduct any Taxes from any payment, then (i) the
Agent shall timely pay the full amount to be withheld or deducted to the IRS, and (ii) to the extent the withholding or deduction is made on account of Indemnified Taxes, the sum payable by the applicable Loan Party shall be increased as
necessary so that the Recipient receives an amount equal to the sum it would have received had no such withholding or deduction been made. 

(iii) If the Agent or any Loan Party is required by any Requirement of Law other than the Code to withhold or deduct Taxes from
any payment, then (i) the Agent or such Loan Party, to the extent required by Requirement of Law, shall timely pay the full amount to be withheld or deducted to the relevant Governmental Authority, and (ii) to the extent the withholding or
deduction is made on account of Indemnified Taxes, the sum payable by the applicable Loan Party shall be increased as necessary so that the Recipient receives an amount equal to the sum it would have received had no such withholding or deduction
been made. 

  
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 (b) Payment of Other Taxes. Without limiting the foregoing, Borrowers
shall timely pay to the relevant Governmental Authority in accordance with Requirement of Law, or at the Agent's option, timely reimburse the Agent for payment of, any Other Taxes. 

(c) Tax Indemnification. 

(i) Each Borrower shall indemnify and hold harmless, on a joint and several basis, each Recipient against any Indemnified Taxes
(including Indemnified Taxes imposed or asserted on or attributable to amounts payable under this Section) payable or paid by such Recipient or required to be withheld or deducted from a payment to such Recipient, and any penalties,
interest and reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. Each Borrower shall make payment within 10 days
after demand for any amount or liability payable under this Section. A certificate as to the amount of such payment or liability delivered to Borrowers by a Lender or Letter of Credit Issuer (with a copy to the Agent), or by the Agent on its own
behalf or on behalf of any Recipient, shall be conclusive absent manifest error. 
 (ii) Each Lender and Letter of Credit
Issuer shall indemnify and hold harmless, on a several basis, the Agent against any Indemnified Taxes attributable to such Lender or Letter of Credit Issuer (but only to the extent Borrowers have not already paid or reimbursed the Agent therefor and
without limiting Borrowers’ obligation to do so), that are payable or paid by the Agent in connection with any Obligations, and any reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes were
correctly or legally imposed or asserted by the relevant Governmental Authority. Each Lender and Letter of Credit Issuer shall make payment within 10 days after demand for any amount or liability payable under this Section. A
certificate as to the amount of such payment or liability delivered to any Lender or Letter of Credit Issuer by the Agent shall be conclusive absent manifest error. 

(d) Evidence of Payments. If the Agent or a Loan Party pays any Taxes pursuant to this Section, then upon request, the
Agent shall deliver to Westlake or Westlake shall deliver to the Agent, respectively, a copy of a receipt issued by the appropriate Governmental Authority evidencing the payment, a copy of any return required by Requirement of Law to report the
payment, or other evidence of payment reasonably satisfactory to the Agent or Westlake, as applicable. 
 (e) Treatment of Certain
Refunds. Unless required by Requirement of Law, at no time shall the Agent have any obligation to file for or otherwise pursue on behalf of a Lender or Letter of Credit Issuer, nor have any obligation to pay to any Lender or Letter of Credit
Issuer, any refund of Taxes withheld or deducted from funds paid for the account of a Lender or Letter of Credit Issuer. If a Recipient determines in its reasonable discretion that it has received a refund of any Taxes as to which it has been
indemnified by Borrowers or with respect to which a Borrower has paid additional amounts pursuant to this Section, it shall pay Borrowers an amount equal to such refund (but only to the extent of indemnity payments made, or additional amounts paid,
by Borrowers with respect to the Taxes giving rise to such refund), net of all out-of-pocket expenses (including Taxes) incurred by such Recipient, and without interest (other than any interest paid by the relevant Governmental Authority with
respect to such refund), provided that Borrowers agree, upon request by the Recipient, to repay the amount paid over to Borrowers (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) 

  
 17 

 
to the Recipient if the Recipient is required to repay such refund to the Governmental Authority. Notwithstanding anything herein to the contrary, no Recipient shall be required to pay any amount
to Borrowers if such payment would place the Recipient in a less favorable net after-Tax position than it would have been in if the Tax subject to indemnification and giving rise to such refund had not been deducted, withheld or otherwise imposed
and the indemnification payments or additional amounts with respect to such Tax had never been paid. In no event shall the Agent or any Recipient be required to make its tax returns (or any other information relating to its taxes that it deems
confidential) available to any Loan Party or other Person. 
 (f) Survival. Each party’s obligations under Sections
4.1 and 4.2 shall survive the resignation or replacement of the Agent or any assignment of rights by or replacement of a Lender or Letter of Credit Issuer, the termination of the Commitments, and the repayment, satisfaction,
discharge or Full Payment of any Obligations. 
 4.2 Lender Tax Information. 

(a) Status of Lenders. Any Lender that is entitled to an exemption from or reduction of withholding Tax with respect to
payments of Obligations shall deliver to Westlake and the Agent properly completed and executed documentation reasonably requested by Westlake or the Agent as will permit such payments to be made without or at a reduced rate of withholding. In
addition, any Lender, if reasonably requested by Westlake or the Agent, shall promptly deliver such other documentation prescribed by Requirement of Law or reasonably requested by Westlake or the Agent to enable them to determine whether such Lender
is subject to backup withholding or information reporting requirements. Notwithstanding the foregoing, such documentation (other than documentation described in Sections 4.2(b)(i), (ii) and (iv)) shall
not be required if a Lender reasonably believes delivery of the documentation would subject it to any material unreimbursed cost or expense or would materially prejudice its legal or commercial position. 

(b) Documentation. Without limiting the foregoing, if any Borrower is a U.S. Person, 

(i) Any Lender that is a U.S. Person shall deliver to Westlake and the Agent on or prior to the date on which such Lender
becomes a Lender hereunder (and from time to time thereafter upon reasonable request of Westlake or the Agent), executed originals of IRS Form W-9, certifying that such Lender is exempt from U.S. federal backup withholding Tax; 

(ii) Any Foreign Lender shall, to the extent it is legally entitled to do so, deliver to Westlake and the Agent (in such number
of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender hereunder (and from time to time thereafter upon reasonable request of Westlake or the Agent), whichever of the following is
applicable: 
 (A) in the case of a Foreign Lender claiming the benefits of an income tax treaty to which the United States
is a party, (x) with respect to payments of interest under any Loan Document, executed originals of IRS Form W-8BEN (or IRS Form W-8BENE, as applicable) establishing an exemption from or reduction of U.S. federal withholding Tax pursuant to the
“interest” article of such tax treaty, and (y) with respect to other payments under the Loan Documents, IRS Form W-8BEN (or IRS Form W-8BENE, as applicable) establishing an exemption from or reduction of U.S. federal withholding Tax
pursuant to the "business profits" or "other income" article of such tax treaty; 

  
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 (B) executed originals of IRS Form W-8ECI; 

(C) in the case of a Foreign Lender claiming the benefits of the exemption for portfolio interest under Section 881(c) of
the Code, (x) a certificate in form satisfactory to the Agent and Westlake to the effect that such Foreign Lender is not a "bank" within the meaning of Section 881(c)(3)(A) of the Code, a "10 percent shareholder" of a Borrower within the
meaning of Section 881(c)(3)(B) of the Code, or a "controlled foreign corporation" described in Section 881(c)(3)(C) of the Code (“U.S. Tax Compliance Certificate”), and (y) executed originals of IRS Form
W-8BEN (or IRS Form W-8BENE, as applicable); or 
 (D) to the extent a Foreign Lender is not the beneficial owner, executed
originals of IRS Form W-8IMY, accompanied by IRS Form W-8ECI, IRS Form W-8BEN (or IRS Form W-8BENE, as applicable), a U.S. Tax Compliance Certificate in form satisfactory to the Agent and Westlake, IRS Form W-9, and/or other certification documents
from each beneficial owner, as applicable; provided that if the Foreign Lender is a partnership and one or more direct or indirect partners of such Foreign Lender are claiming the portfolio interest exemption, such Foreign Lender may provide
a U.S. Tax Compliance Certificate on behalf of each such direct and indirect partner; 
 (iii) Any Foreign Lender shall, to
the extent it is legally entitled to do so, deliver to Westlake and the Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender hereunder (and from time to time
thereafter upon the reasonable request of Westlake or the Agent), executed originals of any other form prescribed by Requirement of Law as a basis for claiming exemption from or a reduction in U.S. federal withholding Tax, duly completed, together
with such supplementary documentation as may be prescribed by Requirement of Law to permit Westlake or the Agent to determine the withholding or deduction required to be made; and 

(iv) If payment of an Obligation to a Lender would be subject to U.S. federal withholding Tax imposed by FATCA if such Lender
were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Code), such Lender shall deliver to Westlake and the Agent at the time(s) prescribed by law and otherwise
as reasonably requested by Westlake or the Agent such documentation prescribed by Requirement of Law (including Section 1471(b)(3)(C)(i) of the Code) and such additional documentation reasonably requested by Westlake or the Agent as may be
necessary for them to comply with their obligations under FATCA and to determine that such Lender has complied with its obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this
clause (iv), “FATCA” shall include any amendments made to FATCA after the date hereof. 

(d) Redelivery of Documentation. If any form or certification previously delivered by a Lender pursuant to this Section
expires or becomes obsolete or inaccurate in any respect, such Lender shall promptly update the form or certification or notify Westlake and the Agent in writing of its legal inability to do so. 

  
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 4.3 Illegality. 

(a) If any Lender determines that the introduction of any Requirement of Law, or any change in any Requirement of Law, or in
the interpretation or administration of any Requirement of Law, has made it unlawful, or that any central bank or other Governmental Authority has asserted that it is unlawful, for any Lender or its applicable lending office to make LIBOR Rate
Loans, then, on notice thereof by that Lender to the Borrowers through the Agent together with an explanation of the circumstances, any obligation of that Lender to make LIBOR Rate Loans shall be suspended until that Lender notifies the Agent and
the Borrowers that the circumstances giving rise to such determination no longer exist. 
 (b) If a Lender determines that it
is unlawful to maintain any LIBOR Rate Loan, the Borrowers shall, upon its receipt of notice of such fact and demand from such Lender (with a copy to the Agent), prepay in full such LIBOR Rate Loans of that Lender then outstanding, together with
interest accrued thereon and amounts required under Section 4.5, either on the last day of the Interest Period thereof, if that Lender may lawfully continue to maintain such LIBOR Rate Loans to such day, or immediately, if that
Lender may not lawfully continue to maintain such LIBOR Rate Loans and if applicable convert to Base Rate Loans. If the Borrowers are required to so prepay any LIBOR Rate Loans, then concurrently with such prepayment, the Borrowers shall borrow from
the affected Lender, in the amount of such prepayment, a Base Rate Loan. 
 4.4 Increased Costs; Capital Adequacy. 

(a) Change in Law. If any Change in Law shall: 

(i) impose, modify or deem applicable any reserve, liquidity, special deposit, compulsory loan, insurance charge or similar
requirement against assets of, deposits with or for the account of, or credit extended or participated in by, any Lender (except any reserve requirement reflected in calculating LIBOR Rate) or any Letter of Credit Issuer; 

(ii) subject any Recipient to Taxes (other than (i) Indemnified Taxes, (ii) Taxes described in clauses
(b) through (d) of the definition of Excluded Taxes, and (iii) Connection Income Taxes) with respect to any Loan, Letter of Credit, Commitment or other obligations, or its deposits, reserves, other liabilities or
capital attributable thereto; or 
 (iii) impose on any Lender or any Letter of Credit Issuer or the London interbank market
any other condition, cost, or expense affecting any Revolving Loan, Loan Document, Letter of Credit, Credit Support, participation in Letters of Credit or Credit Support, or Commitment; 

and the result thereof shall be to increase the cost to such Lender of making or maintaining any LIBOR Rate Loan or Commitment, or converting
to or continuing any interest option for a Loan, or to increase the cost to such Lender or such Letter of Credit Issuer of participating in, issuing or maintaining any Letter of Credit or Credit Support (or of maintaining its obligation to
participate in or to issue any Letter of Credit), or to reduce the amount of any sum received or receivable by 

  
 20 

 
such Lender or such Letter of Credit Issuer hereunder (whether of principal, interest or any other amount) then, upon request of such Lender or such Letter of Credit Issuer, the Borrowers will,
within ten (10) days of receipt of the certificate delivered by the Agent under Section 4.7, pay to such Lender or such Letter of Credit Issuer, as applicable, such additional amount or amounts as will compensate such Lender
or such Letter of Credit Issuer, as applicable, for such additional costs incurred or reduction suffered. 
 (b) Capital
Adequacy. If any Lender or any Letter of Credit Issuer determines that any Change in Law affecting such Lender or such Letter of Credit Issuer or any Lending Office of such Lender or such Lender’s or such Letter of Credit Issuer’s
holding company, if any, regarding capital or liquidity requirements has or would have the effect of reducing the rate of return on such Lender’s, such Letter of Credit Issuer’s or holding company’s capital as a consequence of this
Agreement, or such Lender’s or such Letter of Credit Issuer’s Commitments, Revolving Loans, Letters of Credit, Credit Support, or participations in Letters of Credit or Credit Support or Loans, to a level below that which such Lender, such
Letter of Credit Issuer or holding company could have achieved but for such Change in Law (taking into consideration such Lender’s, such Letter of Credit Issuer’s and holding company’s policies with respect to capital adequacy), then
from time to time the Borrowers will pay to such Lender or such Letter of Credit Issuer, as the case may be, such additional amount or amounts as will compensate it or its holding company for any such reduction suffered, in each case, within ten
(10) days of receipt of the certificate delivered under Section 4.7. 
 4.5 Funding Losses. If for any reason
(other than default by a Lender) (a) any Borrowing of, or conversion to or continuation of, a LIBOR Rate Loan does not occur on the date specified therefor in a Notice of Borrowing or Notice of Conversion/Continuation (whether or not
withdrawn), (b) any repayment or conversion of a LIBOR Rate Loan occurs on a day other than the end of its Interest Period, (c) the Borrowers fail to repay a LIBOR Rate Loan when required hereunder, or (d) a Lender (other than a
Defaulting Lender) is required to assign a LIBOR Rate Loan prior to the end of its Interest Period pursuant to Section 4.10, then the Borrowers shall, within ten (10) days of receipt of the certificate delivered under
Section 4.7, pay to the Agent its customary administrative charge and to each Lender all losses and expenses that it sustains as a consequence thereof, including any loss or expense arising from liquidation or redeployment of
funds or from fees payable to terminate deposits of matching funds. Lenders shall not be required to purchase Dollar deposits in the London interbank market or any other offshore Dollar market to fund any LIBOR Rate Loan, but the provisions hereof
shall be deemed to apply as if each Lender had purchased such deposits to fund its LIBOR Rate Loans. 
 4.6 Inability to Determine
Rates. The Agent will promptly notify Westlake and Lenders if, in connection with any Loan or request for a Loan, (a) the Agent determines that (i) Dollar deposits are not being offered to banks in the London interbank Eurodollar
market for the applicable Loan amount or Interest Period, or (ii) adequate and reasonable means do not exist for determining LIBOR Rate for the Interest Period; or (b) the Agent or Required Lenders determine for any reason that LIBOR Rate
for the Interest Period does not adequately and fairly reflect the cost to Lenders of funding the Loan. Thereafter, Lenders’ obligations to make or maintain affected LIBOR Rate Loans and utilization of the LIBOR component (if affected) in
determining Base Rate shall be suspended until the Agent (upon instruction by Required Lenders) withdraws the notice. Upon receipt of such notice, Westlake may revoke any pending request for a LIBOR Rate Loan or, failing that, will be deemed to have
requested a Base Rate Loan. 
 4.7 Certificates of the Agent. If any Lender or any Letter of Credit Issuer claims reimbursement or
compensation under this Article 4, the Agent shall determine the amount thereof and shall deliver to the Borrowers (with a copy to the affected Lender) a certificate setting forth in reasonable detail the amount payable to the affected
Lender, and such certificate shall be conclusive and binding on the Borrowers in the absence of manifest error. 

  
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 4.8 Delay in Requests. Failure or delay on the part of any Lender or any Letter of Credit
Issuer to demand compensation pursuant to this Section shall not constitute a waiver of its right to demand such compensation, but the Borrowers shall not be required to compensate a Lender or a Letter of Credit Issuer for any
increased costs incurred or reductions suffered more than nine (9) months prior to the date that a Lender or a Letter of Credit Issuer notifies Westlake of the Change in Law giving rise to such increased costs or reductions and of such
Lender’s or such Letter of Credit Issuer’s intention to claim compensation therefor (except that, if the Change in Law giving rise to such increased costs or reductions is retroactive, then the nine-month period referred to above shall be
extended to include the period of retroactive effect thereof). 
 4.9 Mitigation. If any Lender or any Letter of Credit Issuer gives
a notice under Section 4.3 or requests compensation under Section 4.4, or if the Loan Parties are required to pay any Indemnified Taxes or additional amounts with respect to a Lender under
Section 4.1, then such Lender shall use reasonable efforts to designate a different Lending Office or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the judgment of such
Lender, such designation or assignment (a) would eliminate the need for such notice or reduce amounts payable in the future, as applicable; and (b) in each case, would not subject such Lender to any unreimbursed cost or expense and would
not otherwise be disadvantageous to such Lender. The Borrowers agree to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment. 

4.10 Replacement of Lenders. If any Lender requests compensation under Section 4.4, or if the Borrowers are required
to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 4.1, or if any Lender gives notice under Section 4.3, at the Borrowers’ request,
the Agent or an Eligible Assignee shall have the right (but not the obligation) with the Agent’s approval, to purchase from such Lender, and such Lender agrees that it shall sell, all its Commitments for an amount equal to the principal
balances thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such
Assignment and Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan
Documents, including all principal, interest and fees through the date of assignment (but excluding any prepayment charge). 
 4.11
Survival. The agreements and obligations of the Borrowers in this Article 4 shall survive the payment of all other Obligations. 

ARTICLE 5. 
 BOOKS AND
RECORDS; FINANCIAL INFORMATION; NOTICES 
 5.1 Books and Records. The Loan Parties shall maintain, at all times, correct and
complete books, records and accounts in which entries that are complete, correct and timely in all material respects are made of their respective transactions in accordance with GAAP applied consistently with the audited Financial Statements
required to be delivered pursuant to Section 5.2(a) (it being understood and agreed that certain Foreign Subsidiaries maintain individual books and records in conformity with generally accepted accounting principles in their
respective countries of organization and that such maintenance shall not constitute a breach of the representations, warranties, or covenants hereunder). The Loan Parties shall, by means of appropriate entries, reflect in such accounts and in all
Financial Statements proper liabilities and reserves for all taxes and proper provision for depreciation and amortization of property and 

  
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bad debts, all in accordance with GAAP. The Loan Parties shall maintain at all times books and records pertaining to the Collateral in such detail, form and scope as the Agent shall reasonably
require, including, but not limited to, records of (a) all payments received and all credits and extensions granted with respect to the Accounts; (b) the return, rejection, repossession, stoppage in transit, loss, damage, or destruction of
any Inventory; and (c) all other dealings affecting the Collateral. 
 5.2 Financial Information. The Borrowers shall promptly
furnish to the Agent all such financial information regarding the Loan Parties as the Agent shall reasonably request. Without limiting the foregoing, the Borrowers will furnish to the Agent, in such detail as the Agent or the Lenders shall request
in their reasonable discretion, the following: 
 (a) As soon as available, but in any event not later than ninety
(90) days after the close of each Fiscal Year, consolidated audited and consolidating unaudited balance sheets, and income statements, cash flow statements and changes in stockholders’ equity for Westlake and its Subsidiaries for such
Fiscal Year, and the accompanying notes thereto, setting forth in each case in comparative form figures for the previous Fiscal Year, all in reasonable detail, fairly presenting in all material respects the financial position and the results of
operations of Westlake and its Subsidiaries as at the date thereof and for the Fiscal Year then ended, and prepared in accordance with GAAP. Such statements shall be examined in accordance with generally accepted auditing standards by and, in the
case of such statements performed on a consolidated basis, accompanied by a report of, independent certified public accountants of recognized national standing selected by the Borrowers, which is not qualified with respect to scope limitations
imposed by any Loan Party, with respect to accounting principles followed by any Loan Party not in accordance with GAAP, or with respect to a “going concern” or similar nature. Westlake, simultaneously with retaining such
independent public accountants to conduct such annual audit, shall send a letter to such accountants, with a copy to the Agent and the Lenders, notifying such accountants that one of the primary purposes for retaining such accountants’ services
and having audited financial statements prepared by them is for use by the Agent and the Lenders. The Borrowers hereby authorize the Agent to communicate directly with their certified public accountants and, by this provision, authorizes those
accountants to disclose to the Agent any and all financial statements and other supporting financial documents and schedules relating to the Loan Parties and to discuss directly with the Agent the finances and affairs of the Loan Parties. The Agent
shall give Westlake the opportunity to participate in any discussions with its accountants. 
 (b) As soon as available, but
in any event not later than (i) forty-five (45) days after the last day of the first three fiscal quarters of each Fiscal Year and (ii) sixty (60) days after the last day of the fourth fiscal quarter of each Fiscal Year,
consolidated and consolidating unaudited balance sheets and income statements, and consolidated cash flow statements and changes in stockholders’ equity, for Westlake and its Subsidiaries for such fiscal quarter and for the period from the
beginning of the then-current fiscal year to, such last day. The Borrowers shall certify by a certificate signed by a Responsible Officer of Westlake that all such statements have been prepared in accordance with GAAP and present fairly in all
material respects the financial position of Westlake and its Subsidiaries as at the dates thereof and its results of operations for the periods then ended, subject to normal year-end adjustments and the absence of applicable footnotes. 

(c) [Reserved]. 

(d) Concurrently with the delivery of the consolidated unaudited financial statements of Westlake and its Subsidiaries in
accordance with clause (b) above, the Borrowers will furnish to the Agent reconciled financial statements of Westlake and its Restricted Subsidiaries only. 

  
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 (e) As soon as available, but in any event not later than forty-five
(45) days after the end of each March, June, September and December, a Compliance Certificate in the form of Exhibit G from a Responsible Officer on behalf of the Loan Parties stating that, among other things, except as
explained in reasonable detail in such certificate, (A) all of the representations and warranties of the Loan Parties contained in this Agreement and the other Loan Documents are correct and complete in all material respects as at the date of
such certificate as if made at such time, except for those that speak as of a particular date, (B) the Loan Parties are, at the date of such certificate, in compliance in all material respects with all of its respective covenants and agreements
in this Agreement and the other Loan Documents, and (C) no Default or Event of Default then exists or existed during the period covered by the Financial Statements and at the end of such period, together with a schedule setting forth in
reasonable detail the calculation of the Fixed Charge Coverage Ratio for the immediately preceding twelve (12) month period. If such certificate discloses that a representation or warranty is not correct or complete, or that a covenant has not
been complied with, or that a Default or Event of Default existed or exists, such certificate shall set forth what action the Borrowers have taken or propose to take with respect thereto. 

(f) Within thirty (30) days after the beginning of each Fiscal Year, annual forecasts (to include forecasted consolidated,
as well as consolidating by business segment in accordance with Westlake’s customary practices, balance sheets, income statements and cash flow statements) for Westlake and its Subsidiaries as at the end of and for each fiscal month of such
Fiscal Year. 
 (g) Promptly upon the filing thereof, copies of all reports, if any, or other documents filed by any Loan
Party with the SEC under the Exchange Act, and all reports, notices, or statements sent or received by any Loan Party to or from the holders of any of the Bond Debt or other Debt of any Loan Party registered under the Securities Act of 1933 or to or
from the trustee under any indenture under which the same is issued, other than non-material disclosures; provided that the Loan Parties shall file with the SEC all Material Agreements in accordance with applicable Requirements of Law. 

(h) As soon as available, but in any event not later than fifteen (15) days after any Borrower’s receipt thereof, a
copy of any management letters prepared for any Borrower by any independent certified public accountants of the Borrowers in connection with the audited Financial Statements of the Loan Parties for any Fiscal Year. 

(i) [Reserved]. 

(j) A Borrowing Base Certificate prepared as of the end of each fiscal quarter, to be delivered as soon as available, but in
any event within fifteen (15) days after the end of such fiscal quarter; provided that, if the Average Daily Availability during any month in such fiscal quarter or in the prior fiscal quarter exceeds the greater of: (x) 12.5% of
the Maximum Revolver Amount and (y) $50,000,000 but is less than or equal to the greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000, a Borrowing Base Certificate prepared as of the end of such month and each
subsequent month until all three months in any subsequent fiscal quarter exceeds the greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000, such Borrowing Base Certificate to be delivered as soon as available, but in any
event within fifteen (15) days after the end of each such month; provided further that, if the Average Daily Availability during any month is less than or equal to the greater of (x) 12.5% of the Maximum Revolver Amount and
(y) $50,000,000, a Borrowing Base Certificate prepared as of the end of each subsequent week and until the Average Daily Availability during any subsequent month 

  
 24 

 
exceeds the greater of (x) 12.5% of the Maximum Revolver Amount and (y) $50,000,00, such Borrowing Base Certificate to be delivered as soon as available, but in any event within three
(3) days after the end of each such week. Notwithstanding the foregoing, the Borrowers may deliver a Borrowing Base Certificate more frequently to determine Availability or otherwise. 

(k) (i) a detailed aged trial balance of all Accounts as of the end of each fiscal quarter, specifying each Account’s
Account Debtor name and address, amount, invoice date and due date, showing any discount, allowance, credit, authorized return or dispute, and including such proof of delivery, copies of invoices and invoice registers, copies of related documents,
repayment histories, status reports and other information as the Agent may reasonably request, and (ii) an inventory and reconciliation reports in form satisfactory to the Agent, in each case to be delivered as soon as available after such
fiscal quarter end, but in any event within fifteen (15) days after the end of such fiscal quarter; provided that, if the Average Daily Availability for any month in such fiscal quarter or the prior fiscal quarter does not exceed the
greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000, the reports and other information required to be delivered pursuant to this Section 5.2(k) shall be prepared as of the end of each month until the
Average Daily Availability for all three months in any subsequent fiscal quarter exceeds the greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000, such reports and other information to be delivered not later than fifteen
(15) days after the end of each such month. 
 (l) At the request of the Agent and the expense of the Borrowers,
Inventory appraisals to be performed by an appraisal company acceptable to the Agent; provided that (i) no Inventory appraisal shall be required for any year in which the Availability exceeds the greater of (x) 80% of the Maximum
Revolver Amount and (y) $320,000,000 at all times during such period, provided that Availability may be less than or equal to the foregoing amount for no more than five (5) consecutive Business Days if it is more than the greater of
(x) 75% of the Maximum Revolver Amount and (y) $300,000,000 at all times during such period; (ii) two (2) Inventory appraisals shall be required for each year in which the Availability is less than or equal to the greater of
(x) 20% of the Maximum Revolver Amount and (y) $80,000,000 for more than five (5) consecutive Business Days during such period, or is less than the greater of (x) 15% of the Maximum Revolver Amount and (y) $60 million at any
time during such period; and (iii) one (1) Inventory appraisal shall be required for any other year; provided that the Agent may request Inventory appraisals to be performed at any time a Default or an Event of Default exists. 

(m) Such additional information (including, without limitation, copies of any Material Agreement) as the Agent and/or any
Lender may from time to time reasonably request regarding the financial and business affairs of Westlake or any of its Subsidiaries. 

(n) Documents required to be delivered pursuant to Section 5.2(a), (b) or
(g) (to the extent any such documents are included in materials otherwise filed with the SEC) may be delivered electronically and if so delivered, shall be deemed to have been delivered on the date (i) on which the Borrowers
post such documents, or provide a link thereto on Westlake’s website on the Internet at the website address www.westlake.com; or (ii) on which such documents are posted on the Borrowers’ behalf on an Internet or intranet website, if
any, to which each Lender and the Agent have access (whether a commercial, third-party website or whether sponsored by the Agent); provided that: (i) the Borrowers shall deliver paper copies of such documents to the Agent or any Lender
that requests the Borrowers to deliver such paper copies until a written request to cease delivering paper copies is given by the Agent or such Lender and (ii) in the case of Westlake’s 10-K and 10-Q, Westlake shall notify the Agent (by
telecopier or electronic mail) of the posting of any such documents and, if requested, provide to the Agent by electronic mail electronic versions (i.e., soft copies) of such documents. The Agent shall have no obligation to

  
 25 

 
request the delivery or to maintain copies of the documents referred to above, and in any event shall have no responsibility to monitor compliance by the Borrowers with any such request for
delivery, and each Lender shall be solely responsible for requesting delivery to it or maintaining its copies of such documents. 
 The
Borrowers hereby acknowledge that the Agent and/or the Arranger will make available to the Lenders and the Letter of Credit Issuers materials and/or information provided by or on behalf of the Borrowers hereunder (collectively, “Borrower
Materials”) by posting the Borrower Materials on IntraLinks or another similar electronic system. The Agent agrees to use its best efforts in accordance with its standard business practices to post the Borrower Materials to IntraLinks
or another similar electronic system. The Agent shall have no liability to the Lenders or the Borrowers for any failure to post the Borrower Materials to IntraLinks or another similar electronic system. 

5.3 Notices to the Agent. The Borrowers shall notify the Agent in writing of the following matters at the following times: 

(a) Promptly after any Responsible Officer of any Loan Party becoming aware of any Default or Event of Default; 

(b) Promptly after any Responsible Officer of any Loan Party becoming aware of the assertion by the holder of any capital stock
of any Loan Party or the holder of any Debt of any Loan Party in a face amount in excess of $20,000,000 that a default exists with respect thereto or that such Loan Party is not in compliance with the terms thereof, or the threat or commencement by
such holder of any enforcement action because of such asserted default or non-compliance; 
 (c) Promptly after any
Responsible Officer of any Loan Party becoming aware of any event or circumstance which could reasonably be expected to have a Material Adverse Effect; 

(d) Promptly after any Responsible Officer of any Loan Party becoming aware of any pending or threatened action, suit, or
proceeding, by any Person, or any pending or threatened investigation by a Governmental Authority, which could reasonably be expected to have a Material Adverse Effect; 

(e) Promptly after any Responsible Officer of any Loan Party becoming aware of any pending or threatened strike, work stoppage,
unfair labor practice claim, or other labor dispute affecting the any Loan Party in a manner which could reasonably be expected to have a Material Adverse Effect; 

(f) Promptly after any Responsible Officer of any Loan Party becoming aware of any violation of any law, statute, regulation,
or ordinance of a Governmental Authority affecting any Loan Party which could reasonably be expected to have a Material Adverse Effect; 

(g) Promptly after receipt by a Responsible Officer of any Loan Party of (i) any notice of any violation by any Loan Party
of any Environmental Law or (ii) any writing from any Governmental Authority asserting that (x) any Loan Party is not in compliance with any Environmental Law or (y) any Loan Party is being investigated for its compliance with the
Environmental Law, provided that any such violation, noncompliance or investigation could reasonably be expected to have a Material Adverse Effect; 

  
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 (h) Promptly after receipt by any Responsible Officer of any Loan Party of any
written notice that the any Loan Party is or may be liable to any Person as a result of the Release or threatened Release of any Contaminant or that any Loan Party is subject to investigation by any Governmental Authority evaluating whether any
remedial action is needed to respond to the Release or threatened Release of any Contaminant which, in either case, is reasonably likely to give rise to liability in excess of $20,000,000; 

(i) Promptly after receipt by a Responsible Officer of any Loan Party of any written notice of the imposition of any
Environmental Lien against any property of any Loan Party securing an amount which could reasonably be expected to exceed $20,000,000; 

(j) (i) Any change in any Loan Party’s name as it appears in the state of its incorporation or other organization,
state of incorporation or organization, type of entity, organizational identification number, form of organization, trade names under which any Loan Party will sell Inventory or create Accounts, or to which instruments in payment of Accounts may be
made payable, in each case at least thirty (30) days prior thereto (or such shorter period as agreed to by the Agent in its sole discretion); and (ii) any additional manufacturing facility, warehouse, storage facility, or customer or
vendor locations where Collateral is located (other than Collateral in transit), which information shall be updated monthly or quarterly, as applicable, and included in the monthly or quarterly reports, as applicable, prescribed in
Section 5.2(k); 
 (k) Within ten (10) Business Days after a Responsible Officer of any Loan Party or
any ERISA Affiliate knows or has reason to know, that an ERISA Event, or a prohibited transaction (as defined in Sections 406 of ERISA and 4975 of the Code), which could reasonably be expected to result in liability to any Loan Party in excess
of $15,000,000 has occurred, and, when known, any action taken or threatened by the IRS, the DOL, or the PBGC with respect thereto; 

(l) Promptly after request, or, in the event that such filing reflects a potentially adverse significant financial change with
respect to the matters covered thereby, within ten (10) Business Days after the filing thereof with the PBGC, the DOL, or the IRS, as applicable, copies of the following: (i) each annual report (form 5500 series), including
Schedule B thereto, filed with the PBGC, the DOL, or the IRS with respect to each Plan, (ii) a copy of each funding waiver request filed with the PBGC, the DOL, or the IRS with respect to any Plan and all communications
received by any Loan Party or any ERISA Affiliate from the PBGC, the DOL, or the IRS with respect to such request, and (iii) a copy of each other filing or notice filed with the PBGC, the DOL, or the IRS, with respect to each Plan by either any
Loan Party or any ERISA Affiliate; 
 (m) Promptly after request, copies of each actuarial report for any Plan or
Multi-employer Plan and annual report for any Multi-employer Plan; and within ten (10) Business Days after receipt thereof by any Loan Party or any ERISA Affiliate, copies of the following: (i) any notices of the PBGC’s intention to
terminate a Plan or to have a trustee appointed to administer such Plan; (ii) any unfavorable determination letter from the IRS regarding the qualification of a Plan under Section 401(a) of the Code; or (iii) any notice from a
Multi-employer Plan regarding the imposition of withdrawal liability to any Loan Party in excess of $15,000,000; 
 (n)
Within ten (10) Business Days after the occurrence of any failure by any Loan Party or any ERISA Affiliate to make a required installment or any other required payment under Section 412 of the Code on or before the due date for such
installment or payment; 

  
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 (o) Within ten (10) Business Days after any Responsible Officer of any Loan
Party or any ERISA Affiliate knows or has reason to know that any of the following events has or will occur which could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000: (i) a Multi-employer Plan has been
or will be terminated; (ii) the administrator or plan sponsor of a Multi-employer Plan intends to terminate a Multi-employer Plan; or (iii) the PBGC has instituted or will institute proceedings under Section 4042 of ERISA to terminate
a Multi-employer Plan; 
 (p) Promptly after the Borrowers have notified the Agent of any intention by the Borrowers to treat
the Revolving Loans and/or Letters of Credit and related transactions as being a “reportable transaction” (within the meaning of Treasury Regulation Section 1.6011-4), a duly completed copy of IRS Form 8886 or any successor
form; or 
 (q) Within ten (10) Business Days after any Responsible Officer of any Loan Party knows or has reason to
know that any Liens for taxes or statutory Liens for taxes, assessments and other governmental charges, in an amount exceeding $5,000,000, may be imposed or assessed against its property, notices of such Liens and the details thereof. 

Each notice given under this Section 5.3 shall describe the subject matter thereof in reasonable detail, and shall set
forth the action that the Loan Party, its Restricted Subsidiary, or any ERISA Affiliate, as applicable, has taken or proposes to take with respect thereto. 

ARTICLE 6. 
 GENERAL
WARRANTIES AND REPRESENTATIONS 
 Each Borrower (and each other Loan Party by executing an Obligation Guaranty, with respect to such
Loan Party) warrants and represents to the Agent and the Lenders that except as hereafter disclosed to and accepted by the Agent and the Required Lenders in writing: 

6.1 Authorization, Validity, and Enforceability of this Agreement and the Loan Documents. Each Loan Party has the power and authority
to execute, deliver, and perform this Agreement and the other Loan Documents to which it is a party, to incur the Obligations, and to grant to the Agent’s Liens upon and security interests in the Collateral. Each Loan Party has taken all
necessary action (including obtaining approval of its stockholders if necessary) to authorize its execution, delivery, and performance of this Agreement and the other Loan Documents to which it is a party. This Agreement and the other Loan Documents
to which it is a party have been duly executed and delivered by each Loan Party, and constitute the legal, valid, and binding obligations of each Loan Party, enforceable against each such Loan Party in accordance with their respective terms except
as enforceability may be limited by the Federal Bankruptcy Code or by any other state or federal bankruptcy or insolvency act or law and general principles of equity. Each Loan Party’s execution, delivery, and performance of this Agreement and
the other Loan Documents to which it is a party do not and will not conflict with, or constitute a violation or breach of, or result in the imposition of any Lien (other than in favor of the Agent) upon the property of such Loan Party or any of its
Subsidiaries, by reason of the terms of (a) any contract, mortgage, lease, material agreement, indenture, or instrument to which such Loan Party is a party or which is binding upon it, (b) any Requirement of Law applicable to such Loan
Party or any of its Subsidiaries, or (c) the certificate or articles of incorporation or by-laws or the limited liability company or limited partnership agreement of such Loan Party or any of its Restricted Subsidiaries. The Obligations under
the Loan Documents are permitted by the applicable supplemental indenture for each Bond Debt. 
 6.2 Validity and Priority of Security
Interest. The provisions of this Agreement, the Collateral Documents, and the other Loan Documents create legal and valid Liens on all the Collateral in favor of the Agent, for the ratable benefit of the Agent and the Lenders, and, upon the
filing of all applicable financing statements against the Loan Parties, such Liens shall constitute perfected and 

  
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continuing Liens on all the Collateral, having priority over all other Liens on the Collateral, except for those Liens identified in clauses (a) and (d) of
the definition of Permitted Liens securing all the Obligations, and enforceable against each Loan Party and all third parties. 
 6.3
Organization and Qualification. Each Loan Party (a) is duly organized or incorporated and validly existing in good standing under the laws of the state of its organization or incorporation, (b) is qualified to do business and is in
good standing in the jurisdictions in which qualification is necessary in order for it to own or lease its property and conduct its business, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse
Effect, and (c) has all requisite power and authority to conduct its business and to own its property. 
 6.4 Corporate Name; Prior
Transactions. Except as set forth on Schedule 6.4 or as otherwise notified by Westlake to the Agent, no Loan Party has, during the past five (5) years, been known by or used any other corporate or fictitious name, or been
a party to any merger or consolidation, or acquired all or substantially all of the assets of any Person, or acquired any of its property outside of the ordinary course of business. 

6.5 Subsidiaries and Affiliates. Except as otherwise notified by Westlake to the Agent, Schedule 6.5 is a correct
and complete list of the name and relationship to each Loan Party of each and all of its Subsidiaries and other Affiliates owned, directly or indirectly, by Westlake. No Loan Party has any direct ownership interest in any Subsidiary of any
Unrestricted Subsidiary of Westlake, other than ownership in Westlake Chemical OpCo LP and Westlake Chemical Partners LP. In addition, Schedule 6.5 sets forth, as of the date hereof, all Restricted Subsidiaries that are not Loan
Parties, all Material Subsidiaries, all Excluded Subsidiaries and all Unrestricted Subsidiaries. 
 6.6 Financial Statements and
Projections. 
 (a) The Borrowers have delivered to the Agent and the Lenders the audited balance sheet and related
statements of income, retained earnings, cash flows, and changes in stockholders equity for the Loan Parties as of December 31, 2013, accompanied by the report thereon of the Borrowers’ independent certified public accountants,
PricewaterhouseCoopers LLP. The Borrowers have also delivered to the Agent and the Lenders the unaudited balance sheet and related statements of income and cash flows for the Loan Parties as of March 31, 2014. All such Financial Statements have
been prepared in accordance with GAAP and fairly present in all material respects the financial position of the Loan Parties as at the dates thereof and their results of operations for the periods then ended, subject to normal year-end adjustments
as to the March 31, 2014 statements, and the absence of applicable footnotes. 
 (b) The Latest Projections when
submitted to the Lenders as required herein represent the Borrowers’ good faith estimate of the future financial performance of the Loan Parties for the periods set forth therein. The Latest Projections have been prepared on the basis of the
assumptions set forth therein, which the Borrowers believe are fair and reasonable in light of current and reasonably foreseeable business conditions at the time submitted to the Lenders. 

6.7 Solvency. On the Closing Date, at the time of each Borrowing hereunder, and on the dates of the issuance of any Letters of Credit
to be issued hereunder, each Loan Party is (and after giving effect to the transactions contemplated by the Loan Documents, and any incurrence of additional Debt will be) Solvent. 

  
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 6.8 Real Estate; Leases. Except as terminated or expired in accordance with its terms,
(a) each of the leases and subleases of real or personal property held by any Loan Party as lessee or sublessee (other than leases of personal property as to which any Loan Party is lessee or sublessee for which the value of such personal
property in the aggregate is less than $5,000,000) is valid and enforceable in accordance with its terms against the Loan Party thereof which is a party thereto and is in full force and effect, and to the best of each Loan Party’s knowledge, no
default by any party to any such lease or sublease exists; and (b) each of the leases and subleases of real or personal property held by any Loan Party as lessor, or sublessor is valid and enforceable in accordance with its terms against the
Loan Party thereof which is a party thereto and is in full force and effect, and to the best of each Loan Party’s knowledge, no default by any party to any such lease or sublease exists, except in the case of clauses (a) and
(b), where such default or non-enforceability could not reasonably be expected to (i) have a Material Adverse Effect or (ii) affect the Agent’s access to any Collateral. Each Loan Party has good and indefeasible title in
fee simple to the Real Estate as owned by such Loan Party, or valid leasehold interests in all Real Estate leased by such Loan Party and each Loan Party has good and indefeasible title to all of its other property reflected on the March 31,
2014 Financial Statements delivered to the Agent and the Lenders, except as disposed of in compliance with Section 7.9 and except where failure to have such title could not reasonably be expected to (i) have a Material
Adverse Effect or (ii) affect the Agent’s access to any Collateral, free of all Liens except Permitted Liens. 
 6.9
Proprietary Rights. Schedule 6.9 sets forth a correct and complete list of all of the Proprietary Rights of each Loan Party as of the Closing Date. None of the Proprietary Rights is subject to any licensing agreement or
similar arrangement except those which could not reasonably be expected to have a Material Adverse Effect. To the best of each Loan Party’s knowledge, none of the Proprietary Rights of such Loan Party infringes on or conflicts with any other
Person’s property, and no other Person’s property infringes on or conflicts with the Proprietary Rights of such Loan Party, except for any such infringement or conflict which could not reasonably be expected to (a) have a Material
Adverse Effect, (b) impair any Proprietary Rights constituting Collateral, or (c) adversely affects the Agent’s enforcement of its rights in any Collateral. The Proprietary Rights described on Schedule 6.9
constitute all of the property of such type necessary to the current conduct of the business of each such Loan Party as of the Closing Date. No Proprietary Rights are necessary for the Agent to be able to enforce the Agent’s Liens granted in
any Collateral Document in any Inventory or Accounts. 
 6.10 Trade Names. All trade names or styles under which any Loan Party or
any of their Restricted Subsidiaries will sell Inventory or create Accounts, or to which instruments in payment of Accounts may be made payable, as of the Closing Date, are listed on Schedule 6.10. 

6.11 Litigation. Except as set forth on Schedule 6.11, there is no pending, or to the best of any Loan Party’s
knowledge threatened, action, suit, proceeding, or counterclaim by any Person against any Loan Party, or to the best of any Loan Party’s knowledge, investigation by any Governmental Authority, or any basis for any of the foregoing, which could
reasonably be expected to have a Material Adverse Effect. 
 6.12 Labor Disputes. Except as set forth on
Schedule 6.12, as of the Closing Date (a) there is no collective bargaining agreement or other labor contract covering employees of any Loan Party or any of their Restricted Subsidiaries, (b) no such collective
bargaining agreement or other labor contract is scheduled to expire during the term of this Agreement, (c) to the best of each Loan Party’s knowledge, no union or other labor organization is seeking to organize, or to be recognized as, a
collective bargaining unit of employees of any Loan Party or any of their Restricted Subsidiaries or for any similar purpose, and (d) there is no pending or (to the best of any Loan Party’s knowledge) threatened, strike, work stoppage,
material unfair labor practice claim, or other material labor dispute against or affecting any Loan Party or their Restricted Subsidiaries or their employees. 

  
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 6.13 Environmental Laws. Except as otherwise disclosed on Schedule 6.13
or except as could not reasonably be expected to have a Material Adverse Effect: 
 (a) The Loan Parties and their
Subsidiaries are and have been in compliance with all Environmental Laws. 
 (b) Each of the Loan Parties and their
Subsidiaries have obtained, and have timely filed any renewal applications for, all permits necessary for its current operations under Environmental Laws, and each Loan Party and its Subsidiaries are in compliance with all terms and conditions of
such permits, or, when applicable, such applications. 
 (c) There has been no Release, nor to the best of any Loan
Party’s knowledge, any threatened Release, that has resulted in or that could result in: (i) a violation of or obligation under any Environmental Law, including without limitation, notification, deed recordation, or remediation, or
(ii) a diminution in value of the Real Estate. The Real Estate has not contained and currently does not contain any underground storage tanks, any polychlorinated biphenyls (PCBs), or any asbestos. 

(d) The Loan Parties and their Subsidiaries have not given, nor were they required to give, and have not received, any notice
that: (i) the Loan Parties and their Subsidiaries have violated, or are about to violate, any Environmental Law; (ii) there has been a Release, or there is a threat of Release, from the Real Estate; (iii) the Loan Parties and their
Subsidiaries may be or are liable, in whole or in part, for the costs of cleaning up, remediating, removing or responding to a Release; or (iv) the Real Estate is subject to a lien in favor of any governmental entity for any liability, costs or
damages, under any Environmental Laws arising from, or costs incurred by, such governmental entity in response to a Release. No conditions have existed, currently exist, or are reasonably foreseeable, that would give rise to such a notice. 

(e) Neither Loan Parties nor any Subsidiary nor any Real Estate or presently conducted operations, nor any previously owned
real property or prior operations, is subject to any enforcement order from or liability agreement with any Governmental Authority or private Person respecting (i) compliance with any Environmental Law or (ii) any potential liabilities and
costs or remedial action arising from the Release or threatened Release. 
 (f) To the best of any Loan Party’s
knowledge, none of the present or past operations of the Loan Parties or their Subsidiaries is the subject of any investigation by any Governmental Authority evaluating whether any compliance action is warranted or any remedial action is needed to
respond to a Release or threatened Release. 
 (g) Neither the Loan Parties nor any of their Subsidiaries has entered into
any negotiations or settlement agreements with any Person (including the prior owner of its property) imposing material obligations or liabilities on any Loan Party or any of its Subsidiaries with respect to any remedial action in response to the
Release of a Contaminant or environmentally related claim. 
 (h) Neither the Loan Parties nor any of their Subsidiaries have
ever disposed of, sent or arranged for the transportation of Hazardous Materials on or from Real Estate or formerly owned real property which, pursuant to CERCLA or any similar or analogous state law, has been placed or is proposed to be paced (by
the United States Environmental Protection Agency (“EPA”) or similar state authority) on the “National Priorities List” or similar state list. 

  
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 (i) Neither the Loan Parties nor any of their Subsidiaries have been identified
by EPA, any similar state authority, or any third party, as a potentially responsible party under CERCLA, or any similar or analogous state law, with respect to the Real Estate or any other site currently or formerly owned, operated or used by Loan
Parties or their Subsidiaries. 
 (j) None of the products manufactured, distributed or sold by the Loan Parties or any of
their Subsidiaries contain asbestos containing material. 
 (k) No Environmental Lien has attached to the Real Estate. 

6.14 No Violation of Law. Neither any Loan Party nor any of their Subsidiaries is in violation of any Requirement of Law applicable to
it which violation could reasonably be expected to have a Material Adverse Effect. 
 6.15 No Default. Neither any Loan Party nor any
of their Restricted Subsidiaries is in default with respect to any note, indenture, loan agreement, mortgage, lease, deed, or other agreement to which such Person is a party or by which it is bound, which default could reasonably be expected to have
a Material Adverse Effect. 
 6.16 ERISA Compliance. Except as specifically disclosed in Schedule 6.16: 

(a) Each Plan is in compliance in all material respects with the applicable provisions of ERISA, the Code, and other federal or
state law. Each Plan which is intended to qualify under Section 401(a) of the Code has received a favorable determination letter from the IRS or an application for such a letter is currently pending with the IRS with respect thereto or the
applicable remedial amendment period has not elapsed and, to the best knowledge of any Loan Party, nothing has occurred which would prevent or cause the loss of such qualification. Each Borrower and each ERISA Affiliate has made all required
contributions to any Plan subject to Section 412 of the Code, and no application for a funding waiver or an extension of any amortization period pursuant to Section 412 of the Code has been made with respect to any Plan. 

(b) There are no pending or, to the best knowledge of any Borrower, threatened claims (other than ordinary claims for benefits
by participants and beneficiaries), actions or lawsuits, or action by any Governmental Authority, with respect to any Plan which has resulted or could reasonably be expected to result in a Material Adverse Effect. There has been no prohibited
transaction or violation of the fiduciary responsibility rules with respect to any Plan which has resulted or could reasonably be expected to result in a Material Adverse Effect. 

(c) (i) No ERISA Event has occurred within the past five (5) years or is reasonably expected to occur which has or
could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000; (ii) the Unfunded Pension Liability, in the aggregate, for all Pension Plans does not exceed $25,000,000; (iii) neither any Borrower nor any
ERISA Affiliate has incurred, or reasonably expects to incur, any liability under Title IV of ERISA to the PBGC with respect to any Pension Plan (other than premiums due and not delinquent under Section 4007 of ERISA); and (iv) neither any
Borrower nor any ERISA Affiliate has engaged in a transaction that could be subject to Section 4069 or 4212(c) of ERISA. 
 6.17
Taxes. The Loan Parties and their Restricted Subsidiaries have filed all federal and, except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, other tax returns and tax reports required
to be filed (or appropriate extensions have been timely filed), and have paid all federal and other taxes, assessments, fees and other governmental charges levied or imposed upon them or their properties, income or assets otherwise due and payable,
except where such nonpayment would not constitute a breach of Section 7.1(b). 

  
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 6.18 Regulated Entities. None of any Loan Party, any Person controlling any Loan Party, or
any Subsidiary of any Loan Party, is an “Investment Company” within the meaning of the Investment Company Act of 1940. No Loan Party is a regulated entity under the Federal Power Act, the Interstate Commerce Act, any state public
utilities code or law, or any other federal or state statute or regulation limiting its ability to incur Debt. 
 6.19 Use of Proceeds;
Margin Regulations. The proceeds of any Borrowing are to be used solely (a) to pay the costs and expenses related to this Agreement, (b) for working capital purposes of the Loan Parties, and (c) for general corporate purposes,
including acquisitions permitted under this Agreement. None of such proceeds will be used for the purpose of purchasing or carrying any “margin stock” as defined in Regulations T, U, or X of the Board of Governors of the Federal
Reserve System or for any other purpose which might constitute this transaction a “purpose credit” within the meaning of such regulations. No part of the proceeds of any Borrowing will be used for any purpose which violates, or is
inconsistent with, the provisions of Regulation X. No Loan Party nor any Subsidiary of such Loan Party is engaged in the business of purchasing or selling Margin Stock or extending credit for the purpose of purchasing or carrying Margin Stock.
Following the application of the proceeds of each Borrowing, not more than 25% of the value of the assets (either of any individual Borrower or of the Loan Parties on a consolidated basis) subject to the provisions of Section 7.9
or Section 7.18 or subject to any restriction contained in any agreement or instrument between any Borrower and any Lender or any Affiliate of any Lender relating to Debt and within the scope of Section 9.1(d)
will be Margin Stock. 
 6.20 Copyrights, Patents, Trademarks and Licenses, etc. Each Loan Party owns or is licensed or otherwise has
the right to use all of the Proprietary Rights, contractual franchises, licenses, permits, rights of way, authorizations, and other rights that are reasonably necessary for the operation of its businesses, without conflict with the rights of any
other Person. To the best knowledge of any Borrower, no slogan or other advertising device, product, process, method, substance, part, or other material now employed, or now contemplated to be employed, by any Loan Party or any Subsidiary of any
Loan Party infringes upon any rights held by any other Person, which in either case, could reasonably be expected to (a) have a Material Adverse Effect, (b) impair any Collateral, or (c) adversely affects the Agent’s enforcement
of its rights in any Collateral. No claim or litigation regarding any of the foregoing is pending, or, to the best knowledge of any Loan Party, threatened, and no patent, invention, device, application, principle or any statute, law, rule,
regulation, standard or code is pending or, to the knowledge of any Borrower, proposed, which, in either case, could reasonably be expected to have a Material Adverse Effect. 

6.21 No Material Adverse Change. No Material Adverse Effect has occurred since the latest date of the Financial Statements delivered to
the Lenders. 
 6.22 Full Disclosure. None of the representations or warranties (other than as to estimates, projections, and pro
forma Financial Statements) made by any Loan Party in the Loan Documents as of the date such representations and warranties are made or deemed made, and none of the statements contained in any exhibit, report, statement or certificate furnished by
or on behalf of any Loan Party in connection with the Loan Documents (including the offering and disclosure materials delivered by or on behalf of the Loan Parties to the Lenders prior to the Closing Date), contains any untrue statement of a
material fact or omits any material fact required to be stated therein or necessary to make the statements made therein, in light of the circumstances under which they are made, not misleading as of the time when made or delivered. Any estimates,
projections, and pro forma Financial Statements delivered to the Agent or the Lenders were prepared in good faith based on assumptions believed to be reasonable at the time. 

  
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 6.23 Locations of Collateral. Schedule 6.23, as updated in writing by
the Loan Parties to the Agent from time to time, contains, as of the last date updated pursuant to Section 5.3(j), a correct and complete list of all manufacturing facilities, warehouses, storage facilities, or customer or vendor
locations where Collateral is located (other than Collateral in transit). 
 6.24 Deposit Accounts. Schedule 6.24
contains as of the Closing Date a complete and accurate list of all Deposit Accounts maintained by the Loan Parties with any bank or other financial institution. 

6.25 Governmental Authorization. No approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any
Governmental Authority or other Person is necessary or required in connection with (a) the execution or delivery by, or enforcement against, any Loan Party of this Agreement or any other Loan Document or (b) the borrowing and repayment of
the Loans or the granting and maintenance of Liens in the Collateral, other than (i) those already obtained, (ii) the filing of UCC financing statements, and (iii) the filing of the Copyright Security Agreements and the Patent and
Trademark Agreements. 
 6.26 No Restrictions. There exists no document, contract, or agreement to which any Loan Party or any direct
or indirect parent of any Loan Party is a party that could reasonably be expected to materially and adversely affect this Agreement, any other Loan Document, or the transactions contemplated hereby or thereby or that otherwise restricts or prohibits
the transactions contemplated hereby or thereby. 
 6.27 OFAC. No Loan Party, no Subsidiary or, to the knowledge of any Loan Party or
any Subsidiary thereof, or any director, officer, employee, agent, affiliate or representative thereof, is a Sanctioned Person. No Loan Party or Subsidiary is located, organized or resident in a Sanctioned Country. Each Loan Party and its
Subsidiaries have instituted and maintained policies and procedures designed to promote and achieve compliance by such Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with applicable Sanctions. No
Borrowing or use of proceeds by any Loan Party or any Subsidiary thereof or other transaction contemplated by this Agreement will result in a violation by any Loan Party or any Subsidiary thereof of applicable Sanctions. 

6.28 Anti-Corruption Laws. Each Loan Party and its Subsidiaries have conducted their businesses in compliance with applicable
Anti-Corruption Laws and have instituted and maintained policies and procedures designed to promote and achieve compliance by such Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with applicable
Anti-Corruption Laws. Each Loan Party, its Subsidiaries and, to the knowledge of such Loan Party or such Subsidiaries, its directors, officers, employees and agents, are in compliance with applicable Anti-Corruption Laws. No Borrowing, use of
proceeds by any Loan Party or any Subsidiary thereof, or other transaction contemplated by this Agreement will result in a violation by any Loan Party or any Subsidiary thereof of any Anti-Corruption Law applicable to such Loan Party or Subsidiary.

  
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 ARTICLE 7. 

AFFIRMATIVE AND NEGATIVE COVENANTS 

Each Borrower (and each other Loan Party by execution of an Obligation Guaranty, with respect to covenants applicable to such Loan Party)
covenants to the Agent and each Lender that so long as any of the Obligations remain outstanding or this Agreement is in effect: 
 7.1
Taxes and Other Obligations. Except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, each Loan Party shall, and shall cause each of its Subsidiaries to, (a) file prior to
delinquency all tax returns and other tax reports which it is required to file; and (b) pay, or provide for the payment, when due, of all taxes, fees, assessments and other governmental charges against it or upon its property, income and
franchises, make all required withholding and other tax deposits, and establish adequate reserves or other provision required by GAAP for the payment of all such items, and provide to the Agent and the Lenders, upon request, satisfactory evidence of
its timely compliance with the foregoing. Notwithstanding the foregoing, the failure of a Loan Party or any of its Subsidiaries to comply with the foregoing shall not constitute a breach of this Section 7.1 if (i) such
amounts are not yet due and payable; or (ii) (A) such Loan Party is contesting such taxes, fees, assessments, or governmental charges in good faith by appropriate proceedings diligently pursued, (B) such Loan Party has established
proper reserves as required under GAAP, and (C) the nonpayment of such amounts does not result in the imposition of a Lien (other than a Permitted Lien). 

7.2 Legal Existence and Good Standing. Except as permitted by Section 7.9, each Loan Party shall maintain its legal
existence and its qualification and good standing in all jurisdictions in which the failure to maintain such existence and qualification or good standing could reasonably be expected to have a Material Adverse Effect. The foregoing shall not
restrict any merger, consolidation, wind-up, liquidation or dissolution permitted by Section 7.9. 
 7.3 Compliance
with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents. Each Loan Party shall comply, and shall cause each of its Subsidiaries to comply, in all material respects, with all Requirements of Law of any Governmental
Authority having jurisdiction over it or its business (including the Federal Fair Labor Standards Act and all Environmental Laws), except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect.
Each Loan Party will maintain in effect and enforce policies and procedures designed to ensure compliance by such Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with Anti-Corruption Laws and applicable
Sanctions. No Loan Party shall violate the provisions of any Material Agreement, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. Each Loan Party shall, and shall cause each of its
Subsidiaries to, obtain and maintain all licenses, permits, franchises, and governmental authorizations necessary to own its property and to conduct its business as conducted on the Closing Date, except to the extent that the failure to do so could
not reasonably be expected to have a Material Adverse Effect. No Loan Party shall modify, amend, or alter its certificate or articles of incorporation, or its limited liability company operating agreement or limited partnership agreement, as
applicable, other than in a manner which does not adversely affect the rights of the Lenders or the Agent. Each Loan Party shall conduct its businesses in compliance with applicable anti-corruption laws and maintain policies and procedures designed
to promote and achieve compliance with such laws. 
 7.4 Maintenance of Property; Inspection of Property. 

(a) Each Loan Party shall, and shall cause each of its Restricted Subsidiaries to, maintain all of its Collateral and other
material property necessary and useful in the conduct of its business, in good operating condition and repair, ordinary wear and tear excepted. 

(b) Each Loan Party shall permit representatives and independent contractors of the Agent (at the expense of the Borrowers) not
to exceed (i) once per year if the Availability is less than or equal to the greater of (x) 80% of the Maximum Revolver Amount and (y) $320,000,000 for five (5) consecutive Business Days during such one year period or (ii) twice per year if
Availability is less than or equal to the greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000 for five (5) consecutive Business Days during such one year period, or 

  
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(iii) otherwise, at no time during any year, in each case unless a Default or an Event of Default has occurred and is continuing, to visit and inspect any of its properties, to examine its
corporate, financial and operating records, and make copies thereof or abstracts therefrom and to discuss its affairs, finances and accounts with its directors, officers and independent public accountants, at such reasonable times during normal
business hours and as soon as may be reasonably desired, upon reasonable advance notice to such Loan Parties; provided, however, when a Default or an Event of Default exists, the Agent or any Lender may do any of the foregoing at the
expense of the Borrowers at any time during normal business hours without advance notice. The Agent and the Lenders shall give the Borrowers the opportunity to participate in any discussions with the Borrowers’ independent public accountants.
Notwithstanding anything to the contrary in this Section 7.4, at all times during such visits and inspections, the Agent or any Lender (or their respective representatives or contractors) must comply with all applicable reasonable
site regulations as the Loan Party or its Restricted Subsidiaries or any of their respective officers or employees may require by reasonable notice of the same. 

(c) Each Loan Party shall own or have valid licenses for all Proprietary Rights necessary for the anticipated future conduct of
the business of each such Loan Party. 
 7.5 Insurance. 

(a) Each Loan Party shall maintain, and shall cause each of its Restricted Subsidiaries to maintain, insurance with insurers
(with a Best Rating of at least A7, unless otherwise approved by the Agent) satisfactory to the Agent, (it being understood that the companies acceptable to the Agent on the Closing Date shall be acceptable thereafter absent a change in rating or
other circumstances), (i) with respect to the properties and business of the Borrowers and the Restricted Subsidiaries of such type (including product liability, workers' compensation, or commercial crime insurance), in such amounts, and with
such coverages and deductibles as are customary for companies similarly situated (it being understood that policies acceptable in form and substance to the Agent in connection with the initial closing shall be generally acceptable thereafter absent
a change in law, facts, or circumstances) and (ii) business interruption insurance in an amount not less than $300,000,000, with deductibles and subject to an insurance assignment satisfactory to the Agent (other than with respect to North
American Pipe Corporation or Westech Building Products, Inc. for which no business interruption insurance is required absent a change in circumstances). 

(b) Notwithstanding the foregoing, each Borrower shall maintain insurance with respect to the Collateral, covering casualty,
hazard, public liability, theft, malicious mischief, flood and other risks, in amounts, with endorsements and with insurers (with a Best Rating of at least A7, unless otherwise approved by the Agent) satisfactory to the Agent. From time to time upon
request, the Borrowers shall deliver to the Agent ACORD certificates of insurance or, upon request, certified copies of its insurance policies. Unless the Agent shall agree otherwise, each policy shall include satisfactory endorsements
(i) showing the Agent as a loss payee as to the Collateral or additional insured, as appropriate; (ii) requiring at least ten (10) days prior written notice to the Agent in the event of cancellation of the policy; and
(iii) specifying that the interest of the Agent in the property insured will not be invalidated by: (A) any act or neglect of any Borrower or the owner of the property, (B) foreclosure, notice of sale, or similar proceedings with
respect to the property, (C) change in the title or ownership of the property, or (D) change to a more hazardous occupancy. If any Borrower fails to provide and pay for any insurance, the Agent may, at its option, but shall not be required
to, procure the insurance and charge the Borrowers therefor. While no Event of Default exists, the Borrowers may settle, adjust or compromise any insurance claim, as long as the proceeds are delivered to the Agent in accordance with
Section 7.6. If an Event of Default exists, only the Agent shall be authorized to settle, adjust and compromise such claims. 

  
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 7.6 Insurance and Condemnation Proceeds. The Borrowers shall promptly notify the
Agent of any loss, damage, or destruction to the Collateral, whether or not covered by insurance, other than any loss, damage, or destruction involving an amount or fair market value of less than $5,000,000 in the aggregate for each occurrence
(“Minor Insurance Events”). Other than with respect to Minor Insurance Events, the Agent is hereby authorized to collect all insurance and condemnation proceeds in respect of the Collateral directly and, after deducting from
such proceeds the reasonable expenses, if any, incurred by the Agent in the collection or handling thereof, the Agent shall apply such proceeds, ratably, to the reduction of the Obligations (but not a reduction of the Maximum Revolver Amount) in the
order provided for in Section 3.7. In the case of any loss, damage, or destruction to any assets of the Loan Parties that includes Collateral and other assets of the Loan Parties, the Loan Parties shall deliver to the Agent
satisfactory evidence of the amount of the insurance and condemnation proceeds that are attributable to the Collateral; if the Agent is not satisfied with such evidence, the Agent may, at the expense of the Loan Parties, retain an independent third
party to perform such valuation. 
 7.7 Environmental Laws. 

(a) Each Loan Party shall, and shall cause each of their Subsidiaries to, conduct its business in compliance with all
Environmental Laws applicable to it, including those relating to the generation, handling, use, storage, and disposal of any Hazardous Material, except where the failure to do so could not reasonably be expected to have a Material Adverse Effect.
Each Loan Party shall, and shall cause each of its Subsidiaries to, take prompt and appropriate action to respond to any material non-compliance with Environmental Laws and shall report to the Agent any such material non-compliance and any such
response. 
 (b) Without limiting the generality of the foregoing, the Borrowers shall submit to the Agent and the Lenders
annually, commencing on the first Anniversary Date, and on each Anniversary Date thereafter, an update of the status of each material environmental noncompliance or material liability issue of a Loan Party with respect to its property that is
reasonably expected to result in liability equal to or greater than $25,000,000. The Agent or any Lender may request copies of technical reports prepared by any Loan Party and their communications with any Governmental Authority to determine whether
any Loan Party or any of their Subsidiaries is proceeding reasonably to correct, cure, or contest in good faith any alleged non-compliance or environmental liability. The Borrowers shall, at the Agent’s or the Required Lenders’ request and
at the Borrowers’ expense, (i) retain an independent environmental engineer acceptable to the Agent to evaluate the site, including tests if appropriate, where the material non-compliance or alleged material non-compliance with
Environmental Laws has occurred and prepare and deliver to the Agent a report setting forth the results of such evaluation, a proposed plan for responding to any environmental problems described therein, and an estimate of the costs thereof, and
(ii) provide to the Agent and the Lenders a supplemental report of such engineer whenever the scope of the environmental problems, or the response thereto or the estimated costs thereof, shall increase in any material respect. 

7.8 Compliance with ERISA. Each Loan Party shall, and shall cause each of its ERISA Affiliates to: (a) maintain each Plan in
compliance in all material respects with the applicable provisions of ERISA, the Code, and other federal or state law; (b) cause each Plan which is qualified under Section 401(a) of the Code to maintain such qualification; (c) make
all required contributions to any Plan subject to Section 412 of the Code; (d) not engage in a prohibited transaction or violation of the fiduciary responsibility rules with respect to any Plan which could reasonably be expected to result
in liability to any Loan Party in excess of $15,000,000 and (e) not engage in a transaction that could be subject to Section 4069 or 4212(c) of ERISA. 

  
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 7.9 Mergers; Consolidations; or Sales. No Loan Party nor any of their Restricted
Subsidiaries shall enter into any transaction of merger or consolidation, other than (a) as permitted by Section 7.25 or in the last paragraph of this Section 7.9 or (b) mergers among Loan Parties;
provided that, in any merger involving a Borrower, a Borrower must be the surviving entity. No Loan Party nor any of their Restricted Subsidiaries shall transfer, sell, assign, lease, or otherwise dispose of all or any part of its property
(including, without limitation, the stock or equity of any Restricted Subsidiary of such Loan Party except as expressly permitted by the immediately preceding sentence), or wind up, liquidate, or dissolve, except: 

(i) sales of Inventory in the ordinary course of its business; 

(ii) sales or other dispositions of Equipment in the ordinary course of business that are damaged, worn-out, obsolete, or no
longer used or useable by any Loan Party in its respective business; 
 (iii) sales, leases, or other transfers or
dispositions among the Loan Parties, or sales, leases, or other transfers or dispositions of any property not constituting Collateral among Loan Parties and the Restricted Subsidiaries to the extent not otherwise prohibited by the terms of this
Agreement; 
 (iv) the sale, discount, or transfer of delinquent Accounts that are not Eligible Accounts in the ordinary
course of business for purposes of collection, so long as no Default or Event of Default exists; 
 (v) Distributions
permitted by Section 7.10; 
 (vi) dispositions pursuant to mergers and consolidations permitted by
Section 7.9(a); 
 (vii) dispositions in connection with any Restricted Investments permitted by
Section 7.10; 
 (viii) leases, subleases, licenses, sublicenses, or transfers of property not
constituting Collateral (except for Proprietary Rights) (including the provision of software under an open source license), in each case to Joint Ventures or JV Subsidiaries or otherwise in the ordinary course of business and which do not materially
interfere with the business of the Loan Parties or any Restricted Subsidiary, so long as (A) such leases, subleases, licenses or sublicenses, or transfer do not adversely affect the Agent’s enforcement of its rights in any Collateral, or
(B) if the property leased, subleased, licensed, sublicensed, or transferred is Proprietary Rights, such Joint Venture, JV Subsidiary, or other Person grants a royalty free license to the Agent to use the Proprietary Rights in connection with
the Agent’s enforcement of its rights in any Collateral; 
 (ix) subject to Section 7.6, transfers of
property as a result of casualty events; 

  
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 (x) so long as no Default or Event of Default then exists or arises as a result
thereof, the wind up, liquidation, or dissolution of any Restricted Subsidiary, provided that if such Restricted Subsidiary is a Loan Party the assets of the dissolved Restricted Subsidiary will be transferred to another Loan Party at such
dissolution, wind up, or liquidation, and provided further that Westlake determines in good faith that such wind up, liquidation or dissolution is in the best interest of Westlake and is not materially disadvantageous to the Lenders; 

(xi) the issuance of Capital Stock by any Loan Party, or any Restricted Subsidiary thereof, to any Loan Party or any Restricted
Subsidiary, to the extent not otherwise prohibited by the terms of this Agreement; 
 (xii) dispositions of cash and Cash
Equivalents, and dispositions of assets in securities, brokerage and commodity accounts, each in the ordinary course of business in connection with transactions permitted hereunder; 

(xiii) dispositions in connection with any sale and leaseback transaction permitted by Section 7.18; 

(xiv) so long as (A) no Default or Event of Default then exists or arises as a result thereof, and (B) any mandatory
prepayments required by Section 3.3(a), if any are required, are made, sales of assets not constituting Collateral and the issuance and sale of Capital Stock in Restricted Subsidiaries , other than those in clauses
(i) through (xiii), for fair value, provided that (x) the Loan Parties or their Restricted Subsidiaries shall receive not less than 75% of the purchase price in the form of Permitted Consideration and
(y) if the issuance and sale of the Capital Stock in any Restricted Subsidiary would result in such Restricted Subsidiaries becoming an Unrestricted Subsidiary, such Restricted Subsidiary shall have been designated as an Unrestricted Subsidiary
in accordance with Section 7.28 prior to or concurrently with the issuance and sale of such Capital Stock. All assets purchased with such proceeds shall be free and clear of all Liens, except the Agent’s Liens or other
Permitted Liens; 
 (xv) dispositions in connection with transactions excluded from the definition of Restricted Investment;

 (xvi) the issuance of Capital Stock by Westlake Chemical OpCo LP and Westlake Chemical OpCo GP LLC to Westlake Chemical
Partners LP; 
 (xvii) the transfer by WPT LLC of Capital Stock of Westlake Chemical OpCo LP and Westlake Chemical OpCo GP
LLC to Westlake Chemical Partners LP; 
 (xviii) the transfer of additional limited partnership interests in Westlake
Chemical OpCo LP to Westlake Chemical Partners LP; and 
 (xix) any sale or other disposition of Capital Stock in, or
incurrence of Debt by, an Unrestricted Subsidiary. 
 Nothing in this Section 7.9 nor Section 7.25
shall prohibit the merger or consolidation of a Restricted Subsidiary into (i) Westlake (provided that Westlake is the survivor), or (ii) another Restricted Subsidiary (provided that if such transaction involves a Guarantor
or a Borrower, such Guarantor or Borrower shall be the survivor) or (iii) into any other Person subject to the conditions set forth in clause (xiv) above. 

  
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 7.10 Distributions; Capital Change; Restricted Investments. No Loan Party nor any of their
Restricted Subsidiaries shall: 
 (a) directly or indirectly declare or make, or incur any liability to make, any
Distribution (other than Distributions payable in Capital Stock (other than Disqualified Stock) of Westlake), except: 
 (i)
Distributions made and/or declared by Subsidiaries on account of their equity interests made to their respective equity holders on either a pro rata basis or on a basis more favorable to a Loan Party or Restricted Subsidiaries of a Loan Party; 

(ii) Distributions made and/or declared by Westlake, if, on a pro forma basis after giving effect to such Distribution:
(A) the Availability equals or exceeds the greater of (x) 20% of the Maximum Revolver Amount and (y) $80,000,000, or (B) to the extent the requirement in clause (A) is not met, (I) the Availability equals
or exceeds the greater of (x) 15% of the Maximum Revolver Amount and (y) $60,000,000 and (II) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; and 

(iii) without limiting the amount permitted under clause (ii) above, Distributions made and/or declared by
Westlake in the aggregate of up to $75,000,000; provided that the forgoing amount shall be increased by five percent (5%) in fiscal year 2015, and in each fiscal year thereafter; 

provided that for purposes of a Distribution, the Availability shall be calculated based on the most recent Borrowing Base Certificate
delivered pursuant to this Agreement prior to such Distribution (provided that the amount of Eligible Cash shall be the amount on deposit on the date of such Distribution and provided further that the Aggregate Revolver Outstandings
shall be calculated on the date of such Distribution) and Distributions are permitted under this clause (a) above only if no Default or Event of Default then exists or would arise as a result thereof and only to the extent that
any such Distribution is made and/or declared in accordance with applicable Requirement of Law and constitutes a valid, non voidable transaction. 

Without limiting the amounts permitted under clauses (i) to (iii) above, Distributions made and/or
declared by Westlake Chemical OpCo LP on account of its Capital Stock made to its equity holders on either a pro rata basis or on a basis more favorable to a Loan Party or Restricted Subsidiaries of a Loan Party shall be permitted, regardless of
whether a Default or Event of Default then exists. 
 (b) make any change in its capital structure which could reasonably be
expected to have a Material Adverse Effect; or 
 (c) make any Restricted Investment, except: 

(i) Restricted Investment made by Westlake and the Restricted Subsidiaries, if on a pro forma basis after giving effect to such
Restricted Investment, (A) the Availability equals or exceeds the greater of (x) 15% of the Maximum Revolver Amount and (y) $60,000,000; or (B) to the extent the requirement in clause (A) is not met,
(I) the Availability equals or exceeds the greater of (x) 12.5% of the Maximum Revolver Amount and (y) $50,000,000 and (II) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; and 

  
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 (ii) without limiting the amount permitted under clause
(i) above, Restricted Investment made by Westlake and the Restricted Subsidiaries, on an aggregate outstanding basis, of up to the greater of (x) $50,000,000 and (y) 1.25% of the Tangible Assets (measured as of the date of the
most recent financial statements delivered hereunder prior to such Restricted Investment) if on a pro forma basis after giving effect to such Restricted Investment, either (A) the Availability equals or exceeds the greater of (x) 12.5% of
the Maximum Revolver Amount and (y) $50,000,000, or (B) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; 

provided that no Restricted Investment shall be permitted if a Default or Event of Default has occurred and is continuing or would be
caused by such Restricted Investment; provided further that if any payment, prepayment, redemption, defeasance, purchase, or deposit in respect of any Debt of the Loan Parties is permitted to be made under Section 7.14(b),
and such payment, prepayment, redemption, purchase, or deposit otherwise constitutes a Restricted Investment, such payment, prepayment, redemption, defeasance, purchase, or deposit shall not be prohibited by the terms of this
Section 7.10(c). 
 For purposes of calculating the Availability in connection with the foregoing
Section 7.10(c), the Availability shall be calculated based on the most recent Borrowing Base Certificate delivered pursuant to this Agreement prior to such Restricted Investment (provided that the amount of Eligible Cash
shall be the amount on deposit on the date of such Restricted Investment and provided further that the Aggregate Revolver Outstandings shall be calculated on the date of such Restricted Investment). 

Notwithstanding the foregoing, so long as no Default or Event of Default has occurred and is continuing or would be caused thereby loans,
advances, extensions of credit, capital contributions, and other Restricted Investments by Westlake or any Restricted Subsidiary to any Unrestricted Subsidiary (other than the contribution of Collateral other than cash) shall be permitted to the
extent permitted by Section 7.28  
 The foregoing limitations in this clause (c) shall not apply to
the designation of a Restricted Subsidiary as an Unrestricted Subsidiary, which designation shall be subject to Section 7.28. 

Notwithstanding the foregoing, the preceding provisions shall not prohibit: 

(i) the payment of any dividend within sixty (60) days after the date of declaration of the dividend, if at the date of
declaration, the dividend payment would have complied with the provisions of this Agreement; 
 (ii) so long as no Default or
Event of Default has occurred and is continuing or would be caused thereby, (A) the repurchase, redemption or other acquisition or retirement for value of any Capital Stock of any Loan Party held by any current or former officer, director or
employee of any Loan Party pursuant to any equity subscription agreement, stock option agreement, shareholders’ agreement or similar plan or agreement, or (B) the repurchase of Capital Stock deemed to occur upon the exercise of stock
options to the extent such Capital Stock represent a portion of the exercise price of those stock options; 
 (iii) so long
as no Event of Default has occurred and is continuing or would be caused thereby, the making of any Distribution in exchange for, or out of the net cash proceeds of the substantially concurrent issuance or sale (other than to a Subsidiary of
Westlake) of, equity interests of Westlake or any Unrestricted Subsidiary (other than Disqualified Stock of Westlake) or from the substantially concurrent contribution of 

  
 41 

 
common equity capital to Westlake; or from the issuance or sale of convertible or exchangeable Disqualified Stock or convertible or exchangeable debt security of Westlake or any of its Restricted
Subsidiaries that have been converted or exchanged for such equity interests (other than equity interests (or Disqualified Stock or debt securities) sold to a Subsidiary of Westlake); 

(iv) so long as no Event of Default has occurred and is continuing or would be caused thereby, any Distribution made from the
net proceeds of a substantially concurrent Distribution or other transfer of cash from an Unrestricted Subsidiary to Westlake or any Restricted Subsidiary; 

(v) so long as no Event of Default has occurred and is continuing or would be caused thereby, the repurchase, redemption,
defeasance or other acquisition or retirement for value of Disqualified Stock or preferred stock of Westlake or any Restricted Subsidiary in exchange for, or out of or with the net cash proceeds from a substantially concurrent incurrence of
Disqualified Stock or preferred stock; 
 (vi) so long as no Event of Default has occurred and is continuing or would be
caused thereby, the Distribution, as a dividend or otherwise, of shares of equity interests of Unrestricted Subsidiaries; and 

(vii) payments to dissenting stockholders of Westlake or any Restricted Subsidiary pursuant to Requirements of Law made
pursuant to or in connection with a consolidation, merger or transfer of assets in connection with a transaction not prohibited by this Agreement. 

7.11 Transactions Affecting Collateral or Obligations. No Loan Party nor any of their Restricted Subsidiaries shall enter into any
transaction which would be reasonably expected to have a Material Adverse Effect. 
 7.12 Guaranties. No Loan Party nor any of their
Restricted Subsidiaries shall make, issue, or become liable on any Guaranty, except (a) Obligation Guaranties in favor of the Agent, (b) Guaranties of Debt permitted by Section 7.13, (c) to the extent constituting a
Restricted Investment permitted by Section 7.10, (d) Guaranties by Westlake Chemical OpCo LP and Westlake Chemical OpCo GP LLC, and any Subsidiaries thereof, of Debt of Westlake Chemical Partners LP, not to be secured by any
assets constituting Collateral and to the extent permitted by Section 7.13(m) or (n), (e) guarantees of performance by Westlake and its Restricted Subsidiaries of Unrestricted Subsidiaries and Joint Ventures in
the ordinary course of business, not to be secured by any assets constituting Collateral and to the extent permitted by Section 7.13(m) or (n), and (f) Limited Recourse Stock Pledges; in each case with respect
to clauses (e) and (f), to the extent such transactions are not otherwise prohibited by this Agreement. 

7.13 Debt. Neither Westlake nor Restricted Subsidiary shall incur or maintain any Debt, other than: 

(a) the Obligations; 

(b) Debt existing on the Closing Date and described on Schedule 7.13; 

(c) Capital Leases, mortgage financings or purchase money obligations, in each case, incurred for the purpose of financing all
or any part of the purchase price or cost of design, construction, installation or improvement of property, plant or equipment, in each case, not 

  
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constituting Inventory; provided that (i) Liens securing the same are permitted by clause (p) of the definition of “Permitted Liens,” and
(ii) the aggregate principal amount of purchase money obligations of Westlake and its Restricted Subsidiaries constituting Debt outstanding does not exceed the greater of (A) $300,000,000 and (B) 7.5% of Tangible Assets (measured as
of the date of the most recent financial statements delivered hereunder prior to the date of such incurrence) at any time; 

(d) the Bond Debt; 

(e) other unsecured Debt; 

(f) [Reserved]; 

(g) Debt of any Loan Party owed to any Restricted Subsidiaries, or Debt of any Restricted Subsidiary owed to the owner of its
Capital Stock which is a Loan Party; 
 (h) Debt to finance insurance premiums in an amount not to exceed $10,000,000 at any
time outstanding; 
 (i) Debt arising under Hedge Agreements or the Gas Supply/Purchase Agreement; 

(j) Debt among Loan Parties on terms of the kind customarily employed to allocate charges among members of a consolidated group
of entities, in each such case, that are fair and reasonable to the Loan Parties and consistent with past practices of the Loan Parties; 

(k) Guaranties permitted by Section 7.12; 

(l) Debt constituting Limited Recourse Stock Pledges; 

(m) Debt, other than those in clauses (a) through (l) above, secured by Liens on assets
not constituting Collateral, in the aggregate principal amount outstanding at any time not to exceed the greater of (i) $600,000,000 and (ii) 30% of Tangible Assets (measured as of the date of the most recent financial statements delivered
hereunder prior to such incurrence); and 
 (n) Debt, other than those in clauses (a) through
(m) above, secured by Liens on assets not constituting Collateral, provided that, without limiting the Agent’s discretion to exclude any Inventory at a location which is subject to a Lien in favor of a Person other
than the Agent from the Borrowing Base, any Inventory with a value in excess of $250,000 at a location which is subject to a Lien in favor of any Person other than the Agent will not be included in the Borrowing Base unless (x) a reserve
acceptable to the Agent has been established or (y) the holder of such Debt, at the Agent’s discretion, has entered into certain agreements with the Agent in form and substance reasonably satisfactory to the Agent to grant the Agent access
to such Inventory. 
 7.14 Payment / Prepayment of Debt. The Loan Parties shall not, 

(a) except as expressly permitted by clause (b) hereof, voluntarily prepay any principal of, or interest on,
any other Debt, including the Bond Debt, except: 
 (i) the Obligations in accordance with the terms of this Agreement; 

  
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 (ii) the Debt in connection with the IRBs; 

(iii) prepayments of the Debt permitted by Section 7.13(g) or (i); 

(iv) so long as no Default or Event of Default has occurred and is continuing after giving effect to such prepayment,
prepayment of any Debt with funds constituting unrestricted cash; 
 (v) refinancings, refundings, renewals, extensions,
replacements, or defeasances of other Debt to the extent such refinancing, refunding, renewal, extension, replacement, or defeasance is permitted by Section 7.13, whether subordinate to the Obligations or not; or 

(vi) payment from the net cash proceeds of, or in exchange for, an Equity Issuance by Westlake (other than to another Loan
Party or Subsidiary thereof); and 
 (b) shall not, directly or indirectly, pay, prepay, redeem, defease, or purchase, or
deposit funds or property for the payment (including, without limitation, a payment in respect of any sinking fund or defeasance of any Bond Debt), prepayment, redemption, defeasance, or purchase of, any Bond Debt except: 

(i) regularly scheduled interest and principal payments on Bond Debt made in compliance with the provisions thereof; 

(ii) so long as no Default or Event of Default has occurred and is continuing after giving effect to such prepayment,
redemption, or defeasance, redemptions, defeasance, or prepayments (whether voluntary or mandatory, and including redemptions of the GO Zone/Ike Zone debt in connection with an “Extraordinary Optional Redemption”) of the Bond Debt
with funds constituting restricted or unrestricted cash; 
 (iii) refinancings, refundings, renewals, extensions,
replacements, or defeasances of any Bond Debt to the extent such refinancing, refunding, renewal, extension, replacement, or defeasance is permitted by Section 7.13; and 

(iv) payment from the net cash proceeds of, or in exchange for, an Equity Issuance by Westlake (other than to another Loan
Party or Subsidiary thereof). 
 7.15 Transactions with Affiliates. Except as permitted by Section 7.9(a) or
7.12, or as set forth below, no Loan Party shall sell, transfer, distribute, or pay any money or property, including, but not limited to, any fees or expenses of any nature (including, but not limited to, any fees or expenses for
management services), to any Affiliate, or lend or advance money or property to any Affiliate, or invest in (by capital contribution or otherwise) or purchase or repurchase any stock or indebtedness (other than the Obligation Guaranties), or any
property, of any Affiliate, or become liable on any Guaranty of the indebtedness, dividends, or other obligations of any Affiliate other than (a) transactions between the Loan Parties and/or the Restricted Subsidiaries on terms of the kind
customarily employed to allocate charges among members of a consolidated group of entities, in each such case, that are fair and reasonable to the Loan Parties and/or the Restricted Subsidiaries and consistent with past practices of the Loan Parties
and/or the Restricted Subsidiaries, and (b) (i) transactions with respect to tax sharing agreements that became effective prior to the date hereof, and (ii) transactions with respect to tax sharing agreements that became effective on
or after the date hereof so long as (x) the Loan Parties do not pay more taxes in the aggregate pursuant to such tax sharing agreement described in this clause (ii) than the Loan Parties in the

  
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aggregate would be required to pay if each Loan Party filed a separate tax return, or (y) the tax sharing agreement described in this clause (ii) replaces a prior tax
sharing agreement and the Loan Parties do not pay more taxes in the aggregate pursuant to the tax sharing agreement than the Loan Parties would have paid in the aggregate under such prior tax sharing agreement. Notwithstanding the foregoing, while
no Event of Default has occurred and is continuing and so long as otherwise permitted in this Agreement, the Loan Parties and their Restricted Subsidiaries may engage in transactions with Affiliates in amounts and on terms no less favorable to the
Loan Parties and their Restricted Subsidiaries than would be obtained in a comparable arm’s-length transaction with a third party who is not an Affiliate; provided that the foregoing restrictions shall not apply to: 

(i) any Distribution and Restricted Investments permitted by Section 7.10; 

(ii) any transactions between or among any Loan Parties; 

(iii) any transactions with a Person (other than an Unrestricted Subsidiary) that is an Affiliate of a Loan Party or a
Restricted Subsidiary solely because such Loan Party or such Restricted Subsidiary owns, directly or indirectly through a Restricted Subsidiary, Capital Stock in, or controls, such Person; 

(iv) payment of reasonable directors’ fees to Persons who are not otherwise Affiliates of Westlake; 

(v) any issuance of Capital Stock not otherwise prohibited by this Agreement; 

(vi) transactions pursuant to the MLP Operating Agreements; 

(vii) transactions between Westlake or any of its Restricted Subsidiaries and any other Person, a director of which is also on
the Board of Directors of Westlake or any direct or indirect parent company of Westlake, and such common director is the sole cause for such other Person to be deemed an Affiliate of Westlake or any of its Restricted Subsidiaries; provided,
however, that such director abstains from voting as a member of the Board of Directors of Westlake or any direct or indirect parent company of Westlake, as the case may be, on any transaction with such other Person; 

(viii) transactions entered into by a Person prior to the time such Person becomes a Subsidiary or is merged or consolidated
into Westlake or a Subsidiary (provided such transaction is not entered into in contemplation of such merger or consolidation and is not otherwise prohibited by this Agreement); 

(ix) dividends, distributions and other transfers of assets to Westlake and its Restricted Subsidiaries by any Unrestricted
Subsidiary or Joint Venture; 
 (x) (A) guarantees of performance by Westlake and its Restricted Subsidiaries of Unrestricted
Subsidiaries and Joint Ventures in the ordinary course of business, (B) Limited Recourse Stock Pledges and (C) Guarantees permitted by Section 7.12; in each case, to the extent such transactions are not otherwise
prohibited by this Agreement; and 

  
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 (xi) any transaction to the extent the consideration paid by Westlake or
Restricted Subsidiary is (A) Capital Stock of Westlake or any Unrestricted Subsidiary (other than Disqualified Stock of Westlake), (B) proceeds from the issuance or sale of Capital Stock of Westlake or any Unrestricted Subsidiary (other
than Disqualified Stock of Westlake) (other than a sale or issuance to Westlake or any Restricted Subsidiary) or (C) proceeds from a capital contribution to Westlake; in each case, to the extent such transactions are not otherwise prohibited by
this Agreement; 
 provided that the transactions described in clauses (ii) and
(vii) above shall be on terms no less favorable to the Loan Parties and their Restricted Subsidiaries than would be obtained in a comparable arm’s-length transaction with a third party who is not an Affiliate. 

7.16 Business Conducted. No Loan Party will, directly or indirectly, permit or suffer to exist any material change in the type of
businesses in which it is engaged from the businesses of the Loan Parties as conducted on the Closing Date and in similar or related businesses that are reasonable extensions or additions to the Loan Parties’ business on the Closing Date. 

7.17 Liens. No Loan Party shall create, incur, assume, or permit to exist any Lien on any property now owned or hereafter acquired by
any of them, except Permitted Liens. 
 7.18 Sale and Leaseback Transactions. No Loan Party or any of their Restricted Subsidiaries
shall, directly or indirectly, enter into any arrangement with any Person providing for such Loan Party or such Restricted Subsidiary to lease or rent property that such Loan Party or such Restricted Subsidiary has sold or will sell or otherwise
transfer to such Person, except for sale and leaseback transactions with respect to which the obligations of the Loan Parties do not exceed $150,000,000, in the aggregate, at any time. 

7.19 New Subsidiaries. No Loan Party shall, directly or indirectly, organize, create, acquire, or permit to exist any Subsidiary
without giving the Agent at least ten (10) days prior written notice of such organization, creation, or acquisition (or such lesser time as agreed to by the Agent in its sole discretion). The Borrowers shall cause each Person that becomes a
Borrower or a Material Domestic Subsidiary after the Closing Date (whether as a result of acquisition, merger, creation, or otherwise), not later than ten (10) Business Days following distribution by the Agent or its counsel such Loan Documents
(a) to execute and deliver to the Agent an Obligation Guaranty and (b) to execute and deliver to the Agent all required Collateral Documents (substantially in the form of any comparable Collateral Documents delivered under the Existing
Credit Agreement or otherwise acceptable to the Agent) creating the Agent’s Liens in favor of the Agent in the Collateral owned by such Borrower or Material Domestic Subsidiary. 

7.20 Fiscal Year. No Loan Party shall change its Fiscal Year. 

7.21 Fixed Charge Coverage Ratio. Effective on and during the continuance of the Triggering Date and based on the most recently
delivered Financial Statements received pursuant to Section 5.2, the Borrowers will maintain a Fixed Charge Coverage Ratio for each period of immediately preceding twelve (12) months of not less than 1.0 to 1.0. 

7.22 Use of Proceeds. No Loan Party shall nor shall a Loan Party suffer or permit any Restricted Subsidiary to, use any portion of the
Loan proceeds, directly or indirectly, (a) to purchase or carry Margin Stock, (b) to repay or otherwise refinance indebtedness of the Borrowers or others incurred to purchase or carry Margin Stock, (c) to extend credit for the purpose
of purchasing or carrying any Margin Stock, or (d) to acquire any security in any transaction that is subject to Section 13 or 14 of the Exchange Act. Borrowers shall not request any Borrowing, or use or permit any use of the proceeds of
any Borrowing (i) in furtherance of an offer, payment, promise to pay, or authorization of the payment or giving of money, or anything else of value, to any Person in violation of any Anti-Corruption Laws 

  
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applicable to such Borrower or Subsidiary, (ii) for the purpose of funding, financing or facilitating any activities, business or transaction of or with, to its knowledge, any Sanctioned
Person, or in any Sanctioned Country, unless such activities, business or transactions are specifically permitted by the applicable Governmental Authority, or (iii) in any manner that would result in the violation by any Loan Party or any
Subsidiary thereof of any Sanctions applicable to such Loan Party or such Subsidiary. 
 7.23 Collateral. (a) To secure the full and
complete payment and performance of the Obligations, the Loan Parties shall (and shall cause each Material Domestic Subsidiary to) enter into Collateral Documents (substantially in the form of comparable Collateral Documents delivered under the
Existing Credit Agreement or otherwise acceptable to the Agent) pursuant to which, among other things, each such entity shall, to the extent permitted by applicable law, grant, pledge, assign, and create first priority the Agent’s Liens (except
to the extent Permitted Liens affect such priority) in and to all Collateral owned by such entity. 
 (b) Notwithstanding
anything to the contrary in this Agreement or any other Loan Document, obligations of any Loan Party to any Lender or any Affiliate of any Lender (other than the Bank or any Affiliate of the Bank, in which case no notice shall be required) under or
in connection with any Hedge Agreement constituting Bank Product shall not constitute Pari Passu Bank Product Obligations except to the extent that such Lender or its Affiliate and the applicable Loan Party have prior to or promptly following the
entering into of the applicable Hedge Agreement, delivered a written notice of the Bank Product Termination Value of the obligations of any Loan Party to such Lender or such Affiliate of such Lender under such Hedge Agreement to be included in Pari
Passu Bank Product Obligations, together with a description of the methodology to be used by such parties in determining the Bank Product Termination Value from time to time, and the Agent has acknowledged receipt of such notice in writing, which
acknowledgement shall be promptly delivered by the Agent following receipt of such notice. Upon receipt of such notice, the Agent shall establish a Bank Product Reserve in the amount of such Bank Product Termination Value. 

(c) The Bank Product Termination Value (other than with respect to the Bank or any Affiliate of the Bank, in which case no
notice shall be required) may be changed from time to time upon written notice to the Agent by the applicable Lender or Affiliate thereof. Any such increase in the Bank Product Termination Value shall not constitute a portion of the Pari Passu Bank
Product Obligations until the Agent shall have received written notice of such increase as set forth above, and the Agent has acknowledged receipt of such notice in writing, which acknowledgement shall be promptly delivered by the Agent following
receipt of such notice. Upon receipt of such notice, the Agent shall adjust the applicable Bank Product Reserve by the amount specified in such notice. 

(d) The provisions of this Section 7.23 shall continue to apply to any Hedge Agreement entered into by any
Lender or its Affiliates, in the event the Lender ceases to be a Lender pursuant to Section 4.10, 11.1(c), or 11.2 hereof, and each Lender may continue to provide reports of increase of Bank Product
Termination Values to the Agent until the Hedge Agreement is terminated or this Agreement is terminated pursuant to Section 10.1 or otherwise, but all other Bank Products of any Lender or its Affiliates shall cease to be a part of
the Obligations in the event any Lender ceases to be a Lender hereunder. 
 (e) No Bank Product Termination Value may be
established or increased at any time that a Default or Event of Default exists, or if creating a Reserve against such Bank Product Termination Value or the increase thereof would cause the Obligations to exceed the Borrowing Base, except with
respect to obligations of any Loan Party under or in connection with any Bank Products (other than Hedge Agreements) of the Bank or any Affiliate of Bank. 

  
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 (f) With respect to the obligations of the Loan Parties to the Bank or any
Affiliate of the Bank under any Hedge Agreement, the amount determined by the Bank or any Affiliate of the Bank, and reflected on the documentation and records of the Bank or of such Affiliate shall be part of the Pari Passu Bank Product
Obligations. No Bank Product Termination Value under or in connection with any Hedge Agreement of the Bank or any Affiliate of the Bank may be established or increased at any time that a Default or Event of Default exists, or if creating a Reserve
against such Bank Product Termination Value or the increase thereof would cause the Obligations to exceed the Borrowing Base. 

(g) Lenders (other than the Bank or any Affiliate of the Bank, but including Lenders who cease to be Lenders hereunder as
described in paragraph (d) above) agree to report Bank Product Termination Value to the Agent as requested by the Agent from time to time. 

(h) The Agent may, but shall not be required to, from time to time, at any time, establish Reserves with respect to Bank
Products (other than Hedge Agreements) provided by (i) the Bank or an Affiliate of the Bank, or (ii) any other Lender or any Affiliate of any Lender provided that such Lender or Affiliate shall provide notice of such Bank Product to
the Agent in accordance with the procedures set forth in this Section 7.23 with respect to Hedge Agreements, and the Agent has received and acknowledged such notice. 

7.24 [Reserved]. 
 7.25
Permitted Acquisitions. Westlake and its Restricted Subsidiaries may consummate Acquisitions, so long as: 
 (a) the
Acquisition by such Person is of a Person or assets which are in substantially the same lines of business as the business conducted by such Person on the date hereof, or any other business reasonably related thereto; 

(b) as of the closing thereof, each Acquisition has been approved and recommended by the board of directors (or equivalent
body) of the Person to be acquired or from which such business or asset is to be acquired; 
 (c) prior to the closing of
such Acquisition (other than an Acquisition of assets), the Person to be acquired is Solvent; 
 (d) as of the closing of the
Acquisition, after giving effect thereto, the Person that is the acquiring party must be Solvent and the Loan Parties, on a consolidated basis, must be Solvent; 

(e) if such Acquisition is structured as a merger by a Loan Party, a Loan Party must be the surviving entity after giving
effect to such merger; 
 (f) if such Acquisition is structured as a merger by a Borrower, a Borrower must be the surviving
entity after giving effect to such merger; 
 (g) as of the closing of any Acquisition, no Default or Event of Default shall
exist or occur as a result thereof, and after giving effect thereto; 

  
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 (h) if the Acquisition target is to be a Restricted Subsidiary, then the
Borrowers shall have complied with the terms and conditions of Section 7.19; 
 (i) the absence of action,
suit, investigation, or proceeding pending or threatened in any court or before any arbitrator or Governmental Authority that affects the target or the proposed Acquisition, which could reasonably be expected to have a Material Adverse Effect on the
target or the Loan Parties; 
 (j) immediately after giving effect to the Acquisitions, (A) the Availability equals or
exceeds the greater of (x) 15% of the Maximum Revolver Amount and (y) $60,000,000, or (B) to the extent the requirement in clause (A) is not met, (I) the Availability equals or exceeds the greater of
(x) 12.5% of the Maximum Revolver Amount and (y) $50,000,000 and (II) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; provided that to the extent neither of the foregoing requirements in this clause
(j) is met, Westlake and the Restricted Subsidiaries may nevertheless consummate Acquisitions, on an aggregate outstanding basis, of up to the greater of (x) $100,000,000 and (y) 2.5% of the Tangible Assets (measured as of the
date of the most recent financial statements delivered hereunder prior to such Acquisition), if immediately after giving effect to the Acquisitions, either (A) the Availability equals or exceeds the greater of (x) 12.5% of the Maximum
Revolver Amount and (y) $50,000,000 but is less than the greater of (x) 15% of the Maximum Revolver Amount and (y) $60,000,000, or (B) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; and 

(k) for the purposes of calculating the Availability under this Section 7.25, no assets of the Person to be
acquired or the assets to be acquired shall be included in the Borrowing Base unless such assets are acceptable to the Agent. 
 For purposes of calculating
the Availability in connection with the foregoing clauses (j) and (k), the Availability shall be calculated based on the most recent Borrowing Base Certificate delivered pursuant to this Agreement prior to such
Acquisition (provided that the amount of Eligible Cash shall be the amount on deposit on the date of such Acquisition and provided further that the Aggregate Revolver Outstandings shall be calculated on the date of such Acquisition).

 For purposes of Sections 7.25 and 7.10(c) only, notwithstanding anything in Sections 7.25 or
7.10(c) to the contrary, (i) a series of investments not to exceed $200,000,000 in one or more Joint Ventures which will own feedstock, raw material and ethylene pipeline, storage and fractionating facilities, and
(ii) investments in Suzhou Huasu Plastics Co., Ltd. made on or prior to the date hereof, plus additional investments therein not to exceed $55,000,000, shall each be permitted hereunder, and no assets at any time owned by such Joint
Venture or Suzhou Huasu Plastics Co., Ltd. shall be included in the Borrowing Base. 
 Notwithstanding the foregoing, any Acquisition made with the net cash
proceeds of, or in exchange for, the Capital Stock of Westlake or any Unrestricted Subsidiary (other than any issuance or exchange to another Loan Party or a Subsidiary thereof) or from the issuance or sale of convertible or exchangeable
Disqualified Stock or convertible or exchangeable debt security of Westlake or any of its Restricted Subsidiaries that have been converted or exchanged for such equity interests (other than Capital Stock (or Disqualified Stock or debt securities)
sold to a Subsidiary of Westlake) or with the net cash proceeds of a distribution from an Unrestricted Subsidiary, in each case substantially contemporaneously with such Acquisition, shall not be subject to the foregoing limitations. 

7.26 Excluded Deposit Accounts. In the event the amount of funds on deposit in the Local Accounts ever exceeds $1,000,000 at any time
in the aggregate on any date of determination, the Borrowers shall promptly deliver to the Agent Blocked Account Agreements with respect to each such Local Account. 

  
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 7.27 Further Assurances. The Loan Parties shall execute and deliver, or cause to be
executed and delivered, to the Agent and/or any Lender such documents and agreements, and shall take or cause to be taken such actions, as the Agent may, from time to time, reasonably request to carry out the terms and conditions of this Agreement
and the other Loan Documents. 
 7.28 Designation of Restricted and Unrestricted Subsidiaries; Restricted Investments in Unrestricted
Subsidiaries. 
 (a) The Board of Directors of Westlake may designate any Restricted Subsidiary as an Unrestricted
Subsidiary and designate any Unrestricted Subsidiary as a Restricted Subsidiary, provided that (i) any Subsidiary designated as an “Unrestricted Subsidiary” shall not be a guarantor or pledgor under any Indenture,
(ii) both immediately before and after giving effect to any such designation (and any deemed Restricted Investment in an Unrestricted Subsidiary resulting from such designation), no Default or Event of Default has then occurred and is
continuing or would result therefrom. 
 (b) Without limiting clause (a) above, the Board of Directors of
Westlake may not designate after the Closing Date any Restricted Subsidiary as an Unrestricted Subsidiary, or make after the Closing Date a Restricted Investment in any Unrestricted Subsidiary unless one of the following conditions is met: 

(i) If the long term senior unsecured debt of Westlake is rated Investment Grade, the following shall apply: 

(1) the Availability equals or exceeds the greater of (x) 15% of the Maximum Revolver Amount or (y) $60,000,000; or

 (2) (i) the Availability equals or exceeds the greater of (A) 12.5% of the Maximum Revolver Amount or
(B) $50,000,000, and (ii) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0, after giving effect to the applicable designation or Restricted Investment; or 

(3) if only one of the two conditions set forth in the foregoing clause (2) is met, the Tangible Assets of
all Unrestricted Subsidiaries (measured in respect of each Subsidiary on the date of its designation) which have been designated as Unrestricted Subsidiaries pursuant to this clause (3) and the fair market value of any such
Restricted Investments pursuant to this clause (3) shall not exceed the greater of (x) $150,000,000 and (y) 3.75% of Tangible Assets in all periods in which only one of the foregoing two conditions is met; and 

(4) if neither of the two conditions set forth in the foregoing clause (2) is met, the Tangible Assets of
all Unrestricted Subsidiaries (measured in respect of each Subsidiary on the date of its designation) which have been designated as Unrestricted Subsidiaries pursuant to this clause (4) and all Restricted Investments pursuant to
this clause (4) shall not exceed the greater of (x) $50,000,000 and (y) 1.25% of Tangible Assets. 

  
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 (ii) If the long term senior unsecured debt of Westlake is not rated Investment
Grade, the following shall apply: 
 (1) the Availability equals or exceeds the greater of (x) 20% of the Maximum
Revolver Amount or (y) $80,000,000; or 
 (2) (i) the Availability equals or exceeds the greater of
(x) 15% of the Maximum Revolver Amount or (y) $60,000,000, and (ii) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0, after giving effect to the applicable designation or Restricted Investment pursuant to this
clause (2); or 
 (3) if only one of the two conditions set forth in the foregoing clause
(2) is met, the Tangible Assets of all Unrestricted Subsidiaries (measured in respect of each Subsidiary on the date of its designation pursuant to this clause (3)) which have been designated as Unrestricted
Subsidiaries pursuant to this clause (3) and the fair market value of any such Restricted Investments pursuant to this clause (3) shall not exceed the greater of (x) $100,000,000 and (y) 2.5% of
Tangible Assets in all periods in which only one of the foregoing two conditions set forth in clause (2) is met; or 

(4) if neither of the two conditions set forth in the foregoing clause (2) is met, the Tangible Assets of
all Unrestricted Subsidiaries (measured in respect of each Subsidiary on the date of its designation pursuant to this clause (4)) which have been designated as Unrestricted Subsidiaries pursuant to this clause
(4) and the fair market value of any such Restricted Investments pursuant to this clause (4), shall not exceed the greater of (x) $40,000,000 and (y) 1.0% of Tangible Assets. 

In the case of any designation by Westlake of a Person as an Unrestricted Subsidiary on the first day that such Person becomes
a Subsidiary of Westlake in accordance with the terms of this Agreement, such designation shall be deemed to have occurred for all purposes of this Agreement simultaneously with, and automatically upon, such Person becoming a Subsidiary of Westlake,
and as such designation shall not be subject to the conditions set forth in this clause (b). 
 (c) Any
designation of a Subsidiary of Westlake as an Unrestricted Subsidiary after the Closing Date will be evidenced by delivery by Westlake to the Agent of a certified copy of the board resolution of Westlake giving effect to such designation and an
Officers’ Certificate certifying that such designation complied with all applicable terms of this Agreement and was permitted by Section 7.28. If, at any time, any Unrestricted Subsidiary designated after the Closing Date
would fail to meet all applicable requirements as an Unrestricted Subsidiary, it will thereafter cease to be an Unrestricted Subsidiary and be treated as a Restricted Subsidiary for purposes of the Loan Documents, and any Debt of such Subsidiary
will be deemed to be incurred by a Restricted Subsidiary of Westlake as of such date and, if such Debt is not permitted to be incurred as of such date under Section 7.13, an Event of Default will arise due to such non-compliance.

 (d) If a Restricted Subsidiary is designated as an Unrestricted Subsidiary, the aggregate fair market value of all
outstanding Restricted Investments owned by Westlake and its Restricted Subsidiaries in the Subsidiary designated as Unrestricted Subsidiary will be deemed to be a Restricted Investment made as of the time of the designation and, to the extent not
otherwise permitted by Section 7.10 or under one or more clauses of the definition of Restricted Investment, 

  
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will reduce the amount available for Restricted Investments under Section 7.10. That designation will only be permitted if the Restricted Investment would be permitted at that
time and if the Restricted Subsidiary otherwise meets the definition of an Unrestricted Subsidiary. 
 (e) If a Restricted
Subsidiary that is a Subsidiary Guarantor is designated an Unrestricted Subsidiary in accordance with the terms of this Agreement, such Subsidiary shall be released from the Obligation Guaranty and Collateral Documents to which it is a party. 

(f) If, after giving effect to the designation of a Restricted Subsidiary as an Unrestricted Subsidiary (except to the extent
such Subsidiary is designated as an Unrestricted Subsidiary simultaneously with becoming a Subsidiary), the Availability is less than 60% of the Maximum Revolver Amount, Westlake shall deliver to the Agent a pro forma Borrowing Base Certificate
(after giving effect to such designation) at the time of such designation. 
 7.29 Anti-Corruption Laws. No Loan Party shall directly
or indirectly use the proceeds of any Loan or Letter of Credit for any purpose which would breach the United States Foreign Corrupt Practices Act of 1977, the UK Bribery Act 2010, or other similar legislation in other jurisdictions. 

ARTICLE 8. 
 CONDITIONS
OF LENDING 
 8.1 Conditions Precedent to Making of Loans on the Closing Date. The obligation of the Lenders to make the
Revolving Loans on the Closing Date, and the obligation of the applicable Letter of Credit Issuer to issue any Letter of Credit on the Closing Date, are subject to the following conditions precedent having been satisfied in a manner satisfactory to
the Agent and each Lender: 
 (a) This Agreement and the other Loan Documents shall have been executed by each party thereto
and each Loan Party, as applicable, shall have performed and complied with all covenants, agreements, and conditions contained herein and the other Loan Documents which are required to be performed or complied with by the Loan Parties before or on
such Closing Date. 
 (b) Upon making the Revolving Loans on the Closing Date (including such Revolving Loans made to finance
the Closing Fee or otherwise as reimbursement for fees, costs, and expenses then payable under this Agreement), and with all its obligations current, the Borrowers shall have Availability of at least $150,000,000. 

(c) All representations and warranties made hereunder and in the other Loan Documents shall be true and correct as if made on
such date. 
 (d) No Default or Event of Default shall have occurred and be continuing after giving effect to the Revolving
Loans to be made and the Letters of Credit to be issued on the Closing Date. 
 (e) The Agent and the Lenders shall have
received such opinions of counsel for the Loan Parties as the Agent or any Lender shall request, each such opinion to be in a form, scope, and substance reasonably satisfactory to the Agent, the Lenders, and their respective counsel. 

(f) The Agent shall have received financing statements or amendments in proper form for filing, under the UCC in all
jurisdictions that the Agent may deem necessary or desirable in order to perfect the Agent’s Liens. 

  
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 (g) The Borrowers shall have paid all fees, including the amounts owing as of the
Closing Date under the Fee Letter, and expenses of the Agent and the Attorney Costs incurred in connection with any of the Loan Documents and the transactions contemplated thereby to the extent invoiced. 

(h) The Agent shall have received evidence, in form, scope, and substance, reasonably satisfactory to the Agent, of all
insurance coverage as required by this Agreement. 
 (i) All proceedings taken in connection with the execution of this
Agreement, the Notes, all other Loan Documents, and all documents and papers relating thereto shall be satisfactory in form, scope, and substance to the Agent and the Lenders. 

(j) Each Loan Party shall have established all of its domestic Deposit Accounts at the Bank or shall have entered into Blocked
Account Agreements (on terms acceptable to the Agent) with respect to all domestic Deposit Accounts not established at the Bank other than immaterial local accounts of the Loan Parties (the “Local Accounts”) so long as the
amount of funds on deposit in such accounts does not exceed $1,000,000 in the aggregate at any time. 
 (k) Since
December 31, 2013, no event has occurred and is continuing, or would result from such extension of credit, which has had or would (after giving effect thereto) reasonably be expected to have a Material Adverse Effect. 

(l) The Agent shall have received, each in form and substance satisfactory to the Agent, the Financial Statements. 

(m) Evidence satisfactory to the Lenders that no approval, consent, exemption, authorization, or other action by, or notice to,
or filing with, any Governmental Authority or other Person is necessary or required in connection with the execution, delivery or performance by, or enforcement against, any Loan Party of this Agreement or any other Loan Document other than
(i) those already obtained, (ii) the filing of UCC financing statements, and (iii) the filing of the Copyright Security Agreements and the Patent and Trademark Agreements, if any. 

(n) The Lenders are satisfied with the environmental matters concerning the Loan Parties. 

(o) Without limiting the generality of the items described above, each Loan Party shall have delivered or caused to be
delivered to the Agent (in form and substance reasonably satisfactory to the Agent), the financial statements, instruments, resolutions, documents, agreements, certificates, opinions, and other items set forth on the “Closing
Checklist” delivered by the Agent to Westlake prior to the Closing Date. 
 The acceptance by the Borrowers of any Loans made
or Letters of Credit issued on the Closing Date shall be deemed to be a representation and warranty made by the Borrowers to the effect that all of the conditions precedent to the making of such Loans or the issuance of such Letters of Credit have
been satisfied or waived, with the same effect as delivery to the Agent and the Lenders of a certificate signed by a Responsible Officer on behalf of the Borrowers, dated the Closing Date, to such effect. 

Execution and delivery to the Agent by a Lender of a counterpart of this Agreement shall be deemed confirmation by such Lender that
(i) all conditions precedent in this Section 8.1 have been fulfilled to the satisfaction of such Lender, (ii) the decision of such Lender to execute and deliver to the Agent an executed counterpart of this Agreement was
made by such Lender independently and without 

  
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reliance on the Agent or any other Lender as to the satisfaction of any condition precedent set forth in this Section 8.1, and (iii) all documents sent to such Lender for
approval consent, or satisfaction were acceptable to such Lender, unless the Agent shall have received notice from such Lender prior to the proposed Closing Date specifying its objection with respect to the foregoing clause (i),
(ii), or (iii). 
 8.2 Conditions Precedent to Each Loan. The obligation of the Lenders to make each Loan,
including the initial Revolving Loans on the Closing Date, and the obligation of the applicable Letter of Credit Issuer to issue any Letter of Credit shall be subject to the further conditions precedent that on and as of the date of any such
extension of credit: 
 (a) The following statements shall be true, and the acceptance by the Borrowers of any extension of
credit shall be deemed to be a statement to the effect set forth in clauses (i), (ii), and (iii) with the same effect as the delivery to the Agent and the Lenders of a certificate signed by a
Responsible Officer on behalf of the Loan Parties, dated the date of such extension of credit, stating that: 
 (i) The
representations and warranties contained in this Agreement and the other Loan Documents are correct in all material respects (provided that any such representation and warranty that is qualified as to “materiality”, “Material
Adverse Effect” or similar language shall be true and correct in all respects) on and as of the date of such extension of credit as though made on and as of such date, other than any such representation or warranty which relates to a specified
prior date and except to the extent the Agent and the Lenders have been notified in writing by the Borrowers that any representation or warranty is not correct and the Required Lenders have explicitly waived in writing compliance with such
representation or warranty; 
 (ii) No event has occurred and is continuing, or would result from such extension of credit,
which constitutes a Default or an Event of Default; and 
 (iii) No event has occurred and is continuing, or would result
from such extension of credit, which has had or would have a Material Adverse Effect since the latest date of the Financial Statements delivered to the Lenders pursuant to Section 5.2(a). 

(b) No such Borrowing shall exceed Availability, provided, however, that the foregoing conditions precedent set
forth in this Section 8.2 are not conditions to each Lender participating in or reimbursing the Bank or the Agent for such Lenders’ Pro Rata Share of any Non-Ratable Loan or Agent Advance made in accordance with the
provisions of Sections 1.2(h) and (i). 
 ARTICLE 9. 

DEFAULT; REMEDIES 
 9.1
Events of Default. It shall constitute an event of default (“Event of Default”) if any one or more of the following shall occur for any reason: 

(a) any failure or refusal by any Loan Party to pay (i) any principal of the Obligations (other than Bank Products) when
the same becomes due (whether by its terms, by acceleration, or as otherwise provided in the Loan Documents); or (ii) interest, fees, premium, or any other part of the Obligations (other than Bank Products) within one day after the same becomes
due and payable in accordance with the Loan Documents, whether upon demand or otherwise; 

  
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 (b) any representation or warranty made or deemed made by any Loan Party in this
Agreement or in any of the other Loan Documents, any Financial Statement, or any certificate furnished by any Loan Party at any time to the Agent or any Lender shall prove to be untrue in any material respect as of the date on which made, deemed
made, or furnished; 
 (c) (i) any default shall occur in the observance or performance of any of the covenants and
agreements contained in Sections 5.2(j), 7.2 (as to existence only), 7.5, 7.9 through 7.29, or Section 11 of the Security Agreement, (ii) any default
shall occur in the observance or performance of any of the covenants and agreements contained in Sections 5.3 or 7.4 and such default shall continue for five (5) days or more, provided that there are not
more than, in the aggregate, three (3) occurrences of any such default in any twelve (12) month period; or (iii) any default shall occur in the observance or performance of any of the other covenants or agreements (not specified in
Sections 9.1(a), (b), (c)(i), or (c)(ii)) contained in any other Section of this Agreement or any other Loan Document and such default shall continue for thirty (30) days or more or
(iv) any default shall occur under Section 5.2 (other than clause (j) thereof) and such default shall continue for 5 Business Days or more; 

(d) any “default” or “event of default” shall occur with respect to any Debt (other than the
Obligations) of any Loan Party in an outstanding principal amount which exceeds $20,000,000 (in the aggregate), or under any agreement or instrument under or pursuant to which any such Debt may have been issued, created, assumed, or guaranteed by
any Loan Party, and such default shall continue for more than the period of grace, if any, therein specified, if the effect thereof (with or without the giving of notice or further lapse of time or both) is to accelerate, or to permit the holders of
any such Debt to accelerate, the maturity of any such Debt; or any such Debt shall be declared due and payable or be required to be prepaid prior to the stated maturity or redemption date thereof; provided that this clause
(d) shall not apply to secured Debt that becomes due as a result of the voluntary sale or transfer of the property or assets securing such Debt, if such sale or transfer is permitted hereunder and under the documents providing for such
Debt; 
 (e) (i) any Loan Party that is a Borrower or a Material Subsidiary shall (A) file a voluntary petition in
bankruptcy or file a voluntary petition or an answer or otherwise commence any action or proceeding seeking reorganization, arrangement, or readjustment of its debts or for any other relief under the federal Bankruptcy Code, as amended, or under any
other bankruptcy or insolvency act or law, state or federal, now or hereafter existing, or consent to, approve of, or acquiesce in, any such petition, action, or proceeding; (B) apply for or acquiesce in the appointment of a receiver, assignee,
liquidator, sequestrator, custodian, monitor, trustee or similar officer for it or for all or any part of its property; (C) make an assignment for the benefit of creditors; (D) be unable generally to pay its debts as they become due; or
(E) not be Solvent; or (ii) the Loan Parties, on a consolidated basis, shall not be Solvent; 
 (f) an involuntary
petition shall be filed or an action or proceeding otherwise commenced seeking reorganization, arrangement, consolidation or readjustment of the debts of any Loan Party that is a Borrower or a Material Subsidiary or for any other relief under the
federal Bankruptcy Code, as amended, or under any other bankruptcy or insolvency act or law, state or federal, now or hereafter existing and such petition or proceeding shall not be dismissed within sixty (60) days after the filing or
commencement thereof or an order of relief shall be entered with respect thereto; 

  
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 (g) a receiver, assignee, liquidator, sequestrator, custodian, monitor, trustee
or similar officer for any Loan Party that is a Borrower or a Material Subsidiary or for all or any part of their respective property shall be appointed or a warrant of attachment, execution, or similar process shall be issued against any part of
the property of Westlake or any of its Restricted Subsidiaries; 
 (h) any Loan Party shall file a certificate of dissolution
under applicable state law or shall be liquidated, dissolved or wound-up or shall commence or have commenced against it any action or proceeding for dissolution, winding-up or liquidation, or shall take any corporate action in furtherance thereof
except as permitted under Sections 7.2 or 7.9; 
 (i) all or any material part of the
property of any Loan Party shall be nationalized, expropriated, or condemned, seized, or otherwise appropriated, or custody or control of such property or of such Loan Party shall be assumed by any Governmental Authority or any court of competent
jurisdiction at the instance of any Governmental Authority, except where contested in good faith by proper proceedings diligently pursued where a stay of enforcement is in effect; 

(j) any Loan Document shall be terminated, revoked, or declared void, invalid, or unenforceable or challenged by any Loan Party
or any other obligor; 
 (k) one or more judgments, orders, decrees, or arbitration awards is entered against the Loan
Parties involving in the aggregate liability (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage) as to any single or related or unrelated series of transactions, incidents or conditions,
of $20,000,000 or more, and either (i) enforcement proceedings are commenced upon such judgment, order, decree, or award, or (ii) there is a period of 30 consecutive days during which a stay of enforcement of such judgment, order, decree,
or award, by reason of pending appeal or otherwise, is not in effect; 
 (l) any loss, theft, damage, or destruction of any
item or items of Collateral or other property of any Loan Party occurs which could reasonably be expected to cause a Material Adverse Effect and is not adequately covered by insurance; 

(m) there is filed against any Loan Party any action, suit, or proceeding under any federal or state racketeering statute
(including the Racketeer Influenced and Corrupt Organization Act of 1970), which action, suit, or proceeding (i) is not dismissed within one hundred twenty (120) days, and (ii) could reasonably be expected to result in the
confiscation or forfeiture of any material portion of the Collateral; 
 (n) for any reason other than the failure of the
Agent to take any action available to it to maintain perfection of the Agent’s Liens, pursuant to the Loan Documents, any Loan Document ceases to be in full force and effect or any Lien with respect to any material portion of the Collateral
intended to be secured thereby ceases to be, or is not, valid, perfected, and prior to all other Liens (other than Permitted Liens) or is terminated, revoked, or declared void; 

(o) (i) an ERISA Event shall occur with respect to a Pension Plan or Multi-Employer Plan which has resulted or could
reasonably be expected to result in liability of any Loan Party under Title IV of ERISA to the PBGC in an aggregate amount in excess of $15,000,000; or (ii) any Loan Party or any ERISA Affiliate shall fail to pay when due, after the expiration
of any applicable grace period, any installment payment with respect to its withdrawal liability under Section 4201 of ERISA under a Multi-employer Plan in an aggregate amount in excess of $15,000,000; 

  
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 (p) there occurs a Change of Control; 

(q) other than those existing on the Closing Date and disclosed on Schedule 6.13, any Environmental
Liabilities in excess of $20,000,000 (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage), but excluding: (i) Environmental Liabilities in an aggregate amount at any time up to
$35,000,000 for which a Reserve is established for 100% of such aggregate amount; and (ii) amounts in excess of $35,000,000 secured by a perfected first lien on cash collateral equal to 100% of that portion of such amount in excess of the
Reserves described in clause (i); or 
 (r) Except to the extent such Debt is prepaid or redeemed in compliance
with Section 7.14, an event shall occur, including, without limitation, a “change in control” or “change of control” as defined in any documents or agreements evidencing or creating the Bond Debt
and (i) the trustee or the required holders of any such Debt shall initiate notice under provisions governing such Debt to require (or any Loan Party shall automatically be so required) to redeem or repurchase such Debt, or (ii) any Loan
Party shall initiate notice to holders of the Bond Debt in connection with a redemption of such Debt. 
 9.2 Remedies. 

(a) If a Default or an Event of Default exists, the Agent may, in its discretion, and shall, at the direction of the Required
Lenders, do one or more of the following at any time or times and in any order, without notice to or demand on the Borrowers: (i) restrict the amount of or refuse to make Revolving Loans; (ii) restrict or refuse to provide Letters of
Credit or Credit Support; and (iii) provide written notice to the trustee under the IRB that a default has occurred and requesting acceleration of the maturity of the IRBs. If an Event of Default exists, the Agent, may, in its discretion, and
shall, at the direction of the Required Lenders, reduce the Maximum Revolver Amount, or the advance rates against Eligible Accounts and/or Eligible Inventory used in computing the Borrowing Base, or reduce one or more of the other elements used in
computing the Borrowing Base. In addition, if an Event of Default exists, the Agent shall, at the direction of the Required Lenders, do one or more of the following, in addition to the actions described in the preceding sentence, at any time or
times and in any order, without notice to or demand on the Borrowers: (A) terminate the Commitments and this Agreement; (B) declare any or all Obligations (other than Obligations with respect to Bank Products) to be immediately due and
payable; provided, however, that upon the occurrence of any Event of Default described in Sections 9.1(e), 9.1(f), 9.1(g), or 9.1(h), the Commitments shall automatically and
immediately expire and all Obligations shall automatically become immediately due and payable without notice or demand of any kind; (C) require the Borrowers to cash collateralize all outstanding Letter of Credit Obligations; and
(D) pursue its other rights and remedies under the Loan Documents and applicable law. 
 (b) If an Event of Default has
occurred and is continuing: (i) the Agent shall have for the benefit of the Lenders, in addition to all other rights of the Agent and the Lenders, the rights and remedies of a secured party under the Loan Documents and the UCC; (ii) the
Agent may, at any time, take possession of the Collateral and keep it on any Loan Party’s premises, at no cost to the Agent or any Lender, or remove any part of it to such other place or places as the Agent may desire, or the Loan Parties
shall, upon the Agent’s demand, at the Borrowers’ cost, assemble the Collateral and make it available to the Agent at a place reasonably convenient to the Agent; and (iii) the Agent may sell and deliver any Collateral at public or
private sales, for cash, upon credit or otherwise, at such prices and upon such terms as the Agent deems advisable, in its sole discretion, and may, if the Agent deems it reasonable, postpone or adjourn any sale of the

  
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Collateral by an announcement at the time and place of sale or of such postponed or adjourned sale without giving a new notice of sale. Without in any way requiring notice to be given in the
following manner, the Loan Parties agree that any notice by the Agent of sale, disposition, or other intended action hereunder or in connection herewith, whether required by the UCC or otherwise, shall constitute reasonable notice to such Loan Party
if such notice is mailed by registered or certified mail, return receipt requested, postage prepaid, or is delivered personally against receipt, at least five (5) Business Days prior to such action to Westlake’s address specified in or
pursuant to Section 13.8. If any Collateral is sold on terms other than payment in full at the time of sale, no credit shall be given against the Obligations until the Agent or the Lenders receive payment, and if the buyer
defaults in payment, the Agent may resell the Collateral without further notice to any Loan Party. In the event the Agent seeks to take possession of all or any portion of the Collateral by judicial process, the Loan Parties irrevocably waive to the
extent permitted under applicable Law: (A) the posting of any bond, surety, or security with respect thereto which might otherwise be required; (B) any demand for possession prior to the commencement of any suit or action to recover the
Collateral; and (C) any requirement that the Agent retain possession and not dispose of any Collateral until after trial or final judgment. The Loan Parties agree that the Agent has no obligation to preserve rights to the Collateral or marshal
any Collateral for the benefit of any Person. The Agent is hereby granted a license or other right to use, without charge, the Loan Parties’ labels, patents, copyrights, name, trade secrets, trade names, trademarks, and advertising matter, or
any similar property, in advertising or selling any Collateral, and unless the terms and provisions of such rights provide otherwise, in completing production of any Collateral, and the Loan Parties’ rights under all licenses and all franchise
agreements shall inure to the Agent’s benefit for such purpose. The proceeds of sale shall be applied first to all expenses of sale, including attorneys’ fees, and then to the Obligations. The Agent will return any excess to the Borrowers
and the Borrowers shall remain liable for any deficiency. 
 (c) If an Event of Default occurs and is continuing, the Loan
Parties hereby waive, to the extent permitted by applicable law, all rights to notice and hearing prior to the exercise by the Agent of the Agent’s rights to repossess the Collateral without judicial process or to reply, attach or levy upon the
Collateral without notice or hearing. 
 ARTICLE 10. 

TERM AND TERMINATION 
 10.1
Term and Termination. The term of this Agreement shall end on the Stated Termination Date unless sooner terminated in accordance with the terms hereof. The Agent upon direction from the Required Lenders may terminate this Agreement without
notice upon the occurrence of an Event of Default. Upon the effective date of termination of this Agreement for any reason whatsoever, all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding Bank Products that
the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination) shall become immediately due and payable, and the Borrowers shall immediately
make Full Payment of all such Obligations. Notwithstanding the termination of this Agreement, until the Agent has received Full Payment of all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding Bank Products
that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination), the Borrowers shall remain bound by the terms of this Agreement and shall
not be relieved of any of their Obligations hereunder or under any other Loan Document, and the Agent and the Lenders shall retain all their rights and remedies hereunder (including the Agent’s Liens in and all rights and remedies with respect
to all then existing and after-arising Collateral). 

  
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 ARTICLE 11. 

AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS 

11.1 Amendments and Waivers. 

(a) No amendment or waiver of any provision of this Agreement or any other Loan Document, and no consent with respect to any
departure by the Loan Parties therefrom, shall be effective unless the same shall be in writing and signed by (x) the Required Lenders (or by the Agent at the written request of the Required Lenders), or (y) with respect to
(A) increase any of the percentages set forth in the definition of the Borrowing Base or (B) other changes in the definition of Borrowing Base, the Supermajority Lenders (or by the Agent at the written request of the Supermajority
Lenders); and the Borrowers and then any such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given; provided, however, that no such waiver, amendment, or consent shall, unless
in writing and signed by each Lender (including consent of a Defaulting Lender with respect to clauses (i), (ii), and (iii) below) affected thereby and the Borrowers and acknowledged by the Agent, do
any of the following: 
 (i) increase or extend the Commitment of any Lender; 

(ii) postpone or delay any date fixed by this Agreement or any other Loan Document for any payment of principal, interest, fees
(other than fees payable solely to the Agent), or other amounts due to the Lenders (or any of them) hereunder or under any other Loan Document; 

(iii) reduce the principal of, or the rate of interest specified herein on any Loan, or any fees or other amounts payable
hereunder or under any other Loan Document; 
 (iv) change the percentage of the Commitments or of the aggregate unpaid
principal amount of the Revolving Loans which is required for the Lenders or any of them to take any action hereunder; 
 (v)
amend this Section, Section 12.11(b) or any provision of this Agreement providing for consent or other action by all Lenders; provided that consent of each Defaulting Lender shall be required to amend clause
(i), (ii), or (iii) above; 
 (vi) release all or substantially all of the
Obligation Guaranties or release the Collateral other than as permitted by Section 12.10; 
 (vii) change
the definitions of “Supermajority Lenders” or “Required Lenders”; 
 (viii)
change the order of application of payments provisions in Section 3.7; or 
 (ix) increase the Maximum
Revolver Amount or Letter of Credit Subfacility; 
 provided, however, the Agent may, in its sole discretion and notwithstanding the
limitations contained in clause (viii) above (other than the limitations restricting the increase in the Maximum Revolver Amount) and any other terms of this Agreement, make Agent Advances in accordance with
Section 1.2(i) and, provided further, that (A) no amendment, waiver, or consent shall, unless in writing and signed by the Agent, affect the rights or duties of the Agent under this Agreement or any other Loan
Document; (B) no 

  
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 amendment, waiver, or consent shall, unless in writing and signed by the Letter of Credit Issuers, affect the
rights or duties of the Letter of Credit Issuers under this Agreement or any other Loan Document; (C) no amendment shall increase the Commitment of any Lender unless consented to by such Lender (including a Defaulting Lender); and
(D) Schedule 1.2 hereto (Commitments) may be amended from time to time by the Agent alone to reflect assignments of Commitments in accordance herewith. 

(b) If any fees are paid to the Lenders as consideration for amendments, waivers, or consents with respect to this Agreement,
at the Agent’s election, such fees may be paid only to those Lenders that agree to such amendments, waivers or consents within the time specified for submission thereof. 

(c) If, in connection with any proposed amendment, waiver or consent (a “Proposed Change”): 

(i) requiring the consent of all Lenders, the consent of Required Lenders is obtained, but the consent of other Lenders is not
obtained (any such Lender whose consent is not obtained as described in this clause (i) and in clause (ii) below being referred to as a “Non-Consenting Lender”), or 

(ii) requiring the consent of Supermajority Lenders, the consent of Required Lenders is obtained, 

then, so long as the Agent is not a Non-Consenting Lender, at the Borrowers’ request, the Agent or an Eligible Assignee shall have the right (but not the
obligation) with the Agent’s approval, to purchase from the Non-Consenting Lenders, and the Non-Consenting Lenders agree that they shall sell, all the Non-Consenting Lenders’ Commitments for an amount equal to the principal balances
thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such Assignment and
Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan Documents,
including all principal, interest and fees through the date of assignment (but excluding any prepayment charge). 
 11.2 Assignments;
Participations. 
 (a) Any Lender may, with the written consent of the Agent and Westlake, which consent shall not be
unreasonably withheld, assign and delegate to one or more Eligible Assignees (provided that (i) no consent of the Agent or Westlake shall be required in connection with any assignment and delegation by a Lender to an Affiliate of such
Lender, another Lender or an Approved Fund, (ii) Westlake shall be deemed to have consented to any such assignment unless it shall object thereto by written notice to the Agent within five (5) Business Days after having received notice
thereof; and (iii) no consent of Westlake shall be required if an Event of Default has occurred and is continuing at the time of such assignment ) (each an “Assignee”) all, or any ratable part of all, of the Revolving
Loans, the Commitment, and the other rights and obligations of such Lender hereunder, in a minimum amount of $10,000,000, or, if less, all of such Lender’s Commitment (provided that, unless an assignor Lender has assigned and delegated
all of its Loans and Commitment, no such assignment and/or delegation shall be permitted unless, after giving effect thereto, such assignor Lender retains a Commitment in a minimum amount of $10,000,000); provided, however, that the
Borrowers and the Agent may continue to deal solely and directly with such Lender in connection with the interest so assigned to an Assignee until (i) written notice of such assignment, together with payment instructions, addresses and related

  
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information with respect to the Assignee, shall have been given to the Borrowers and the Agent by such Lender and the Assignee; (ii) such Lender and its Assignee shall have delivered to the
Borrowers and the Agent an Assignment and Acceptance in the form of Exhibit F or otherwise satisfactory to the Agent (“Assignment and Acceptance”) together with any note or notes, if any, subject to such
assignment, and (iii) the assignor Lender or Assignee has paid to the Agent a processing fee in the amount of $3,500. The Borrowers agree to promptly execute and deliver new promissory notes and replacement promissory notes if requested by an
Assignee or assignor Lender to evidence assignments of the Revolving Loans and Commitments in accordance herewith. 
 (b)
From and after the date that the Agent notifies the assignor Lender that it has received an executed Assignment and Acceptance (and consent of the Agent thereto, if required) and payment of the above-referenced processing fee, (i) the Assignee
thereunder shall be a party hereto and, to the extent that rights and obligations, including, but not limited to, the obligation to participate in Letters of Credit and Credit Support have been assigned to it pursuant to such Assignment and
Acceptance, shall have the rights and obligations of a Lender under the Loan Documents (except for such rights and obligations not available to such assignee by express terms of this Agreement), and (ii) the assignor Lender shall, to the extent
that rights and obligations hereunder and under the other Loan Documents have been assigned by it pursuant to such Assignment and Acceptance, relinquish its rights and be released from its obligations under this Agreement (and in the case of an
Assignment and Acceptance covering all or the remaining portion of an assigning Lender’s rights and obligations under this Agreement, such Lender shall cease to be a party hereto). 

(c) By executing and delivering an Assignment and Acceptance, the assigning Lender thereunder and the Assignee thereunder
confirm to and agree with each other and the other parties hereto as follows: (i) other than as provided in such Assignment and Acceptance, such assigning Lender makes no representation or warranty and assumes no responsibility with respect to
any statements, warranties, or representations made in or in connection with this Agreement or the execution, legality, validity, enforceability, genuineness, sufficiency, or value of this Agreement or any other Loan Document furnished pursuant
hereto or the attachment, perfection, or priority of any Lien granted by any Loan Party to the Agent or any Lender in the Collateral; (ii) such assigning Lender makes no representation or warranty and assumes no responsibility with respect to
the financial condition of any Loan Party or the performance or observance by any Loan Party of any of its obligations under this Agreement or any other Loan Document furnished pursuant hereto; (iii) such Assignee confirms that it has received
a copy of this Agreement, together with such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into such Assignment and Acceptance; (iv) such Assignee will, independently (without
reliance upon the Agent, such assigning Lender, or any other Lender, and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit decisions in taking or not taking action under this
Agreement; (v) such Assignee appoints and authorizes the Agent to take such action as agent on its behalf and to exercise such powers under this Agreement as are delegated to the Agent by the terms hereof, together with such powers, including
the discretionary rights and incidental power, as are reasonably incidental thereto; and (vi) such Assignee agrees that it will perform in accordance with their terms all of the obligations which by the terms of this Agreement are required to
be performed by it as a Lender. 
 (d) Immediately upon satisfaction of the requirements of
Section 11.2(a), this Agreement shall be deemed to be amended to the extent, but only to the extent, necessary to reflect the addition of the Assignee and the resulting adjustment of the Commitments arising therefrom. The
Commitment allocated to each Assignee shall reduce such Commitments of the assigning Lender pro tanto. 

  
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 (e) Any Lender may at any time sell to one or more commercial banks, financial
institutions, or other Persons not Affiliates of any Borrower (a “Participant”) participating interests in any Loans, the Commitment of that Lender and the other interests of that Lender (the “Originating
Lender”) hereunder and under the other Loan Documents; provided, however, that (i) the Originating Lender’s obligations under this Agreement shall remain unchanged; (ii) the Originating Lender shall remain
solely responsible for the performance of such obligations; (iii) the Borrowers and the Agent shall continue to deal solely and directly with the Originating Lender in connection with the Originating Lender’s rights and obligations under
this Agreement and the other Loan Documents; and (iv) no Lender shall transfer or grant any participating interest under which the Participant has rights to approve any amendment to, or any consent or waiver with respect to, this Agreement or
any other Loan Document, except the matters set forth in Section 11.1(a)(i), (ii), and (iii), and all amounts payable by the Loan Parties hereunder shall be determined as if such Lender had not sold
such participation; except that, if amounts outstanding under this Agreement are due and unpaid, or shall have become due and payable upon the occurrence of an Event of Default, each Participant shall be deemed to have the right of set off in
respect of its participating interest in amounts owing under this Agreement to the same extent and subject to the same limitation as if the amount of its participating interest were owing directly to it as a Lender under this Agreement. 

(f) If at any time any Lender which has issued any Letters of Credit which remain outstanding, assigns all of its Commitment,
it shall retain all the rights, powers, privileges, and duties of a Letter of Credit Issuer hereunder with respect to all Letters of Credit outstanding as of the effective date of its assignment of its Commitment and all Letter-of Credit Rights with
respect thereto (including the right to require the Lenders to make Base Rate Loans pursuant to Section 1.3). In the event any other Lender issues any Letter of Credit in substitution for any outstanding Letter of Credit issued by
any Lender which ceases to be a Lender hereunder, the successor Letter of Credit Issuer shall succeed to the rights and obligations of the original Letter of Credit Issuer. 

(g) Notwithstanding any other provision in this Agreement, any Lender may at any time create a security interest in, or pledge,
all or any portion of its rights under and interest in this Agreement in favor of any Federal Reserve Bank in accordance with Regulation A of the FRB or U.S. Treasury Regulation 31 CFR §203.14, or any other central bank having jurisdiction over
such Lender, and such Federal Reserve Bank or other central bank having jurisdiction over such Lender may enforce such pledge or security interest in any manner permitted under applicable law. 

(h) No assignment or participation may be made to a Borrower, Affiliate of a Borrower, Defaulting Lender or natural person. In
connection with any assignment by a Defaulting Lender, such assignment shall be effective only upon payment by the Eligible Assignee or Defaulting Lender to the Agent of an aggregate amount sufficient, upon distribution (through direct payment,
purchases of participations or other compensating actions as the Agent deems appropriate), (a) to satisfy all funding and payment liabilities then owing by the Defaulting Lender hereunder, and (b) to acquire its Pro Rata Share of all
Revolving Loans and Letter of Credit Obligations. If an assignment by a Defaulting Lender shall become effective under applicable Requirement of Law for any reason without compliance with the foregoing sentence, then the assignee shall be deemed a
Defaulting Lender for all purposes until such compliance occurs. 

  
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 (i) Each Lender that sells a participation shall, acting as a non-fiduciary agent
of Borrowers (solely for tax purposes), maintain a register in which it enters the Participant’s name, address and interest in Commitments, Loans (and stated interest) and Letter-of Credit Rights. Entries in the register shall be conclusive,
absent manifest error, and such Lender shall treat each Person recorded in the register as the owner of the participation for all purposes, notwithstanding any notice to the contrary. No Lender shall have an obligation to disclose any information in
such register except to the extent necessary to establish that a Participant’s interest is in registered form under the Code. 

ARTICLE 12. 
 THE AGENT

 12.1 Appointment and Authorization. Each Lender hereby designates and appoints the Bank as its Agent under this Agreement and
the other Loan Documents and each Lender hereby irrevocably authorizes the Agent to take such action on its behalf under the provisions of this Agreement and each other Loan Document and to exercise such powers and perform such duties as are
expressly delegated to it by the terms of this Agreement or any other Loan Document, together with such powers as are reasonably incidental thereto. The Agent agrees to act as such on the express conditions contained in this Article
12. The provisions of this Article 12 are solely for the benefit of the Agent and the Lenders and no Borrower shall have any rights as a third party beneficiary of any of the provisions contained herein. Notwithstanding any
provision to the contrary contained elsewhere in this Agreement or in any other Loan Document, the Agent shall not have any duties or responsibilities, except those expressly set forth herein, nor shall the Agent have or be deemed to have any
fiduciary relationship with any Lender, and no implied covenants, functions, responsibilities, duties, obligations or liabilities shall be read into this Agreement or any other Loan Document or otherwise exist against the Agent. Without limiting the
generality of the foregoing sentence, the use of the term “agent” in this Agreement with reference to the Agent is not intended to connote any fiduciary or other implied (or express) obligations arising under agency doctrine of any
applicable law. Instead, such term is used merely as a matter of market custom, and is intended to create or reflect only an administrative relationship between independent contracting parties. Except as expressly otherwise provided in this
Agreement, the Agent shall have and may use its sole discretion with respect to exercising or refraining from exercising any discretionary rights or taking or refraining from taking any actions which the Agent is expressly entitled to take or assert
under this Agreement and the other Loan Documents, including (a) the determination of the applicability of ineligibility criteria with respect to the calculation of the Borrowing Base, (b) the making of Agent Advances pursuant to
Section 1.2(i), and (c) the exercise of remedies pursuant to Section 9.2, and any action so taken or not taken shall be deemed consented to by the Lenders. 

12.2 Delegation of Duties. The Agent may execute any of its duties under this Agreement or any other Loan Document by or through
agents, employees, or attorneys in fact and shall be entitled to advice of counsel concerning all matters pertaining to such duties. The Agent shall not be responsible for the negligence or misconduct of any agent or attorney in fact that it selects
as long as such selection was made without gross negligence or willful misconduct. 
 12.3 Liability of Agent. None of the Agent
Related Persons shall (a) be liable for any action taken or omitted to be taken by any of them under or in connection with this Agreement or any other Loan Document or the transactions contemplated hereby (except for its own gross negligence or
willful misconduct), or (b) be responsible in any manner to any of the Lenders for any recital, statement, representation, or warranty made by any Borrower, any Affiliate of any Borrower, or any officer thereof, contained in this Agreement or
in any other Loan Document, or in any certificate, report, statement or other document referred to or provided for in, or received by the Agent under or in connection with, this Agreement or any other Loan Document, or the validity, effectiveness,
genuineness, enforceability, or 

  
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sufficiency of this Agreement or any other Loan Document, or for any failure of any Borrower or any other party to any Loan Document to perform its obligations hereunder or thereunder. No Agent
Related Person shall be under any obligation to any Lender to ascertain or to inquire as to the observance or performance of any of the agreements contained in, or conditions of, this Agreement or any other Loan Document, or to inspect the
properties, books, or records of any Borrower or any Affiliates of any Borrower. 
 12.4 Reliance by Agent. The Agent shall be
entitled to rely, and shall be fully protected in relying, upon any writing, resolution, notice, consent, certificate, affidavit, letter, telegram, facsimile, telex or telephone message, statement or other document, or conversation believed by it to
be genuine and correct and to have been signed, sent, or made by the proper Person or Persons, and upon advice and statements of legal counsel (including counsel to any Borrower), independent accountants and other experts selected by the Agent. The
Agent shall be fully justified in failing or refusing to take any action under this Agreement or any other Loan Document unless it shall first receive such advice or concurrence of the Required Lenders as it deems appropriate and, if it so requests,
it shall first be indemnified to its satisfaction by the Lenders against any and all liability and expense which may be incurred by it by reason of taking or continuing to take any such action. The Agent shall in all cases be fully protected in
acting, or in refraining from acting, under this Agreement or any other Loan Document in accordance with a request or consent of the Required Lenders (or all Lenders if so required by Section 11.1) and such request and any action
taken or failure to act pursuant thereto shall be binding upon all of the Lenders. 
 12.5 Notice of Default. The Agent shall not be
deemed to have knowledge or notice of the occurrence of any Default or Event of Default, unless the Agent shall have received written notice from a Lender or the Borrowers referring to this Agreement, describing such Default or Event of Default and
stating that such notice is a “notice of default.” The Agent will notify the Lenders of its receipt of any such notice. The Agent shall take such action with respect to such Default or Event of Default as may be requested by the
Required Lenders in accordance with Section 9; provided, however, that unless and until the Agent has received any such request, the Agent may (but shall not be obligated to) take such action, or refrain from taking
such action, with respect to such Default or Event of Default as it shall deem advisable. 
 12.6 Credit Decision. Each Lender
acknowledges that none of the Agent Related Persons has made any representation or warranty to it, and that no act by the Agent hereinafter taken, including any review of the affairs of the Borrowers and their Affiliates, shall be deemed to
constitute any representation or warranty by any Agent-Related Person to any Lender. Each Lender represents to the Agent that it has, independently (without reliance upon any Agent-Related Person and based on such documents and information as it has
deemed appropriate), made its own appraisal of and investigation into the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrowers and their Affiliates, and all applicable bank regulatory laws
relating to the transactions contemplated hereby, and made its own decision to enter into this Agreement and to extend credit to the Borrowers. Each Lender also represents that it will, independently (without reliance upon any Agent-Related Person
and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit analysis, appraisals, and decisions in taking or not taking action under this Agreement and the other Loan Documents, and to make
such investigations as it deems necessary to inform itself as to the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrowers. Except for notices, reports, and other documents expressly herein
required to be furnished to the Lenders by the Agent, the Agent shall not have any duty or responsibility to provide any Lender with any credit or other information concerning the business, prospects, operations, property, financial and other
condition, or creditworthiness of the Borrowers which may come into the possession of any of the Agent Related Persons. 

  
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 12.7 Indemnification. Whether or not the transactions contemplated hereby are consummated,
the Lenders shall indemnify upon demand the Agent Related Persons (to the extent not reimbursed by or on behalf of the Borrowers and without limiting the obligation of the Borrowers to do so), in accordance with their Pro Rata Shares, from and
against any and all Indemnified Liabilities as such term is defined in Section 13.11; provided, however, that no Lender shall be liable for the payment to the Agent Related Persons of any portion of such Indemnified
Liabilities resulting solely from such Person’s gross negligence or willful misconduct. Without limitation of the foregoing, each Lender shall reimburse the Agent upon demand for its Pro Rata Share of any costs or out of pocket expenses
(including Attorney Costs) incurred by the Agent in connection with the preparation, execution, delivery, administration, modification, amendment, or enforcement (whether through negotiations, legal proceedings, or otherwise) of, or legal advice in
respect of rights or responsibilities under, this Agreement, any other Loan Document, or any document contemplated by or referred to herein, to the extent that the Agent is not reimbursed for such expenses by or on behalf of the Borrowers. The
undertaking in this Section 12.7 shall survive the payment of all Obligations hereunder and the resignation or replacement of the Agent. 

12.8 Agent in Individual Capacity. The Bank and its Affiliates may make loans to, issue letters of credit for the account of, accept
deposits from, acquire Capital Stock in and generally engage in any kind of banking, trust, financial advisory, underwriting, or other business with the Borrowers and their Affiliates as though the Bank were not the Agent hereunder and without
notice to or consent of the Lenders. The Bank or its Affiliates may receive information regarding the Borrowers, their Affiliates and Account Debtors (including information that may be subject to confidentiality obligations in favor of the
Borrowers, Affiliates, or Account Debtors) and acknowledge that the Agent and the Bank shall be under no obligation to provide such information to them. With respect to its Revolving Loans, the Bank shall have the same rights and powers under this
Agreement as any other Lender and may exercise the same as though it were not the Agent, and the terms “Lender” and “Lenders” include the Bank in its individual capacity. 

12.9 Successor Agent. The Agent may resign as Agent upon at least thirty (30) days prior notice to the Lenders and the Borrowers,
such resignation to be effective upon the acceptance of a successor agent to its appointment as Agent. In the event the Bank sells all of its Commitment and Revolving Loans as part of a sale, transfer or other disposition by the Bank of
substantially all of its loan portfolio, the Bank shall resign as Agent and such purchaser or transferee shall become the successor Agent hereunder. Subject to the foregoing, if the Agent resigns under this Agreement, the Required Lenders shall
appoint from among the Lenders a successor agent for the Lenders. If no successor agent is appointed prior to the effective date of the resignation of the Agent, the Agent may appoint, after consulting with the Lenders and Westlake, a successor
agent from among the Lenders or, if no Lender accepts such role, the Agent may appoint Required Lenders as successor Agent. Upon the acceptance of its appointment as successor agent hereunder, or upon appointment of Required Lenders as successor
Agent, (a) such successor agent shall succeed to all the rights, powers, and duties of the retiring Agent, (b) the term “Agent” shall mean such successor agent, (c) the retiring Agent’s appointment,
powers, and duties as Agent shall be terminated. After any retiring Agent’s resignation hereunder as Agent, the provisions of this Article 12 shall continue to inure to its benefit as to any actions taken or omitted to be taken by
it while it was Agent under this Agreement. 
 12.10 Collateral Matters. 

(a) The Lenders hereby irrevocably authorize the Agent, at its option and in its sole discretion, to release any Agent’s
Liens upon any Collateral (i) upon the termination of the Commitments and Full Payment of the Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of
this Agreement and are not due and payable at such termination); (ii) constituting property being sold 

  
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or disposed of if the Borrowers certify to the Agent that the sale or disposition is made in compliance with Section 7.9 (and the Agent may rely conclusively on any such
certificate, without further inquiry); (iii) constituting property that is not Collateral in which the Loan Parties owned no interest at the time the Lien was granted or at any time thereafter; (iv) constituting property leased to the Loan
Parties under a lease which has expired or been terminated in a transaction permitted under this Agreement; or (v) owned by a Guarantor or a Borrower (other than Westlake), upon the release of such Guarantor or Borrower from its Obligations in
accordance with Section 12.10(d). Except as provided above, the Agent will not release any of the Agent’s Liens without the prior written authorization of the Lenders; provided that the Agent may, in its discretion,
release the Agent’s Liens on Collateral valued in the aggregate not in excess of $5,000,000 during each Fiscal Year without the prior written authorization of the Lenders and the Agent may release the Agent’s Liens on Collateral valued in
the aggregate not in excess of $10,000,000 during each Fiscal Year with the prior written authorization of Required Lenders. Upon request by the Agent or the Borrowers at any time, the Lenders will confirm in writing the Agent’s authority to
release any Agent’s Liens upon particular types or items of Collateral pursuant to this Section 12.10. 

(b) Upon receipt by the Agent of any authorization required pursuant to Section 12.10(a) from the Lenders of
the Agent’s authority to release the Agent’s Liens upon particular types or items of Collateral, and upon at least five (5) Business Days’ prior written request by the Borrowers, the Agent shall (and is hereby irrevocably
authorized by the Lenders to) execute such documents as may be necessary to evidence the release of the Agent’s Liens upon such Collateral; provided, however, that (i) the Agent shall not be required to execute any such
document on terms which, in the Agent’s opinion, would expose the Agent to liability or create any obligation or entail any consequence other than the release of such Liens without recourse or warranty, and (ii) such release shall not in
any manner discharge, affect or impair the Obligations or any Liens (other than those expressly being released) upon (or obligations of any Loan Party in respect of) all interests retained by any Loan Party, including the proceeds of any sale, all
of which shall continue to constitute part of the Collateral. 
 (c) The Agent shall have no obligation whatsoever to any of
the Lenders to assure that the Collateral exists or is owned by any Loan Party or is cared for, protected, or insured or has been encumbered, or that the Agent’s Liens have been properly or sufficiently or lawfully created, perfected,
protected, or enforced or are entitled to any particular priority, or to exercise at all or in any particular manner or under any duty of care, disclosure, or fidelity, or to continue exercising, any of the rights, authorities, and powers granted or
available to the Agent pursuant to any of the Loan Documents, it being understood and agreed that in respect of the Collateral, or any act, omission, or event related thereto, the Agent may act in any manner it may deem appropriate, in its sole
discretion given the Agent’s own interest in the Collateral in its capacity as one of the Lenders and that the Agent shall have no other duty or liability whatsoever to any Lender as to any of the foregoing. 

(d) The Lenders hereby irrevocably authorize the Agent to release a Guarantor or Borrower (other than Westlake) from its
Security Agreement and Obligation Guaranty and any other Obligations: 
 (i) in connection with any sale or other disposition
of all or substantially all of the properties or assets of that Loan Party (including by way of merger or consolidation) to a Person that is not (either before or after giving effect to such transaction) Westlake or a Material Domestic Subsidiary of
Westlake, if the sale or other disposition otherwise complies with this Agreement and such Loan Party ceases to be a Material Domestic Subsidiary of Westlake as a result of the sale or other disposition; 

  
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 (ii) in connection with any sale or other disposition of Capital Stock of that
Loan Party to a Person that is not (either before or after giving effect to such transaction) Westlake or a Restricted Subsidiary of Westlake, if the sale or other disposition otherwise complies with this Agreement and such Loan Party ceases to be a
Restricted Subsidiary of Westlake as a result of the sale or other disposition; 
 (iii) if Westlake designates such Loan
Party to be an Unrestricted Subsidiary in accordance with the applicable provisions of this Agreement; 
 (iv) upon the
liquidation or dissolution of such Loan Party in compliance with this Agreement; 
 (v) upon Westlake’s written request,
at such time as such Loan Party ceases to be (or is not otherwise) a Material Domestic Subsidiary; and 
 (vi) upon such Loan
Party consolidating with, merging into or transferring all of its properties or assets to Westlake or another Loan Party, if such transaction complies with this Agreement and as a result of, or in connection with, such transaction, such Loan Party
is dissolved or otherwise ceases to exist. 
 12.11 Restrictions on Actions by Lenders; Sharing of Payments. 

(a) Each of the Lenders agrees that it shall not, unless specifically requested to do so by the Agent, take or cause to be
taken any action to enforce its rights under this Agreement or against any Loan Party, including the commencement of any legal or equitable proceedings, to foreclose any Lien on, or otherwise enforce any security interest in, any of the Collateral.

 (b) If at any time or times any Lender shall receive (i) by payment, foreclosure, setoff, or otherwise, any proceeds
of Collateral or any payments with respect to the Obligations of any Loan Party to such Lender arising under, or relating to, this Agreement or the other Loan Documents, except for any such proceeds or payments received by such Lender from the Agent
pursuant to the terms of this Agreement, or (ii) payments from the Agent in excess of such Lender’s ratable portion of all such distributions by the Agent, such Lender shall promptly (1) turn the same over to the Agent, in kind, and
with such endorsements as may be required to negotiate the same to the Agent, or in same day funds, as applicable, for the account of all of the Lenders and for application to the Obligations in accordance with the applicable provisions of this
Agreement, or (2) purchase, without recourse or warranty, an undivided interest and participation in the Obligations owed to the other Lenders so that such excess payment received shall be applied ratably as among the Lenders in accordance with
their Pro Rata Shares; provided, however, that if all or part of such excess payment received by the purchasing party is thereafter recovered from it, those purchases of participations shall be rescinded in whole or in part, as
applicable, and the applicable portion of the purchase price paid therefor shall be returned to such purchasing party, but without interest except to the extent that such purchasing party is required to pay interest in connection with the recovery
of the excess payment. Notwithstanding the foregoing, if a Defaulting Lender obtains a payment or reduction of any Obligation, it shall immediately turn over the amount thereof to the Agent for application under Section 12.14(e)
and it shall provide a written statement to the Agent describing the Obligation affected by such payment or reduction. 

  
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 12.12 Agency for Perfection. Each Lender hereby appoints each other Lender as agent for
the purpose of perfecting the Lenders’ security interest in assets which, in accordance with Article 9 of the UCC can be perfected only by possession or control. Should any Lender (other than the Agent) obtain possession or control of any such
Collateral, such Lender shall notify the Agent thereof, and, promptly upon the Agent’s request therefor shall deliver such Collateral or control thereof to the Agent or in accordance with the Agent’s instructions. 

12.13 Payments by Agent to Lenders. All payments to be made by the Agent to the Lenders shall be made by bank wire transfer or internal
transfer of immediately available funds to each Lender pursuant to wire transfer instructions delivered in writing to the Agent on or prior to the Closing Date (or if such Lender is an Assignee, on the applicable Assignment and Acceptance), or
pursuant to such other wire transfer instructions as each party may designate for itself by written notice to the Agent. Concurrently with each such payment, the Agent shall identify whether such payment (or any portion thereof) represents
principal, premium, or interest on the Revolving Loans or otherwise. Unless the Agent receives notice from the Borrowers prior to the date on which any payment is due to the Lenders that the Borrowers will not make such payment in full as and when
required, the Agent may assume that the Borrowers have made such payment in full to the Agent on such date in immediately available funds and the Agent may (but shall not be so required), in reliance upon such assumption, distribute to each Lender
on such due date an amount equal to the amount then due such Lender. If and to the extent the Borrowers have not made such payment in full to the Agent, each Lender shall repay to the Agent on demand such amount distributed to such Lender, together
with interest thereon at the Federal Funds Rate for each day from the date such amount is distributed to such Lender until the date repaid. 

12.14 Settlement. 

(a) Each Lender’s funded portion of the Revolving Loans is intended by the Lenders to be equal at all times to such
Lender’s Pro Rata Share of the outstanding Revolving Loans. Notwithstanding such agreement, the Agent, the Bank, and the other Lenders agree (which agreement shall not be for the benefit of or enforceable by any Borrower) that in order to
facilitate the administration of this Agreement and the other Loan Documents, settlement among them as to the Revolving Loans, the Non-Ratable Loans and the Agent Advances shall take place on a periodic basis
in accordance with the following provisions: 
 (i) The Agent shall request settlement (“Settlement”)
with the Lenders on at least a weekly basis, or on a more frequent basis at the Agent’s election, (A) on behalf of the Bank, with respect to each outstanding Non-Ratable Loan, (B) for itself, with respect to each Agent Advance, and
(C) with respect to collections received, in each case, by notifying the Lenders of such requested Settlement by telecopy, telephone or other similar form of transmission, of such requested Settlement, no later than 1:30 p.m. (Houston, Texas
time) on the date of such requested Settlement (the “Settlement Date”). Each Lender (other than the Bank, in the case of Non-Ratable Loans and the Agent in the case of Agent Advances) shall transfer the amount of such
Lender’s Pro Rata Share of the outstanding principal amount of the Non-Ratable Loans and Agent Advances with respect to each Settlement to the Agent, to the Agent’s account, not later than 3:30 p.m. (Houston, Texas time), on the Settlement
Date applicable thereto. Settlements may occur during the continuation of a Default or an Event of Default and whether or not the applicable conditions precedent set forth in Article 8 have then been satisfied. Such amounts made
available to the Agent shall be applied against the amounts of the applicable Non-Ratable Loan or Agent Advance and, together with the portion of such Non-Ratable Loan or Agent Advance representing the Bank’s Pro Rata Share thereof, shall
constitute Revolving Loans of such Lenders. If any such amount is not transferred 

  
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to the Agent by any Lender on the Settlement Date applicable thereto, the Agent shall be entitled to recover such amount on demand from such Lender together with interest thereon at the Federal
Funds Rate for the first three (3) days from and after the Settlement Date and thereafter at the Interest Rate then applicable to the Revolving Loans (A) on behalf of the Bank, with respect to each outstanding Non-Ratable Loan, and
(B) for itself, with respect to each Agent Advance. If any settlement amount is not transferred to the Agent by any Lender on the Business Day after demand, the Agent will notify the Borrowers of such Lender’s failure to transfer and, upon
demand by the Agent, the Borrowers shall pay such amount to the Agent, together with interest thereon for each day elapsed since the date of the applicable advance, at a rate per annum equal to the Interest Rate applicable at the time to the
Revolving Loans comprising that particular advance. 
 (ii) Notwithstanding the foregoing, not more than one
(1) Business Day after demand is made by the Agent (whether before or after the occurrence of a Default or an Event of Default and regardless of whether the Agent has requested a Settlement with respect to a Non-Ratable Loan or Agent Advance),
each other Lender (A) shall irrevocably and unconditionally purchase and receive from the Bank or the Agent, as applicable, without recourse or warranty, an undivided interest and participation in such Non-Ratable Loan or Agent Advance equal to
such Lender’s Pro Rata Share of such Non-Ratable Loan or Agent Advance and (B) if Settlement has not previously occurred with respect to such Non-Ratable Loans or Agent Advances, upon demand by Bank or the Agent, as applicable, shall pay
to Bank or the Agent, as applicable, as the purchase price of such participation an amount equal to one-hundred percent (100%) of such Lender’s Pro Rata Share of such Non-Ratable Loans or Agent Advances. If such amount is not in fact made
available to the Agent by any Lender, the Agent shall be entitled to recover such amount on demand from such Lender together with interest thereon at the Federal Funds Rate for the first three (3) days from and after such demand and thereafter
at the Interest Rate then applicable to Base Rate Loans. 
 (iii) From and after the date, if any, on which any Lender
purchases an undivided interest and participation in any Non-Ratable Loan or Agent Advance pursuant to clause (ii) above, the Agent shall promptly distribute to such Lender, such Lender’s Pro Rata Share of all payments of
principal and interest and all proceeds of Collateral received by the Agent in respect of such Non-Ratable Loan or Agent Advance. 

(iv) Between Settlement Dates, the Agent, to the extent no Agent Advances are outstanding, may pay over to the Bank any
payments received by the Agent, which in accordance with the terms of this Agreement would be applied to the reduction of the Revolving Loans, for application to the Bank’s Revolving Loans including Non-Ratable Loans. If, as of any Settlement
Date, collections received since the then immediately preceding Settlement Date have been applied to the Bank’s Revolving Loans (other than to Non-Ratable Loans or Agent Advances in which such Lender has not yet funded its purchase of a
participation pursuant to clause (ii) above), as provided for in the previous sentence, the Bank shall pay to the Agent for the accounts of the Lenders, to be applied to the outstanding Revolving Loans of such Lenders, an amount
such that each Lender shall, upon receipt of such amount, have, as of such Settlement Date, its Pro Rata Share of the Revolving Loans. During the period between Settlement Dates, the Bank with respect to Non-Ratable Loans, the Agent with respect to
Agent Advances, and each Lender with respect to the Revolving Loans other than Non-Ratable Loans and Agent Advances, shall be entitled to interest at the applicable rate or rates payable under this Agreement on the actual average daily amount of
funds employed by the Bank, the Agent, and the other Lenders, respectively. 

  
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 (v) Unless the Agent has received written notice from a Lender to the contrary,
the Agent may assume that the applicable conditions precedent set forth in Article 8 have been satisfied and the requested Borrowing will not exceed Availability on any Funding Date for a Revolving Loan or Non-Ratable Loan. 

(b) Lenders’ Failure to Perform. All Revolving Loans (other than Non-Ratable Loans and Agent Advances) shall be
made by the Lenders simultaneously and in accordance with their Pro Rata Shares. It is understood that (i) no Lender shall be responsible for any failure by any other Lender to perform its obligation to make any Revolving Loans hereunder, nor
shall any Commitment of any Lender be increased or decreased as a result of any failure by any other Lender to perform its obligation to make any Revolving Loans hereunder, (ii) no failure by any Lender to perform its obligation to make any
Revolving Loans hereunder shall excuse any other Lender from its obligation to make any Revolving Loans hereunder, and (iii) the obligations of each Lender hereunder shall be several, not joint and several. 

(c) Defaulting Lenders. Unless the Agent receives notice from a Lender on or prior to the Closing Date or, with respect
to any Borrowing after the Closing Date, at least one (1) Business Day prior to the date of such Borrowing, that such Lender will not make available as and when required hereunder to the Agent that Lender’s Pro Rata Share of a Borrowing,
the Agent may assume that each Lender has made such amount available to the Agent in immediately available funds on the Funding Date. Furthermore, the Agent may, in reliance upon such assumption, make available to the Borrowers on such date a
corresponding amount. If any Lender has not transferred its full Pro Rata Share to the Agent in immediately available funds and the Agent has transferred corresponding amount to the Borrowers on the Business Day following such Funding Date, that
Lender shall make such amount available to the Agent, together with interest at the Federal Funds Rate for that day. A notice by the Agent submitted to any Lender with respect to amounts owing shall be conclusive, absent manifest error. If each
Lender’s full Pro Rata Share is transferred to the Agent as required, the amount transferred to the Agent shall constitute that Lender’s Revolving Loan for all purposes of this Agreement. If that amount is not transferred to the Agent on
the Business Day following the Funding Date, the Agent will notify the Borrowers of such failure to fund and, upon demand by the Agent, the Borrowers shall pay such amount to the Agent for the Agent’s account, together with interest thereon for
each day elapsed since the date of such Borrowing, at a rate per annum equal to the Interest Rate applicable at the time to the Revolving Loans comprising that particular Borrowing. The failure of any Lender to make any Revolving Loan on any Funding
Date shall not relieve any other Lender of its obligation hereunder to make a Revolving Loan on that Funding Date. No Lender shall be responsible for any other Lender’s failure to advance such other Lenders’ Pro Rata Share of any
Borrowing. 
 (d) Reallocation of Pro Rata Share; Amendments. For purposes of determining Lenders’ obligations to
fund or participate in the Revolving Loans or Letters of Credit, the Agent may exclude the Commitments and Revolving Loans of any Defaulting Lender(s) from the calculation of Pro Rata Shares. A Defaulting Lender shall have no right to vote on any
amendment, waiver or other modification of a Loan Document, except as provided in Section 11.1. 
 (e)
Payments; Fees. The Agent may, in its discretion, receive and retain any amounts payable to a Defaulting Lender under the Loan Documents, and a Defaulting Lender 

  
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shall be deemed to have assigned to the Agent such amounts until all Obligations owing to the Agent, non-Defaulting Lenders and other Secured Parties have been paid in full. The Agent may apply
such amounts to the Defaulting Lender’s defaulted obligations, use the funds to cash collateralize such Lender’s Fronting Exposure, or readvance the amounts to the Borrowers hereunder. A Lender shall not be entitled to receive any fees
accruing hereunder during the period in which it is a Defaulting Lender, and the unfunded portion of its Commitment shall be disregarded for purposes of calculating the unused line fee under Section 2.5. If any Letter of Credit
Obligations owing to a Defaulted Lender are reallocated to other Lenders, fees attributable to such Letter of Credit Obligations under Section 2.6 shall be paid to such Lenders. The Agent shall be paid all fees attributable to the
Letter of Credit Obligations that are not reallocated. 
 (f) Cure. The Borrowers, the Agent and the Letter of Credit
Issuers may agree in writing that a Lender is no longer a Defaulting Lender. At such time, Pro Rata Shares shall be reallocated without exclusion of such Lender’s Commitments and Revolving Loans, and all outstanding Revolving Loans, Letter of
Credit Obligations and other exposures hereunder shall be reallocated among the Lenders and settled by the Agent (with appropriate payments by the reinstated Lender) in accordance with the readjusted Pro Rata Shares. Unless expressly agreed by the
Borrowers, the Agent and the Letter of Credit Issuers, no reinstatement of a Defaulting Lender shall constitute a waiver or release of claims against such Lender. The failure of any Lender to fund a Revolving Loan, to make a payment in respect of
Letter of Credit Obligations or otherwise to perform its obligations hereunder shall not relieve any other Lender of its obligations, and no Lender shall be responsible for default by another Lender. 

12.15 Concerning the Collateral and the Related Loan Documents. Each Lender authorizes and directs the Agent to enter into the other
Loan Documents, for the ratable benefit and obligation of the Agent and the Lenders, and to amend the Schedules to the Loan Documents without a separate amendment to this Agreement or the other Loan Documents signed by the requisite Lenders if the
underlying transactions necessitating such amendments of the Schedules are permitted under this Agreement or the other Loan Documents. Each Lender agrees that any action taken by the Agent, Supermajority Lenders, or Required Lenders, as applicable,
in accordance with the terms of this Agreement or the other Loan Documents, and the exercise by the Agent, the Supermajority Lenders, or the Required Lenders, as applicable, of their respective powers set forth therein or herein, together with such
other powers that are reasonably incidental thereto, shall be binding upon all of the Lenders. The Lenders acknowledge that the Revolving Loans, Agent Advances, Non-Ratable Loans, Bank Products, and all interest, fees and expenses hereunder
constitute one Debt, secured pari passu by all of the Collateral. 
 12.16 Field Audit and Examination Reports; Disclaimer by
Lenders. By signing this Agreement, each Lender: 
 (a) is deemed to have requested that the Agent furnish such Lender,
promptly after it becomes available, a copy of each field audit or examination report (each a “Report” and collectively, “Reports”) prepared by or on behalf of the Agent; 

(b) expressly agrees and acknowledges that neither the Bank nor the Agent (i) makes any representation or warranty as to
the accuracy of any Report, or (ii) shall be liable for any information contained in any Report; 
 (c) expressly agrees
and acknowledges that the Reports are not comprehensive audits or examinations, that the Agent or the Bank or other party performing any audit or examination will inspect only specific information regarding the Borrowers and will rely significantly
upon the Borrowers’ books and records, as well as on representations of the Borrowers’ personnel; 

  
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 (d) agrees to keep all Reports confidential and strictly for its internal use,
and not to distribute except to its participants, or use any Report in any other manner; and 
 (e) without limiting the
generality of any other indemnification provision contained in this Agreement, agrees: (i) to hold the Agent and any such other Lender preparing a Report harmless from any action the indemnifying Lender may take or conclusion the indemnifying
Lender may reach or draw from any Report in connection with any loans or other credit accommodations that the indemnifying Lender has made or may make to the Borrowers, or the indemnifying Lender’s participation in, or the indemnifying
Lender’s purchase of, a loan or loans of the Borrower; and (ii) to pay and protect, and indemnify, defend and hold the Agent and any such other Lender preparing a Report harmless from and against, the claims, actions, proceedings, damages,
costs, expenses, and other amounts (including Attorney Costs) incurred by the Agent and any such other Lender preparing a Report as the direct or indirect result of any third parties who might obtain all or part of any Report through the
indemnifying Lender. 
 12.17 Relation Among Lenders. The Lenders are not partners or co-venturers, and no Lender shall be liable for
the acts or omissions of, or (except as otherwise set forth herein in case of the Agent) authorized to act for, any other Lender. No Lender or any Affiliate of any Lender that obtains the benefits of Section 7.23 by virtue of the
provisions hereof or of any Guaranty or Security Agreement, shall have the right to notice of any action or to consent to, direct or object to any action hereunder or under any other Loan Document or otherwise in respect of the Collateral (including
the release or impairment of any Collateral) other than in its capacity as a Lender and, in such case, only to the extent expressly provided in the Loan Documents. Notwithstanding any other provision of this Agreement or any other Loan Document to
the contrary, the Agent shall not be required to verify the payment of, or that other satisfactory arrangements have been made, with respect to, Obligations arising under any Bank Product. 

12.18 Co-Agents. None of the Lenders identified on the facing page or signature pages of this Agreement as a
“co-agent” or “documentation agent” (if any) shall have any right, power, obligation, liability, responsibility or duty under this Agreement other than those applicable to all Lenders as
such. Without limiting the foregoing, none of the Lenders so identified as a “co-agent” or “documentation agent” (if any) shall have or be deemed to have any fiduciary relationship with any Lender. Each Lender
acknowledges that it has not relied, and will not rely, on any of the Lenders so identified in deciding to enter into this Agreement or in taking or not taking action hereunder. 

12.19 Bank Product Providers. Each provider of the Bank Products, by delivery of a notice to the Agent of the existence or increase of
a Bank Product, agrees to be bound by Section 7.23 and this Section 12.19. Each provider of any Bank Product shall indemnify and hold harmless the Agent-Related Persons, to the extent not reimbursed by the Loan
Parties, against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, charges, expenses, and disbursements (including Attorney Costs) of any kind or nature whatsoever that may be incurred by or asserted
against any Agent-Related Person in connection with such provider’s Bank Product obligations. 

ARTICLE 13. 

MISCELLANEOUS 
 13.1 No
Waivers; Cumulative Remedies. No failure by the Agent or any Lender to exercise any right, remedy, or option under this Agreement or any present or future supplement thereto, or in any other agreement between or among any Borrower and the Agent
and/or any Lender, or delay by the Agent 

  
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or any Lender in exercising the same, will operate as a waiver thereof. No waiver by the Agent or any Lender will be effective unless it is in writing, and then only to the extent specifically
stated. No waiver by the Agent or the Lenders on any occasion shall affect or diminish the Agent’s and each Lender’s rights thereafter to require strict performance by the Borrowers of any provision of this Agreement. The Agent and the
Lenders may proceed directly to collect the Obligations without any prior recourse to the Collateral. The Agent’s and each Lender’s rights under this Agreement will be cumulative and not exclusive of any other right or remedy which the
Agent or any Lender may have. 
 13.2 Severability. The illegality or unenforceability of any provision of this Agreement or any Loan
Document or any instrument or agreement required hereunder shall not in any way affect or impair the legality or enforceability of the remaining provisions of this Agreement or any instrument or agreement required hereunder. 

13.3 Governing Law; Choice of Forum; Service of Process. 

(a) The Loan Documents have been entered into pursuant to Section 5-1401 of the New York General Obligations Law and the
substantive laws of the State of New York (except to the extent the laws of another jurisdiction govern the creation, perfection, validity, or enforcement of Liens under the Collateral Documents), and the applicable federal laws of the United States
of America shall govern the validity, construction, enforcement and interpretation of the Loan Documents. 
 (b) Each party
hereto (including each Guarantor by execution of an Obligation Guaranty), in each case for itself, its successors and assigns, hereby (A) irrevocably submits to the nonexclusive jurisdiction of the state (pursuant to Section 5-1402 of the
New York General Obligations Law) and federal courts located in the Borough of Manhattan in the State of New York, and agrees and consents that service of process may be made upon it in any legal proceeding arising out of or in connection with the
Loan Documents and the Obligations by service of process as provided by New York law, (B) irrevocably waives, to the fullest extent permitted by law, any objection which it may now or hereafter have to the laying of venue of any litigation
arising out of or in connection with the Loan Documents and the Obligations brought in any such court, (C) irrevocably waives to the fullest extent permitted by law any claims that any litigation brought in any such court has been brought in an
inconvenient forum, (D) agrees to designate and maintain an agent for service of process in New York in connection with any such litigation and to deliver to the Agent evidence thereof, if requested, and (E) irrevocably agrees to the
fullest extent permitted by law that any legal proceeding against any party hereto arising out of or in connection with the Loan Documents or the Obligations shall be brought in one of the aforementioned courts. The scope of each of the foregoing
waivers is intended to be all-encompassing of any and all disputes that may be filed in any court and that relate to the subject matter of this transaction, including, without limitation, contract claims, tort claims, breach of duty claims, and all
other common law and statutory claims. The Loan Parties and each other party to the Loan Documents acknowledge that this waiver is a material inducement to the agreement of each party hereto to enter into a business relationship, that each has
already relied on this waiver in entering into the Loan Documents, and each will continue to rely on each of such waivers in related future dealings. The Loan Parties and each other party to the Loan Documents warrant and represent that they have
reviewed these waivers with their legal counsel, and that they knowingly and voluntarily agree to each such waiver following consultation with legal counsel. THE WAIVERS IN THIS SECTION 13.3 ARE IRREVOCABLE, MEANING THAT THEY MAY
NOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THESE WAIVERS SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, SUPPLEMENTS, AND REPLACEMENTS TO OR OF THIS OR ANY OTHER LOAN DOCUMENT. In the 

  
 73 

 
event of litigation, this Agreement may be filed as a written consent to a trial by the court. Notwithstanding the foregoing: (1) the Agent and the Lenders shall have the right to bring any
action or proceeding against any Loan Party or their property in the courts of any other jurisdiction the Agent or the Lenders deem necessary or appropriate in order to realize on the Collateral or other security for the Obligations and
(2) each of the parties hereto acknowledges that any appeals from the courts described in the immediately preceding sentence may have to be heard by a court located outside those jurisdictions. 

(c) EACH BORROWER AND EACH OTHER LOAN PARTY (BY EXECUTION OF AN OBLIGATION GUARANTY) HEREBY WAIVES PERSONAL SERVICE OF ANY AND
ALL PROCESS UPON IT AND CONSENTS THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY REGISTERED MAIL (RETURN RECEIPT REQUESTED) DIRECTED TO WESTLAKE AT ITS ADDRESS SET FORTH IN SECTION 13.8 AND SERVICE SO MADE SHALL BE DEEMED TO BE
COMPLETED UPON THE EARLIER OF (I) TWO (2) DAYS AFTER THE SAME SHALL HAVE BEEN SO DEPOSITED WITH A NATIONALLY-RECOGNIZED OVERNIGHT COURIER OR (II) WHEN ACTUALLY DELIVERED TO SUCH PERSON. NOTHING CONTAINED HEREIN SHALL AFFECT THE RIGHT
OF THE AGENT OR THE LENDERS TO SERVE LEGAL PROCESS BY ANY OTHER MANNER PERMITTED BY LAW. 
 13.4 WAIVER OF JURY TRIAL. EACH BORROWER
AND EACH OTHER LOAN PARTY (BY EXECUTION OF AN OBLIGATION GUARANTY). THE LENDERS, AND THE AGENT EACH IRREVOCABLY WAIVE THEIR RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF OR RELATED TO THIS
AGREEMENT, THE OTHER LOAN DOCUMENTS, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY, IN ANY ACTION, PROCEEDING, OR OTHER LITIGATION OF ANY TYPE BROUGHT BY ANY SUCH PARTIES AGAINST ANY OTHER SUCH PARTY OR ANY AGENT-RELATED PERSON, PARTICIPANT, OR
ASSIGNEE, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS, OR OTHERWISE. EACH BORROWER, THE LENDERS, AND THE AGENT EACH AGREE THAT ANY SUCH CLAIM OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY. WITHOUT LIMITING THE FOREGOING,
THE PARTIES FURTHER AGREE THAT THEIR RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY OR
ENFORCEABILITY OF THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, OR ANY PROVISION HEREOF OR THEREOF. THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS, OR MODIFICATIONS TO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS. 

13.5 Survival of Representations and Warranties. All of the Borrowers’ representations and warranties contained in this Agreement
shall survive the execution, delivery, and acceptance thereof by the parties, notwithstanding any investigation by the Agent or the Lenders or their respective agents. 

13.6 Other Security and Guaranties. The Agent, may, without notice or demand and without affecting any Borrower’s obligations
hereunder, from time to time: (a) take from any Person and hold collateral (other than the Collateral) for the payment of all or any part of the Obligations and exchange, enforce, or release such collateral or any part thereof; and
(b) accept and hold any endorsement or guaranty of payment of all or any part of the Obligations and release or substitute any such endorser or guarantor, or any Person who has given any Lien in any other collateral as security for the payment
of all or any part of the Obligations, or any other Person in any way obligated to pay all or any part of the Obligations. 

  
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 13.7 Fees and Expenses. The Borrowers agree to pay to the Agent and the Arranger (as
applicable), for their respective benefits, on demand, all reasonable costs and expenses that the Agent or the Arranger pays or incurs in connection with the negotiation, preparation, syndication, consummation, administration, enforcement, and
termination of this Agreement or any of the other Loan Documents, including: (a) Attorney Costs and costs and expenses of auditors, accountants, consultants or appraisers hired by the Agent; (b) costs and expenses (including, without
duplication, attorneys’ and paralegals’ fees and disbursements) for any amendment, supplement, waiver, consent, or subsequent closing in connection with the Loan Documents and the transactions contemplated thereby; (c) costs and
expenses of lien searches; (d) taxes, fees, and other charges for recording any mortgages, filing financing statements, amendments, and continuations, and other actions to perfect, protect, and continue the Agent’s Liens (including costs
and expenses paid or incurred by the Agent in connection with the consummation of the Agreement); (e) sums paid or incurred to pay any amount or take any action reasonably required of any Borrower under the Loan Documents that Borrowers fail to
pay or take; (f) costs of appraisals, inspections, and verifications of the Collateral, including travel, lodging, and meals for inspections of the Collateral and the Loan Parties’ operations by the Agent plus the Agent’s then
customary charge for field examinations and audits and the preparation of reports thereof (such charge is currently $1,000 per day (or portion thereof) for each Person retained or employed by the Agent with respect to each field examination or
audit); and (g) costs and expenses of forwarding loan proceeds, collecting checks, and other items of payment, and establishing and maintaining Payment Accounts and lock boxes, and costs and expenses of preserving and protecting the Collateral.
In addition, the Borrowers agree to pay costs and expenses incurred by the Agent, the Arranger, the Letter of Credit Issuers, and the Lenders (including Attorneys’ Costs and attorneys’ fees of each Lender) to the Agent, the Arranger, the
Letter of Credit Issuers, and the Lenders, as applicable, for their respective benefit, on demand, and all reasonable fees, expenses and disbursements incurred by the Agent, the Arranger, the Letter of Credit Issuers, and the Lenders for any law
firm retained by the Agent, the Arranger, any Letter of Credit Issuer, or any Lender, in each case, paid or incurred to obtain payment of the Obligations, enforce the Agent’s Liens, sell or otherwise realize upon the Collateral, and otherwise
enforce the provisions of the Loan Documents, or to defend any claims made or threatened against the Agent, the Arranger, any Letter of Credit Issuer, or any Lender arising out of the transactions contemplated hereby (including preparations for and
consultations concerning any such matters). The foregoing shall not be construed to limit any other provisions of the Loan Documents regarding costs and expenses to be paid by the Borrowers. All of the foregoing costs and expenses may be (in the
sole discretion of the Agent) charged to the Borrowers’ Loan Account as Revolving Loans as described in Section 3.7 up to the Maximum Revolver Amount. Except as provided in clause (d) above, this
Section 13.7 shall not apply to Taxes, which shall be covered solely by Sections 4.1 and 4.3. 

13.8 Notices. Except as otherwise provided herein, all notices, demands and requests that any party is required or elects to give to
any other shall be in writing, or by a telecommunications device capable of creating a written record, and any such notice shall become effective (a) on the earlier of (i) two (2) days after the same shall have been so deposited with
a nationally-recognized overnight courier or (ii) when actually delivered to such person, (b) four (4) days after it shall have been mailed by United States mail, first class, certified or registered, with postage prepaid, or
(c) in the case of notice by such a telecommunications device, when properly transmitted, in each case addressed to the party to be notified as follows: 

If to the Agent or to the Bank: 

Bank of America, N.A. 

901 Main Street, 11th Floor 

Dallas, Texas 75202 

Attention: Portfolio Manager 

Facsimile No.: 312.453.3558 

  
 75 

 with copies to: 

Haynes and Boone, LLP 

2323 Victory Avenue, Suite 700 

Dallas, TX 75219 

Attention: Sue P. Murphy 

Facsimile No.: 214.200.0565 
 If
to the Borrowers: 
 Westlake Chemical Corporation 

2801 Post Oak Boulevard 

Houston, TX 77056 

Attention: Treasurer 

Facsimile No.: 713.960.9420 

with copies to: 
 Westlake
Chemical Corporation 
 2801 Post Oak Boulevard 

Houston, TX 77056 

Attention: General Counsel 

Facsimile No.: 713.926.6239 
 or
to such other address as each party may designate for itself by like notice. Failure or delay in delivering copies of any notice, demand, request, consent, approval, declaration or other communication to the persons designated above to receive
copies shall not adversely affect the effectiveness of such notice, demand, request, consent, approval, declaration or other communication. All notices and requests given to any Lender other than the Bank shall be given to the address, telecopier
number, electronic mail address or telephone number specified in its administrative questionnaire, or such other address as such Lender may notify the Agent in writing. 

Borrower Materials shall be delivered pursuant to procedures approved by the Agent, including electronic delivery (if possible) upon request by the Agent to
an electronic system maintained by the Agent (“Platform”). Borrowers shall notify the Agent of each posting of Borrower Materials on the Platform and the materials shall be deemed received by the Agent only upon its receipt
of such notice. Borrower Materials and other information relating to this credit facility may be made available to Secured Parties on the Platform, and the Loan Parties and Secured Parties acknowledge that “public” information is not
segregated from material non-public information on the Platform. The Platform is provided “as is” and “as available.” The Agent does not warrant the accuracy or completeness of any information on the Platform nor the adequacy or
functioning of the Platform, and expressly disclaims liability for any errors or omissions in the Borrower Materials or any issues involving the Platform. NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT OF THIRD PARTY RIGHTS, OR FREEDOM FROM VIRUSES OR OTHER CODE DEFECTS, IS MADE BY AGENT WITH RESPECT TO BORROWER MATERIALS OR THE PLATFORM. Secured Parties acknowledge that Borrower
Materials may include material non-public information of the Loan Parties and should not be made available to any personnel who do not wish to receive such information or who may be engaged in investment or other market-related activities with
respect to any Loan Party’s securities. No Agent Indemnitee shall have any liability to Borrowers, Secured Parties or any other Person for losses, claims, damages, liabilities or expenses of any kind (whether in tort, contract or otherwise)
relating to use by any Person of the Platform or delivery of Borrower Materials and other information through the Platform or over the internet. 

  
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 13.9 Waiver of Notices. Unless otherwise expressly provided herein, each Borrower waives
presentment, and notice of demand or dishonor and protest as to any instrument, notice of intent to accelerate the Obligations, and notice of acceleration of the Obligations, as well as any and all other notices to which it might otherwise be
entitled. No notice to or demand on any Borrower which the Agent or any Lender may elect to give shall entitle any Borrower to any or further notice or demand in the same, similar, or other circumstances. 

13.10 Binding Effect. The provisions of this Agreement shall be binding upon and inure to the benefit of the respective
representatives, successors, and assigns of the parties hereto; provided, however, that no interest herein may be assigned by any Borrower without prior written consent of the Agent and each Lender. The rights and benefits of the Agent
and the Lenders hereunder shall, if such Persons so agree, inure to any party acquiring any interest in the Obligations or any part thereof. 

13.11 Indemnity of the Agent, the Arranger, the Letter of Credit Issuers and the Lenders by the Borrowers. 

(a) Each Borrower and each other Loan Party (by execution of an Obligation Guaranty) agrees to defend, indemnify, and hold the
Agent-Related Persons, the Arranger, each Letter of Credit Indemnitee, each Lender and each of their respective Affiliates, officers, directors, employees, counsel, representatives, agents, trustees, and attorneys in fact (each, an
“Indemnified Person”) harmless from and against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, charges, expenses, and disbursements (including Attorney Costs) of any kind
or nature whatsoever which may at any time (including at any time following repayment of the Revolving Loans and the termination, resignation, or replacement of the Agent or replacement of any Lender) be imposed on, incurred by, or asserted against
any such Person in any way relating to or arising out of this Agreement or any document contemplated by or referred to herein, or the transactions contemplated hereby, or any action taken or omitted by any such Person under or in connection with any
of the foregoing, including with respect to any investigation, litigation, or proceeding (including any insolvency proceeding or appellate proceeding) related to or arising out of this Agreement, any other Loan Document, or the Revolving Loans or
the use of the proceeds thereof, whether brought by a third party or by a Borrower or any other Loan Party, and regardless of whether any Indemnified Person is a party thereto (all the foregoing, collectively, the “Indemnified
Liabilities”), IN ALL CASES, WHETHER OR NOT CAUSED BY OR ARISING, IN WHOLE OR IN PART, OUT OF THE COMPARATIVE, CONTRIBUTORY OR SOLE NEGLIGENCE OF THE INDEMNIFIED PERSON; provided, that the Borrowers shall have no
obligation hereunder to any Indemnified Person with respect to Indemnified Liabilities to the extent resulting from the gross negligence or willful misconduct of such Indemnified Person determined in a final non-appealable judgment by a court of
competent jurisdiction. The agreements in this Section shall survive payment of all other Obligations. This Section 13.11(a) shall not apply to Taxes, which shall be covered solely by Sections 4.1,
4.3 and 13.7(d). 
 (b) Each Borrower and each other Loan Party (by execution of an Obligation
Guaranty) agrees to indemnify, defend, and hold harmless the Agent, the Letter of Credit Indemnitees and the Lenders from any Environmental Liability, arising directly or indirectly, in whole or in part, out of any breach of this Agreement,
including without limitation, any breach of Section 6.14 or Section 7.7 by any Loan Party. This indemnity will apply whether the Hazardous Material is on, under, or about any Real Estate or operations or
property leased to, or formerly 

  
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owned or operated by, any Loan Party or any of their Subsidiaries. The indemnity includes, but is not limited to, Attorneys Costs. The indemnity extends to the Agent and the Lenders, their
parents, affiliates, subsidiaries, and all of their directors, officers, employees, agents, successors, attorneys, and assigns. This indemnity will survive repayment of all other Obligations. This indemnity is intended to allocate responsibility
between the Loan Parties and the Agent and the Lenders as contemplated by Section 107(e)(1) of CERCLA and any successor federal statute, rule, or regulations or comparable state statute, rule, or regulations. 

13.12 Limitation of Liability. NO CLAIM MAY BE MADE BY ANY LOAN PARTY, ANY LENDER, OR OTHER PERSON AGAINST THE AGENT, THE ARRANGER, ANY
LENDER, OR THE AFFILIATES, DIRECTORS, OFFICERS, EMPLOYEES, COUNSEL, REPRESENTATIVES, AGENTS, OR ATTORNEYS-IN-FACT OF ANY OF THEM FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE DAMAGES IN RESPECT OF ANY CLAIM FOR BREACH OF CONTRACT OR ANY
OTHER THEORY OF LIABILITY ARISING OUT OF OR RELATED TO THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY ACT, OMISSION, OR EVENT OCCURRING IN CONNECTION THEREWITH, AND EACH BORROWER AND EACH OTHER LOAN PARTY (BY
EXECUTION OF AN OBLIGATION GUARANTY) AND EACH LENDER HEREBY WAIVES, RELEASES, AND AGREES NOT TO SUE UPON ANY CLAIM FOR SUCH DAMAGES, WHETHER OR NOT ACCRUED AND WHETHER OR NOT KNOWN OR SUSPECTED TO EXIST IN ITS FAVOR. Notwithstanding the foregoing,
nothing in this Section 13.12 shall impair, limit or restrict any indemnification obligations of any Loan Party or any Lender under any Loan Document. No Indemnified Person referred to in Section 13.11(a) above
shall be liable for any damages arising from the use by unintended recipients of any information or other materials distributed by it through telecommunications, electronic or other information transmission systems in connection with this Agreement
or the other Loan Documents or the transactions contemplated hereby or thereby. 
 13.13 No Advisory or Fiduciary Responsibility. In
connection with all aspects of each transaction contemplated by any Loan Document, the Borrowers acknowledge and agree that (a)(i) this credit facility and any related arranging or other services by the Agent, any Lender, any of their
Affiliates or any arranger are arm’s-length commercial transactions between the Borrowers and such Person; (ii) the Borrowers have consulted their own legal, accounting, regulatory and tax advisors to the extent they have deemed
appropriate; and (iii) the Borrowers are capable of evaluating, and understand and accept, the terms, risks and conditions of the transactions contemplated by the Loan Documents; (b) each of the Agent, the Lenders, their Affiliates and any
arranger is and has been acting solely as a principal and, except as expressly agreed in writing by the relevant parties, has not been, is not, and will not be acting as an advisor, agent or fiduciary for the Borrowers, any of their Affiliates or
any other Person, and has no obligation with respect to the transactions contemplated by the Loan Documents except as expressly set forth therein; and (c) the Agent, the Lenders, their Affiliates and any arranger may be engaged in a broad range
of transactions that involve interests that differ from those of the Borrowers and their Affiliates, and have no obligation to disclose any of such interests to the Borrowers or their Affiliates. To the fullest extent permitted by applicable Law,
each Borrower hereby waives and releases any claims that it may have against the Agent, the Lenders, their Affiliates and any arranger with respect to any breach of agency or fiduciary duty in connection with any transaction contemplated by a Loan
Document. 
 13.14 Final Agreement. THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND
MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. No modification, rescission, waiver, release, or amendment of any provision of
this Agreement or any other Loan Document shall be made, except by a written agreement signed by the Borrowers and a duly authorized officer of each of the Agent and the requisite Lenders. 

  
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 13.15 Counterparts. This Agreement may be executed in any number of counterparts, and by
the Agent, each Lender, and each Borrower in separate counterparts, each of which shall be an original, but all of which shall together constitute one and the same agreement; signature pages may be detached from multiple separate counterparts and
attached to a single counterpart so that all signature pages are physically attached to the same document. 
 13.16 Captions. The
captions contained in this Agreement are for convenience of reference only, are without substantive meaning and should not be construed to modify, enlarge, or restrict any provision. 

13.17 Right of Setoff. In addition to any rights and remedies of the Lenders provided by law, if an Event of Default exists or the
Revolving Loans have been accelerated, the Agent, each Letter of Credit Issuer, each Lender, and any of their respective Affiliates are authorized at any time and from time to time, without prior notice to any Loan Party, any such notice being
waived by each Loan Party to the fullest extent permitted by law, to set off and apply any and all deposits (general or special, time or demand, provisional or final) at any time held by, and other indebtedness at any time owing by, the Agent, such
Letter of Credit Issuer, such Lender, or such Affiliate to or for the credit or the account of any Loan Party against any and all Obligations (for the benefit of all Lenders as provided herein), now or hereafter existing, irrespective of whether or
not the Agent, such Letter of Credit Issuer or such Lender shall have made demand under this Agreement or any Loan Document and although such Obligations may be contingent or unmatured. Each Letter of Credit Issuer and each Lender agree to promptly
notify the Borrowers and the Agent after any such setoff and application made by such Letter of Credit Issuer or such Lender; provided, however, that the failure to give such notice shall not affect the validity of such set off and
application. If any Lender shall obtain any payment or prepayment with respect to the Obligation as a result of exercising its right under this Section 13.16 which is in excess of its share of any such payment in accordance with
the relevant rights of the Lenders under the Loan Documents, then such Lender shall purchase from the other Lenders such participations as shall be necessary to cause such purchasing Lender to share the excess payment with each other Lender in
accordance with the relevant rights under the Loan Documents. If all or any portion of such excess payment is subsequently recovered from such purchasing Lender, then the purchase shall be rescinded and the purchase price restored to the extent of
such recovery. Each Loan Party agrees that any Lender purchasing a participation from another Lender pursuant to this Section may, to the fullest extent permitted by law, exercise all of its rights of payment (including the right of
offset) with respect to such participation as fully as if such Lender were the direct creditor of such Loan Party in the amount of such participation. 

13.18 Confidentiality. 

(a) Each Borrower hereby consents that the Agent and each Lender may issue and disseminate to the public general
non-confidential information describing the credit accommodation entered into pursuant to this Agreement, including the names and addresses of the Borrowers and a general description of the business of the Borrowers and may use the Borrowers’
name in advertising and other promotional material. 
 (b) The Agent and each Lender severally agrees to take customary and
reasonable precautions and exercise due care to maintain the confidentiality of all information identified as “confidential” or “secret” by the Borrowers and provided to the Agent or such Lender by or on behalf of
the Borrowers, under this Agreement, or any other Loan Document, except to the extent that such information (i) was or becomes generally available to the public other than as a result of 

  
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disclosure by the Agent or such Lender, (ii) was or becomes available on a nonconfidential basis from a source other than the Borrowers, provided that such source is not bound by a
confidentiality agreement with the Borrowers known to the Agent or such Lender, (iii) was in possession of a Lender prior to disclosure made by the Borrowers, or (iv) is independently developed by any Lender without the use or knowledge of
any Confidential Information; provided, however, that the Agent and any Lender may disclose such information (1) at the request or pursuant to any requirement of any Governmental Authority to which the Agent or such Lender is
subject or in connection with an examination of the Agent or such Lender by any such Governmental Authority; (2) pursuant to subpoena or other court process; (3) when required to do so in accordance with the provisions of any applicable
Requirement of Law; (4) to the extent reasonably required in connection with any litigation or proceeding (including, but not limited to, any bankruptcy proceeding) to which the Agent, any Lender or their respective Affiliates may be party;
(5) to the extent reasonably required in connection with the exercise of any remedy hereunder or under any other Loan Document; (6) to the Agent’s or such Lender’s independent auditors, accountants, agents, attorneys, service
providers, other professional advisors, rating agencies, insurers, insurance brokers, and providers of credit risk protection, provided that such Persons have been informed that such information is required to be kept confidential to the
extent required by this Section 13.18; (7) to any prospective Participant or Assignee under any Assignment and Acceptance, actual or potential, provided that such prospective Participant or Assignee agrees to keep such
information confidential to the same extent required of the Agent and the Lenders hereunder; (8) as expressly permitted under the terms of any other document or agreement regarding confidentiality to which any Borrower is party with the Agent
or such Lender, and (9) to its Affiliates; provided that such Persons have been informed that such information is required to be kept confidential to the extent required by this Section 13.18. Notwithstanding anything
herein to the contrary, the information subject to this Section 13.18(b) shall not include, and the Agent, each Lender, and each employee, representative, or other agent of the Agent or any Lender may disclose to any and all
persons without limitation of any kind, the “tax treatment” and “tax structure” (in each case, within the meaning of Treasury Regulation Section 1.6011-4) of the transactions contemplated hereby and all
materials of any kind (including opinions or other tax analyses) that are provided to the Agent or such Lender relating to such tax treatment and tax structure. 

13.19 Conflicts with Other Loan Documents. Unless otherwise expressly provided in this Agreement (or in another Loan Document by
specific reference to the applicable provision contained in this Agreement), if any provision contained in this Agreement conflicts with any provision of any other Loan Document, the provision contained in this Agreement shall govern and control.

 13.20 Westlake as Agent. By executing this Agreement, each of the Borrowers confirms to the other parties to this Agreement that
Westlake shall (and has been duly appointed by each of the Borrowers to) act as agent for the Borrowers for all purposes of the Loan Documents, including, without limitation, taking any action or receiving any communication on behalf of such
Borrower in connection with the Loan Documents. Each of the Lenders and the Agent shall be entitled to deal with any Borrower through Westlake and to rely on any instructions or other communications from Westlake on behalf of any Borrower. None of
the Lenders or the Agent shall have any responsibility to any Borrower for dealing with the Borrowers as provided in this Section 13.20, and the Obligation of each of the Borrowers to the Lenders shall not be affected by any
matter relating to acts or omissions of Westlake relating to the Borrowing or otherwise as agent for the Borrowers hereunder. Notwithstanding the appointment of Westlake as agent for the Borrowers hereunder, the Agent and the Lenders shall in their
sole discretion be entitled to deal directly with any Borrower for all purposes of the Loan Documents. 

  
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 13.21 Patriot Act Notice. The Agent and Lenders hereby notify the Loan Parties that
pursuant to the requirements of the Patriot Act, the Agent and Lenders are required to obtain, verify and record information that identifies each Loan Party, including its legal name, address, tax ID number and other information that will allow the
Agent and the Lenders to identify it in accordance with the Patriot Act. The Agent and the Lenders will also require information regarding each personal guarantor, if any, and may require information regarding the Borrowers’ management and
owners, such as legal name, address, social security number and date of birth. 
 13.22 Restatement of Existing Credit Agreement. The
parties hereto agree that: (a) the Obligations (as defined in this Agreement) represent, among other things, the restatement, renewal, amendment, extension and modification of the “Obligations” (as defined in the
Existing Credit Agreement); (b) this Agreement is intended to, and does hereby, restate, renew, extend, amend, modify, supersede and replace the Existing Credit Agreement in its entirety; (c) the Notes executed pursuant to this Agreement
amend, renew, extend, modify, replace, restate, substitute for and supersede in their entirety (but do not extinguish, the indebtedness arising under) the promissory notes issued pursuant to the Existing Credit Agreement, which existing promissory
notes shall be returned to the Agent promptly after the Closing Date, marked “canceled and replaced,” and, thereafter, delivered by the Agent to the Borrowers; (d) the entering into and performance of their respective
obligations under the Loan Documents and the transactions evidenced hereby do not constitute a novation nor shall they be deemed to have terminated, extinguished or discharged the indebtedness under the Existing Credit Agreement, all of which
indebtedness shall continue under and be governed by this Agreement and the other Loan Documents, except as expressly provided otherwise herein; (e) the liens and security interests created by or pursuant to the Existing Credit Agreement,
except as specifically modified by the Loan Documents, are ratified and confirmed as security for the Obligations, without novation, discharge or interruption; and (f) on the Closing Date, the Lenders shall severally purchase from each other
and from any Lenders (as defined in the Existing Credit Agreement) that are not Lenders hereunder (the “Non-Continuing Lenders”), the Commitments of such Non-Continuing Lenders under the Existing Credit Agreement so that,
after giving effect to such purchase and to any Loans made on the Closing Date, the Commitments and the principal indebtedness owing under this Agreement and participations in the Letters of Credit are held by the Lenders in accordance with their
respective Pro Rata Share, and the Non-Continuing Lenders shall cease to be a party to the Existing Credit Agreement and shall not be parties to this Agreement. Such purchases shall have been deemed to have been automatically made hereunder without
the necessity of the execution and delivery of any assignment documentation, on an as-is, where-is basis by the Non-Continuing Lenders and any Non-Continuing Lender shall be deemed to be a third party beneficiary of this
Section 13.22. 
 13.23 Confirmations. Each Loan Party ratifies and confirms that each Obligation Guaranty, each
Security Agreement, each Trademark Security Agreement, each Patent Security Agreement, and the other Loan Documents (to the extent it is a party thereto) are and remain in full force and effect in accordance with their respective terms, as amended
hereby. In addition, each Loan Party acknowledges, agrees, accepts, and consents to the terms and provisions hereof and each other Loan Document as amended hereby. Except as expressly provided herein, this Agreement does not constitute a waiver or
modification of any of the terms or provisions set forth in the Loan Documents and shall not impair any right that the Agent or Lenders may now or hereafter have under or in connection with any Loan Document. Each Loan Party confirms, renews,
regrants, and acknowledges all Liens and security interests set forth in the Loan Documents, except as modified herein, continue to secure the Obligations, and that the Obligations shall continue to be guaranteed pursuant to each Obligation
Guaranty. Each such Loan Party agrees and acknowledges its joint and several liabilities and obligations as a Borrower, including, without limitation, with respect to any Obligations outstanding on the date hereof under the Existing Credit
Agreement. 

  
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 13.24 Electronic Execution. The words “execution,” “signed,”
“signature,” and words of like import in this Agreement, any Assignment and Assumption, or in any amendment or other modification hereof (including waivers and consents) shall be deemed to include electronic signatures or the keeping
of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in
any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act. 

13.25 Consent to MLP Transaction. The Lenders hereby consent to the transactions described under the heading “Formation
Transactions and Partnership Structure” and “Prospectus Summary” set forth in the Form S-1 Registration Statement filed by Westlake Chemical Partners LP on April 29, 2014 with the Securities and Exchange Commission (a copy of the
relevant portion of such Registration Statement is attached hereto as Schedule 13.25) and waive any Default or Event of Default that may exist as a result of such transactions. 

[Remainder of Page Intentionally Blank. Signature Page Follows.] 

  
 82 

 
			
	BORROWERS AND GUARANTORS:
	
	    WESTLAKE CHEMICAL CORPORATION,
	    a Delaware corporation
	 WESTLAKE PVC CORPORATION, a Delaware corporation

	 WESTLAKE VINYLS, INC., a Delaware corporation

	 WESTLAKE LONGVIEW CORPORATION, a Delaware corporation

	 WESTLAKE SUPPLY AND TRADING COMPANY, a Delaware corporation

		
	    By:	 	/s/ Albert Chao
		 	Albert Chao
		 	President of the above Borrowers and Guarantors

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	NORTH AMERICAN PIPE CORPORATION,
	a Delaware corporation
	WESTECH BUILDING PRODUCTS, INC., a Delaware corporation
		
	By:	 	/s/ Robert F. Buesinger
		 	Robert F. Buesinger
		 	President of the above Borrowers and Guarantors
	
	NORTH AMERICAN SPECIALTY PRODUCTS LLC, a Delaware limited liability company
		
	By:	 	North American Pipe Corporation, its manager
		
	By:	 	/s/ Robert F. Buesinger
		 	Robert F. Buesinger
		 	President of the manager of the above Borrower and Guarantor

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
					
	WESTLAKE VINYLS COMPANY LP, a Delaware limited partnership
		
	By:	 	GVGP, Inc., its general partner
			
		 	By:	 	/s/ Albert Chao
		 		 	Albert Chao
		 		 	President of the general partner of the above Borrower and Guarantor
	
	WESTLAKE PETROCHEMICALS LLC, a Delaware limited liability company
	WESTLAKE POLYMERS LLC, a Delaware limited liability company
	WESTLAKE STYRENE LLC, a Delaware limited liability company
	WPT LLC, a Delaware limited liability company
			
	By:	 		 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
		 	Albert Chao
		 	President of the manager of the above Borrowers and Guarantors

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	GUARANTORS:
	
	WESTLAKE DEVELOPMENT CORPORATION, a Delaware corporation
	GVGP, INC., a Delaware corporation
		
	By:	 	/s/ Albert Chao
		 	Albert Chao
		 	President of the above Guarantors

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
									
	WESTLAKE CHEMICAL OPCO LP, a Delaware limited partnership
		
	By:	 	Westlake Chemical OpCo GP LLC, its general partner
			
		 	By:	 	WPT LLC, its sole member
				
		 		 	By:	 	Westlake Chemical Investments, Inc., its manager
					
		 		 		 	By:	 	/s/ Albert Chao
		 		 		 		 	Albert Chao
		 		 		 		 	President of the manager of the sole member of the general partner of the above Guarantor

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	WESTLAKE ETHYLENE PIPELINE CORPORATION, a Delaware corporation
		
	By:	 	/s/ Mark Steven Bender
		 	Mark Steven Bender
		 	Senior Vice President, CFO and Treasurer of the above Borrower and Guarantor

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	GEISMAR HOLDINGS, INC.,
	a Delaware corporation
	WESTLAKE CHEMICAL INVESTMENTS, INC., a Delaware corporation
	WESTLAKE MANAGEMENT SERVICES, INC., a Delaware corporation
	WESTLAKE OLEFINS CORPORATION, a Delaware corporation
	WESTLAKE RESOURCES CORPORATION, a Delaware corporation
	WESTLAKE VINYL CORPORATION, a Delaware corporation
	WESTLAKE NG I CORPORATION, a Delaware corporation
	WESTLAKE NG IV CORPORATION, a Delaware corporation
	WESTLAKE NG V CORPORATION, a Delaware corporation
		
	By:	 	/s/ Mark Steven Bender
		 	Mark Steven Bender
		 	Senior Vice President, CFO and Treasurer of the above Guarantors

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
					
	WESTLAKE GEISMAR POWER COMPANY LLC, a Delaware limited liability company
	
	By: Westlake Vinyls Company LP, its manager
			
		 	By:	 	GVGP, Inc., its general partner
			
		 	By:	 	 /s/ Mark Steven Bender

		 		 	Mark Steven Bender
		 		 	Senior Vice President, CFO and Treasurer of the general partner of the manager of the above Guarantor
	
	WESTLAKE PIPELINE INVESTMENTS LLC, a Delaware limited liability company
		
	By:	 	Westlake Chemical Investments, Inc., its manager
			
		 	By:	 	 /s/ Mark Steven Bender

		 		 	Mark Steven Bender
		 		 	Senior Vice President, CFO and Treasurer of the manager of the above Guarantor

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	BANK OF AMERICA, N.A.,
	as the Agent and a Lender
		
	By:	 	 /s/ Hance VanBeber

		 	Name: Hance VanBeber
		 	Title: Senior Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	BARCLAYS BANK PLC,
	as a Lender
		
	By:	 	 /s/ Irina Dimova

		 	Name: Irina Dimova
		 	Title: Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	BNP PARIBAS,
	as a Lender
		
	By:	 	 /s/ Guelay Mese

		 	Name: Guelay Mese
		 	Title: Director
		
	By:	 	 /s/ Govind Gupta

		 	Name: Govind Gupta
		 	Title: Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	BRANCH BANKING AND TRUST COMPANY,
	as a Lender
		
	By:	 	 /s/ Matt McCain

		 	Name: Matt McCain
		 	Title: Senior Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	DEUTSCHE BANK AG NEW YORK BRANCH,
	as a Lender
		
	By:	 	 /s/ Marcus M. Tarkington

		 	Name: Marcus M. Tarkington
		 	Title: Director
		
	By:	 	 /s/ Lisa Wong

		 	Name: Lisa Wong
		 	Title: Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	JPMORGAN CHASE BANK, N.A.,
	as a Lender
		
	By:	 	 /s/ J. Devin Mock

		 	Name: J. Devin Mock
		 	Title: Authorized Officer

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	MORGAN STANLEY BANK, N.A.,
	as a Lender
		
	By:	 	 /s/ Michael King

		 	Name: Michael King
		 	Title: Authorized Signatory

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	PNC BANK, NATIONAL ASSOCIATION,
	as a Lender
		
	By:	 	 /s/ John Berry

		 	Name: John Berry
		 	Title: Vice President

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	UBS AG, STAMFORD BRANCH,
	as a Lender
		
	By:	 	 /s/ Lana Gifas

		 	Name: Lana Gifas
		 	Title: Director
		
	By:	 	 /s/ Jennifer Anderson

		 	Name: Jennifer Anderson
		 	Title: Associate Director

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 
			
	WELLS FARGO CAPITAL FINANCE, LLC,
	as a Lender
		
	By:	 	 /s/ Reza Sabahi

		 	Name: Reza Sabahi
		 	Title: Duly Authorized Signatory

  
 Signature Page to 

Third Amended and Restated Credit Agreement 

 ANNEX A 

to 
 Third Amended and
Restated Credit Agreement 
 Definitions 

Capitalized terms used in the Loan Documents shall have the following respective meanings (unless otherwise defined therein), and all section references in
the following definitions shall refer to sections of the Agreement: 
 “Accounts” means all of the Loan Party’s
now owned or hereafter acquired or arising accounts, as defined in the UCC, including any rights to payment for the sale or lease of goods or rendition of services, whether or not they have been earned by performance. 

“Account Debtor” means each Person obligated in any way on or in connection with an Account, Chattel Paper, or General
Intangibles (including a payment intangible). 
 “Account Triggering Date” shall occur whenever Availability is less
than (a) the greater of (i) 12.5% of the Maximum Revolver Amount and (ii) $50,000,000 for five (5) consecutive Business Days or (b) the greater of (i) 10% of the Maximum Revolver Amount and (ii) $40,000,000 at any
time; provided that in the event Availability has been greater than the greater of (i) 12.5% of the Maximum Revolver Amount and (ii) $50,000,000 at all times for thirty (30) consecutive Business Days, then the Account Triggering Date
shall be deemed to not be continuing for purposes of this Agreement, unless a subsequent Account Triggering Date occurs. 
 “ACH
Transactions” means any cash management or related services including the automatic clearing house transfer of funds by the Bank for the account of any Borrower pursuant to agreement or overdrafts. 

“Acquisition” means any transaction or series of related transactions for the purpose of, or resulting in, directly or
indirectly, (a) the acquisition by any Person of all or substantially all of the assets of a Person or of any business or division of a Person; (b) the acquisition by any Person of more than 50% of any class of Voting Stock (or similar
ownership interests) of any Person; or (c) a merger, consolidation, amalgamation, or other combination by any Person with another Person if Westlake or a Restricted Subsidiary is the surviving entity, provided that, (i) in any
merger involving any Loan Party, a Loan Party must be the surviving entity; and (ii) for purpose of this Agreement, any Acquisition among Loan Parties is not an “Acquisition.” 

“Additional Letter of Credit Issuer” means a Lender that is designated by the Borrowers to issue any Letter of Credit
pursuant to this Agreement; provided that (a) such Lender agrees to issue Letters of Credit under this Agreement, (b) such Lender is reasonably acceptable to the Agent, and (c) the Borrowers and such Lender shall promptly
provide the Agent with a copy of each Letter of Credit issued by such Lender. 
 “Adjusted Net Earnings from
Operations” means, with respect to any fiscal period of Westlake, the consolidated net income of Westlake and its Restricted Subsidiaries after provision for income taxes for such fiscal period, as determined in accordance with GAAP and
reported on the Financial Statements for such period, excluding any and all of the following included in such net income: (a) non-recurring gain or loss arising from the sale of any capital assets; (b) non-cash gain or loss arising from
any write-up or write-down in the book value of any asset; (c) earnings of any Person, substantially 

 
all the assets of which have been acquired by such Person in any manner, to the extent realized by such other Person prior to the date of acquisition; (d) earnings of any Person (other than
a Restricted Subsidiary) in which Westlake or any Restricted Subsidiary has an ownership interest unless (and only to the extent) such earnings shall actually have been received by such Person in the form of cash distributions; (e) earnings of
any Person to which assets of Westlake or any Restricted Subsidiary shall have been sold, transferred, or disposed of, or into which Westlake or any Restricted Subsidiary shall have been merged, or which has been a party with Westlake or any
Restricted Subsidiary to any consolidation or other form of reorganization, prior to the date of such transaction; (f) gain or loss arising from the acquisition of Debt or equity security of Westlake or any Restricted Subsidiary or from
cancellation or forgiveness of Debt; and (g) gain and non-cash loss arising from any non-recurring transaction. 

“Affiliate” means, as to any Person, any other Person which, directly or indirectly, is in control of, is controlled
by, or is under common control with, such Person or which owns, directly or indirectly, five percent (5%) or more of the outstanding equity interest of such Person. A Person shall be deemed to control another Person if the controlling Person
possesses, directly or indirectly, the power to direct or cause the direction of the management and policies of the other Person, whether through the ownership of voting securities, by contract, or otherwise. In no event shall the Agent or any
Lender be deemed to be an Affiliate of any Borrower or any of their Subsidiaries 
 “Agent” means the Bank, solely
in its capacity as agent for the Lenders, and any successor agent. 
 “Agent Advances” has the meaning specified in
Section 1.2(i). 
 “Agent’s Liens” means the Liens in the Collateral granted
to the Agent, for the benefit of the Lenders, Bank, and the Agent pursuant to this Agreement and the other Loan Documents. 

“Agent Related Persons” means the Agent, together with its Affiliates, and the officers, directors, employees,
counsel, representatives, trustees, agents and attorneys-in-fact of the Agent and such Affiliates. 
 “Aggregate Revolver
Outstandings” means, at any date of determination: the sum of (a) the unpaid balance of Revolving Loans, (b) the aggregate amount of Pending Revolving Loans, (c) one hundred percent (100%) of the aggregate undrawn
face amount of all outstanding Letters of Credit, and (d) the aggregate amount of any unpaid reimbursement obligations in respect of Letters of Credit. 

“Agreement” means the Third Amended and Restated Credit Agreement dated as of July 17, 2014, by and among the
Borrowers, the Agent, and the other Lenders, as from time to time amended, modified or restated. 
 “Anniversary
Date” means each anniversary of the Closing Date. 
 “Anti-Corruption Laws” means all laws, rules, and
regulations of any jurisdiction applicable to any Loan Party or any of its Subsidiaries from time to time concerning or relating to bribery or corruption. 

 “Applicable Margin” means, 

(a) with respect to Base Rate Loans and LIBOR Rate Loans, as set forth in the pricing grid below; and 

(b) with respect to the Unused Line Fee, 0.25% per annum. 

 

									
	 Average Daily Availability
	  	Applicable Margin for
Base Rate Loans	 	 	Applicable Margin for
LIBOR Rate Loans	 
	 £ $125 million
	  	 	0.50	% 	 	 	1.75	% 
	 > $125 million but £ $ 275 million
	  	 	0.25	% 	 	 	1.50	% 
	 > $275 million
	  	 	0.00	% 	 	 	1.25	% 

 provided that so long as the long term senior unsecured debt of Westlake is rated Investment Grade, the
Applicable Margin for LIBOR Rate Loans will not exceed 1.50%. 
 The Applicable Margins for LIBOR Rate Loans and Base Rate Loans will be
adjusted monthly based upon the above pricing grid. The Average Daily Availability is calculated monthly and each new Applicable Margin shall be effective as of the first day of the subsequent month based on the Average Daily Availability with
respect to the immediately preceding month with respect to all outstanding Obligations. 
 “Approved Fund” means any
Fund that is administered or managed by (a) a Lender, (b) an Affiliate of a Lender or (c) an entity or an Affiliate of an entity that administers or manages a Lender. 

“Arranger” means Bank of America, N.A. and its successors and assigns, in its capacity as sole lead arranger and sole
book manager under the Loan Documents. 
 “Asset Swap” means any substantially contemporaneous (and in any event
occurring within 45 days of each other) purchase and sale or exchange of any properties or assets having a reasonably equivalent value. 

“Assignee” has the meaning specified in Section 11.2(a). 

“Assignment and Acceptance” has the meaning specified in Section 11.2(a). 

“Attorney Costs” means and includes all reasonable fees, expenses, and disbursements of any law firm or other counsel
engaged by the Agent or the Arranger, and the reasonably allocated costs and expenses of internal legal services of the Agent and the Arranger. 

“Availability” means, at any time (a) the lesser of (i) the Maximum Revolver Amount or (ii) the
Borrowing Base, minus (b) Reserves from time to time established by the Agent in its reasonable credit judgment without duplication to the Reserves deducted in the calculation of the Borrowing Base, minus (c) the Aggregate Revolver
Outstandings. 
 “Average Daily Availability” means, with respect to each calendar month, the average daily
Availability during such calendar month, calculated based on the most recently delivered Borrowing Base Certificate. Each adjustment of any reporting schedule in the Agreement based on the Average Daily Availability shall be effective with respect
to the subsequent quarter, month, or week, as applicable. 
 “Bank” means Bank of America, N.A., a national banking
association, or any successor entity thereto. 

 “Bank Products” means any one or more of the following types of services
or facilities extended to any Loan Party or its Affiliates (including Westlake Veba Trust) by a Lender or any Affiliate of a Lender in reliance on the Lender’s agreement to indemnify such Affiliate: (a) credit cards; (b) ACH
Transactions; (c) cash management, including controlled disbursement services; and (d) Hedge Agreements. 
 “Bank
Product Reserves” means all Reserves for Bank Products or Bank Product Termination Value which the Agent from time to time establishes for any Bank Products then provided or outstanding; provided that,
without limiting the foregoing, (a) the Agent shall not be required to establish any Bank Product Reserve with respect to any Bank Products provided by any Lender (or any of its Affiliates) for which the Agent has not received notice pursuant
to Section 7.23 (other than with respect to Bank Products of the Bank or any Affiliate of the Bank), and (b) the Agent shall not be responsible for adjusting the amount of any Bank Product Reserve from time to time without
notice from the applicable Lender (other than the Bank or any Affiliate of the Bank) to make any such adjustment, and written acknowledgment of receipt thereof, which the Agent shall deliver promptly upon receipt of such notice. 

“Bank Product Termination Value” means on any date of determination, with respect to any Bank Product (other than
under or in connection with any Bank Product with the Bank or any Affiliate of the Bank), the amount determined by the applicable Lender or its Affiliates, in accordance with the documentation evidencing the applicable Bank Product, and reported to
the Agent pursuant to Section 7.23 hereof, and in the case of the Bank or its Affiliates, shall mean with respect to Bank Products other than Hedge Agreements, the obligations of any Loan Party thereunder from time to time, and
with respect to any Hedge Agreement, shall mean the amount determined by the Bank or any Affiliate of the Bank, and reflected on the documentation and records of the Bank or of such Affiliate of the Bank; provided
however, that in no event shall the Bank Product Termination Value of any Bank Product (other than any Bank Product provided by the Bank or an Affiliate of the Bank with respect to any Bank Product which is not a Hedge Agreement)
provided by any Lender or any Affiliate of a Lender be increased at any time that a Default or Event of Default exists, or if creating a Reserve against such Bank Product Termination Value or the increase thereof would cause the Obligations to
exceed the Borrowing Base. 
 “Bankruptcy Code” means Title 11 of the United States Code (11 U.S.C.
§ 101 et seq.). 
 “Base Rate” means, for any day, a per annum rate equal to the greatest of
(a) the Prime Rate for such day; (b) the Federal Funds Rate for such day, plus 0.50%; or (c) LIBOR Rate for a 30 day interest period as determined on such day, plus 1.0%. 

“Base Rate Loan” means, a Revolving Loan during any period in which it bears interest based on the Base Rate.

 “Beneficial Owner” has the meaning assigned to such term in Rule 13d-3 and Rule 13d-5 under the Exchange
Act, except that in calculating the beneficial ownership of any particular “person” (as that term is used in Section 13(d)(3) of the Exchange Act), such
“person” will be deemed to have beneficial ownership of all securities that such “person” has the right to acquire by conversion or exercise of other
securities, whether such right is currently exercisable or is exercisable only after the passage of time. The terms “Beneficially Owns” and “Beneficially Owned” have corresponding meanings.

 “Blocked Account Agreement” means an agreement among any Loan Party, the Agent, and a Clearing Bank, in
form and substance reasonably satisfactory to the Agent, concerning the collection of payments which represent the proceeds of Accounts or of any other Collateral of such Loan Party.  

 “Bond Debt” means (a) the
6 3⁄4% Senior Notes due 2032 in an aggregate original principal amount of $250,000,000 issued pursuant to the Second Supplemental Indenture dated as of
November 1, 2007, (b) the 6.50% Senior Notes due 2029 in an aggregate original principal amount of $100,000,000 issued pursuant to the Third Supplemental Indenture dated as of July 2, 2010, (c) the 6.50% Senior Notes due 2035 in
an aggregate original principal amount of $89,000,000 issued pursuant to the Fourth Supplemental Indenture dated as of December 2, 2010, (d) the 6.50% Senior Notes due 2035 in an aggregate original principal amount of $65,000,000 issued
pursuant to the Fifth Supplemental Indenture dated as of December 2, 2010, (e) the 3.60% Senior Notes due 2022 pursuant to the Sixth Supplemental Indenture dated as of July 17, 2013 and (f) the 3.60% Senior Notes due 2022
pursuant to the Seventh Supplemental Indenture dated as of February 12, 2013, each issued by Westlake under that certain Indenture dated as of January 1, 2006 between Westlake and The Bank of New York Mellon Trust Company, N.A., as
trustee, and the documents and agreements evidencing and establishing such Debt, as the same may be amended, from time to time in accordance with the terms thereof and hereof, and including any replacements or refinancings thereof permitted under
this Agreement. 
 “Borrower” and “Borrowers” have the meaning specified in
the preamble to this Agreement. 
 “Borrower Materials” has the meaning specified in the last
paragraph of Section 5.2. 
 “Borrowing” means a borrowing hereunder consisting of
Revolving Loans made on the same day by the Lenders to the Borrowers or by the Bank in the case of a Borrowing funded by Non-Ratable Loans or by the Agent in the case of a Borrowing consisting of an Agent Advance, or the issuance of Letters of
Credit hereunder. 
 “Borrowing Base” means, at any time, an amount equal to (a) the sum of
(i) eighty-five percent (85%) of the Net Amount of Eligible Accounts; plus (ii) the lesser of (y) seventy percent (70%) of the value of the lower of cost or market of Eligible Inventory or (z) eighty-five percent
(85%) of the Net Orderly Liquidation Value of all Eligible Inventory; plus (iii) one hundred percent (100%) of Eligible Cash; minus (b) Reserves from time to time established by the Agent in its
reasonable credit judgment. 
 “Borrowing Base Certificate” means a certificate by a Responsible
Officer for the benefit of the Borrowers, substantially in the form of Exhibit B (or another form acceptable to the Agent) setting forth the calculation of the Borrowing Base, including a calculation of each component thereof, all
in such detail as shall be reasonably satisfactory to the Agent. All calculations of the Borrowing Base in connection with the preparation of any Borrowing Base Certificate shall originally be made by the Borrowers and certified to the Agent;
provided, that the Agent shall have the right to review and adjust, in the exercise of its reasonable credit judgment, any such calculation (a) to reflect its reasonable estimate of declines in value of any of
the Collateral described therein, and (b) to the extent that such calculation is not in accordance with this Agreement. 

“Business Day” means (a) any day that is not a Saturday, Sunday, or a day on which banks in Houston, Texas, New
York, New York, or Charlotte, North Carolina are required or permitted to be closed, and (b) with respect to all notices, determinations, fundings and payments in connection with the LIBOR Rate or LIBOR Rate Loans, any day that is a Business
Day pursuant to clause (a) above and that is also a day on which trading in Dollars is carried on by and between banks in the London interbank market. 

“Capital Adequacy Regulation” means any guideline, request, or directive of any central bank or other Governmental
Authority, or any other law, rule, or regulation, whether or not having the force of law, in each case, regarding capital adequacy of any bank or of any corporation controlling a bank. 

 “Capital Expenditures” means all payments due (whether or not paid during
any fiscal period) in respect of the cost of any fixed asset or improvement, or replacement, substitution, or addition thereto, which has a useful life of more than one year, including, without limitation, those costs arising in connection with the
direct or indirect acquisition of such asset by way of increased product or service charges or in connection with a Capital Lease. 

“Capital Lease” means any lease of property by a Person which, in accordance with GAAP, should be reflected as a
capital lease on the balance sheet of such Person. 
 “Capital Stock” means (a) in the case of a
corporation, capital stock, (b) in the case of an association or business entity, any and all shares, interests, participations, rights, or other equivalents (however designated) of capital stock, (c) in the case of a partnership,
partnership interests (whether general or limited), (d) in the case of a limited liability company, membership interests, and (e) any other interest or participation that confers on a Person the right to receive a share of the profits and
losses of, or distributions of assets of, the issuing Person. 
 “Cash Equivalents” means investments
of the type described in clauses (d) through (f), inclusive, and (n) through (s), inclusive, of the definition of “Restricted Investment”. 

“Change in Law” means the occurrence, after the date hereof, of (a) the adoption, taking effect or phasing in of
any law, rule, regulation or treaty; (b) any change in any law, rule, regulation or treaty or in the administration, interpretation or application thereof; or (c) the making, issuance or application of any request, guideline, requirement
or directive (whether or not having the force of law) by any Governmental Authority; provided, however, that “Change in Law” shall include, regardless of
the date enacted, adopted or issued, all requests, rules, guidelines, requirements or directives (i) under or relating to the Dodd-Frank Wall Street Reform and Consumer Protection Act, or (ii) promulgated pursuant to Basel III by the Bank
for International Settlements, the Basel Committee on Banking Supervision (or any similar authority) or any other Governmental Authority.  

“Change of Control” means the occurrence of any of the following: (a) the direct or indirect sale, transfer,
conveyance, or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the properties or assets of Westlake and its Subsidiaries taken as a whole to any
“person” (as that term is used in Section 13(d) of the Exchange Act) other than a Principal or a Related Party of a Principal; (b) the adoption of a plan relating to the liquidation or dissolution of Westlake;
(c) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” (as defined above), other than the Principals and their Related Parties or a
Permitted Group, becomes the Beneficial Owner, directly or indirectly, of more than 50% of the Voting Stock of Westlake, measured by voting power rather than number of shares, other than in any transaction that complies with clause
(d) herein; (d) Westlake consolidates with, or merges with or into, any Person, or any Person consolidates with, or merges with or into, Westlake, in any such event pursuant to a transaction in which any of the outstanding Voting
Stock of Westlake or such other Person is converted into or exchanged for cash, securities, or other property, other than any such transaction where the Voting Stock of Westlake outstanding immediately prior to such transaction is converted into or
exchanged for Voting Stock (other than Disqualified Stock) of the surviving or transferee Person constituting a majority of the outstanding shares of such Voting Stock of such surviving or transferee Person (immediately after giving effect to such
issuance); or (e) the first day on which a majority of the members of the board of directors of Westlake are not Continuing Directors.  

 “Chattel Paper” means all of any Loan Party’s now owned or hereafter
acquired chattel paper, as defined in the UCC, including electronic chattel paper. 
 “Clearing Bank” means the Bank
or any other banking institution with whom a Payment Account has been established pursuant to a Blocked Account Agreement. 

“Closing Date” means the date of this Agreement. 

“Closing Fee” has the meaning specified in Section 2.4. 

“Code” means the Internal Revenue Code of 1986. 

“Collateral” means, subject to the terms of the Security Agreement, (a) all of each Loan Party’s Inventory,
Accounts, Instruments, Chattel Paper, Deposit Accounts, Documents, and Related General Intangibles; and (b) all other assets of any Person from time to time subject to the Agent’s Liens securing payment or performance of the Obligations,
but in any event excluding the Excluded Assets (as such term is defined in the Security Agreement). 
 “Collateral
Documents” means all Security Agreements, pledge agreements, Copyright Security Agreements, Patent and Trademark Agreements, financing statements, assignments of partnership interests, Obligation Guaranties, and mortgages at any time
delivered to the Agent to create or evidence Liens securing the Obligations, together with all reaffirmations, amendments, and modifications thereof or supplements thereto. 

“Commitment” means, at any time with respect to a Lender, the principal amount set forth beside such Lender’s
name under the heading “Commitment” on Schedule 1.2 attached to the Agreement or on the signature page of the Assignment and Acceptance pursuant to which such Lender became a Lender hereunder in accordance
with the provisions of Section 11.2, as such Commitment may be adjusted from time to time in accordance with the provisions of Sections 1.2(j) or 11.2, and “Commitments”
means, collectively, the aggregate amount of the commitments of all of the Lenders. 
 “Commodity Exchange
Act” means the Commodity Exchange Act (7 U.S.C. § 1 et seq.). 
 “Connection Income Taxes” means
Other Connection Taxes that are imposed on or measured by net income (however denominated), or are franchise or branch profits Taxes. 

“Contaminant” means any waste, pollutant, hazardous substance, toxic substance, hazardous waste, special waste,
petroleum or petroleum-derived substance or waste, asbestos in any form or condition, PCBs, or any constituent of any such substance or waste. 

“Continuation/Conversion Date” means the date on which a Loan is converted into or continued as a LIBOR Rate Loan.

 “Continuing Directors” means, as of any date of determination, any member of the board of directors of Westlake
who (a) was a member of such board of directors on the Closing Date or (b) was nominated for election or elected or appointed to such board of directors with the approval of, or whose nomination for election by the stockholders was
approved by, a majority of the Continuing Directors who were members of such board of directors at the time of such nomination, appointment, or election. 

 “Copyright Security Agreement” means any Copyright Security Agreement,
executed and delivered by any Loan Party to the Agent, for the benefit of the Agent and the Lenders, to evidence and perfect the Agent’s security interest in the Loan Parties’ present and future copyrights and related licenses and rights,
as amended, restated, amended and restated, or otherwise modified from time to time. 
 “Credit Support” has the
meaning specified in Section 1.3(a). 
 “Debt” means, without duplication, all liabilities, obligations, and
indebtedness of Westlake or any Restricted Subsidiary to any other Person, of any kind or nature, now or hereafter owing, arising, due or payable, howsoever evidenced, created, incurred, acquired or owing, whether primary, secondary, direct,
contingent, fixed or otherwise, consisting of indebtedness for borrowed money, the deferred purchase price of property, or preferred stock or other equity interests that have characteristics of Debt such as, dividend requirements (whether cash or
paid in kind) or, in the case of Disqualified Stock, mandatory redemption requirements, excluding trade payables, but including (a) all Obligations; (b) all obligations and liabilities of any Person secured by any Lien (other than a
Limited Recourse Stock Pledge) on property of Westlake or any Restricted Subsidiary, even though Westlake or any Restricted Subsidiary shall not have assumed or become liable for the payment thereof; provided, however, that all such
obligations and liabilities which are limited in recourse to such property shall be included in Debt only to the extent of the book value of such property as would be shown on a balance sheet of such Person prepared in accordance with GAAP;
(c) all obligations or liabilities created or arising under any Capital Lease or conditional sale or other title retention agreement with respect to property used or acquired by Westlake or any Restricted Subsidiary, even if the rights and
remedies of the lessor, seller or lender thereunder are limited to repossession of such property; provided, however, that all such obligations and liabilities which are limited in recourse to such property shall be included in Debt
only to the extent of the book value of such property as would be shown on a balance sheet of Westlake prepared in accordance with GAAP; (d) all obligations and liabilities under Guaranties of another Person of borrowed money; and (e) the
present value (discounted at the Base Rate) of lease payments due under synthetic leases. 
 “Default” means any
event or circumstance which, with the giving of notice, the lapse of time, or both, would (if not cured, waived, or otherwise remedied during such time) constitute an Event of Default. 

“Default Rate” means a fluctuating per annum interest rate at all times equal to the sum of (a) the otherwise
applicable Interest Rate plus (b) two percent (2%) per annum. Each Default Rate shall be adjusted simultaneously with any change in the applicable Interest Rate. In addition, the Default Rate shall result in an increase in the Letter of
Credit Fee by two (2) percentage points per annum. 
 “Defaulting Lender” means any Lender that (a) has
failed to comply with its funding obligations hereunder, and such failure is not cured within two Business Days, unless such Lender notifies the Agent and Westlake in writing that such failure is the result of such Lender’s determination that
one or more conditions precedent to funding (each of which conditions precedent, together with any applicable default, shall be specifically identified in such writing) has not been satisfied; (b) has notified the Agent or any Borrower that
such Lender does not intend to comply with its funding obligations hereunder, or has made a public statement to that effect, unless such writing or public statement relates to such Lender’s obligation to fund a Loan hereunder and states that
such position is based on such Lender’s determination that a condition precedent to funding (which condition precedent, together with any applicable default, shall be specifically identified in such writing or public statement) cannot be
satisfied; (c) has failed, within three Business Days following request by the Agent or any Borrower, to confirm in a manner satisfactory to the Agent and Borrowers that such Lender will comply with its funding obligations hereunder,
provided that such Lender shall cease to be a Defaulting Lender pursuant to this 

 
clause (c) upon receipt of such written confirmation by the Agent and Westlake; or (d) has, or has a direct or indirect parent company that has, become the subject of an
Insolvency Proceeding (including reorganization, liquidation, or appointment of a receiver, custodian, administrator or similar Person by the Federal Deposit Insurance Corporation or any other regulatory authority); provided, however, that a Lender
shall not be a Defaulting Lender solely by virtue of a Governmental Authority’s ownership of an equity interest in such Lender or parent company unless the ownership provides immunity for such Lender from jurisdiction of courts within the
United States or from enforcement of judgments or writs of attachment on its assets, or permits such Lender or Governmental Authority to repudiate or otherwise to reject such Lender’s agreements. 

“Deposit Accounts” means all “deposit accounts” as such term is defined in the UCC, now or hereafter
held in the name of any Loan Party, including, without limitation, the Payment Accounts, but excluding the Flexible Spending Account No. 4426569503 maintained by Westlake Chemical Corporation at Bank of America, N.A. or any substitute or
replacement account of such Flexible Spending Account. 
 “Designated Account” has the meaning specified in
Section 1.2(c). 
 “Designated Project Expenditures” means non-recurring (i.e., not for
maintenance purposes) project-related Capital Expenditures incurred by a Loan Party or its Restricted Subsidiaries and funded (a) with Debt other than Revolving Loans (but including, without duplication, principal payments with respect to such
Debt) or (b) cash on hand (other than proceeds of Revolving Loans), to the extent the applicable Loan Party designates such project in writing to the Agent as a “Pre-Funded Capital Project” prior to the incurrence of any
Designated Project Expenditures. A Loan Party may de-designate a Pre-Funded Capital Project, but once “de-designated,” the same project may not be designated as a Pre-Funded Capital Project. To the extent any Revolving Loan remains
outstanding while there is a Pre-Funded Capital Project, the Agent may establish Reserves against the estimated Designated Project Expenditures to be incurred during the next twelve (12) months in connection with such Pre-Funded Capital
Project. 
 “Disqualified Stock” means any Capital Stock that, by its terms (or by the terms of any security into
which it is convertible, or for which it is exchangeable, in each case at the option of the holder of the Capital Stock), or upon the happening of any event, matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise,
or redeemable at the option of the holder of the Capital Stock, in whole or in part, on or prior to the date that is 91 days after the Stated Termination Date. Notwithstanding the preceding sentence, any Capital Stock that would constitute
Disqualified Stock solely because the holders of the Capital Stock have the right to require Westlake to repurchase such Capital Stock upon the occurrence of a change of control or an asset sale will not constitute Disqualified Stock if the terms of
such Capital Stock provide that Westlake may not repurchase or redeem any such Capital Stock pursuant to such provisions unless such repurchase or redemption complies with Section 7.10. The amount of Disqualified Stock deemed to
be outstanding at any time for purposes of this Agreement will be the maximum amount that Westlake and its Restricted Subsidiaries may become obligated to pay upon the maturity of, or pursuant to any mandatory redemption provisions of, such
Disqualified Stock, exclusive of accrued dividends. 
 “Distribution” means, in respect of any corporation, limited
partnership, or limited liability company: (a) the payment or making of any dividend or other distribution of property in respect of capital stock, partnership interest, or membership interest, as applicable (or any options or warrants for, or
other rights with respect to, such stock, partnership interest, or membership interest, as applicable) of such corporation, limited partnership, or limited liability company, other than distributions in capital stock, partnership interest, or
membership interest, as applicable (or any options or warrants for such 

 
stock, partnership interest, or membership interest, as applicable) of the same class; or (b) the redemption or other acquisition by such corporation, limited partnership, or limited
liability company of any capital stock, partnership interest, or membership interest, as applicable (or any options or warrants for such stock, partnership interest, or membership interest, as applicable) of such corporation, limited partnership, or
limited liability company. 
 “Documents” means all documents as such term is defined in the UCC, including bills of
lading, warehouse receipts or other documents of title, now owned or hereafter acquired by any Loan Party. 

“DOL” means the United States Department of Labor or any successor department or agency. 

“Dollar” and “$” means dollars in the lawful currency of the United States. Unless otherwise
specified, all payments under this Agreement shall be made in Dollars. 
 “Domestic Subsidiary” of any
Person means a direct or indirect Subsidiary of such Person that is organized or incorporated under the laws of a jurisdiction of the United States, other than a direct or indirect Subsidiary of a Foreign Subsidiary of such Person.

 “EBITDA” means, with respect to any fiscal period of the Loan Parties, Adjusted Net Earnings from
Operations, plus, to the extent deducted in the determination of Adjusted Net Earnings from Operations for that fiscal period, interest expenses, interest on financed insurance premiums permitted pursuant to Section 7.13(h),
Federal, state, local and foreign income taxes, depreciation and amortization. 
 “Eligible Accounts”
means the Accounts which the Agent in the exercise of its reasonable commercial discretion determines to be Eligible Accounts. Without limiting the discretion of the Agent to establish other criteria of ineligibility
(provided that the Agent shall notify Westlake of other criteria of ineligibility five (5) days prior to the effectiveness thereof), Eligible Accounts shall not, unless the Agent in its sole discretion elects,
include any Account: 
 (a) with respect to which more than ninety (90) days have elapsed since the date
of the original invoice therefor or which is more than sixty (60) days past due (without duplication); 
 (b) with
respect to which any of the representations, warranties, covenants, and agreements contained in the Security Agreement are incorrect or have been breached; 

(c) with respect to which Account (or any other Account due from such Account Debtor), in whole or in part, a check, promissory
note, draft, trade acceptance or other instrument for the payment of money has been received, presented for payment, and returned uncollected for any reason; 

(d) which represents a progress billing (as hereinafter defined) or as to which any Loan Party has extended the time for
payment without the consent of the Agent; for the purposes hereof, “progress billing” means any invoice for goods sold or leased or services rendered under a contract or agreement pursuant to which the Account
Debtor’s obligation to pay such invoice is conditioned upon any Loan Party’s completion of any further performance under the contract or agreement; 

 (e) with respect to which any one or more of the following events has occurred to
the Account Debtor on such Account: death or judicial declaration of incompetency of an Account Debtor who is an individual; the filing by or against the Account Debtor of a request or petition for liquidation, reorganization, arrangement,
adjustment of debts, adjudication as a bankrupt, winding-up, or other relief under the bankruptcy, insolvency, or similar laws of the United States, any state or territory thereof, or any foreign jurisdiction, now or hereafter in effect; the making
of any general assignment by the Account Debtor for the benefit of creditors; the appointment of a receiver or trustee for the Account Debtor or for any of the assets of the Account Debtor, including, without limitation, the appointment of or taking
possession by a “custodian,” as defined in the Federal Bankruptcy Code; the institution by or against the Account Debtor of any other type of insolvency proceeding (under the bankruptcy laws of the United States or otherwise) or of
any formal or informal proceeding for the dissolution or liquidation of, settlement of claims against, or winding up of affairs of, the Account Debtor; the sale, assignment, or transfer of all or any material part of the assets of the Account
Debtor; the nonpayment generally by the Account Debtor of its debts as they become due; or the cessation of the business of the Account Debtor as a going concern; or the Account Debtor is subject to Sanctions or any specially designated nationals
list maintained by OFAC; 
 (f) if fifty percent (50%) or more of the aggregate Dollar amount of outstanding Accounts
owed at such time by the Account Debtor thereon is classified as ineligible under clause (a) above; 
 (g)
owed by an Account Debtor which: (i) does not maintain its chief executive office in the United States of America or Canada; or (ii) is not organized under the laws of the United States of America or any state thereof; or (iii) is the
government of any foreign country or sovereign state, or of any state, province, municipality, or other political subdivision thereof, or of any department, agency, public corporation, or other instrumentality thereof (“Foreign Account
Debtors”); other than (x) such accounts backed by letters of credit issued or confirmed by a bank reasonably acceptable to the Agent and in form and substance acceptable to the Agent in its sole discretion and (y) up to
$10,000,000 of accounts owed by Foreign Account Debtors, which are insured by credit insurance, provided that both such accounts and such credit insurance are acceptable to the Agent, in its sole discretion; 

(h) owed by an Account Debtor which is another Loan Party or an Affiliate or employee of any Loan Party; 

(i) except as provided in clause (k) below, with respect to which either the perfection, enforceability, or
validity of the Agent’s Liens in such Account, or the Agent’s right or ability to obtain direct payment to the Agent of the proceeds of such Account, is governed by any federal, state, or local statutory requirements other than those of
the UCC; 
 (j) owed by an Account Debtor to which any Loan Party is indebted in any way, or which is subject to any right of
setoff or recoupment by the Account Debtor, unless the Account Debtor has entered into an agreement acceptable to the Agent to waive setoff rights; or if the Account Debtor thereon has disputed liability or made any claim with respect to any other
Account due from such Account Debtor; but in each such case only to the extent of such indebtedness, setoff, recoupment, dispute, or claim, and other Accounts owing pursuant to performance contracts which the Agent determines in its reasonable
credit judgment could be set off in the event of any Loan Party’s default thereunder; 

 (k) owed by the government of the United States of America, or any department,
agency, public corporation, or other instrumentality thereof, unless the Federal Assignment of Claims Act of 1940, as amended (31 U.S.C. § 3727 et seq.), and any other steps necessary to perfect the Agent’s Liens therein, have been
complied with to the Agent’s satisfaction with respect to such Account; 
 (l) owed by any state, municipality, or other
political subdivision of the United States of America, or any department, agency, public corporation, or other instrumentality thereof and as to which the Agent determines that its Lien therein is not or cannot be perfected; 

(m) which represents a sale on a bill-and-hold, guaranteed sale, sale and return, sale on approval, consignment, or other
repurchase or return basis, a sale on cash on delivery terms, or the remaining balances on Accounts that were short paid by an Account Debtor and are evidenced by debit memoranda; 

(n) which is evidenced by a promissory note or other instrument or by chattel paper; 

(o) if the Agent believes, in the exercise of its reasonable judgment, that the prospect of collection of such Account is
impaired or that the Account may not be paid by reason of the Account Debtor’s financial inability to pay; 
 (p) with
respect to which the Account Debtor is located in any state requiring the filing of a Notice of Business Activities Report or similar report in order to permit a Loan Party to seek judicial enforcement in such State of payment of such Account,
unless such Loan Party has qualified to do business in such state or has filed a Notice of Business Activities Report or equivalent report for the then-current year; 

(q) which arises out of a sale not made in the ordinary course of any Loan Party’s business; 

(r) with respect to which the goods giving rise to such Account have not been shipped and delivered to and accepted by the
Account Debtor or the services giving rise to such Account have not been performed by a Loan Party, and, if applicable, accepted by the Account Debtor, or the Account Debtor revokes its acceptance of such goods or services; 

(s) owed by an Account Debtor or a group of affiliated Account Debtors which is obligated to one or more Loan Parties
respecting Accounts the aggregate unpaid balance of which exceeds fifteen percent (15%) of the aggregate unpaid balance of all Accounts owed to the Loan Parties at such time by all of the Loan Parties’ Account Debtors, but only to the
extent of such excess; 
 (t) which is not subject to a first priority and perfected security interest in favor of the Agent
for the benefit of the Lenders, or that are subject to any other Lien whatsoever (other than the Liens described in clause (a) of the definition of Permitted Liens; provided that such Permitted Liens (i) are junior in
priority to the Agent’s Liens or subject to Reserves and (ii) do not impair directly or indirectly the ability of the Agent to realize on or obtain the full benefit of the Collateral); 

(u) owed by an Account Debtor pursuant to a performance contract (including, without limitation, any exchange contracts), which
the Agent determines in its reasonable credit judgment could be set off in the event of any Loan Party’s default thereunder; or 

 (v) on and after a Default, Event of Default, or the Account Triggering Date,
with respect to which the Agent does not have control of the Payment Accounts. 
 If any Account at any time ceases to be an Eligible Account, then such
Account shall promptly be excluded from the calculation of Eligible Accounts. 
 “Eligible Assignee” means
(a) a commercial bank, commercial finance company, or other asset based lender, having total assets in excess of $1,000,000,000; (b) any Lender listed on the signature page of this Agreement; (c) any Affiliate of any Lender;
(d) an Approved Fund; and (e) if an Event of Default has occurred and is continuing, any Person reasonably acceptable to the Agent.  

“Eligible Cash” means cash held in the account entitled “Westlake Chemical Corporation FBO Bank of America, N.A.,
as Collateral Pledgee Cash Collateral Account” maintained at the Bank, which account shall be subject to a control agreement in form and substance satisfactory to the Agent. 

“Eligible Inventory” means Inventory, valued at the lower of cost (on a first-in, first-out basis) or market, which
the Agent, in the exercise of its reasonable commercial discretion, determines to be Eligible Inventory. Without limiting the discretion of the Agent to establish other criteria of ineligibility (provided that the
Agent shall notify Westlake of other criteria of ineligibility five (5) days prior to the effectiveness thereof), Eligible Inventory shall not, unless the Agent in its sole discretion elects, include any Inventory:  

(a) that is not owned by a Loan Party; 

(b) that is not subject to the Agent’s Liens, which are perfected as to such Inventory, or that are subject to any other
Lien whatsoever (other than the Liens described in clauses (a) and (d) of the definition of Permitted Liens; provided that such Permitted Liens (i) are junior in priority to the Agent’s Liens or
subject to Reserves and (ii) do not impair directly or indirectly the ability of the Agent to realize on or obtain the full benefit of the Collateral); 

(c) that does not consist of finished goods or raw materials; 

(d) that consists of work-in-process, spare parts, scrap Inventory, additive, compounds, regrinds, samples, prototypes,
supplies, or packing and shipping materials; 
 (e) that is not in good condition, is unmerchantable, is defective, or does
not meet all standards imposed by any Governmental Authority, having regulatory authority over such goods, their use or sale; 

(f) that is not currently either usable or salable, at prices approximating at least cost, in the normal course of any Loan
Party’s business, or that is slow moving or stale; 
 (g) that is obsolete or returned or repossessed or used goods
taken in trade; 
 (h) that is located outside the United States of America or has been acquired from an entity subject to
Sanctions or any specially designated nationals list maintained by OFAC; 
 (i) that is located in a public warehouse or in
possession of a bailee or in a facility leased by any Person, provided that any Inventory that is located in a facility leased by any Loan Party will be Eligible Inventory to the extent the value of Inventory in such location equals or

 
exceeds $250,000, if (x) a reserve, acceptable to the Agent, for rents or storage charges has been established for inventory at such location or (y) bailee letters and lien releases or
subordinations in form and substance acceptable to the Agent have been obtained with respect to such leased location; 
 (j)
that contains or bears any Proprietary Rights licensed to a Loan Party by any Person, if the Agent is not satisfied that it may sell or otherwise dispose of such Inventory in accordance with the terms of the Security Agreement and
Section 9.2 without infringing the rights of the licensor of such Proprietary Rights or violating any contract with such licensor (and without payment of any royalties other than any royalties due with respect to the sale or
disposition of such Inventory pursuant to the existing license agreement), and, as to which such Loan Party has not delivered to the Agent a consent or sublicense agreement from such licensor in form and substance acceptable to the Agent if
requested; 
 (k) that is not reflected in the details of a current perpetual inventory report; 

(l) that is placed on consignment; 

(m) that is located in third party pipelines for which (i) bailee letters and lien releases or subordinations in form and
substance acceptable to the Agent have not been obtained or (ii) reserves acceptable to the Agent have not been established; 

(n) that is located with vendors to whom any Loan Party has any accounts payable to the extent of such accounts payable
balance; 
 (o) that has been capitalized on the Financial Statements of any Loan Party; 

(p) to the extent that it reflects intercompany profit; or 

(q) that is located on customer leased tracks; or 

(r) that is in transit, other than Inventory in transit from a facility of a Loan Party to that of another Loan Party. 

If any Inventory at any time ceases to be Eligible Inventory, such Inventory shall promptly be excluded from the calculation of Eligible Inventory. 

“Environmental Claims” means all claims, however asserted, by any Governmental Authority or other Person alleging
potential liability or responsibility for violation of any Environmental Law, or for a Release or injury to the environment. 

“Environmental Compliance Reserve” means any reserve which the Agent establishes in its reasonable discretion after
prior written notice to the Borrowers from time to time for amounts that are reasonably likely to be expended by the Loan Parties in order for the Loan Parties and their operations and property (a) to comply with any notice from a Governmental
Authority asserting material non-compliance with Environmental Laws, or (b) to correct any such material non-compliance identified in a report delivered to the Agent and the Lenders pursuant to Section 7.7. 

“Environmental Laws” means all federal, state or local laws, statutes, common law duties, rules, regulations,
ordinances and codes, together with all administrative orders, directed duties, licenses, authorizations and permits of, and agreements with, any Governmental Authority, in each case relating to environmental, health, safety and land use
matters. 

 “Environmental Liability” means any obligation, liability (including,
without limitation, any strict liability), loss, fine, penalty, charge, Lien, damage, cost, reasonable attorneys’ and expert fees, or any other expense arising under, or resulting from a violation of any Environmental Law, the presence,
Release, or threatened Release of any Hazardous Materials, or actual or threatened damages to natural resources. 

“Environmental Lien” means a Lien in favor of any Governmental Authority for (a) any liability under
Environmental Laws, or (b) damages arising from, or costs incurred by such Governmental Authority in response to, a Release or threatened Release. 

“Environmental Permit” means any permit, license, or other authorization from any Governmental Authority that is
required under any Environmental Law for the lawful conduct of any business, process, or other activity. 

“Equipment” means all of any Loan Party’s now owned and hereafter acquired machinery, equipment, furniture,
furnishings, fixtures, and other tangible personal property (except Inventory), including embedded software, motor vehicles with respect to which a certificate of title has been issued, aircraft, dies, tools, jigs, molds, and office equipment, as
well as all of such types of property leased by any Loan Party and all of any Loan Party’s rights and interests with respect thereto under such leases (including, without limitation, options to purchase); together with all present and future
additions and accessions thereto, replacements therefor, component and auxiliary parts and supplies used or to be used in connection therewith, and all substitutes for any of the foregoing, and all manuals, drawings, instructions, warranties and
rights with respect thereto; wherever any of the foregoing is located. 
 “Equity Issuance” means the issuance on
and after the Closing Date by any Loan Party of any shares of any class of stock, warrants, or other Capital Stock, other than present and future shares of stock, options, or warrants issued to employees, or directors of any Loan Party under any
Loan Party’s stock option or other benefit or compensation plans or arrangements, or stock issued upon their exercise. 

“ERISA” means the Employee Retirement Income Security Act of 1974, and regulations promulgated thereunder. 

“ERISA Affiliate” means any trade or business (whether or not incorporated) under common control with any Loan Party
within the meaning of Section 414(b) or (c) of the Code (and Sections 414(m) and (o) of the Code for purposes of provisions relating to Section 412 of the Code). 

“ERISA Event” means (a) a Reportable Event with respect to a Pension Plan, (b) a withdrawal by any Loan
Party or any ERISA Affiliate from a Pension Plan subject to Section 4063 of ERISA during a plan year in which it was a substantial employer (as defined in Section 4001(a)(2) of ERISA) or a cessation of operations which is treated as such a
withdrawal under Section 4062(e) of ERISA, (c) a complete or partial withdrawal by any Loan Party or any ERISA Affiliate from a Multi-employer Plan or notification that a Multi-employer Plan is in reorganization, (d) the filing of a
notice of intent to terminate, the treatment of a Plan amendment as a termination under Section 4041 or 4041A of ERISA, or the commencement of proceedings by the PBGC to terminate a Pension Plan or Multi-employer Plan, (e) the occurrence
of an event or condition which might reasonably be expected to constitute grounds under Section 4042 of ERISA for the termination of, or the appointment of a trustee to administer, any Pension Plan or Multi-employer Plan, (f) the
imposition of any liability to PBGC under Title IV of ERISA, other than for PBGC premiums due but not delinquent under Section 4007 of ERISA, upon any Loan Party or any ERISA Affiliate, or (g) a Pension Plan becomes subject to the at-risk
requirements in Section 303 of ERISA and Section 430 of the Code. 

 “Eurodollar Reserve Percentage” means, for any day during any Interest
Period, the reserve percentage (expressed as a decimal, rounded upward to the next 1/100th of 1%) in effect on such day applicable to member banks under regulations issued from time to time by the Federal Reserve Board for determining the maximum
reserve requirement (including any emergency, supplemental, or other marginal reserve requirement) with respect to Eurocurrency funding (currently referred to as “Eurocurrency liabilities”). The LIBOR Rate for each outstanding LIBOR
Rate Loan shall be adjusted automatically as of the effective date of any change in the Eurodollar Reserve Percentage. 
 “Event
of Default” has the meaning specified in Section 9.1. 
 “Exchange
Act” means the Securities Exchange Act of 1934, and regulations promulgated thereunder. 
 “Excluded
Subsidiary” means (a) each Restricted Subsidiary (other than Westlake Chemical OpCo LP and any Restricted Subsidiary thereof) that is not a wholly owned Restricted Subsidiary on any date such Restricted Subsidiary would otherwise
be required to become a Guarantor pursuant to the Agreement (for so long as such Subsidiary remains a non-wholly owned Restricted Subsidiary), and (b) each Restricted Subsidiary that is prohibited by any applicable and contractual requirement
or requirement of law from guaranteeing or granting Liens to secure the Obligations existing at the time such Subsidiary becomes a Restricted Subsidiary of Westlake (and for so long as such restriction or any replacement or renewal thereof is in
effect), provided that Westlake may not permit any such contractual requirement to be imposed on any Restricted Subsidiary for the purpose of making such Restricted Subsidiary an Excluded Subsidiary. 

“Excluded Swap Obligation” means, with respect to a Loan Party, each Swap Obligation as to which, and only to the
extent that, such Loan Party’s guaranty of or grant of a Lien as security for such Swap Obligation is or becomes illegal under the Commodity Exchange Act because such Loan Party does not constitute an “eligible contract participant”
as defined in the act (determined after giving effect to any keepwell, support or other agreement for the benefit of such Loan Party and all guarantees of Swap Obligations by other Loan Parties) when such guaranty or grant of Lien becomes effective
with respect to the Swap Obligation. If a Hedge Agreement governs more than one Swap Obligation, only the Swap Obligation(s) or portions thereof described in the foregoing sentence shall be Excluded Swap Obligation(s) for the applicable Loan Party.

 “Excluded Tax” means (a) Taxes imposed on or measured by a Recipient’s net income (however
denominated), franchise Taxes and branch profits Taxes, in each case, (i) imposed as a result of such Recipient being organized under the laws of, or having its principal office or applicable Lending Office located in, the jurisdiction imposing
such Tax, or (ii) constituting Other Connection Taxes; (b) U.S. federal withholding Taxes imposed on amounts payable to or for the account of a Lender with respect to its interest in a Loan or Commitment pursuant to a law in effect when
the Lender acquires such interest (except pursuant to an assignment requested by Westlake under Section 4.10) or changes its Lending Office, unless the Taxes were payable to its assignor immediately prior to such assignment or to
the Lender immediately prior to its change in Lending Office; (c) Taxes attributable to a Recipient’s failure to comply with Section 4.2; and (d) U.S. federal withholding Taxes imposed pursuant to FATCA. 

“Existing Credit Agreement” has the meaning specified in the recitals. 

 “Existing Letters of Credit” means all “Letters of
Credit” issued and outstanding under the Existing Credit Agreement. 
 “FATCA” means Sections 1471
through 1474 of the Code (including any amended or successor version if substantively comparable and not materially more onerous to comply with), and any current or future regulations or official interpretations thereof, any agreements entered into
pursuant to Section 1471(b)(1) of the Code, any published intergovernmental agreement entered into in connection with the implementation of such sections of the Internal Revenue Code and any fiscal or regulatory legislation, rules or official
practices adopted pursuant to any such published intergovernmental agreement. 
 “FDIC” means the Federal Deposit
Insurance Corporation, and any Governmental Authority succeeding to any of its principal functions. 
 “Federal Funds
Rate” means, for any day, (a) the weighted average of interest rates on overnight federal funds transactions with members of the Federal Reserve System arranged by federal funds brokers on the applicable Business Day (or on the
preceding Business Day, if the applicable day is not a Business Day), as published by the Federal Reserve Bank of New York on the next Business Day; or (b) if no such rate is published on the next Business Day, the average rate (rounded up, if
necessary, to the nearest 1/8 of 1%) charged to the Agent on the applicable day on such transactions, as determined by the Agent. 

“Federal Reserve Board” means the Board of Governors of the Federal Reserve System or any successor thereto. 

“Fee Letter” means that certain letter agreement relating to certain fees dated as of June 25, 2014, between
Westlake, the Bank, and the Arranger. 
 “Financial Statements” means, according to the context in which it is used,
the financial statements referred to in Sections 5.2 and 6.6 or any other financial statements required to be given to the Lenders pursuant to this Agreement. 

“Fiscal Year” means the Loan Parties’ fiscal year for financial accounting purposes. The current Fiscal Year of
the Loan Parties will end on December 31, 2011. 
 “Fixed Charge Coverage Ratio” means, with respect to any
fiscal period of the Loan Parties, the ratio of EBITDA during the preceding twelve (12) months to Fixed Charges during such twelve (12) month period. 

“Fixed Charges” means, with respect to any fiscal period of the Loan Parties on a consolidated basis (excluding
Unrestricted Subsidiaries), without duplication, (a) interest expense, (b) Capital Expenditures, (c) scheduled principal payments of Debt, prepayments and unscheduled payments (except (i) in connection with a Concurrent permitted
refinancing, replacement, or defeasance or (ii) pursuant to Section 7.14(a)(iv) or (vi) or 7.14(b)(ii) or (iv)) of Debt, (d) payments on any deferred payment plan for
insurance premiums permitted pursuant to Section 7.13(h), (e) cash Distributions paid by any Loan Party to Persons other than Westlake and its Restricted Subsidiaries, other than Distributions made by Westlake Chemical OpCo
LP to Westlake Chemical Partners LP, and (f) Federal, state, local, and foreign income taxes, excluding deferred taxes. For the purposes of this definition of “Fixed Charges”, Capital Expenditures shall not
include, without duplication, (i) Designated Project Expenditures; (ii) Capital Expenditures funded (A) from the net cash proceeds of, or in exchange for, a Concurrent Equity Issuance by Westlake (other than to another Loan Party or a
Subsidiary); or (B) from 

 
any insurance proceeds and condemnation awards permitted to be applied to Capital Expenditures hereunder; or (C) from any Concurrent cash distribution by an Unrestricted Subsidiary;
(iii) the amount by which the gross amount of the purchase price of any Equipment is reduced by (A) the credit granted by the seller of Equipment purchased by a Loan Party in connection with the trade-in of an existing Equipment and
(B) the proceeds of a sale of used or surplus fixed assets; (iv) Asset Swaps; and (v) any Capital Expenditures funded with the GO Zone/Ike Zone debt. Capital Expenditures incurred for maintenance purposes, regardless of sources of
funding, shall be included in the calculation of Fixed Charges unless such expenditures are funded from (i) the net cash proceeds of, or in exchange for, a Concurrent Equity Issuance by Westlake (other than to another Loan Party or a
Subsidiary) or (ii) the proceeds from the GO Zone/Ike Zone debt or (iii) from a Concurrent cash distribution by an Unrestricted Subsidiary. As used in this definition, “Concurrent” shall be not more than 45 days
prior to the payment or incurrence of such Capital Expenditure or such permitted refinancing, replacement, or defeasance, as the case may be. 

“Foreign Lender” means any Lender that is not a U.S. Person. 

“Foreign Subsidiary” of any Person means a Subsidiary of such Person that is organized or incorporated under the laws
of a jurisdiction other than a jurisdiction of the United States. 
 “Fronting Exposure” means a Defaulting
Lender’s Pro Rata Share of the Letter of Credit Obligations, as applicable, except to the extent allocated to other Lenders under Section 12.14(c). 

“Full Payment” means, with respect to any Obligations, (a) the full and indefeasible cash payment thereof,
including any interest, fees and other charges accruing during any insolvency proceeding under the Bankruptcy Code, or under any other bankruptcy or insolvency law (whether or not allowed in the proceeding); (b) the cancellation and return of
all outstanding Letters of Credit (or, in the alternative, with respect to Letters of Credit, providing (i) cash collateral for all remaining Letters of Credit in an amount equal to 110% of the aggregate face amount of such Letters of Credit or
(ii) a back-up letter of credit for each such Letter of Credit in form and substance and from an issuer acceptable to the Agent in its sole discretion); (c) with respect to any LIBOR Rate Loans prepaid, payment of the amounts due under
Section 4.5, if any; and (d) a release of any and all liabilities, obligations, losses, damages, penalties, judgments, proceedings, interest, costs and expenses of any kind (including remedial response costs, and reasonable
attorneys’ fees) at any time of any Loan Party and any other Person that is liable for payment of any Obligations or that has granted a Lien in favor of the Agent on its assets to secure any Obligations against the Agent, any Lender, and any
Letter of Credit Issuer arising on or before the payment date. No Revolving Loans shall be deemed to have been paid in full until all Commitments related to such Revolving Loans have expired or been terminated. 

“Fund” means any Person (other than a natural person) that is (or will be) engaged in making, purchasing, holding or
otherwise investing in commercial loans and similar extensions of credit in the ordinary course of its activities. 
 “Funding
Date” means the date on which a Borrowing occurs. 
 “GAAP” means generally accepted accounting
principles and practices set forth from time to time in the opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting
Standards Board (or agencies with similar functions of comparable stature and authority within the U.S. accounting profession), which are applicable to the circumstances as of the Closing Date. 

 “Gas Supply/Purchase Agreement” means that certain service contract
(together with any supplement, annex, or exhibit thereto) to be entered into between a Loan Party and the City of Westlake, Louisiana, in substantially the form provided to the Agent on or before September 30, 2008, or other natural gas supply
and purchase agreements with other municipalities, pursuant to which such Loan Party is to purchase a certain quantity of gas from the City of Westlake or such other municipalities and under which such Loan Party may be required to pledge certain
cash collateral to secure its payment obligations.  
 “General Intangibles” means all of the Loan
Parties’ now owned or hereafter acquired general intangibles, choses in action, and causes of action and all other intangible personal property of the Loan Parties of every kind and nature (other than Accounts), including, without limitation,
all contract rights, payment intangibles, Proprietary Rights, corporate or other business records, inventions, designs, blueprints, plans, specifications, patents, patent applications, trademarks, service marks, trade names, trade secrets, goodwill,
copyrights, computer software, customer lists, registrations, licenses, franchises, tax refund claims, any funds which may become due to any Loan Party in connection with the termination of any Plan or other employee benefit plan or any rights
thereto and any other amounts payable to any Loan Party from any Plan or other employee benefit plan, rights and claims against carriers and shippers, rights to indemnification, business interruption insurance and proceeds thereof, property,
casualty, or any similar type of insurance and any proceeds thereof, proceeds of insurance covering the lives of key employees on which any Loan Party is beneficiary, rights to receive dividends, distributions, cash, Instruments, and other property
in respect of or in exchange for any letter of credit, guarantee, claim, security interest, or other security held by or granted to any Loan Party. 

“Governmental Authority” means any federal, state, local, foreign or other agency, authority, body, commission, court,
instrumentality, political subdivision, central bank, or other entity or officer exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions for any governmental, judicial, investigative, regulatory or
self-regulatory authority (including the Financial Conduct Authority, the Prudential Regulation Authority and any supra-national bodies such as the European Union or European Central Bank). 

“Guarantor” means Westlake and each Restricted Subsidiary of Westlake that has executed an Obligation Guaranty on or
before the date hereof and each Material Domestic Subsidiary of Westlake which undertakes to be liable for all or any part of the Obligations by execution of an Obligations Guaranty or otherwise, until any such party may be released in accordance
with the term hereof. 
 “Guaranty” means, with respect to any Person, all obligations of such Person
which in any manner directly or indirectly guarantee or assure, or in effect guarantee or assure, the payment or performance of any indebtedness, dividend or other obligations of any other Person (the “guaranteed
obligations”), or assure or in effect assure the holder of the guaranteed obligations against loss in respect thereof, including any such obligations incurred through an agreement, contingent or otherwise:
(a) to purchase the guaranteed obligations or any property constituting security therefor; (b) to advance or supply funds for the purchase or payment of the guaranteed obligations or to maintain a working capital or other balance sheet
condition; or (c) to lease property or to purchase any debt or equity securities or other property or services. 

“Hazardous Materials” means any material that poses a threat to, or is regulated to protect, human health, safety,
public welfare or the environment, including without limitation, “hazardous substance,” “pollutant or contaminant,” “petroleum” and “natural gas liquids,” as those terms are defined or used in
Section 101 of the Comprehensive Environmental Response, Compensation, and Liability Act, polychlorinated biphenyls, lead, asbestos, urea formaldehyde, radioactive materials, putrescible materials, infectious materials, and toxic microorganisms
(including mold). 

 “Hedge Agreement” means any and all transactions, agreements, or
documents now existing or hereafter entered into, which provides for an interest rate, credit, commodity, or equity swap, cap, floor, collar, forward foreign exchange transaction, currency swap, cross currency rate swap, currency option, or any
combination of, or option with respect to, these or similar transactions, for the purpose of hedging any Loan Party’s exposure to fluctuations in interest or exchange rates, loan, credit exchange, security or currency valuations or commodity
prices; provided that such Hedge Agreement shall be incurred in the ordinary course of business and consistent with prior business practices of the Loan Parties and not for speculative purposes. 

“Indemnified Taxes” means (a) Taxes, other than Excluded Taxes, imposed on or relating to any payment of an
Obligation; and (b) to the extent not otherwise described in clause (a), Other Taxes. 

“Instruments” means all instruments as such term is defined in the UCC, now owned or hereafter acquired by any Loan
Party. 
 “Intangible Assets” means assets that are considered to be intangible assets under GAAP,
including customer lists, goodwill, computer software, copyrights, trade names, trade marks, patents, unamortized deferred charges, unamortized debt discount, and capitalized research and development costs.  

“Interest Period” means, as to any LIBOR Rate Loan, the period commencing on the Funding Date of such Loan or on the
Continuation/Conversion Date on which the Loan is converted into or continued as a LIBOR Rate Loan, and ending on the date one, two, or three months thereafter as selected by the Borrowers in any Notice of Borrowing, in the form attached hereto as
Exhibit D, or Notice of Continuation/Conversion, in the form attached hereto as Exhibit E, provided that: 

(a) if any Interest Period would otherwise end on a day that is not a Business Day, that Interest Period shall be extended to
the following Business Day unless the result of such extension would be to carry such Interest Period into another calendar month, in which event such Interest Period shall end on the preceding Business Day; 

(b) any Interest Period pertaining to a LIBOR Rate Loan that begins on the last Business Day of a calendar month (or on a day
for which there is no numerically corresponding day in the calendar month at the end of such Interest Period) shall end on the last Business Day of the calendar month at the end of such Interest Period; and 

(c) no Interest Period shall extend beyond the Stated Termination Date. 

“Interest Rate” means each or any of the interest rates, including the Default Rate, set forth in
Section 2.1. 
 “Inventory” means all of any Loan Party’s now owned and
hereafter acquired inventory, goods and merchandise, wherever located, to be furnished under any contract of service or held for sale or lease, all returned goods, raw materials, work-in-process, finished goods (including embedded software), other
materials and supplies of any kind, nature, or description which are used or consumed in any Loan Party’s business or used in connection with the packing, shipping, advertising, selling or finishing of such goods, merchandise, and all documents
of title or other Documents representing them. 

 “Investment Grade” means a rating of (a) Baa3 or
better by Moody’s or BBB- or better by S&P and (b) the equivalent investment grade credit rating from another “nationally recognized statistical rating organization” within the meaning of Rule 15c3-1(c)(2)(vi)(F) under the
Exchange Act (including, for the avoidance of doubt, S&P if the agency referred to in clause (i) is Moody’s, or vice versa). 

“IRBs” means the $10,889,000 original principal amount Calcasieu Parish Public Trust Authority Waste Disposal Revenue
Bonds issued pursuant to the Indenture of Trust dated December 1, 1997, between Calcasieu Parish Public Trust Authority, as issuer, and JPMorgan Chase Bank (formerly known as The Chase Manhattan Bank), as trustee. 

“IRS” means the Internal Revenue Service and any Governmental Authority succeeding to any of its principal functions
under the Code. 
 “Joint Venture” means any joint venture between any Loan Party or any JV Subsidiary
and any other Person, if such joint venture is owned 50% or less by the Loan Parties or any JV Subsidiary. 
 “JV
Subsidiary” means each Subsidiary of a Loan Party (a) that, at any time, directly holds a Capital Stock in any Joint Venture and (b) that has no other material assets. 

“Latest Projections” means: (a) on the Closing Date and thereafter until the Agent receives new projections
pursuant to Section 5.2(f), the most recent projections of the Loan Parties’ financial condition, results of operations, and cash flows delivered to the Agent; and (b) thereafter, the projections most recently received
by the Agent pursuant to Section 5.2(f). 
 “Lending Office” means the office
designated as such by the applicable Lender at the time it becomes party to this Agreement or thereafter by notice to the Agent and Westlake. 

“Lender” and “Lenders” have the meanings specified in the introductory paragraph hereof and
shall include the Agent to the extent of any Agent Advance outstanding and the Bank to the extent of any Non-Ratable Loan outstanding; provided that no such Agent Advance or Non-Ratable Loan shall be taken into
account in determining any Lender’s Pro Rata Share. 
 “Letter of Credit” has the meaning
specified in Section 1.3(a). 
 “Letter of Credit Documents” means all documents,
instruments and agreements (including any request or applications for a Letter of Credit) delivered by the Borrowers or any other Person to a Letter of Credit Issuer or the Agent in connection with any Letter of Credit. 

“Letter of Credit Fee” has the meaning specified in Section 2.6. 

“Letter of Credit Indemnitees” means the Letter of Credit Issuers and their officers, directors, employees, trustees,
Affiliates, agents and attorneys. 
 “Letter of Credit Issuer” means the Bank, any affiliate of the
Bank, or any Additional Letter of Credit Issuer.  
 “Letter of Credit Obligations” means the sum
(without duplication) of (a) all amounts owing by the Borrowers for any drawings under Letters of Credit; (b) the stated amount of all outstanding Letters of Credit; and (c) all fees and other amounts owing with respect to Letters of
Credit. 

 “Letter-of-Credit Rights” means “letter-of-credit
rights” as such term is defined in the UCC, now owned or hereafter acquired by any Loan Party, including rights to payment or performance under a letter of credit, whether or not any Loan Party, as beneficiary, has demanded or
is entitled to demand payment or performance. 
 “Letter of Credit Subfacility” means
$400,000,000. 
 “LIBOR Interest Payment Date” means, with respect to a LIBOR Rate Loan, the
Termination Date and the last day of each Interest Period applicable to such Loan or, with respect to each Interest Period of greater than three months in duration, the last day of the third month of such Interest Period and the last day of such
Interest Period. 
 “LIBOR Rate” means, for any Interest Period, with respect to LIBOR Rate Loans, the
rate of interest per annum determined pursuant to the following formula: 
  

					
	 LIBOR Rate =
	 		  	                         Offshore Base Rate
		 		  	                        1.00 - Eurodollar Reserve 
Percentage

 “LIBOR Rate Loan” means a Revolving Loan during any period in which it bears interest
based on the LIBOR Rate. 
 “Lien” means: (a) any interest in property securing an obligation
owed to, or a claim by, a Person other than the owner of the property, whether such interest is based on the common law, statute, or contract, and including a security interest, charge, claim, or lien arising from a mortgage, deed of trust,
encumbrance, pledge, hypothecation, assignment, deposit arrangement, agreement, security agreement, conditional sale or trust receipt, or a lease, consignment, or bailment for security purposes; and (b) to the extent not included under
clause (a), any reservation, exception, encroachment, easement, right-of-way, covenant, condition, restriction, lease, or other title exception or encumbrance affecting property. 

“Limited Recourse Stock Pledge” means the pledge of Capital Stock in any Joint Venture or any Unrestricted Subsidiary
to secure Non-Recourse Debt of such Joint Venture or Unrestricted Subsidiary, which pledge is made by a Restricted Subsidiary of Westlake, the activities of which are limited to making and managing investments, and owning Capital Stock in such Joint
Venture or Unrestricted Subsidiary, but only for so long as its activities are so limited. 
 “Loan
Account” means the loan account of the Borrowers, which account shall be maintained by the Agent. 

“Loan Documents” means this Agreement, the Notes, the Collateral Documents, the Letters of Credit, any Letter of
Credit Document, and any other agreements, instruments, and documents heretofore, now or hereafter evidencing, securing, guaranteeing or otherwise relating to the Obligations, the Collateral, or any other aspect of the transactions contemplated by
this Agreement; provided that for purposes of the definition of “Material Adverse Effect” and Articles IV through XII, “Loan Documents”
shall not include Bank Products.  
 “Loan Parties” means, on any date of determination, each Borrower
and all Guarantors, and “Loan Party” means any Borrower or any Guarantor. 

“Loans” means, collectively, all loans and advances provided for in Article 1, and shall include
Revolving Loans.  

 “Local Accounts” has the meaning specified in
Section 8.1(k). 
 “Margin Stock” means “margin
stock” as such term is defined in Regulation T, U, or X of the Federal Reserve Board. 

“Material Adverse Effect” means (a) a material adverse change in, or a material adverse effect upon, the assets,
liabilities, business, operations, properties, or condition (financial or otherwise) of Westlake, the Loan Parties and their Restricted Subsidiaries taken as a whole or the Collateral; (b) a material impairment of the ability of any Loan Party
to perform under any Loan Document to which it is a party; or (c) a material adverse effect upon the legality, validity, binding effect, or enforceability against any Loan Party of any Loan Document to which it is a party. 

“Material Agreement” means any agreement or arrangement to which a Loan Party is a party or is bound as of the date
thereof (other than the Loan Documents), without duplication, that is deemed to be a material contract under any securities law applicable to such Loan Party, including the Securities Act of 1933.  

“Material Domestic Subsidiary” means each Restricted Subsidiary that is both a Material Subsidiary and a
Domestic Subsidiary, other than an Excluded Subsidiary. 
 “Material Subsidiary” means any Restricted Subsidiary
(a) the fair market value of whose Tangible Assets is at least $200,000,000 or (b) whose sales in the immediately preceding twelve (12) month period are at least $50,000,000 (in each case, on a non-consolidated basis). 

“Maximum Rate” has the same meaning specified in Section 2.3. 

“Maximum Revolver Amount” means the aggregate amount of the Commitments of the Lenders, as such amount may be
increased or reduced from time to time pursuant to the terms of this Agreement. 
 “MLP Operating
Agreements” means the Omnibus Agreement, Services and Secondment Agreement, Ethylene Sales Agreement, Feedstock Agreement, Site Lease Agreements and such other agreements as contemplated and set forth in the Registration Statement and
amendments to such Registration Statement as set forth in Schedule 13.25, each to be entered into among Westlake Chemical OpCo LP, Westlake Chemical OpCo GP LLC, Westlake Chemical Partners LP and Westlake and certain of its Restricted
Subsidiaries, as amended from time to time, in substance reasonably acceptable to the Agent. 
 “Moody’s” means
Moody’s Investors Services, Inc. and any successor thereto. 
 “Multi-employer Plan” means a
“multi-employer plan” as defined in Section 4001(a)(3) of ERISA which is or was at any time during the current year or the immediately preceding five (5) years contributed to by any Loan Party
or any ERISA Affiliate. 
 “Net Amount of Eligible Accounts” means, at any time, the gross amount of
Eligible Accounts less sales, excise, or similar taxes, and less returns, discounts, claims, credits, allowances, accrued rebates, offsets, deductions, counterclaims, disputes, and other defenses of any nature at any time issued, owing, granted,
outstanding, available, or claimed. 
 “Net Orderly Liquidation Value” shall mean (a) the
“net orderly liquidation value” determined by a valuation company acceptable to the Agent after performance of an Inventory valuation  

 
to be done at the Agent’s request and the Borrowers’ expense, less the amount estimated by such valuation company for marshalling, reconditioning, carrying, and sales expenses designed
to maximize the resale value of such Inventory and assuming that the time required to dispose of such Inventory is three (3) months; or (b) if no such Inventory valuation has been requested by the Agent, the value customarily attributed to
Inventory in the appraisal industry for Inventory of similar quality and quantity, and similarly dispersed (under similar and relevant circumstances under standard asset-based lending procedures), at the time of the valuation, less the amount
customarily estimated in the appraisal industry at the time of any determination for marshalling, recondition, carrying, and sales expenses designed to maximize the resale value of such Inventory and assuming that the time required to dispose of
such Inventory is three (3) months. 
 “Non-Continuing Lenders” has the meaning specified in
Section 13.22. 
 “Non-Ratable Loan” and “Non-Ratable
Loans” have the meanings specified in Section 1.2(h). 
 “Non-Recourse
Debt” means Debt: 
 (a) as to which no Loan Party (x) provides credit support of any kind
(including any undertaking, agreement or instrument that would constitute Debt), (y) is directly or indirectly liable as a guarantor or otherwise, or (z) constitutes the lender (excluding customary unsecured completion guarantees); 

(b) no default with respect to which (including any rights that the holders of the Debt may have to take enforcement action
against an Unrestricted Subsidiary) would permit upon notice, lapse of time or both any holder of any other Debt of a Loan Party to declare a default on such other Debt or cause the payment of the Debt to be accelerated or payable prior to its
stated maturity; and 
 (c) as to which the Lenders have been notified in writing that they will not have any recourse to the
stock or assets of a Loan Party, other than the Capital Stock of a Joint Venture or of an Unrestricted Subsidiary pledged by a Loan Party as a Limited Recourse Stock Pledge. 

“Note and Notes” have the same meaning specified in Section 1.2(a)(ii). 

“Notice of Borrowing” has the meaning specified in Section 1.2(b). 

“Notice of Continuation/Conversion” has the meaning specified in Section 2.2(b). 

“Obligation Guaranty” means the (a) the Second Amended and Restated Obligation Guaranty in substantially the form
and upon the terms of Exhibit C, executed and delivered by any Person pursuant to the requirements of the Loan Documents; and (b) any amendments, modifications, supplements, restatements, ratifications, or reaffirmations of
any Guaranty made in accordance with the Loan Documents. 
 “Obligations” means all present and future
loans, advances, liabilities, obligations, covenants, duties, and debts owing by any Loan Party to the Agent and/or any Lender, arising under or pursuant to this Agreement or any of the other Loan Documents, whether or not evidenced by any note, or
other instrument or document, whether arising from an extension of credit, opening of a letter of credit, acceptance, loan, guaranty, indemnification or otherwise, whether direct or indirect, absolute or contingent, due or to become due, primary or
secondary, or joint or several, as principal or guarantor, and  

 
including all principal, interest, charges, expenses, fees, attorneys’ fees, filing fees, and any other sums chargeable to any Loan Party hereunder or under any of the other Loan Documents.
“Obligations” includes, without limitation, (a) the principal of, and interest on, all Revolving Loans, (b) all Letter of Credit Obligations, and (c) all debts, liabilities and obligations now or hereafter
arising from or in connection with Bank Products; provided that Obligations of a Loan Party shall not include its Excluded Swap Obligations. 

“OFAC” means Office of Foreign Assets Control of the U.S. Treasury Department. 

“Offshore Base Rate” means for any Interest Period with respect to a LIBOR Rate Loan, the rate per annum equal to the
London Interbank Offered Rate (“LIBOR”), or a comparable or successor rate which rate is approved by the Agent, as published on the applicable Bloomberg screen page (or another commercially available source providing
quotations of LIBOR as reasonably designated by the Agent) (in such case, the “LIBOR Rate”) at or about 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period, for deposits in the
relevant currency (for delivery on the first day of such Interest Period) with a term equivalent to such Interest Period; provided that to the extent a comparable or successor rate is approved by the Agent in
connection herewith, the approved rate shall be applied in a manner consistent with market practice; provided, further that to the extent such market practice is not
administratively feasible for the Agent, such approved rate shall be applied in a manner as otherwise reasonably determined by the Agent. 

“Other Connection Taxes” means Taxes imposed on a Recipient due to a present or former connection between it and the
taxing jurisdiction (other than connections arising from the Recipient having executed, delivered, become party to, performed obligations or received payments under, received or perfected a Lien or engaged in any other transaction pursuant to,
enforced, or sold or assigned an interest in, any Loan or Loan Document). 
 “Other Taxes” means all
present or future stamp, court, documentary, intangible, recording, filing or similar Taxes that arise from any payment made under, from the execution, delivery, performance, enforcement or registration of, from the receipt or perfection of a Lien
under, or otherwise with respect to, any Loan Document, except Other Connection Taxes imposed with respect to an assignment (other than an assignment made pursuant to Section 4.10). 

“Pari Passu Bank Product Obligations” means all debts, liabilities and obligations of the Loan Parties now or
hereafter arising from or in connection with the Hedge Agreements constituting Bank Products and reported to the Agent pursuant to Section 7.23; provided that the Pari Passu Bank Product
Obligation with respect to any Hedge Agreement shall be equal to the Bank Product Reserves established for such Hedge Agreement in accordance with Section 7.23. 

“Participant” means any Person who shall have been granted the right by any Lender to participate in the financing
provided by such Lender under this Agreement, and who shall have entered into a participation agreement in form and substance satisfactory to such Lender. 

“Patent and Trademark Agreements” means any Patent Security Agreement and any Trademark Security Agreement, executed
and delivered by any Loan Party to the Agent to evidence and perfect the Agent’s security interest in each such Loan Party’s present and future patents, trademarks, and related licenses and rights, for the benefit of the Agent and the
Lenders, as amended, restated, amended and restated, or otherwise modified from time to time. 
 “Payment
Account” means each bank account established pursuant to the Security Agreement, to which the proceeds of Accounts and other Collateral are deposited or credited, and which is maintained in the name of the Agent or the Borrowers, as the
Agent may determine, on terms acceptable to the Agent. 

 “PCBs” means polychlorinated biphenyls. 

“PBGC” means the Pension Benefit Guaranty Corporation or any Governmental Authority succeeding to the functions
thereof. 
 “Pending Revolving Loans” means, at any time, the aggregate principal amount of all
Revolving Loans requested in any Notice of Borrowing received by the Agent which have not yet been advanced. 

“Pension Plan” means a pension plan (as defined in Section 3(2) of ERISA) subject to Title IV of ERISA which any
Loan Party or any ERISA Affiliate sponsors, maintains, or to which it makes, is making, or is obligated to make contributions, or in the case of a Multi-employer Plan has made contributions at any time during the immediately preceding five
(5) plan years. 
 “Permitted Business” means the petrochemical, chemicals, and vinyls or plastic
fabrications business and any other businesses related, incidental, complementary or ancillary thereto. 

“Permitted Consideration” means (a) cash, (b) Cash Equivalents, (c) publicly traded equity securities
of a Person with a market capitalization (not held by Affiliates of such Person) of at least $500,000,000, or (d) a controlling interest in, or long-term assets used or useful in, a business engaged in a Permitted Business. For purposes of this
definition, each of the following will also be deemed to be cash: 
 (i) any liabilities, as shown on its most recent balance
sheet, of any Loan Party or its Restricted Subsidiaries (other than contingent liabilities and liabilities that are by their terms subordinated to the Obligations) that are assumed by the transferee of any such assets pursuant to a customary
novation agreement that releases such Loan Party or such Restricted Subsidiaries from further liability; 
 (ii) any
securities, notes or other obligations received by a Loan Party or its Restricted Subsidiaries from such transferee that are promptly, subject to ordinary settlement periods, converted or monetized by such Loan Party or such Restricted Subsidiaries
into cash, to the extent of the cash received in that conversion or monetization; 
 (iii) any Capital Stock or assets of any
Person or division conducting a Permitted Business, if, in the case of any such acquisition of Capital Stock and after giving effect thereto, such Person will be a Restricted Subsidiary of a Loan Party; and 

(iv) assets that are not classified as current assets under GAAP and that are used or useful in a Permitted Business. 

“Permitted Group” means any group of investors that is deemed to be a
“person” (as that term is used in Section 13(d)(3) of the Exchange Act) at any time prior to Westlake’s initial public offering of common stock, provided that
no single Person (other than the Principals and their Related Parties) Beneficially Owns (together with its Affiliates) more of the Voting Stock of the Borrower that is Beneficially Owned by such group of investors than is then collectively
Beneficially Owned by the Principals and their Related Parties in the aggregate. 

 “Permitted Liens” means: 

(a) Liens for taxes or statutory Liens for taxes, assessments and other governmental charges, provided that (i) the
payment of which is not yet due and payable, or (ii) the payment of such taxes or governmental charges which are due and payable is being contested in good faith and by appropriate proceedings diligently pursued and as to which adequate
financial reserves have been established on the applicable Loan Party’s books and records; 
 (b) the Agent’s
Liens; 
 (c) Liens consisting of deposits made in the ordinary course of business in connection with, or to secure payment
of, obligations under workers’ compensation, unemployment insurance, social security, and other similar laws, or to secure the performance of bids, tenders, or contracts (other than for the repayment of Debt), or to secure indemnity,
performance or other similar bonds for the performance of bids, tenders or contracts (other than for the repayment of Debt), or to secure statutory obligations (other than liens arising under ERISA or Environmental Liens) or surety or appeal bonds,
or to secure indemnity, performance or other similar bonds; 
 (d) Liens securing the claims or demands of materialmen,
mechanics, carriers, rail carriers, warehousemen, landlords, and other like Persons arising in the ordinary course of business, provided that if any such Lien arises from the nonpayment of such claims or demands when due, such claims or
demands do not exceed $2,500,000 if they create Liens on the Collateral, or $10,000,000 if they do not create Liens on the Collateral, each in the aggregate, unless any such claims or demands are being contested in good faith and by appropriate
proceedings diligently pursued promptly after knowledge thereof and as to which adequate financial reserves have been established on the applicable Loan Party’s books and records; 

(e) Liens constituting encumbrances in the nature of reservations, exceptions, encroachments, easements, rights of way,
covenants running with the land, and other similar title exceptions or encumbrances affecting any Real Estate; provided that they do not in the aggregate materially detract from the value of the Real Estate or materially interfere with its
use in the ordinary conduct of the applicable Loan Party’s business; 
 (f) Liens arising from judgments and attachments
in connection with court proceedings, provided that the attachment or enforcement of such Liens would not result in an Event of Default hereunder and such Liens are being contested in good faith by appropriate proceedings, adequate reserves
have been set aside and no material property is subject to a material risk of loss or forfeiture and the claims in respect of such Liens are fully covered by insurance (subject to ordinary and customary deductibles) and a stay of execution pending
appeal or proceeding for review is in effect; 
 (g) the interest of a lessor or a licensor under an operating lease or
license under which a Loan Party is lessee, sublessee or licensee, including protective financing statement filings; 
 (h)
Liens securing Debt existing on the Closing Date to the extent such Liens are described on Schedule 7.17; 

(i) Liens evidencing consignments of Inventory; 

 (j) Liens securing Debt permitted pursuant to Section 7.13(h)
so long as such Liens attached only to unearned premiums for such financed insurance; 
 (k) Liens securing (A) Hedge
Agreements or (B) the Loan Parties’ obligations under the Gas Supply/Purchase Agreement, to the extent required thereunder; provided that if such Hedge Agreements do not constitute Bank Products, the aggregate amount secured by all
Liens under such Hedge Agreements and the Gas Supply/Purchase Agreement does not exceed $20,000,000 and the assets subject to such Liens attach solely to cash held in a specified cash collateral account or margin accounts pledged to secure such
obligations, so long as at the time that such Liens are incurred (i) the Availability is not less than $75,000,000, and (ii) Fixed Charge Coverage Ratio is at least 1:0:1.0, provided further that the amount of cash so pledged shall
not be increased if at any time (i) the Availability is less than $75,000,000, or (ii) Fixed Charge Coverage Ratio is less than 1:0:1.0; 

(l) Liens on assets not constituting Collateral securing Debt permitted under Section 7.13(m); 

(m) (i) Liens on cash and Cash Equivalents used to make a defeasance of Debt, the payment or prepayment of which Debt is
permitted by this Agreement, and (ii) Liens on securities, brokerage and commodity accounts and all cash, Cash Equivalents and other assets therein; 

(n) customary Liens for the fees, costs and expenses of trustees and escrow agents pursuant to any indenture, escrow agreement
or similar agreement establishing a trust or escrow agreement; 
 (o) Liens on property of a Person existing at the time such
Person becomes a Restricted Subsidiary or is merged with or into or consolidated with any Loan Party; provided that (i) such property does not constitute Collateral and (ii) such Liens were in existence prior to the contemplation of
such acquisition, merger or consolidation and do not extend to any assets other than those of the Person merged into or consolidated with any Loan Party or that becomes a Restricted Subsidiary; 

(p) So long as such transactions are otherwise permitted under this Agreement, (i) Liens upon or in property acquired
(including acquisitions through merger or consolidation) or constructed or improved by any such Loan Party including general tangibles, proceeds and improvements, accessories and upgrades thereto, and created contemporaneously with, or within twelve
(12) months after, such acquisition or the completion of construction or improvement to secure or provide for the payment of all or a portion of the purchase price of such property or the cost of construction or improvement thereof (including
any Indebtedness incurred to finance such acquisition, construction or improvement), as the case may be, (ii) Liens on property (including any unimproved portion of partially improved property) of such Loan Party created within twelve
(12) months of completion of construction of a new plan or plans on such property to secure all or part of the cost of such construction (including any Indebtedness incurred to finance such construction) if, in the opinion of such Loan Party,
such property or such portion thereof was prior to such construction substantially unimproved for the use intended by such Loan Party; and (iii) in the case of Capital Leases, Liens on the assets subject to such Capitalized Leases and proceeds
(including, without limitation, proceeds from associated contracts and insurances) of, and improvements, accessories and upgrades to, the property leased pursuant thereto; provided, however, in each of the foregoing clauses
(i), (ii), and (iii), no such Lien shall extend to or cover (A) any property other than the property being acquired, constructed, improved or leased (including any unimproved portion of a partially improved
property) including general intangibles, proceeds and improvements, accessories and upgrades thereto or (B) any Collateral; 

 (q) Limited Recourse Stock Pledge; and 

(r) Liens on property existing at the time of acquisition of such property and not constituting Collateral, provided
that such Liens were in existence prior to, and not incurred in contemplation of, such acquisition; and 
 (s) Liens on
assets not constituting Collateral securing Debt permitted by Section 7.13(n). 
 “Person” means
any individual, sole proprietorship, partnership, limited liability company, joint venture, trust, unincorporated organization, association, corporation, Governmental Authority, or any other entity. 

“Plan” means an employee benefit plan (as defined in Section 3(3) of ERISA) established by a Loan Party or with
respect to which any Loan Party makes, is making, or is obligated to make contributions and includes any Pension Plan. 

“Platform” has the meaning specified in Section 13.8. 

“Prime Rate” means the rate of interest announced by the Bank from time to time as its prime rate. Such rate is set by
the Bank on the basis of various factors, including its costs and desired return, general economic conditions and other factors, and is used as a reference point for pricing some loans, which may be priced at, above or below such rate. Any change in
such rate announced by the Bank shall take effect at the opening of business on the day specified in the public announcement of such change. 

“Principals” means the descendents of T.T. Chao, including by adoption, and the spouses of any such individuals.

 “Project Finance Subsidiary” means a Subsidiary that is a special-purpose entity created to
(a) construct, acquire, operate and/or own any asset or project that will be or is financed solely with Non-Recourse Debt for such asset or project and related equity investments in, loans to, or capital contributions in, such Subsidiary that
are not prohibited hereby and/or (b) own an interest in any such asset or project. 
 “Proprietary
Rights” means all of any Loan Party’s now owned and hereafter arising or acquired: licenses, franchises, permits, patents, patent rights, copyrights, works which are the subject matter of copyrights, trademarks, service marks,
trade names, trade styles, patent, trademark, and service mark applications, and all licenses and rights related to any of the foregoing, including those federally registered or otherwise material patents, trademarks, service marks, trade names, and
copyrights set forth on Schedule 6.9 hereto, and all other rights under any of the foregoing, all extensions, renewals, reissues, divisions, continuations, and continuations-in-part of any of the foregoing, and all rights to sue
for past, present and future infringement of any of the foregoing.  
 “Pro Forma Fixed Charge Coverage
Ratio” means, with respect to any proposed Acquisition, calculation of the Fixed Charge Coverage Ratio with respect to the immediately preceding twelve (12) months, calculated as though the proposed Acquisition had occurred at the
beginning of such period, and calculation of the Fixed Charge Coverage Ratio on a pro forma basis, based on the Loan  

 
Parties’ best estimates as of the date of calculation, of the ratio of EBITDA during the succeeding twelve (12) months to the projected Fixed Charges during such succeeding twelve
(12) month period, after giving effect to the proposed Acquisition. 
 “Pro Rata Share” means, with respect to
a Lender, a fraction (expressed as a percentage), the numerator of which is the amount of such Lender’s Commitment and the denominator of which is the sum of the amounts of all of the Lenders’ Commitments, or if no Commitments are
outstanding, a fraction (expressed as a percentage), the numerator of which is the amount of Obligations owed to such Lender (excluding any Obligations with respect to Bank Products) and the denominator of which is the aggregate amount of the
Obligations owed to the Lenders (excluding any Obligations with respect to Bank Products), in each case giving effect to a Lender’s participation in Non-Ratable Loans and Agent Advances. 

“Qualified ECP” means a Loan Party with total assets exceeding $10,000,000, or that constitutes an “eligible
contract participant” under the Commodity Exchange Act and can cause another Person to qualify as an “eligible contract participant” under Section 1a(18)(A)(v)(II) of such act. 

“Real Estate” means all of any Loan Party’s now or hereafter owned or leased estates in real property, including,
without limitation, all fees, leaseholds and future interests, together with all of any Loan Party’s now or hereafter owned or leased interests in the improvements thereon, the fixtures attached thereto, and the easements appurtenant
thereto. 
 “Recipient” means the Agent, each Letter of Credit Issuer, any Lender or any other
recipient of a payment to be made by a Loan Party under a Loan Document or on account of an Obligation. 

“Reimbursement Date” has the meaning set forth in Section 1.3(f).  

“Related General Intangibles” means all of each Loan Party’s intangible personal property used or useful for, in
connection with, or in any respect related to, any Accounts, Inventory, Instruments, Chattel Paper, Documents, or Deposit Accounts, which Related General Intangibles shall include all money, General Intangibles (including payment intangibles and
software), and Proprietary Rights, together with all additions, amendments, and modifications thereto, extensions, renewals, enlargements, and proceeds thereof, substitutions therefor, and income and profits therefrom. To the extent obtained in
connection with or otherwise related to Accounts, Inventory, Instruments, Chattel Paper, Documents, or Deposit Accounts, the following are included, without limitation, in the definition of “Related General Intangibles”: loan
commitments, financing arrangements, bonds, leases, permits, sales contracts, insurance policies, and the proceeds therefrom, books and records, funds, bank deposits; all Proprietary Rights used in connection therewith; any award, remuneration,
settlement, or compensation heretofore made or hereafter to be made by any Governmental Authority to any Loan Party, all deposits, funds, accounts, contract rights, or documents, arising from or by virtue of any transactions; all permits, licenses,
franchises, certificates, and other rights and privileges; all proceeds arising from or by virtue of the sale, lease, or other disposal of all or any part of the foregoing; and all proceeds (including premium refunds) payable or to be payable under
each policy of insurance relating to the foregoing. 
 “Related Party” means (a) any controlling
stockholder, 80% (or more) owned Subsidiary, or immediate family member (in the case of an individual) of any Principal or (b) any Person, the beneficiaries, stockholders, partners, owners, or Persons beneficially holding a 50% or more
controlling interest of which consist of any one or more Principals and/or such other Persons referred to in the immediately preceding clause (a). 

 “Release” means a release, spill, emission, leaking, pumping, injection,
deposit, disposal, discharge, dispersal, leaching, or migration of any Hazardous Materials into the environment, including the movement of Hazardous Materials through or in the air, soil, surface water, groundwater or Real Estate or other
property. 
 “Reportable Event” means, any of the events set forth in Section 4043(b) of ERISA or
the regulations thereunder, other than any such event for which the 30-day notice requirement under ERISA has been waived in regulations issued by the PBGC. 

“Required Lenders” means at any time Lenders whose Pro Rata Shares aggregate more than 50%;
provided, however, that the Commitments and Loans of any Defaulting Lender shall be excluded from such calculation. 

“Requirement of Law” means, as to any Person, any law (statutory or common), treaty, rule or regulation or
determination of an arbitrator or of a Governmental Authority, in each case applicable to or binding upon the Person or any of its property or to which the Person or any of its property is subject. 

“Reserves” means reserves that limit the availability of credit hereunder, consisting of reserves against
Availability, Eligible Accounts, or Eligible Inventory, established by the Agent from time to time in the Agent’s reasonable credit judgment. Without limiting the generality of the foregoing, the following reserves shall be deemed to be a
reasonable exercise of the Agent’s credit judgment: (a) Bank Product Reserves, (b) a reserve for accrued, unpaid interest on the Obligations, (c) reserves for rent at leased locations subject to statutory or contractual landlord
liens, (d) Inventory shrinkage, (e) Environmental Compliance Reserves, (f) customs charges, (g) dilution, (h) carriers’, processors’, warehousemen’s, or bailees’ charges, (i) reserves for nonpayment
of taxes, assessments, fees or other governmental charges and materialmen, and mechanics claims, (j) from the date of declaration of any dividend until the date on which such dividend is actually made, Reserves equal to the amount of any
dividend declared under Section 7.10, and (k) reserves for the payment of the 6 5⁄8% Senior Notes due 2016 if such notes have not been
refinanced, defeased or redeemed 90 days prior to the maturity date thereof.  
 “Responsible Officer”
means the chief executive officer, president, chief financial officer, treasurer, assistant treasurer, or controller of a Loan Party. Any document delivered hereunder that is signed by a Responsible Officer of a Loan Party shall be conclusively
presumed to have been authorized by all necessary corporate, limited liability company, and/or other action on the part of such Loan Party and such Responsible Officer shall be conclusively presumed to have acted on behalf of such Loan Party.

 “Restricted Investment” means, as to any Person, any acquisition of property by such Person in exchange
for cash or other property, whether in the form of an acquisition of stock, debt, or other indebtedness or obligation, or the purchase or acquisition of any other property, or an investment, loan, advance, extension of credit, capital contribution,
or subscription, except the following:  
 (a) acquisitions of assets to be used in the business of such Person
so long as (i) the acquisition costs thereof constitute Capital Expenditures permitted hereunder, and (ii) such acquisition is otherwise permitted under this Agreement; 

(b) acquisitions of Inventory in the ordinary course of business of such Person; 

 (c) acquisitions of current assets or assets acquired and used in the ordinary
course of business of such Person; 
 (d) direct obligations of the United States of America, or any agency thereof, or
obligations guaranteed by the United States of America, provided that such obligations mature within one year from the date of acquisition thereof; 

(e) acquisitions of certificates of deposit maturing within one year from the date of acquisition, bankers’ acceptances,
Eurodollar bank deposits, or overnight bank deposits, in each case issued by, created by, or with a bank or trust company organized under the laws of the United States of America or any state thereof or any other country having capital and surplus
aggregating at least $100,000,000 or the Dollar equivalent thereof; 
 (f) acquisitions of commercial paper given a rating of
“A2” or better by S&P or “P2” or better by Moody’s and maturing not more than 90 days from the date of creation thereof; 

(g) loans, advances, extensions of credit, capital contributions, and other investments (i) by any Loan Party to another
Loan Party, (ii) to any Loan Party by its Subsidiaries, or the direct or indirect owners of the Capital Stock in such Loan Party, or (iii) among Restricted Subsidiaries that are not Loan Parties; 

(h) investments existing on the Closing Date and identified on Schedule 7.10, including, without limitation,
loans, advances, extensions of credit to, and renewals or extensions thereof in accordance with Section 7.13, or capital contributions and other investments in any Restricted Subsidiary of Westlake; 

(i) Hedge Agreements; 

(j) Acquisitions made in accordance with Section 7.25; 

(k) sales of Inventory among the Loan Parties and Restricted Subsidiaries so long as the payment terms with respect to such
Inventory are in accordance with the customary business terms of such Persons and payment for such Inventory is made within thirty (30) days of delivery of such Inventory; 

(l) payments on any Debt permitted by Section 7.13(j); 

(m) transactions among Loan Parties so long as such transactions are otherwise permitted by the terms of
Section 7.15; 
 (n) investments in any Dollar denominated money market fund as defined by Rule 2a-7 under
the Investment Company Act of 1940; 
 (o) fully collateralized repurchase agreements with a term of not more than 30 days
for securities described in clause (f) above (without regard to the limitation on maturity contained in such clause) and entered into with a financial institution satisfying the criteria described in clause
(e) above; 
 (p) marketable direct obligations issued by any U.S. corporation, state of the United States of
America or any political subdivision of any such state or any public instrumentality thereof maturing within one year from the date of acquisition thereof and, at the time of acquisition, having a rating of no lower than single A from either S&P
or from Moody’s; 

 (q) auction rate preferred stocks, whether taxable, tax-exempt or DRD, issued by
a domestic or foreign corporation, a domestic or foreign bank, or closed-end municipal or taxable bond fund, that reset periodically through a modified “Dutch” auction, the frequency of auctions of which allows for classification as
short term investment, available for sale, at the time of acquisition, having a rating of no lower than triple A from either S&P or from Moody’s; 

(r) floating rate, variable rate and auction rate bonds, whether taxable or tax-exempt, issued by municipalities, states, state
agencies, political subdivision of states or any public instrumentality thereof, that reset periodically through a modified “Dutch” auction, the frequency of auctions of which allows for classification as short term investment,
available for sale thereof and, at the time of acquisition, having a rating of no lower than triple A from either S&P or from Moody’s; 

(s) investments in bond funds which are triple A rated by either Moody’s or S&P which maintain a dollar weighted
average portfolio maturity of not more than three years and a dollar weighted average duration not exceeding two years; 

(t) any acquisition of property, investment, loan, advance, extension of credit, capital contribution or subscription made with
the net cash proceeds of any issuance of, or in exchange for, the equity of Westlake (other than issuance or exchange to a Loan Party or any Subsidiary thereof) or any Unrestricted Subsidiary; 

(u) the receipt of noncash consideration in connection with any disposition permitted by Section 7.9; 

(v) investments represented by Hedging Agreements otherwise permitted under this Agreement, including the investments permitted
under clause (k) of the definition of “Permitted Liens”; 
 (w) loans or advances
to employees made in the ordinary course of business of Westlake or any Restricted Subsidiary in an aggregate principal amount not to exceed $1,000,000 at any one time outstanding; 

(x) Limited Recourse Stock Pledges; 

(y) any investment by Westlake or any Restricted Subsidiary in a Person, if as a result of such investment such Person becomes
a Loan Party (subject to compliance with Section 7.19); 
 (z) other loans, advances, extensions of
credit, capital contributions and other investments in any Person having an aggregate fair market value (measured on the date each such advance or investment was made and without giving effect to subsequent changes in value), when taken together
with all other loans, advances, extensions of credit, capital contributions and other investments made pursuant to this clause (z) that are at the time outstanding not to exceed, after giving effect to any dividends, return of
capital and subsequent reduction in the amount of any investments, the greater of (x) $50,000,000 and (y) 1.25% of the Tangible Assets (measured as of the date of the most recent financial statements delivered hereunder prior to the date
of such advance or investment), provided that the amount of loans, advances, extensions of credit, capital 

 
contributions and other investments made by Westlake and its Subsidiaries pursuant to this clause (z) shall be deemed reduced by upon designation of an Unrestricted Subsidiary,
the fair market value of such Subsidiary to the extent the investment in such Subsidiary was made pursuant to this clause (z), in an amount not to exceed the amount of such investments previously made pursuant to this clause
(z); provided, however, that if any investment or advance pursuant to this clause (z) is made in any Person that is not a Restricted Subsidiary of Westlake at the date of the making of such investment and
such Person becomes a Restricted Subsidiary of Westlake after such date, such investment shall thereafter be deemed to have been made pursuant to clause (g) above and shall cease to have been made pursuant to this clause
(z) for so long as such Person continues to be a Restricted Subsidiary; 
 (aa) any transaction described in
Section 7.9(viii); 
 (bb) so long as no Default or Event of Default has occurred and is continuing or would be
caused thereby loans, any investment constituting a transfer or disposition of any assets between or among Westlake and/or its Subsidiaries as a substantially concurrent interim transfer in connection with an investment otherwise permitted pursuant
to Section 7.10(c) or in connection with a disposition permitted by Section 7.9; and 

(cc) so long as no Default or Event of Default has occurred and is continuing or would be caused thereby loans, any investment,
loan, advance, extension of credit, capital contribution or subscription made with the net cash proceeds of any issuance of, or in exchange for, the Capital Stock of any Unrestricted Subsidiary (other than issuance or exchange to a Loan Party or any
Subsidiary thereof) or with the net cash proceeds of a substantially concurrent distribution or other transfer of cash from an Unrestricted Subsidiary to Westlake or any Restricted Subsidiary or from the issuance or sale of convertible or
exchangeable Disqualified Stock or convertible or exchangeable debt security of Westlake or any of its Restricted Subsidiaries that have been converted or exchanged for such equity interests (other than Capital Stock (or Disqualified Stock or debt
securities) sold to a Subsidiary of Westlake). 
 “Restricted Subsidiary” means, at any time of determination, all
Subsidiaries of Westlake, other than Unrestricted Subsidiaries of Westlake. 
 “Revolving Loans” has
the meaning specified in Section 1.2 and includes each Agent Advance and Non-Ratable Loan. 

“S&P” means Standard & Poor’s Ratings Services, a division of the McGraw-Hill Companies, Inc. and
any successor thereto. 
 “Sanction” means any international economic sanction administered or
enforced by the United States Government (including OFAC), the United Nations Security Council, the European Union, Her Majesty’s Treasury or other relevant sanctions authority. 

“Sanctioned Country” means, at any time, a country or territory which is itself the subject or target of any Sanctions
(at the time of this Agreement, Cuba, Iran, North Korea, Sudan and Syria). 
 “Sanctioned
Person” means, at any time, (a) any Person listed in any Sanctions-related list of designated Persons maintained by OFAC, the U.S. Department of State, or by the United Nations Security Council, the European Union or any European
Union member state, (b) any Person operating without authorization from the appropriate Governmental Authority, organized or resident in a Sanctioned Country or (c) any Person owned or controlled by any such Person or Persons described in
the foregoing clauses (a) or (b). 

 “SEC” means the Securities and Exchange Commission, or any Governmental
Authority succeeding to any of its principal functions. 
 “Security Agreement” means, collectively,
the Second Amended and Restated Security Agreements executed by the Loan Parties in favor of the Agent for the benefit of the Agent and the other Lenders, as amended, restated, amended and restated, or otherwise modified from time to time.

 “Settlement” and “Settlement Date” have the meanings specified in
Section 12.14(a)(i). 
 “Specified Obligor” means a Loan Party that is not then an
“eligible contract participant” under the Commodity Exchange Act (determined prior to giving effect to Section 3.5(c)). 

“Solvent” means, when used with respect to any Person, that at the time of determination: 

(a) the assets of such Person, at a fair valuation, are in excess of the total amount of its debts (including contingent
liabilities); and 
 (b) the present fair saleable value of its assets is greater than its probable liability on its existing
debts as such debts become absolute and matured; and 
 (c) it is then able and expects to be able to pay its debts
(including contingent debts and other commitments) as they mature; and 
 (d) it has capital sufficient to carry on its
business as conducted and as proposed to be conducted. 
 For purposes of determining whether a Person is Solvent, the amount of any contingent liability
shall be computed as the amount that, in light of all the facts and circumstances existing at such time, represents the amount that can reasonably be expected to become an actual or matured liability of such Person. 

Notwithstanding the foregoing, debt of any Loan Party owed to any other Loan Party shall not be included for purposes of calculating whether a Loan Party is
Solvent, so long as the Loan Parties, on a consolidated basis, were, are, and will be Solvent. 
 “Stated Termination
Date” means July 17, 2019. 
 “Subsidiary” of a Person means (a) any entity of
which more than fifty percent (50%) of the Voting Stock is owned or controlled directly or indirectly by the Person, or one or more of the Subsidiaries of such Person (or any combination thereof) or (b) any partnership (i) the sole
general partner or the managing general partner of which is such Person or a Subsidiary of such Person or (ii) the only general partners of which are that Person or one or more Subsidiaries of that Person (or any combination thereof). Unless
the context otherwise clearly requires, references herein to a “Subsidiary” refer to a Subsidiary of Westlake. 

“Supermajority Lenders” means at any date of determination Lenders whose Pro Rata Shares aggregate more than
662/3%, provided, however, that the Commitments and Loans of any Defaulting Lender shall be excluded from such calculation. 

 “Supporting Letter of Credit” has the meaning specified in
Section 1.3(g). 
 “Swap Obligations” means with respect to a Loan Party, its
obligations under a Hedge Agreement that constitutes a “swap” within the meaning of Section 1a(47) of the Commodity Exchange Act. 

“Taxes” means all present or future taxes, levies, imposts, duties, deductions, withholdings, assessments, fees or
other charges imposed by any Governmental Authority, including any interest, additions to tax or penalties applicable thereto. 

“Termination Date” means the earliest to occur of (a) the Stated Termination Date, (b) the date the Total
Facility is terminated either by the Borrowers pursuant to Section 3.2 or by the Required Lenders pursuant to Section 9.2, and (c) the date this Agreement is otherwise terminated for any reason whatsoever
pursuant to the terms of this Agreement. 
 “Tangible Assets” means the total consolidated assets,
less goodwill and intangibles, of the Loan Parties, as determined in accordance with GAAP and reported in accordance with this Agreement. 

“Total Facility” has the meaning specified in Section 1.1. 

“Triggering Date” means the date upon which the Availability is less than or equal to the greater of (a) 10% of
the Maximum Revolver Amount and (b) $40,000,000 at any time; provided that in the event the Availability has been the greater of (i) 10% of the Maximum Revolver Amount and (ii) $40,000,000 at all
times for thirty (30) consecutive Business Days, then the Triggering Date shall be deemed to not be continuing for purposes of this Agreement, and the requirements of Section 7.21 shall not be required unless a subsequent
Triggering Date occurs.  
 “UCC” means the Uniform Commercial Code, as in effect from time to time,
of the State of New York or of any other state the laws of which are required as a result thereof to be applied in connection with the issue of perfection of security interests; provided that to the extent that the
UCC is used to define any term herein or in any other documents and such term is defined differently in different Articles or Divisions of the UCC, the definition of such term contained in Article or Division 9 shall govern. 

“Unfunded Pension Liability” means the excess, if any, of (a) the funding target as defined under
Section 430(d) of the Code without regard to the special at-risk rules of Section 430(i) of the Code; over (b) the value of plan assets as defined under Section 430(g)(3)(A) of the Code determined as of the last day of each
calendar year, without regard to the averaging which may be allowed under Section 430(g)(3)(B) of the Code and reduced for any prefunding balance or funding standard carryover balance as defined and provided for in Section 430(f) of the
Code. 
 “Unrestricted Subsidiary” means unless and until designated a Restricted Subsidiary in
accordance with the terms of this Agreement, (a) Westlake International Services Corporation, Westlake Chemical (Asia) Inc., Westlake Chemical (China) Corporation, Westlake International II LLC, Westlake Chemical Partners GP LLC, Westlake
Chemical OpCo GP LLC and Westlake Chemical Partners LP, (b) any Foreign Subsidiary of Westlake or any other Loan Party, (c) any Project Finance Subsidiary, (d) any JV Subsidiary, (e) any Subsidiary of an Unrestricted Subsidiary
(other than Westlake Chemical OpCo LP, and any Subsidiary thereof) and (f) any other Subsidiary of Westlake that is designated by the Board of Directors of Westlake as an Unrestricted Subsidiary pursuant to a board resolution and in accordance
with Section 7.28 of this Agreement, but only to the extent that such Subsidiary: 
 (i) has no Debt other
than Non-Recourse Debt (except as permitted by Section 7.12(e) and (f)); 

 (ii) is not party to any agreement, contract, arrangement or understanding with
Westlake or any Restricted Subsidiary of Westlake unless the terms of any such agreement, contract, arrangement or understanding are no less favorable to Westlake or such Restricted Subsidiary than those that might be obtained at the time from
Persons who are not Affiliates of Westlake (except as permitted by Section 7.15); 
 (iii) is a Person
with respect to which neither Westlake nor any of its Restricted Subsidiaries has any direct or indirect obligation (x) to subscribe for additional equity interests or (y) to maintain or preserve such Person’s financial condition or
to cause such Person to achieve any specified levels of operating results; 
 (iv) has not guaranteed or otherwise provided
credit support for any Debt of Westlake or any of its Restricted Subsidiaries (except to the extent released or terminated); and 

(v) is not a guarantor or pledgor under any Indenture of any Loan Party. 

Any designation after the Closing Date of a Subsidiary of Westlake as an Unrestricted Subsidiary will be evidenced to the Agent by filing with
the Agent a certified copy of the Board Resolution giving effect to such designation and an Officers’ Certificate certifying that such designation complied with the preceding conditions and Section 7.28. If, at any time, any
Unrestricted Subsidiary designated after the Closing Date would fail to meet the preceding requirements as an Unrestricted Subsidiary, it will thereafter cease to be an Unrestricted Subsidiary for purposes of the Loan Documents and any Debt of such
Subsidiary will be deemed to be incurred by a Restricted Subsidiary of Westlake as of such date and, if such Indebtedness is not permitted to be incurred as of such date under Section 7.13, Westlake will be in default of such
Section 7.13. The Board of Directors of Westlake may at any time designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided that such designation will be deemed to be an incurrence of Debt by a Restricted
Subsidiary of Westlake of any outstanding Debt of such Unrestricted Subsidiary and such designation will only be permitted if (1) such Debt is permitted under Section 7.13; and (2) no Default or Event of Default would be
in existence following such designation. 
 “Unused Letter of Credit Subfacility” means the Letter of Credit
Subfacility minus the sum of (a) the aggregate undrawn amount of all outstanding Letters of Credit plus, without duplication, (b) the aggregate unpaid reimbursement obligations with respect to all Letters of Credit. 

“Unused Line Fee” has the meaning specified in Section 2.5. 

“U.S. Person” means “United States Person” as defined in Section 7701(a)(30) of the Code.

 “U.S. Tax Compliance Certificate” has the meaning specified in Section 4.2(b)(ii)(C).

 “Voting Stock” of any Person as of any date means the Capital Stock of such Person that is at the time
entitled to vote in the election of the board of directors of such Person. 
 “Withholding
Agent” means any Loan Party and the Agent. 

 Accounting Terms. Any accounting term used in the Agreement shall have, unless otherwise specifically
provided herein, the meaning customarily given in accordance with GAAP, and all financial computations in the Agreement shall be computed, unless otherwise specifically provided therein, in accordance with GAAP as consistently applied and using the
same method for inventory valuation as used in the preparation of the Financial Statements. If at any time any change in GAAP would affect the computation of any financial ratio or requirement set forth in any Loan Document, and either the Borrowers
or the Required Lenders shall so request, the Agent, the Lenders, and the Borrowers shall negotiate in good faith to amend such ratio or requirement to preserve the original intent thereof in light of such change in GAAP (subject to the approval of
the Required Lenders); provided that, until so amended, (a) such ratio or requirement shall continue to be computed in accordance with GAAP prior to such change therein and (b) the Borrowers shall provide to the Agent and the
Lenders Financial Statements and other documents required under this Agreement or as reasonably requested hereunder setting forth a reconciliation between calculations of such ratio or requirement made before and after giving effect to such change
in GAAP. 
 Interpretive Provisions. 

(a) The meanings of defined terms are equally applicable to the singular and plural forms of the defined terms. 

(b) The words “hereof,” “herein,” “hereunder” and similar words refer to the Agreement as
a whole and not to any particular provision of the Agreement; and Subsection, Section, Schedule and Exhibit references are to the Agreement unless otherwise specified. 

(c) (i) The term “documents” includes any and all instruments, documents, agreements, certificates, indentures, notices and
other writings, however evidenced. 
 (ii) The term “including” is not limiting and means “including
without limitation.” 
 (iii) In the computation of periods of time from a specified date to a later specified date,
the word “from” means “from and including,” the words “to” and “until” each mean “to but excluding” and the word “through” means “to and
including.” 
 (iv) The word “or” is not exclusive. 

(d) Unless otherwise expressly provided herein, (i) references to agreements (including the Agreement) and other
contractual instruments shall be deemed to include all subsequent amendments and other modifications thereto, but only to the extent such amendments and other modifications are not prohibited by the terms of any Loan Document, and
(ii) references to any statute or regulation are to be construed as including all statutory and regulatory provisions consolidating, amending, replacing, supplementing or interpreting the statute or regulation. 

(e) The captions and headings of the Agreement and other Loan Documents are for convenience of reference only and shall not
affect the interpretation of the Agreement. 
 (f) The Agreement and other Loan Documents may use several different
limitations, tests or measurements to regulate the same or similar matters. All such limitations, tests and measurements are cumulative and shall each be performed in accordance with their terms. 

 (g) For purposes of Section 9.1, a breach of the financial
covenant contained in Section 7.21 shall be deemed to have occurred as of any date of determination thereof by the Agent or as of the last day of any specified measuring period, regardless of when the Financial Statements
reflecting such breach are delivered to the Agent. 
 (h) The Agreement and the other Loan Documents are the result of
negotiations among and have been reviewed by counsel to the Agent, the Borrowers and the other parties, and are the products of all parties. Accordingly, they shall not be construed against the Lenders or the Agent merely because of the Agent’s
or Lenders’ involvement in their preparation. 

 EXHIBIT A 

FORM OF NOTE 
  

			
	$            	  	July 17, 2014

 For Value Received, the undersigned (referred to herein as the “Borrowers”) hereby
jointly and severally promise to pay to the order of                      (the “Lender”) in care of Bank of America,
N.A. (the “Agent”), at the Agent’s office located at 901 Main Street, Dallas, Texas, 75202, for the account of the Lender, the lesser of the principal amount of
                     ($            ) or the aggregate amount of all
outstanding Revolving Loans made to Borrowers by the Lender from time to time. The undersigned also promise to pay interest on the unpaid principal amount of each Borrowing from the date of such Borrowing until such principal amount is paid. This
Note shall be subject to the terms of that certain Credit Agreement described below (the “Credit Agreement”), and all principal and interest payable hereunder shall be due and payable in accordance with the terms of the
Credit Agreement. 
 This Note is the Note referred to in the Third Amended and Restated Credit Agreement, dated as of July 17, 2014,
among the Borrowers, the Lender, certain other Lenders party thereto, and Bank of America, N.A., as Agent for the Lenders, as amended, renewed, and refinanced from time to time. Terms defined in the Credit Agreement are used herein with the same
meanings. The Credit Agreement, among other things, contains provisions for acceleration of the maturity of this Note, upon the happening of certain stated events and also for prepayments on account of the principal of this Note prior to the
maturity of this Note upon the terms and conditions specified in the Credit Agreement. Without limiting the immediately preceding sentence, reference is made to Section 2.3 of the Credit Agreement for usury savings provisions.

 Principal and interest payments shall be in money of the United States of America, lawful at such times for the satisfaction of public
and private debts, and shall be in immediately available funds. 
 The Borrowers jointly and severally promise to pay the costs of
collection, including reasonable attorney’s fees, if default is made in the payment of this Note. 
 [This Note is in renewal and
replacement, and not extinguishment, of the Second Amended and Restated Note dated September 16, 2011, of the Amended and Restated Note dated September 8, 2008 made by the Borrowers under the Existing Credit Agreement, payable to the order
of the Lender and any amendments and restatements thereof, which amended and restated the Amended and Restated Note dated September 8, 2008 made by the Borrowers under the Amended and Restated Credit Agreement dated September 8, 2008,
payable to the order of the Lender and any amendments and restatements thereof which amended and restated the Note dated July 31, 2003 made by the original Borrowers under the Credit Agreement dated July 31, 2003, payable to the order of
the Lender and any amendments and restatements thereof.] 
 THIS NOTE AND THE OTHER LOAN DOCUMENTS HAVE BEEN ENTERED INTO PURSUANT TO
SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW AND THE SUBSTANTIVE LAWS OF THE STATE OF NEW YORK, AND THE APPLICABLE FEDERAL LAWS OF THE UNITED STATES OF AMERICA SHALL GOVERN THE VALIDITY, CONSTRUCTION, ENFORCEMENT, AND INTERPRETATION
HEREOF. 

  

					
		 		 	Exhibit A

 IN WITNESS WHEREOF, the undersigned have caused this Note to be executed by officers thereunto duly authorized
and directed by appropriate corporate authority. 
 [Remainder of Page Intentionally Left Blank; Signatures Follow] 

  

					
		 	2	 	Exhibit A

 BORROWERS: 

			
	
	 WESTLAKE CHEMICAL CORPORATION,

a Delaware corporation

	WESTLAKE PVC CORPORATION, a Delaware corporation
	WESTLAKE VINYLS, INC., a Delaware corporation
	 WESTLAKE LONGVIEW CORPORATION,

a Delaware corporation

	 WESTLAKE ETHYLENE PIPELINE CORPORATION,

a Delaware corporation

	 WESTLAKE SUPPLY AND TRADING COMPANY,

a Delaware corporation

		
	By:	 	  

		 	Albert Chao
		 	President of the above Borrowers

  

					
		 	3	 	Exhibit A

 
			
	 NORTH AMERICAN PIPE CORPORATION,

a Delaware corporation
 WESTECH BUILDING PRODUCTS,
INC.,
 a Delaware corporation

		
	By:  	 	 
		 	Robert F. Buesinger
		 	President of the above Borrowers
	
	NORTH AMERICAN SPECIALTY PRODUCTS LLC
		
	By:  	 	North American Pipe Corporation, its manager
		
	By:  	 	 
		 	Robert F. Buesinger
		 	President of the manager of the above Borrower

  

					
		 	4	 	Exhibit A

 
					
	WESTLAKE VINYLS COMPANY LP,
	a Delaware limited partnership
	
	By: GVGP, Inc., its general partner
			
		 	 By:
	 	  

		 		 	Albert Chao
		 		 	President of the general partner of the above Borrower

  

	
	WESTLAKE PETROCHEMICALS LLC,
	a Delaware limited liability company
	 WESTLAKE POLYMERS LLC,
 a Delaware
limited liability company

	 WESTLAKE STYRENE LLC,
 a Delaware limited
liability company

	WPT LLC, a Delaware limited liability company

  

			
	By:  	 	Westlake Chemical Investments, Inc., its manager
		
	By:  	 	  

		 	Albert Chao
		 	President of the manager of the above Borrowers

  

					
		 	5	 	Exhibit A

 EXHIBIT B 

FORM OF BORROWING BASE CERTIFICATE 

REPORTING DATE: 
  

	To:	BANK OF AMERICA, N.A., individually as a Lender and as agent for itself and the other Lenders (the “Agent”) under that certain Third Amended and Restated Credit Agreement dated as of
July 17, 2014 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit Agreement”), by and among the Agent, Westlake Chemical Corporation and certain of its domestic
subsidiaries listed as Borrowers thereto (collectively, the “Borrowers”), and the Lenders party thereto. 

Reference is hereby made to the Credit Agreement, the terms defined therein being used herein as therein defined. This Borrowing Base Certificate is delivered
pursuant to the terms of the Credit Agreement. 
 The undersigned hereby certifies and warrants to the Agent and the Lenders on behalf of the Borrowers as
follows: 
 (a) I am a duly qualified and acting Responsible Officer of Westlake, and I am familiar with the financial statements and
financial affairs of the Loan Parties. I am authorized to execute this Borrowing Base Certificate on behalf of the Loan Parties. 
 (a)
Attached hereto as Schedule 1 are true and correct computations of the Borrowing Base under the Credit Agreement as of the date set forth below. 

The Borrowers further represent and warrant to the Agent and the Lenders that the representations and warranties contained in
Article VI of the Credit Agreement are true and correct in all material respects on and as of the date of this Borrowing Base Certificate as if made on and as of the date hereof (except to the extent that such representations and
warranties expressly refer to an earlier date, in which case they shall be true and correct in all material respects as of such earlier date and except to the extent that (a) the Agent and the Lenders have been notified in writing by the
Borrowers that any representation or warranty is not correct and the Required Lenders have explicitly waived in writing compliance with such representation or warranty or (b) any representation or warranty has been qualified by the updated
information reflected in, and as permitted under, the Compliance Certificate submitted by Westlake to the Agent periodically), and that no Event of Default or Default has occurred and is continuing, except as disclosed in an attachment to this
Certificate. 
 IN WITNESS WHEREOF, Westlake has caused this Borrowing Base Certificate to be executed and delivered on this
     day of             , 20    . 
  

					
	WESTLAKE CHEMICAL CORPORATION, on its behalf and as agent for the other Borrowers
		
	By:    	 	  

		 	Name:    	 	  

		 	Title:    	 	  

  

					
		 		 	Exhibit B

 SCHEDULE 1 

  

					
		 	2	 	Exhibit B

 EXHIBIT C 

FORM OF OBLIGATION GUARANTY 

THIS OBLIGATION GUARANTY (this “Guaranty”) is executed as of
[            ], 2014, by the undersigned (each individually a “Guarantor” and together with the other Guarantors defined in the Credit Agreement described
below, the “Guarantors”), for the benefit of BANK OF AMERICA, N.A., a national banking association (in its capacity as Agent for the benefit of Lenders (defined below)). 

RECITALS 
 A.
Pursuant to that certain Third Amended and Restated Credit Agreement dated as of July 17, 2014, by and among Westlake Chemical Corporation and certain of its direct and indirect subsidiaries (collectively, “Borrowers”),
Agent, and certain lenders (“Lenders”) (including all annexes, exhibits, and schedules thereto, as from time to time amended, restated, supplemented, or otherwise modified, the “Credit Agreement”),
Lenders have agreed to make the Loans and issue Letters of Credit on behalf of Borrowers; 
 B. The provisions of the Credit Agreement
permit each Guarantor and the other Guarantors to directly or indirectly receive proceeds of Borrowings made pursuant thereto; 
 C. This
Guaranty is integral to the transactions contemplated by the Loan Documents and the execution and delivery hereof is required by the Credit Agreement; and 

D. In order to induce Lenders to continue making the Loans and continue issuing Letters of Credit as provided for in the Credit Agreement,
each Guarantor has agreed to execute and deliver this Guaranty. 
 ACCORDINGLY, for adequate and sufficient consideration, the receipt and
adequacy of which are hereby acknowledged, each Guarantor, jointly and severally (together with the other Guarantors and any other Person that has executed or executes an Obligation Guaranty), guarantees to Agent and Lenders the prompt payment of
the Guaranteed Debt (defined below) as follows: 
 1. DEFINITIONS. Terms defined in the Credit Agreement or in Annex A thereto
have the same meanings when used, unless otherwise defined, in this Guaranty. As used in this Guaranty: 
 Agent is
defined in the recitals to this Guaranty. 
 Borrowers means Borrowers, any Borrower as debtors-in-possession, and any
receiver, trustee, liquidator, conservator, custodian, or similar party appointed for any Borrower or for all or substantially all of any Borrower’s assets under any Debtor Relief Law. 

Credit Agreement is defined in the recitals to this Guaranty. 

Debtor Relief Law means the Bankruptcy Code of the United States of America and all other applicable liquidation,
conservatorship, bankruptcy, moratorium, rearrangement, receivership, insolvency, reorganization, fraudulent transfer or conveyance, suspension of payments, or similar laws from time to time in effect affecting the rights of creditors generally.

 Guaranteed Debt means, collectively, (a) the Obligations and (b) all
present and future costs, Attorney Costs, and expenses reasonably incurred by Agent or any Lender to enforce any Borrower’s, any Guarantor’s, or any other obligor’s payment of any of the Guaranteed Debt, including, without limitation
(to the extent lawful), all present and future amounts that would become due but for the operation of §§ 502 or 506 or any other provision of Title 11 of the United States Code and all present and future
accrued and unpaid interest (including, without limitation, all post-maturity interest and any post-petition interest in any proceeding under Debtor Relief Laws to which any Borrower or any Guarantor becomes subject). 

Guarantor and Guarantors is defined in the preamble to this Guaranty. 

Lender means, individually, or Lenders means, collectively, the Agent, the Lenders, each Letter of Credit Issuer,
and each Person that, at the date it enters into a Hedge Agreement with a Loan Party, is a Lender or an Affiliate of a Lender, and each Affiliate of a Lender that is a party to any Bank Product with any Loan Party, but with respect to any Hedge
Agreement or Bank Product, in compliance with Section 7.23 of the Credit Agreement. 
 Subordinated Debt
means, for each Guarantor, all present and future obligations of any Loan Party to such Guarantor, whether those obligations are (a) direct, indirect, fixed, contingent, liquidated, unliquidated, joint, several, or joint and several,
(b) due or to become due to such Guarantor, (c) held by or are to be held by such Guarantor, (d) created directly or acquired by assignment or otherwise, or (e) evidenced in writing. 

2. GUARANTY. This is an absolute, irrevocable, and continuing guaranty of payment, not collection, and the circumstance that at any
time or from time to time the Guaranteed Debt may be paid in full does not affect the joint and several obligation of any Guarantor with respect to the Guaranteed Debt incurred after that. This Guaranty remains in effect until the Guaranteed Debt is
fully paid and performed (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of the Credit Agreement and are not yet due and payable at such termination), all
commitments to extend any credit under the Loan Documents have terminated, all Letters of Credit which have not been fully cash collateralized have expired or been terminated, and all Hedge Agreements with any Lender have expired. No Guarantor may
rescind or revoke its obligations with respect to the Guaranteed Debt. Notwithstanding any contrary provision, it is the intention of Guarantors, Lenders, and Agent that the amount of the Guaranteed Debt guaranteed by any Guarantor by this Guaranty
shall be, but not in excess of, the maximum amount permitted by fraudulent conveyance, fraudulent transfer, or similar laws applicable to such Guarantor. Accordingly, notwithstanding anything to the contrary contained in this Guaranty or any other
agreement or instrument executed in connection with the payment of any of the Guaranteed Debt, the amount of the Guaranteed Debt guaranteed by any Guarantor by this Guaranty shall be limited to an aggregate amount equal to the largest amount that
would not render such Guarantor’s obligations hereunder subject to avoidance under Section 548 of the United States Bankruptcy Code or any comparable provision of any applicable state law. 

3. CONSIDERATION. Each Guarantor represents and warrants that its liability under this Guaranty may reasonably be expected to directly
or indirectly benefit it. 
 4. CUMULATIVE RIGHTS. If any Guarantor becomes liable for any indebtedness owing by any Borrower to
Agent or any Lender, other than under this Guaranty, that liability shall not be in any manner impaired or affected by this Guaranty. The rights of Agent or Lenders under this Guaranty are cumulative of any and all other rights that Agent or
Lenders may ever have against any Guarantor. The exercise by Agent or Lenders of any right under this Guaranty or otherwise does not preclude the concurrent or subsequent exercise of any other right. 

  
 2 

 5. PAYMENT UPON DEMAND. If an Event of Default exists, each Guarantor shall, on demand and
without further notice of dishonor and without any notice having been given to any Guarantor previous to that demand of either the acceptance by Agent or Lenders of this Guaranty or the creation or incurrence of any Guaranteed Debt, pay the amount
of the Guaranteed Debt then due and payable to Agent and Lenders; provided that, if an Event of Default exists and Agent or Lenders cannot, for any reason, accelerate the Obligations, then the Guaranteed Debt shall be, as among each
Guarantor, Agent, and Lenders, a fully matured, due, and payable obligation of such Guarantor to Agent and Lenders. It is not necessary for Agent or Lenders, in order to enforce that payment by any Guarantor, first or contemporaneously to institute
suit or exhaust remedies against any Borrower or any other Guarantor or others liable on any Guaranteed Debt or to enforce rights against any Collateral securing any Guaranteed Debt. 

6. SUBORDINATION. The Subordinated Debt is expressly subordinated to the full and final payment of the Guaranteed Debt. Each Guarantor
agrees not to accept any payment of any Subordinated Debt from any Loan Party if an Event of Default exists. If any Guarantor receives any payment of any Subordinated Debt in violation of the foregoing, such Guarantor shall hold that payment in
trust for Agent and Lenders and promptly turn it over to Agent, in the form received (with any necessary endorsements), to be applied to the Guaranteed Debt. 

7. SUBROGATION AND CONTRIBUTION. Until payment in full of the Guaranteed Debt, the termination of the obligation of Lenders to extend
credit under the Loan Documents, and expiration of all Hedge Agreements between any Loan Party and any Lender, (a) no Guarantor may assert, enforce, or otherwise exercise any right of subrogation to any of the rights or Liens of Agent or
Lenders or any other beneficiary against any Borrower, any other Guarantor or any other obligor on the Guaranteed Debt or any Collateral or other security or any right of recourse, reimbursement, subrogation, contribution, indemnification, or
similar right against any Borrower, any other Guarantor or any other obligor on any Guaranteed Debt or any guarantor of it, (b) each Guarantor defers all of the foregoing rights (whether they arise in equity, under contract, by statute, under
common law, or otherwise), and (c) each Guarantor defers the benefit of, and subordinates any right to participate in, any Collateral or other security given to Agent or Lenders or any other beneficiary to secure payment of any Guaranteed Debt.

 8. NO RELEASE. Each Guarantor’s obligations under this Guaranty shall not be released, diminished, or affected by the
occurrence of any one or more of the following events: (a) any taking or accepting of any other security or assurance for any Guaranteed Debt; (b) any release, surrender, exchange, subordination, impairment, or loss of any Collateral
securing any Guaranteed Debt; (c) any full or partial release of the liability of any other Guarantor or other obligor on any Guaranteed Debt, except for any final release resulting from payment in full of such Guaranteed Debt;
(d) the modification of, or waiver of compliance with, any terms of any other Loan Document; (e) the insolvency, bankruptcy, or lack of corporate or partnership power of any other Guarantor or other obligor at any time liable for any
Guaranteed Debt, whether now existing or occurring in the future; (f) any renewal, extension, or rearrangement of any Guaranteed Debt or any adjustment, indulgence, forbearance, or compromise that may be granted or given by Agent or any Lender
to any other obligor on any Guaranteed Debt; (g) any neglect, delay, omission, failure, or refusal of Agent or any Lender to take or prosecute any action in connection with the Guaranteed Debt or to foreclose, take, or prosecute any action in
connection with any Loan Document; (h) any failure of Agent or any Lender to notify any Guarantor or any other Guarantor of any renewal, extension, or assignment of any Guaranteed Debt, or the release of any security or of any

  
 3 

 
other action taken or refrained from being taken by Agent or any Lender against any Borrower or any new agreement between Agent, any Lender, and any Borrower; it being understood that
neither Agent nor any Lender is required to give any Guarantor any notice of any kind under any circumstances whatsoever with respect to or in connection with any Guaranteed Debt, other than any notice required to be given to any Guarantor by
law or elsewhere in this Guaranty; (i) the unenforceability of any Guaranteed Debt against any other obligor or any security securing same because it exceeds the amount permitted by law, the act of creating it is ultra vires, the
officers creating it exceeded their authority or violated their fiduciary duties in connection with it, or otherwise; or (j) any payment of any Guaranteed Debt to Agent or any Lender is held to constitute a preference under any Debtor Relief
Law or for any other reason Agent or any Lender is required to refund that payment or make payment to someone else (and in each such instance this Guaranty will be reinstated in an amount equal to that payment). 

9. WAIVERS. By execution hereof, each Guarantor acknowledges and agrees to the waivers set forth in Section 13.9 of
the Credit Agreement. To the maximum extent lawful, each Guarantor waives all rights by which it might be entitled to require suit on an accrued right of action in respect of any Guaranteed Debt or require suit against any Borrower or others. 

10. LOAN DOCUMENTS. By execution hereof, each Guarantor covenants and agrees that certain representations, warranties, terms,
covenants, and conditions set forth in the Loan Documents are applicable to it and the other Guarantors and shall be imposed upon it and the other Guarantors, and each Guarantor reaffirms that each such representation and warranty is true and
correct and covenants and agrees to promptly and properly perform, observe, and comply with each such term, covenant, or condition. Moreover, each Guarantor acknowledges and agrees that this Guaranty is subject to the offset provisions of the Loan
Documents in favor of Agent and Lenders. In the event the Credit Agreement or any other Loan Document shall cease to remain in effect for any reason whatsoever during any period when any part of the Guaranteed Debt remains unpaid, the terms,
covenants, and agreements of the Credit Agreement or such other Loan Document incorporated herein by reference shall nevertheless continue in full force and effect as obligations of each Guarantor under this Guaranty. 

11. RELIANCE AND DUTY TO REMAIN INFORMED. Each Guarantor confirms that it has executed and delivered this Guaranty after reviewing the
terms and conditions of the Loan Documents and such other information as it has deemed appropriate in order to make its own credit analysis and decision to execute and deliver this Guaranty. Each Guarantor confirms that it has made its own
independent investigation with respect to Borrowers’ creditworthiness and is not executing and delivering this Guaranty in reliance on any representation or warranty by Agent or any Lender as to that creditworthiness. Each Guarantor expressly
assumes all responsibilities to remain informed of the financial condition of Borrowers and any circumstances affecting Borrowers’ ability to perform under the Loan Documents to which it is a party or any Collateral securing any Guaranteed
Debt. 
 12. NO REDUCTION. The Guaranteed Debt shall not be reduced, discharged, or released because or by reason of any existing or
future offset, claim, or defense (except for the defense of complete and final payment of the Guaranteed Debt) of any Borrower or any other obligor against Agent or any Lender or against payment of the Guaranteed Debt, whether that offset,
claim, or defense arises in connection with the Guaranteed Debt or otherwise. Those claims and defenses include, without limitation, failure of consideration, breach of warranty, fraud, bankruptcy, incapacity/infancy, statute of limitations, lender
liability, accord and satisfaction, usury, forged signatures, mistake, impossibility, frustration of purpose, and unconscionability. 

  
 4 

 13. INSOLVENCY OF GUARANTOR. Should any Guarantor become insolvent, or fail to pay such
Guarantor’s debts generally as they become due, or voluntarily seek, consent to, or acquiesce in, the benefit or benefits of any Debtor Relief Law (other than as a creditor or claimant), or become a party to (or be made the subject of)
any proceeding provided for by any Debtor Relief Law (other than as a creditor or claimant) that could suspend or otherwise adversely affect the rights of Agent or any Lender granted hereunder, then, in any such event, the Guaranteed Debt
shall be, as among such Guarantor, Agent and Lenders, a fully matured, due, and payable obligation of such Guarantor to Agent and Lenders (without regard to whether any Borrower is then in default under the Loan Documents or whether the Obligations,
or any part thereof, is then due and owing by any Borrower to any Lender), payable in full by such Guarantor to Lenders upon demand, and the amount thereof so payable shall be the estimated amount owing in respect of the contingent claim created
hereunder. 
 14. LOAN DOCUMENT. This Guaranty is a Loan Document and is subject to the applicable provisions of
Section 13 of the Credit Agreement, including, without limitation, the provisions relating to GOVERNING LAW, CHOICE OF FORUM, SERVICE OF PROCESS AND JURISDICTION, AND WAIVER OF JURY TRIAL, all of which are incorporated into
this Guaranty by reference the same as if set forth in this Guaranty verbatim. 
 15. NOTICES. To be effective, notices required or
permitted to be given under this Guaranty must be in writing, shall be delivered as provided in Section 13.8 of the Credit Agreement to the address or facsimile number set forth on the signature pages to this Guaranty, and shall
be effective as provided in Section 13.8 of the Credit Agreement. 
 16. AMENDMENTS, ETC. No amendment, waiver, or
discharge to or under this Guaranty is valid unless it is in writing and is signed by the party against whom it is sought to be enforced. 

17. AGENT AND LENDERS. Agent is Agent for each Lender under the Credit Agreement. All rights granted to Agent under or in connection
with this Guaranty are for each Lender’s ratable benefit. Agent may, without the joinder of any Lender, exercise any rights in Agent’s or Lenders’ favor under or in connection with this Guaranty. Agent’s and each Lender’s
rights and obligations vis-à-vis each other may be subject to one or more separate agreements between those parties. However, no Guarantor is required to inquire about any such agreement or is subject to any terms of such agreement
unless such Guarantor specifically joins such agreement. Therefore, no Guarantor nor any of its successors or assigns is entitled to any benefits or provisions of any such separate agreement or is entitled to rely upon or raise as a defense
any party’s failure or refusal to comply with the provisions of such agreement. 
 18. PARTIES. This Guaranty benefits Agent,
Lenders, and their respective successors and assigns and binds each Guarantor and its successors and assigns. Upon appointment of any successor Agent under the Credit Agreement, all of the rights of Agent under this Guaranty automatically vest in
that new Agent as successor Agent on behalf of Lenders without any further act, deed, conveyance, or other formality other than that appointment. The rights of Agent and Lenders under this Guaranty may be transferred with any assignment of
the Guaranteed Debt. The Credit Agreement contains provisions governing assignments of the Guaranteed Debt and of rights and obligations under this Guaranty. 

Remainder of Page Intentionally Blank. 

Signature Page(s) to Follow. 

  
 5 

 EXECUTED as of the date first stated in this Guaranty. 

 

			
	GUARANTOR:
	
	 WESTLAKE CHEMICAL OPCO LP,
 a
Delaware limited partnership

		
	By:    	 	 
		 	Name:
		 	Title:

  

					
		 		 	Exhibit C

 EXHIBIT D 

FORM OF NOTICE OF BORROWING 
 Date:
            , 20     
  

	To:	BANK OF AMERICA, N.A., individually as a Lender and as agent for itself and the other Lenders (the “Agent”) under that certain Third Amended and Restated Credit Agreement dated as of
July 17, 2014 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit Agreement”), by and among the Agent, Westlake Chemical Corporation and certain of its domestic
subsidiaries listed as Borrowers thereto (collectively, the “Borrowers”), and the Lenders party thereto. 

 Ladies and
Gentlemen: 
 The undersigned, Westlake Chemical Corporation (“Westlake”), on its behalf and as agent for the other
Borrowers refers to the Credit Agreement, the terms defined therein being used herein as therein defined, and hereby gives you notice irrevocably of the Borrowing specified below: 

 

	1.	The Business Day of the proposed Borrowing is             , 20    . 

 

	2.	The aggregate amount of the proposed Borrowing is $            . 

  

	3.	The Borrowing is to be comprised of $             of Base Rate and $             of
LIBOR Rate Loans. 

  

	4.	The duration of the Interest Period for the LIBOR Rate Loans, if any, included in the Borrowing shall be
                     month[s]. 

  

	5.	Name of Borrower or Borrowers to receive all or any portion of the requested Borrowing and the amount to be advanced to such Borrower or Borrowers:
                                        

 The undersigned hereby certifies that the following statements are true on the date hereof, and will be true on the date of the proposed
Borrowing, before and after giving effect thereto and to the application of the proceeds therefrom: 
 (a) The representations and warranties
of the Loan Parties contained in the Credit Agreement are true and correct as though made on and as of such date and except to the extent that (i) the Agent and the Lenders have been notified in writing by any Borrower that any representation
or warranty is not correct and the Required Lenders have explicitly waived in writing compliance with such representation or warranty or (ii) any representation or warranty has been qualified by the updated information reflected in, and as
permitted under, the Compliance Certificate submitted by Westlake to the Agent periodically; 
 (b) No Default or Event of Default has
occurred and is continuing, or would result from such proposed Borrowing; and 
 (c) The proposed Borrowing will not cause the aggregate
principal amount of all outstanding Revolving Loans plus the aggregate amount available for drawing under all outstanding Letters of Credit, to exceed the Borrowing Base or the Maximum Revolver Amount. 

  

					
		 		 	Exhibit D

 IN WITNESS WHEREOF, Westlake has caused this Notice of Borrowing to be executed and delivered on
this          day of             , 20    . 

 

					
	WESTLAKE CHEMICAL CORPORATION, on its behalf and as agent for the other Borrowers
		
	By:  	 	  

		 	Name:	 	  

		 	Title:	 	  

  

					
		 	2	 	Exhibit D

 EXHIBIT E 

FORM OF NOTICE OF CONTINUATION/CONVERSION 
  

	
	Date:             , 20    

 To: BANK OF AMERICA, N.A., individually as a Lender and as agent for itself and the other Lenders (the
“Agent”) under that certain Third Amended and Restated Credit Agreement dated as of July 17, 2014 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit
Agreement”), by and among the Agent, Westlake Chemical Corporation and certain of its domestic subsidiaries listed as Borrowers thereto (collectively, the “Borrowers”), and the Lenders party thereto. 

Ladies and Gentlemen: 
 The undersigned, Westlake Chemical
Corporation (“Westlake”), on its behalf and as agent for the other Borrowers refers to the Credit Agreement, the terms defined therein being used herein as therein defined, and hereby gives you notice irrevocably of the
[conversion] [continuation] of the Revolving Loans specified herein, that: 
  

	 	1.	The Continuation/Conversion Date is             , 20    . 

 

	 	2.	The aggregate amount of the Revolving Loans to be [converted] [continued] is $            . 

 

	 	3.	The Revolving Loans are to be [converted into] [continued as] [LIBOR Rate] [Base Rate] Loans. 

  

	 	4.	The duration of the Interest Period for the LIBOR Rate Loans included in the [conversion] [continuation] shall be              month[s].

 The undersigned hereby certifies that the following statements are true on the date hereof, and will be true on the proposed
Continuation/Conversion Date, before and after giving effect thereto and to the application of the proceeds therefrom: 
 The proposed
conversion-continuation will not cause the aggregate principal amount of all outstanding Revolving Loans plus the aggregate amount available for drawing under all outstanding Letters of Credit to exceed the Borrowing Base or the Maximum Revolver
Amount. 
 IN WITNESS WHEREOF, Westlake has caused this Notice of Continuation/Conversion to be executed and delivered on this
     day of             , 20    . 
  

 

					
	WESTLAKE CHEMICAL CORPORATION, on its behalf and as agent for the other Borrowers
		
	By:    	 	  

		 	Name:    	 	  

		 	Title:    	 	  

  

					
		 		 	Exhibit E

 EXHIBIT F 

ASSIGNMENT AND ACCEPTANCE AGREEMENT 

This ASSIGNMENT AND ACCEPTANCE AGREEMENT (this “Assignment and Acceptance”) dated as of
            , 20     is made between              (the
“Assignor”) and              (the “Assignee”). 

RECITALS 

WHEREAS, the Assignor is party to that certain Third Amended and Restated Credit Agreement dated as of July 17, 2014 (as amended, amended
and restated, modified, supplemented, or renewed, the “Credit Agreement”) by and among Westlake Chemical Corporation and certain of its domestic subsidiaries listed as Borrowers thereto (collectively, the
“Borrowers”), the several financial institutions from time to time party thereto (including the Assignor, the “Lenders”), and Bank of America, N.A., as agent for the Lenders (the
“Agent”). Any terms defined in the Credit Agreement and not defined in this Assignment and Acceptance are used herein as defined in the Credit Agreement; 

WHEREAS, as provided under the Credit Agreement, the Assignor has committed to make Revolving Loans (the “Revolving Committed
Loans”) to the Borrowers in an aggregate amount not to exceed $             (the “Revolving Commitment”); 

WHEREAS, the Assignor has made Revolving Committed Loans in the aggregate principal amount of
$             to the Borrowers; 
 WHEREAS, [the Assignor has acquired a
participation in its pro rata share of the Letter of Credit Issuers’ liabilities under Letters of Credit in an aggregate principal amount of $             (the “L/C
Obligations”)] [no Letters of Credit are outstanding under the Credit Agreement]; and 
 WHEREAS, the Assignor wishes to assign
to the Assignee [part of the] [all] rights and obligations of the Assignor under the Credit Agreement in respect of its Revolving Commitment, together with a corresponding portion of each of its outstanding Revolving Committed Loans and L/C
Obligations, in an aggregate amount equal to $             (the “Assigned Amount”) on the terms and subject to the conditions set forth herein and the
Assignee wishes to accept assignment of such rights and to assume such obligations from the Assignor on such terms and subject to such conditions; 

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, the parties hereto agree as follows: 

 

	1.	Assignment and Acceptance. 

 (a) Subject to the terms and
conditions of this Assignment and Acceptance, (i) the Assignor hereby sells, transfers, and assigns to the Assignee, and (ii) the Assignee hereby purchases, assumes, and undertakes from the Assignor, without recourse and without
representation or warranty (except as provided in this Assignment and Acceptance) __% (the “Assignee’s Percentage Share”) of (A) the Revolving Commitment, the Revolving Committed Loans, and the L/C Obligations of
the Assignor and (B) all related rights, benefits, obligations, liabilities, and indemnities of the Assignor under and in connection with the Credit Agreement and the Loan Documents. 

  

					
		 		 	Exhibit F

 (b) With effect on and after the Effective Date (as defined in
Section 5 hereof), the Assignee shall be a party to the Credit Agreement and succeed to all of the rights and be obligated to perform all of the obligations of a Lender under the Credit Agreement, including the requirements
concerning confidentiality and the payment of indemnification, with a Revolving Commitment in an amount equal to the Assigned Amount. The Assignee agrees that it will perform in accordance with their terms all of the obligations which by the terms
of the Credit Agreement are required to be performed by it as a Lender. It is the intent of the parties hereto that the Revolving Commitment of the Assignor shall, as of the Effective Date, be reduced by an amount equal to the Assigned Amount, and
the Assignor shall relinquish its rights and be released from its obligations under the Credit Agreement to the extent such obligations have been assumed by the Assignee; provided, however, the Assignor shall not relinquish its rights
under Sections 3.8, 4, and 13.11 of the Credit Agreement to the extent such rights relate to the time prior to the Effective Date. 

(c) After giving effect to the assignment and assumption set forth herein, on the Effective Date the Assignee’s Revolving
Commitment will be $             and Revolving Committed Loans will be $            . 

(d) After giving effect to the assignment and assumption set forth herein, on the Effective Date the Assignor’s Revolving
Commitment will be $             and Revolving Committed Loans will be $            . 

 

	2.	Payments. 

 (a) As consideration for the sale, assignment, and
transfer contemplated in Section 1 hereof, the Assignee shall pay to the Assignor on the Effective Date in immediately available funds an amount equal to the purchase price agreed between the Assignor and the Assignee for the
Assigned Amount. 
 (b) The [Assignor] [Assignee] further agrees to pay to the Agent a processing fee in the amount specified
in Section 11.2(a) of the Credit Agreement. 
  

	3.	Reallocation of Payments. 

 Any interest, fees, and other payments accrued to the
Effective Date with respect to the Revolving Commitment, Revolving Committed Loans, and L/C Obligations shall be for the account of the Assignor. Any interest, fees, and other payments accrued on and after the Effective Date with respect to the
Assigned Amount shall be for the account of the Assignee. Each of the Assignor and the Assignee agrees that it will hold in trust for the other party any interest, fees, and other amounts which it may receive to which the other party is entitled
pursuant to the preceding sentence and pay to the other party any such amounts which it may receive promptly upon receipt. 
  

	4.	Independent Credit Decision. 

 The Assignee (a) acknowledges that it has
received a copy of the Credit Agreement and the Schedules and Exhibits thereto, together with copies of the most recent Financial Statements of the Loan Parties, and such other documents and information as it has deemed appropriate to make its own
credit and legal analysis and decision to enter into this Assignment and Acceptance; and (b) agrees that it will, independently and without reliance upon the Assignor, the Agent, or any other Lender and based on such documents and information
as it shall deem appropriate at the time, continue to make its own credit and legal decisions in taking or not taking action under the Credit Agreement. 

  

					
		 	2	 	Exhibit F

	5.	Effective Date; Notices. 

 (a) As between the Assignor and the
Assignee, the effective date for this Assignment and Acceptance shall be             , 20     (the “Effective Date”);
provided that the following conditions precedent have been satisfied on or before the Effective Date: 
 (i) this
Assignment and Acceptance shall be executed and delivered by the Assignor and the Assignee; 
 (ii) the consent of the Agent
(if necessary) required for an effective assignment of the Assigned Amount by the Assignor to the Assignee shall have been duly obtained and shall be in full force and effect as of the Effective Date; 

(iii) the Assignee shall pay to the Assignor all amounts due to the Assignor under this Assignment and Acceptance; 

(iv) the Assignee shall have complied with Section 11.2 of the Credit Agreement (if applicable); 

(v) the processing fee referred to in Section 2(b) hereof and in Section 11.2(a) of the
Credit Agreement shall have been paid to the Agent; and 
 (b) Promptly following the execution of this Assignment and
Acceptance, the Assignor shall deliver to the Borrowers and the Agent for acknowledgment by the Agent, a Notice of Assignment in the form attached hereto as Schedule 1. 

 

	6.	Agent. 

 (a) The Assignee hereby appoints and authorizes the Agent
to take such action as agent on its behalf and to exercise such powers under the Credit Agreement as are delegated to the Agent by the Lenders pursuant to the terms of the Credit Agreement. 

[INCLUDE (b) ONLY IF ASSIGNOR IS AGENT] 

(b) [The Assignee shall assume no duties or obligations held by the Assignor in its capacity as Agent under the Credit
Agreement.] 
  

	7.	Withholding Tax. 

 The Assignee (a) represents and warrants to the Agent and the
Borrowers that under applicable law and treaties no tax will be required to be withheld by the Agent or the Borrowers with respect to any payments to be made to the Assignee hereunder, (b) agrees to furnish (if it is organized under the laws of
any jurisdiction other than the United States or any State thereof) to the Agent and the Borrowers prior to the time that the Agent or the Borrowers is required to make any payment of principal, interest, or fees in respect of the interest assigned
hereunder, duplicate executed originals of either U.S. Internal Revenue Service Form W-8ECI, U.S. Internal Revenue Service Form W-8BEN (wherein the Assignee claims entitlement to the benefits of a tax treaty that provides for a complete exemption
from U.S. federal income withholding tax on all payments hereunder), Form W-8IMY and all required supporting documents, or Form W-9 or such other documentation or information prescribed by Requirement of Law (if the Assignee is a “United
States person” within the meaning of Section 7701(a)(30) of the Code) and agrees to provide new Forms W-8ECI, W-8BEN, W-8IMY and all required supporting documents, or W-9 

  

					
		 	3	 	Exhibit F

 
or such other documentation or information prescribed by Requirement of Law upon the expiration of any previously delivered form or comparable statements in accordance with applicable U.S. law
and regulations and amendments thereto, duly executed and completed by the Assignee, and (c) agrees to comply with all applicable U.S. laws and regulations with regard to such withholding tax exemption. 

 

	8.	Representations and Warranties. 

 (a) The Assignor represents and
warrants that (i) it is the legal and beneficial owner of the interest being assigned by it hereunder and that such interest is free and clear of any Lien or other adverse claim; (ii) it is duly organized and existing and it has the full
power and authority to take, and has taken, all action necessary to execute and deliver this Assignment and Acceptance and any other documents required or permitted to be executed or delivered by it in connection with this Assignment and Acceptance
and to fulfill its obligations hereunder; (iii) no notices to, or consents, authorizations, or approvals of, any Person are required (other than any already given or obtained) for its due execution, delivery, and performance of this Assignment
and Acceptance, and apart from any agreements or undertakings or filings required by the Credit Agreement, no further action by, or notice to, or filing with, any Person is required of it for such execution, delivery, or performance; and
(iv) this Assignment and Acceptance has been duly executed and delivered by it and constitutes the legal, valid, and binding obligation of the Assignor, enforceable against the Assignor in accordance with the terms hereof, subject, as to
enforcement, to bankruptcy, insolvency, moratorium, reorganization, and other laws of general application relating to or affecting creditors’ rights and to general equitable principles. 

(b) The Assignor makes no representation or warranty and assumes no responsibility with respect to any statements, warranties,
or representations made in or in connection with the Credit Agreement or the execution, legality, validity, enforceability, genuineness, sufficiency, or value of the Credit Agreement or any other instrument or document furnished pursuant thereto.
The Assignor makes no representation or warranty in connection with, and assumes no responsibility with respect to, the solvency, financial condition, or statements of the Companies, or the performance or observance by any Loan Party of any of its
respective obligations under the Credit Agreement or any other instrument or document furnished in connection therewith. 

(c) The Assignee represents and warrants that (i) it is duly organized and existing and it has full power and authority to
take, and has taken, all action necessary to execute and deliver this Assignment and Acceptance and any other documents required or permitted to be executed or delivered by it in connection with this Assignment and Acceptance, and to fulfill its
obligations hereunder; (ii) no notices to, or consents, authorizations, or approvals of, any Person are required (other than any already given or obtained) for its due execution, delivery, and performance of this Assignment and Acceptance; and
apart from any agreements or undertakings or filings required by the Credit Agreement, no further action by, or notice to, or filing with, any Person is required of it for such execution, delivery, or performance; (iii) this Assignment and
Acceptance has been duly executed and delivered by it and constitutes the legal, valid, and binding obligation of the Assignee, enforceable against the Assignee in accordance with the terms hereof, subject, as to enforcement, to bankruptcy,
insolvency, moratorium, reorganization, and other laws of general application relating to or affecting creditors’ rights and to general equitable principles; and (iv) it is an Eligible Assignee. 

 

	9.	Further Assurances. 

 The Assignor and the Assignee each hereby agree to execute
and deliver such other instruments, and take such other action, as either party may reasonably request in connection with the transactions 

  

					
		 	4	 	Exhibit F

 
contemplated by this Assignment and Acceptance, including the delivery of any notices or other documents or instruments to the Borrowers or the Agent, which may be required in connection with the
assignment and assumption contemplated hereby. 
  

	10.	Miscellaneous. 

 (a) Any amendment or waiver of any provision of
this Assignment and Acceptance shall be in writing and signed by the parties hereto. No failure or delay by either party hereto in exercising any right, power, or privilege hereunder shall operate as a waiver thereof and any waiver of any breach of
the provisions of this Assignment and Acceptance shall be without prejudice to any rights with respect to any other or further breach thereof. 

(b) All payments made hereunder shall be made without any set-off or counterclaim. 

(c) The Assignor and the Assignee shall each pay its own costs and expenses incurred in connection with the negotiation,
preparation, execution, and performance of this Assignment and Acceptance. 
 (d) This Assignment and Acceptance may be
executed in any number of counterparts and all of such counterparts taken together shall be deemed to constitute one and the same instrument. 

(e) THIS ASSIGNMENT AND ACCEPTANCE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK. The
Assignor and the Assignee each irrevocably submits to the non-exclusive jurisdiction of any State or Federal court sitting in Texas over any suit, action, or proceeding arising out of or relating to this Assignment and Acceptance and irrevocably
agrees that all claims in respect of such action or proceeding may be heard and determined in such Texas State or Federal court. Each party to this Assignment and Acceptance hereby irrevocably waives, to the fullest extent it may effectively do so,
the defense of an inconvenient forum to the maintenance of such action or proceeding. 
 (f) THE ASSIGNOR AND THE ASSIGNEE
EACH HEREBY KNOWINGLY, VOLUNTARILY, AND INTENTIONALLY WAIVE ANY RIGHTS THEY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH THIS ASSIGNMENT AND ACCEPTANCE, THE CREDIT AGREEMENT,
ANY RELATED DOCUMENTS AND AGREEMENTS, OR ANY COURSE OF CONDUCT, COURSE OF DEALING, OR STATEMENTS (WHETHER ORAL OR WRITTEN). 

  

					
		 	5	 	Exhibit F

 IN WITNESS WHEREOF, the Assignor and the Assignee have caused this Assignment and Acceptance to be executed and
delivered by their duly authorized officers as of the date first above written. 
  

			
	[ASSIGNOR]
		
	By:	 	  

	Title:	 	  

	Address:	 	  

	
	[ASSIGNEE]
		
	By:	 	  

	Title:	 	  

	Address:	 	  

  

					
		 	6	 	Exhibit F

 SCHEDULE 1 

to 
 ASSIGNMENT AND
ACCEPTANCE 
 NOTICE OF ASSIGNMENT AND ACCEPTANCE 

            , 20__ 

Bank of America, N.A, as Agent (as hereinafter defined) 
 901
Main Street 
 Dallas, Texas 75202 
 Attn: Portfolio Manager

 Re: Westlake Chemical Corporation et al. 
 Ladies and
Gentlemen: 
 We refer to the Third Amended and Restated Credit Agreement dated as of July 17, 2014 (such agreement, as it may be
amended, restated, or otherwise modified from time to time, the “Credit Agreement”) by and among Westlake Chemical Corporation and certain of its domestic subsidiaries listed as Borrowers thereto (collectively, the
“Borrowers”), the Lenders referred to therein, and Bank of America, N.A., as agent for the Lenders (the “Agent”). Terms defined in the Credit Agreement are used herein as therein defined. 

 

	1.	We hereby give the Agent notice of, and request the Agent’s consent to, the assignment by
                     (the “Assignor”) to
                     (the “Assignee”) of         % of the right, title,
and interest of the Assignor in and to the Credit Agreement (including the right, title, and interest of the Assignor in and to the Revolving Commitment of the Assignor to make Revolving Loans, all outstanding Revolving Loans made by the Assignor,
and the Assignor’s participation in the Letters of Credit pursuant to the Assignment and Acceptance Agreement attached hereto (the “Assignment and Acceptance”). We understand and agree that the Assignor’s Revolving
Commitment to make Revolving Loans, as of             , 20    , is $        , the aggregate amount of its
outstanding Revolving Loans is $        , and its participation in Letters of Credit is $        . 

 

	2.	The Assignee agrees that, upon receiving the consent of the Agent to such assignment, the Assignee will be bound by the terms of the Credit Agreement as fully and to the same extent as if the Assignee were the Lender
originally holding such interest in the Credit Agreement. 

  

	3.	The following administrative details apply to the Assignee: 

  

	 	(A)	Notice Address: 

  

	
	Assignee name:                                
	Address:                                     
     
	Attention:                                    
    
	Telephone:
(            )                      
	Telecopier:
(            )                      
	Telex (Answerback):                      

  

					
		 	7	 	Exhibit F

	 	(B)	Payment Instructions: 

  

			
	Account No.:	  	  

	At:	  	  

		  	  

		  	  

	Reference:	  	  

	Attention:	  	  

  

	4.	The Agent is entitled to rely upon the representations, warranties, and covenants of each of the Assignor and Assignee contained in the Assignment and Acceptance. 

  

					
		 	8	 	Exhibit F

 IN WITNESS WHEREOF, the Assignor and the Assignee have caused this Notice of Assignment and
Acceptance to be executed by their respective duly authorized officials, officers, or agents as of the date first above mentioned. 

Very truly yours, 

[NAME OF ASSIGNOR] 

By:                   
                              

Title:                   
                           

[NAME OF ASSIGNEE] 

By:                   
                              

Title:                   
                           
  

					
	[Consented to and]1 Accepted:	 	
		
	 Bank of America, N.A.,
 as
Agent
	 	
			
	By:	 	 	 	
	Name:	 	 	 	
	Title:	 	 	 	
		
	[Consented to:]2	 	
		
	[Westlake Chemical Corporation]	 	
			
	By:	 	 	 	
	Name:	 	 	 	
	Title:	 	 	 	]

  

	1 	To be added only if the consent of the Agent is required by the terms of the Credit Agreement. 

	2 	To be added only if the consent of Westlake and/or other parties (e.g. Letter of Credit Issuer) is required by the terms of the Credit Agreement. 

  

					
		 	9	 	Exhibit F

 EXHIBIT G 

FORM OF COMPLIANCE CERTIFICATE 

(Westlake Chemical Corporation et al.) 

FOR      ENDED             , 

DATE:             , 

 

			
	AGENT:	  	Bank of America, N.A.
		
	BORROWER:	  	Westlake Chemical Corporation and certain of its domestic subsidiaries

 This certificate is delivered under the Third Amended and Restated Credit Agreement, dated as of July 17, 2014 (as
amended, modified, supplemented, or restated from time to time, the “Credit Agreement” ), among Agent, Westlake Chemical Corporation and certain of its domestic subsidiaries listed as Borrowers thereto (collectively, the
“Borrowers” ), and the Lenders party thereto. Capitalized terms used herein and not otherwise defined herein shall have the meaning given to such terms in the Credit Agreement. 

I certify to Agent and Lenders on behalf of the Loan Parties that: 

(a) I am a Responsible Officer of the Loan Parties in the position(s) set forth under my signature below; 

(b) the Financial Statements of the Loan Parties attached to this certificate were prepared in accordance with GAAP, and present fairly in all material
respects the consolidated, and, with respect to annual or quarterly Financial Statements, consolidating, financial condition and results of operations of Westlake and its Subsidiaries as of, and for the
(                     months, or fiscal year) ended on,             ,
         (the “Subject Period” ) [(subject only to normal year-end audit adjustments)]; 

(c) Annex B to this certificate sets forth in reasonable detail the calculation of the Fixed Charge Coverage Ratio at the end of the Subject Period (for the
immediately preceding twelve (12) month period); 
 (d) to the extent any Collateral disposition occurred during the Subject Period, all mandatory
prepayments reductions required pursuant to Section 3.3 have been made; and 
 (e) during the Subject Period, any revisions to
Schedules 6.4, 6.5, 6.23 (to the extent applicable), and 6.24 to the Credit Agreement or any Schedule or Annex to each Collateral Document that was required to be revised and supplied to Agent in accordance
with the terms of the Loan Documents has been so revised and supplied. 
  

			
	WESTLAKE CHEMICAL CORPORATION,
	on its behalf and as agent for the other Loan Parties
		
	By:	 	 
	Name:	 	 
	Title:	 	 

  

					
		 	10	 	Exhibit G

 ANNEX A TO COMPLIANCE CERTIFICATE 

DEVIATIONS FROM LOAN DOCUMENTS/ EVENTS OF DEFAULTS OR DEFAULTS 

(If none, so state.) 

  

					
		 	11	 	Exhibit G

 ANNEX B TO COMPLIANCE CERTIFICATE 

FIXED CHARGE COVERAGE RATIO CALCULATION 

[Form to be Agreed to by Agent and Borrowers] 

  

					
		 	12	 	Exhibit G

 SCHEDULE 1 

BORROWERS 
  

	1.	WESTLAKE VINYLS COMPANY LP 

  

	2.	NORTH AMERICAN PIPE CORPORATION 

  

	3.	WESTECH BUILDING PRODUCTS, INC. 

  

	4.	WESTLAKE CHEMICAL CORPORATION 

  

	5.	WESTLAKE PETROCHEMICALS LLC 

  

	6.	WESTLAKE POLYMERS LLC 

  

	7.	WESTLAKE PVC CORPORATION 

  

	8.	WESTLAKE STYRENE LLC 

  

	9.	WESTLAKE VINYLS, INC. 

  

	10.	WPT LLC 

  

	11.	WESTLAKE LONGVIEW CORPORATION 

  

	12.	WESTLAKE ETHYLENE PIPELINE CORPORATION 

  

	13.	WESTLAKE SUPPLY AND TRADING COMPANY 

  

	14.	NORTH AMERICAN SPECIALTY PRODUCTS LLC, 

  

					
		 		 	Schedule 1

 SCHEDULE 1.2 

LENDERS’ COMMITMENTS 
  

									
	 LENDER
	  	REVOLVING LOAN
COMMITMENT	 	  	
PRO RATA SHARE

(9 DECIMALS)
	 
	 Bank of America, N.A.
	  	$	95,000,000	  	  	 	23.750000000	% 
	 Deutsche Bank AG New York Branch
	  	$	55,000,000	  	  	 	13.750000000	% 
	 JPMorgan Chase Bank, N.A.
	  	$	55,000,000	  	  	 	13.750000000	% 
	 Wells Fargo Capital Finance, LLC
	  	$	55,000,000	  	  	 	13.750000000	% 
	 Barclays Bank PLC
	  	$	25,000,000	  	  	 	6.250000000	% 
	 Branch Banking and Trust Company
	  	$	25,000,000	  	  	 	6.250000000	% 
	 BNP Paribas
	  	$	25,000,000	  	  	 	6.250000000	% 
	 UBS AG, Stamford Branch
	  	$	25,000,000	  	  	 	6.250000000	% 
	 Morgan Stanley Bank, N.A.
	  	$	20,000,000	  	  	 	5.000000000	% 
	 PNC Bank, National Association
	  	$	20,000,000	  	  	 	5.000000000	% 
		  	  
	  
	 	  	  
	  
	 
			
	 TOTAL
	  	$	400,000,000	  	  	 	100.000000000	% 
		  	  
	  
	 	  	  
	  
	 

  
 Schedule 1.2 

 SCHEDULE 6.4 

PRIOR CORPORATE NAMES 
  

			
	 CURRENT NAME
	  	 FORMER OR OTHER NAMES DURING
PAST 5 YEARS

	North American Pipe Corporation	  	 North American Pipe
 Van Buren Pipe
Corporation
 North American Bristol Corporation

	Westech Building Products, Inc.	  	 North American Profiles, Inc.
 Westech Profiles
Limited

	Westlake Petrochemicals LLC	  	Westlake Petrochemicals LP
	Westlake Polymers LLC	  	Westlake Polymers LP
	Westlake Styrene LLC	  	Westlake Styrene LP
	Westlake Vinyls Company LP	  	 Geismar Vinyls Company LP
 Geismar Vinyls
LP

	Westlake Supply and Trading Company	  	Westlake International Corporation
	WPT LLC	  	WPT LP
	Westlake Longview Corporation	  	Westlake NG II Corporation
	Westlake Geismar Power Company LLC	  	Westlake NG III Corporation

  
 Schedule 6.4 

 SCHEDULE 6.5 

SUBSIDIARIES AND AFFILIATES 

Subsidiaries 
 See attached organizational chart.

 Minority interests in Affiliated entities are set forth in Schedule 7.10 

Affiliates 
  

			
	Cypress Interstate Pipeline LLC	  	50% membership interest owned by
		  	Westlake Pipeline Investments LLC
		
	Warwick Partners I LLC	  	50% ownership interest owned by Westlake NG IV Corporation

  

			
	Restricted Subsidiaries that are not Loan Parties:	 	Each Subsidiary on the attached organizational chart other than the Loan Parties and the Unrestricted Subsidiaries.
		
	Material Subsidiaries:	 	 As of closing, each Borrower (other than Westlake) and each Guarantor other than:

Geismar Holdings, Inc.
 Westlake Chemical Investments, Inc.

Westlake Ethylene Pipeline Corporation
 Westlake Geismar Power
Company LLC
 Westlake Management Services, Inc.
 Westlake NG I
Corporation
 Westlake NG IV Corporation
 Westlake Pipeline
Investments LLC
 Westlake Resources Corporation
 Westlake Vinyl
Corporation
 Westlake NG V Corporation
 Westlake Olefins
Corporation

		
	Excluded Subsidiaries:	 	None
		
	Unrestricted Subsidiaries:	 	As of closing, unless and until designated a Restricted Subsidiary in accordance with the terms of this Agreement, (a) Westlake International Services Corporation, Westlake Chemical (Asia) Inc., Westlake Chemical (China)
Corporation, Westlake International II LLC, Westlake Chemical Partners GP LLC, Westlake Chemical OpCo GP LLC and Westlake Chemical Partners LP, (b) any Foreign Subsidiary of Westlake or any other Loan Party, (c) any Project Finance Subsidiary, (d)
any JV Subsidiary, (e) any Subsidiary of an Unrestricted Subsidiary (other than Westlake Chemical OpCo LP, and any Subsidiary thereof).

  
 Schedule 6.5 

 

 

  
 Schedule 6.5 

 SCHEDULE 6.9 

REGISTERED PATENTS 
 * Note
Restrictions: Patents notated are subject to one or more of 3 license agreements relating to ENERGX® technology 

The ENERGX® technology license agreements: 
 1. Chevron
Chemical Corporation License effective 9/23/1999, which was an up front fee and royalty payment for the use of the ENERGX® technology 
 2. BP License,
effective 4/17/2001, which grants a license for BP to use the ENERGX® technology themselves and also provides provisions for sharing royalties if they license to others 

3. Hanwha Chemical Corporation License, effective 10/22/2001, which grants a license for an up front fee and royalty payment for the use of the ENERGX®
technology 
  

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	North American Specialty Products	  	US	  		  	12/977,307	  	8,459,698	  	Certa-Set 3/4” Riser Cap (utility)
						
	North American Specialty Products	  	US	  		  	29/382,099	  	D 673,244 S	  	Certa-Set 3/4” Riser Cap (design)
						
	North American Specialty Products	  	US	  		  	10/781,005	  	7,108,295	  	Filament-Wound Composite Coupling
						
	North American Specialty Products	  	US	  		  	09/432,037	  	6,302,445	  	Irrigation Pipe System (Clare
						
	North American Specialty Products	  	US	  		  	09/160,026	  	6,086,297	  	Apparatus for Forming Grooves
						
	North American Specialty Products	  	US	  		  	13/891,561	  		  	RISER CAP AND IRRIGATION PIPING SYSTEM USING SAME (Certa-Set)
						
	North American Specialty Products	  	US	  		  	13/954,315	  		  	Leave-In-Place Form for Concrete
						
	North American Specialty Products	  	US	  		  	14/015,224	  		  	Flush Joint Pipe (install method)(Straightshot)
						
	North American Specialty Products	  	CA	  		  	2,822,210	  		  	Leave-In-Place Form for Concrete
						
	North American Specialty Products	  	US	  		  	11/174,203	  	8,011,144	  	System for Forming and Insulating Concrete Slab Edges

  

					
		  	1	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	North American Specialty Products	  	US	  		  	14/015,231	  		  	Flush Joint Pipe (Pipe Assembly)(Straightshot)
						
	North American Specialty Products	  	US	  		  	14/015,235	  		  	Flush Joint Pipe (Pipe)(Straightshot)
						
	Westech Building Products, Inc.	  	US	  		  	08/766,281	  	5,758,467	  	INTER-CONNECTABLE, MODULAR, DECK MEMBER
						
	Westech Building Products, Inc.	  	US	  		  	10/241,642	  	6,739,1006	  	Reversible Deck Boards (Curatolo)
						
	Westech Building Products, Inc.	  	US	  		  	29/482,877	  		  	Vinyl Railing System (e-Rail)
						
	Westech Building Products, Inc.	  	CA	  		  	To be assigned	  		  	Vinyl Railing System (e-Rail)
						
	Westlake Vinyls Corporation	  	US	  		  	08/355,918	  	5,507,921	  	METHOD FOR QUENCHING A GAS STREAM IN THE PRODUCTION OF VINYL CHLORIDE MONOMER
						
	Westlake Longview Corporation	  	WO	  		  	US2013/071568	  		  	Wall Baffles
						
	Westlake Longview Corporation	  	WO	  		  	US2011/060582	  		  	Hexane Wash
						
	Westlake Longview Corporation	  	WO	  		  	US2009/032082	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	WO	  		  	US2009/032077	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	WO	  		  	US2007/024527	  		  	High-Pressure Separator
						
	Westlake Longview Corporation	  	WO	  		  	US2007/024502	  		  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	WO	  		  	US2007/015398	  		  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	WO	  		  	US2007/011417	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization
						
	Westlake Longview Corporation	  	WO	  		  	US2007/009409	  		  	Simplified Process to Prepare Polyolefins from Saturated Hydrocarbons

  

					
		  	2	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	WO	  		  	US2005/37891	  		  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	WO	  		  	US2004/037657	  		  	Hot Melt Adhesive with Improved Performance Window
						
	Westlake Longview Corporation	  	WO	  		  	US2004/025418	  		  	Polymerization Process and Associated Apparatus
						
	Westlake Longview Corporation	  	WO	  		  	US2003/001576	  		  	Process for the Polymerization of Ethylene and Interpolymers Thereof
						
	Westlake Longview Corporation	  	WO	  		  	US2002/021657	  		  	Process for the Polymerization of Ethylene and Interpolymers Thereof
						
	Westlake Longview Corporation	  	WO	  		  	US2002/021656	  		  	Process for the Polymerization of Ethylene and Interpolymers Thereof
						
	Westlake Longview Corporation	  	WO	  		  	US2002/021655	  		  	Process for the Polymerization of Ethylene and Interpolymers Thereof
						
	Westlake Vinyl Corporation	  	WO	  		  	US2009/004535	  		  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Longview Corporation	  	US	  	*Note 1	  	09/627,501	  	6,359,050	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	US	  	*Note 10	  	09/145,452	  	6,197,887	  	BLEND OF LOW VISCOSITY AMORPHOUS POLYOLEFIN AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  	*Note 11	  	09/145,629	  	6,070,394	  	HIGH SPEED, HIGH CLING, LOW NOISE STRETCH WRAPPING PROCESS
						
	Westlake Longview Corporation	  	US	  	*Note 12	  	09/145,684	  	6,153,702	  	BLENDS OF HIGHLY AMORPHOUS POLYPROPYLENE COPOLYMERS AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  	*Note 13	  	09/251,356	  	6,228,957	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	US	  	*Note 14	  	09/251,811	  	6,191,239	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	US	  	*Note 15	  	09/251,969	  	6,271,321	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	US	  	*Note 16	  	09/386,545	  	6,417,301	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY

  

					
		  	3	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

	Westlake Longview Corporation	  	US	  	*Note 17	  	09/387,365	  	6,191,238	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	US	  	*Note 18	  	09/387,601	  	6,291,613	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	US	  	*Note 19	  	09/387,667	  	6,300.432	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  	*Note 2	  	09/818,327	  	6,417,296	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  	*Note 3	  	09/912,063	  	6,534,613	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	US	  	*Note 4	  	09/917,307	  	6,608,152	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	US	  	*Note 5	  	10/177,979	  	6,765,048	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	US	  	*Note 6	  	08/724,805	  	5,969,061	  	PROCESS FOR THE REDUCTION OF POLYMERIC FINES
						
	Westlake Longview Corporation	  	US	  	*Note 7	  	09/104,726	  	6,147,179	  	LOW VISCOSITY AMORPHOUS PROPYLENE-ETHYLENE COPOLYMER AS LLDPE BLOWN STRETCH FILM ADDITIVE
						
	Westlake Longview Corporation	  	US	  	*Note 8	  	09/132,203	  	6,130,293	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY
						
	Westlake Longview Corporation	  	US	  	*Note 9	  	09/145,451	  	6,204,33	  	BLENDS OF AMORPHOUS POLYOLEFINS AND LINEAR ULTRA LOW DENSITY POLYETHYLENES
						
	Westlake Longview Corporation	  	US	  		  	12/327,159	  	8,118,173	  	Stream Trap Assembly
						
	Westlake Longview Corporation	  	US	  		  	12/038,549	  	8,129,482	  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	US	  		  	12/038,601	  	8,124,697	  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	US	  		  	09/563,466	  	6,359,083	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	US	  		  	09/636,485	  	6,515,093	  	BLENDS OF HIGHLY AMORPHOUS POLYPROPYLENE COPOLYMERS AND LINEAR LOW DENSITY POLYETHYLENE

  

					
		  	4	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

	Westlake Longview Corporation	  	US	  		  	09/679,999	  	6,608,156	  	PROCESS FOR PREPARING COPOLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COMPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS RESULTING
	Westlake Longview Corporation	  	US	  		  	09/680,000	  	6,472,491	  	PROCESS FOR PREPARING POLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS FROM THE PRO
						
	Westlake Longview Corporation	  	US	  		  	09/689,165	  	6,492,032	  	MULTI-COMPONENT BLENDS FOR BRIGHTENING POLYOLEFINS
						
	Westlake Longview Corporation	  	US	  		  	09/698,749	  	6,433,133	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS
						
	Westlake Longview Corporation	  	US	  		  	09/717,672	  	6,509,106	  	IMPROVED BLENDS CONTAINING LINEAR LOW DENSITY POLYETHYLENE, HIGH DENSITY POLYETHYLENE, AND LOW DENSITY POLYETHYLENE FOR EXTRUSION COATING
						
	Westlake Longview Corporation	  	US	  		  	10/027556	  	6,649,694	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	US	  		  	09/753,482	  	6,696,380	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	US	  		  	09/753,699	  	6,465,383	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	US	  		  	09/789,024	  	6,500,901	  	BLENDS OF AMORPHOUS POLYOLEFINS AND LINEAR ULTRA LOW DENSITY POLYETHYLENES
						
	Westlake Longview Corporation	  	US	  		  	09/855,829	  	6,586,538	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	US	  		  	09/912,141	  	6,635,726	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	US	  		  	09/912,148	  	6,660,817	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	US	  		  	09/912,171	  	6,646,073	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	US	  		  	10/118,739	  	6,827,807	  	PROCESS FOR PRODUCING MULTILAYER STRUCTURES HAVING A LAYER FORMED FROM A BLEND OF AN ETHYLENE-ALPHA-OLEFIN INTERPOLYMER AND AN ETHYLENE-ALKYL ACRYLATE INTERPOLYMER
						
	Westlake Longview Corporation	  	US	  		  	10/134,940	  	6,673,892	  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS

  

					
		  	5	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	US	  		  	10/191,096	  	6,677,266	  	PROCESS FOR THE POLYMERIZATION OF OLEFINS
						
	Westlake Longview Corporation	  	US	  		  	10/217,680	  	6,677,410	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	US	  		  	10/279,646	  	6,759,492	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	US	  		  	10/341,855	  	6,608,157	  	PROCESS FOR PREPARING COPOLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COMPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS RESULTING
						
	Westlake Longview Corporation	  	US	  		  	10/465,194	  	7,652,113	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	US	  		  	10/912,918	  	8,063,158	  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	US	  		  	11/490,216	  	7,718,139	  	REDUCED EQUIPMENT FOULING IN THE GAS-PHASE, FLUID BED POLYMERIZATION PROCESS OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	US	  		  	11/585,050	  	7,446,156	  	SWIRLING FLUIDIZED-BED REACTORS FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	US	  		  	08/462,713	  	5,654,377	  	ETHYLENE-ALKYL ACRYLATE COPOLYMERS, PROCESSES FOR PREPARING SAME AND HIGH CLARITY FILMS MADE THEREFROM
						
	Westlake Longview Corporation	  	US	  		  	08/531,989	  	5,667,575	  	PROCESS FOR REDUCING THE COLOR OF AQUEOUS EMULSIONS OF FUNCTIONALIZED POLYOLEFINS
						
	Westlake Longview Corporation	  	US	  		  	08/579,682	  	5,750,269	  	REMOVABLE ANTI-GRAFFITI COATING
						
	Westlake Longview Corporation	  	US	  		  	08/951,597	  	6,111,036	  	METHOD FOR IMPROVED COOLING OF FLUID BED POLYMER REACTOR
						
	Westlake Longview Corporation	  	US	  		  	09/023,440	  	6,020,434	  	SYNERGISTIC BLENDS OF POLYETHYLENES EXHIBITING ENHANCED GLOSS PROPERTIES
						
	Westlake Longview Corporation	  	US	  		  	09/048,455	  	6,110,599	  	BLENDS OF LINEAR LOW DENSITY POLYETHYLENE AND POLYETHYLENE HOMOPOLYMERS FOR EXTRUSION COATING
						
	Westlake Longview Corporation	  	US	  		  	09/053,924	  	6,100,414	  	CYCLOPENTADIENYL TRANSITION METAL CATALYST AND PROCESS FOR THE PRODUCTION THEREOF

  

					
		  	6	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	US	  		  	09/078,229	  	6,060,584	  	PROCESS TO THERMOMECHANICALLY DEGRADE POLYPROPYLENE USING A TWIN-SCREW EXTRUDER
						
	Westlake Longview Corporation	  	US	  		  	09/088,904	  	6,174,612	  	POLYETHYLENES WITH ENHANCED HEAT SEAL PROPERTIES
						
	Westlake Longview Corporation	  	US	  		  	09/252,599	  	6,291,048	  	POLYMER BASED CARPET
						
	Westlake Longview Corporation	  	US	  		  	09/387,363	  	6,417,298	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	US	  		  	09/387,364	  	6,417,299	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	US	  		  	09/387,366	  	6,187,879	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	US	  		  	09/387,599	  	6,313,236	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  		  	09/387,600	  	6,288,181	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	US	  		  	10/715157	  	7,223,814	  	HOT MELT ADHESIVE WITH IMPROVED PERFORMANCE WINDOW
						
	Westlake Longview Corporation	  	US	  		  	11/249573	  	7,253,239	  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	US	  		  	11/446,252	  	7,439,286	  	Modified Asphalt Compositions
						
	Westlake Longview Corporation	  	US	  		  	11/490,216	  	7,718,130	  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	US	  		  	11/841,666	  	7,893,180	  	Process for the Polymerization of Olefins; Novel Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	US	  		  	11/998,414	  	7,740,674	  	High-Pressure Separator
						
	Westlake Longview Corporation	  	US	  		  	11/994,415	  	7,939,025	  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	US	  		  	12/323,638	  	RE41,167	  	Reissue - Modified Asphalt Compositions

  

					
		  	7	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	US	  		  	12/750,858	  	7,977,436	  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	US	  		  	12/987,951	  	8,198,384	  	Method For Preventing or Reducing Clogging of a Fines Ejector (Hexane Wash)
						
	Westlake Longview Corporation	  	US	  		  	13/690,535	  	8,653,207	  	Wall Baffles
						
	Westlake Longview Corporation	  	TW	  		  	102143911	  		  	Wall Baffles
						
	Westlake Longview Corporation	  	KR	  		  	2000/7007147	  	00610968	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	KR	  		  	2001/7001720	  	00610964	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY
						
	Westlake Longview Corporation	  	KR	  		  	2001/7004462	  	00626470	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	KR	  		  	2001/7004463	  	00549885	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	KR	  		  	2001/7005185	  	00610970	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	KR	  		  	2001/7011099	  	00582312	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	KR	  		  	2001/7011101	  	582313	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	KR	  		  	2002/7002631	  	626476	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	KR	  		  	2002/7002635	  	626900	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	KR	  		  	2002/7002636	  	610969	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	KR	  		  	2002/7008997	  	00737015	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	KR	  		  	2002/7009004	  	0037016	  	CATALYST FOR OLEFIN POLYMERIZATION

  

					
		  	8	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	KR	  		  	2002/7014610	  	0785538	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	KR	  		  	2004/7000971	  	0994628	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	 KR
	  		  	2004/7017353	  	989198	  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS
						
	Westlake Longview Corporation	  	KR	  		  	2006/7002575	  	1,148,663	  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	KR	  		  	2007-7012033	  	1,242,220	  	Method for Preventing or Inhibiting Fouling in a Gas-Phase Polyolefin Polymerization Process
						
	Westlake Longview Corporation	  	KR	  		  	2008-7025126	  		  	SIMPLIFIED PROCESS TO PREPARE POLYOLEFINS FROM SATURATED HYDROCARBONS
						
	Westlake Longview Corporation	  	KR	  		  	2008-7027559	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization
						
	Westlake Longview Corporation	  	KR	  		  	2009-7001043	  		  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	KR	  		  	2009-7011036	  		  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	KR	  		  	2009-7010965	  		  	High-Pressure Separator
						
	Westlake Longview Corporation	  	KR	  		  	2010-7018939	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	KR	  		  	2010-7018942	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	KR	  		  	2013-701747.0	  		  	Hexane Wash
						
	Westlake Longview Corporation	  	JP	  		  	2000-578358	  	4,261,064	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	JP	  		  	2000-602689	  	4,751,314	  	Process for Producing Polyethylene
						
	Westlake Longview Corporation	  	JP	  		  	2000-608665	  	4,699,613	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE

  

					
		  	9	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	JP	  		  	2001-538984	  	5,399,054	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS
						
	Westlake Longview Corporation	  	JP	  		  	2001-551110	  	4,870,891	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	JP	  		  	2001-551112	  	4,856,342	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	JP	  		  	2001-580195	  	4,828,767	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	JP	  		  	2002-516000	  	5,284,556	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	JP	  		  	2002-516001	  	5,117,662	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	JP	  		  	2002-534412	  	2004-511815	  	MULTI-COMPONENT BLENDS FOR BRIGHTENING POLYOLEFINS
						
	Westlake Longview Corporation	  	JP	  		  	2003-515570	  	4,426,289	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	JP	  		  	2004-501467	  	4,331,674	  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS
						
	Westlake Longview Corporation	  	JP	  		  	2006-522747	  	4,755,904	  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	JP	  		  	2006-541259	  	5,148,877	  	Hot Melt Adhesives with Improved Performance Window
						
	Westlake Longview Corporation	  	JP	  		  	2007-539004	  	5,090,919	  	Method for Preventing or Inhibiting Fouling in a Gas-Phase Polyolefin Polymerization Process
						
	Westlake Longview Corporation	  	JP	  		  	2009-506467	  	4,827,962	  	Process for Producing Polyethylene
						
	Westlake Longview Corporation	  	JP	  		  	2009-506549	  	5,192,483	  	SIMPLIFIED PROCESS TO PREPARE POLYOLEFINS FROM SATURATED HYDROCARBONS
						
	Westlake Longview Corporation	  	JP	  		  	2009-510992	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization

  

					
		  	10	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	JP	  		  	2009-520748	  	5,437,800	  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	JP	  		  	2009-539305	  		  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	JP	  		  	2010-191443	  		  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	JP	  		  	2010-222301	  		  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	JP	  		  	2010-548768	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	JP	  		  	2010-548769	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	JP	  		  	2011-133385	  		  	Catalyst for Olefin Polymerization
						
	Westlake Longview Corporation	  	JP	  		  	2012-205791	  		  	Process for the Polymerization of Alpha-Olefins
						
	Westlake Longview Corporation	  	JP	  		  	2013-549404	  		  	Hexane Wash
						
	Westlake Longview Corporation	  	GB	  		  	01 925 048.9	  	1 278 783	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	GB	  		  	04 810 756.9	  	1 685 207	  	HOT MELT ADHESIVE WITH IMPROVED PERFORMANCE WINDOW
						
	Westlake Longview Corporation	  	GB	  		  	05 000 815.0	  	1 522 544	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	GB	  		  	02 752 225.9	  	1 417 241	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	GB	  		  	03 809 485.0	  	1 554 318	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	GB	  		  	00978754.0	  	1237947	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS

  

					
		  	11	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

	Westlake Longview Corporation	  	GB	  		  	01121666.0	  	1195392	  	PROCESS FOR PREPARING POLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS FROM THE PRO
						
	Westlake Longview Corporation	  	GB	  		  	01979465.0	  	1325067	  	MULTI-COMPONENT BLENDS FOR BRIGHTENING POLYOLEFINS
						
	Westlake Longview Corporation	  	GB	  		  	02797440.1	  	1458775	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	GB	  		  	94901681.0	  	672083	  	POLYMER BLENDS CONTAINING PROPYLENE-ETHYLENE COPOLYMER AND ETHYLENE-ALKYL ACRYLATE COPOLYMER
						
	Westlake Longview Corporation	  	GB	  		  	96936494.2	  	0856012	  	PROCESS FOR THE REDUCTION OF POLYMERIC FINES
						
	Westlake Longview Corporation	  	GB	  		  	97912853.5	  	0932627	  	METHOD FOR IMPROVED COOLING OF FLUID BED POLYMER REACTOR
						
	Westlake Longview Corporation	  	GB	  		  	98930495.1	  	991716	  	LOW VISCOSITY AMORPHOUS PROPYLENE-ETHYLENE COPOLYMER AS LLDPE BLOWN STRETCH FILM ADDITIVE
						
	Westlake Longview Corporation	  	GB	  		  	98946031.6	  	1023364	  	BLENDS OF AMORPHOUS POLYOLEFINS AND LINEAR ULTRA LOW DENSITY POLYETHYLENES
						
	Westlake Longview Corporation	  	GB	  		  	98946032.4	  	1019448	  	BLEND OF LOW VISCOSITY AMORPHOUS POLYOLEFIN AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	98947026.5	  	1023343	  	BLENDS OF HIGHLY AMORPHOUS POLYPROPYLENE COPOLYMERS AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	99909825.4	  	1159311	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	GB	  		  	99911103.2	  	1159314	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	GB	  		  	99911105.7	  	1159315	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	GB	  		  	99911106.5	  	1159316	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	GB	  		  	99937498.6	  	1115775	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY

  

					
		  	12	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	GB	  		  	99951735.2	  	1183284	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	GB	  		  	99951737.8	  	1208121	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	GB	  		  	99951975.4	  	1153048	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	GB	  		  	99952018.2	  	1192196	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	GB	  		  	99953160.1	  	1208122	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	GB	  		  	99953163.5	  	1187857	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	GB	  		  	99954897.7	  	1171484	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	99954898.5	  	1171485	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	99954919.9	  	1165634	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	99954975.1	  	1208123	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	GB	  		  	99954976.9	  	1194459	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	GB	  		  	99954979.3	  	1047717	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	GB	  		  	99973800.8	  	1169360	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	GB	  		  	10 010 551.9	  	2 277 923	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	GB	  		  	10 010 552.7	  	2 277 924	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	GB	  		  	10 010 561.8	  	2 287 211	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom

  

					
		  	13	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	GB	  		  	10 010 562.6	  	2 275 456	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	FR	  		  	01 925 048.9	  	1 278 783	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	FR	  		  	04 810 756.9	  	1 685 207	  	HOT MELT ADHESIVE WITH IMPROVED PERFORMANCE WINDOW
						
	Westlake Longview Corporation	  	FR	  		  	05 000 815.0	  	1 522 544	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	FR	  		  	02 752 225.9	  	1 417 241	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	FR	  		  	03 809 485.0	  	1 554 318	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	FR	  		  	00978754.0	  	1 237 947	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS
						
	Westlake Longview Corporation	  	FR	  		  	01121666.0	  	1 195 392	  	PROCESS FOR PREPARING POLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS FROM THE PRO
	Westlake Longview Corporation	  	FR	  		  	01121667.8	  	1 195 393	  	PROCESS FOR PREPARING COPOLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COMPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS RESULTING
						
	Westlake Longview Corporation	  	FR	  		  	01 959 007.4	  	1 307 508	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	FR	  		  	1979465	  	1 325 067	  	MULTI-COMPONENT BLENDS FOR BRIGHTENING POLYOLEFINS
						
	Westlake Longview Corporation	  	FR	  		  	02797440.1	  	1 458 775	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	FR	  		  	94901681.0	  	0000672083	  	POLYMER BLENDS CONTAINING PROPYLENE-ETHYLENE COPOLYMER AND ETHYLENE-ALKYL ACRYLATE COPOLYMER
						
	Westlake Longview Corporation	  	FR	  		  	96936494.2	  	0000856012	  	PROCESS FOR THE REDUCTION OF POLYMERIC FINES
						
	Westlake Longview Corporation	  	FR	  		  	97912853.5	  	0000932627	  	METHOD FOR IMPROVED COOLING OF FLUID BED POLYMER REACTOR

  

					
		  	14	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	FR	  		  	98930495.1	  	0000991716	  	LOW VISCOSITY AMORPHOUS PROPYLENE-ETHYLENE COPOLYMER AS LLDPE BLOWN STRETCH FILM ADDITIVE
						
	Westlake Longview Corporation	  	FR	  		  	98946031.6	  	1 023 364	  	BLENDS OF AMORPHOUS POLYOLEFINS AND LINEAR ULTRA LOW DENSITY POLYETHYLENES
						
	Westlake Longview Corporation	  	FR	  		  	98946032.4	  	1 019 448	  	BLEND OF LOW VISCOSITY AMORPHOUS POLYOLEFIN AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	FR	  		  	98947026.5	  	1 023 343	  	BLENDS OF HIGHLY AMORPHOUS POLYPROPYLENE COPOLYMERS AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	FR	  		  	99909825.4	  	1 159 311	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	FR	  		  	99911103.2	  	1 159 314	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	FR	  		  	99911105.7	  	1 159 315	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	FR	  		  	99911106.5	  	1 159 316	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	FR	  		  	99937498.6	  	1 115 775	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY
						
	Westlake Longview Corporation	  	FR	  		  	99951735.2	  	1 183 284	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	FR	  		  	99951737.8	  	1 208 121	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	FR	  		  	99951975.4	  	1 153 048	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	FR	  		  	99952018.2	  	1 192 196	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	FR	  		  	99953160.1	  	1 208 122	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	FR	  		  	99953163.5	  	1 187 857	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	FR	  		  	99954897.7	  	1 171 484	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE

  

					
		  	15	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	FR	  		  	99954898.5	  	1 171 485	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	FR	  		  	99954919.9	  	1 165 634	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	FR	  		  	99954975.1	  	1 208 123	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	FR	  		  	99954976.9	  	1 194 459	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	FR	  		  	99954979.3	  	1 047 717	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	FR	  		  	99973800.8	  	1 169 360	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	FR	  		  	10 010 551.9	  	2 277 923	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	FR	  		  	10 010 552.7	  	2 277 924	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	FR	  		  	10 010 561.8	  	2 287 211	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	FR	  		  	10 010 562.6	  	2 275 456	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	EP	  		  	09 714 652.6	  	2 247 625	  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	EP	  		  	09 715 821.6	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	EP	  		  	07 862 310.5	  		  	High-Pressure Separator
						
	Westlake Longview Corporation	  	EP	  		  	07 862 293.3	  		  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	EP	  		  	07 796 660.4	  	2 043 722	  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	EP	  		  	07 794 790.1	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization

  

					
		  	16	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	EP	  		  	07 755 615.7	  	2 007 821	  	SIMPLIFIED PROCESS TO PREPARE POLYOLEFINS FROM SATURATED HYDROCARBONS
						
	Westlake Longview Corporation	  	EP	  		  	01 121 667.8	  	1 195 393	  	PROCESS FOR PREPARING COPOLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COMPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS RESULTING
						
	Westlake Longview Corporation	  	EP	  		  	01 925 048.9	  	1 278 783	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	EP	  		  	01 959 007.4	  	1 307 508	  	POLYETHYLENE RESIN FOR MICROPOROUS FILM
						
	Westlake Longview Corporation	  	EP	  		  	02 749 872.4	  		  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	EP	  		  	02 752 225.9	  	1 417 241	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	EP	  		  	02 752 226.7	  		  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	EP	  		  	03 726 418.1	  		  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS
						
	Westlake Longview Corporation	  	EP	  		  	03 809 485.0	  	1 554 318	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	EP	  		  	04 780 282.2	  		  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	EP	  		  	04 810 756.9	  	1 685 207	  	HOT MELT ADHESIVE WITH IMPROVED PERFORMANCE WINDOW
						
	Westlake Longview Corporation	  	EP	  		  	05 000 815.0	  	1 522 544	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	EP	  		  	05 815 620.9	  	1 819 740	  	Method for Preventing or Inhibiting Fouling in a Gas-Phase Polyolefin Polymerization Process
						
	Westlake Longview Corporation	  	EP	  		  	07 008 240.9	  	1 860 127	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	EP	  		  	10 010 551.9	  	2 277 923	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom

  

					
		  	17	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	EP	  		  	10 010 552.7	  	2 277 924	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	EP	  		  	10 010 561.8	  	2 287 211	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	EP	  		  	10 010 562.6	  	2 275 456	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	EP	  		  	02797440.1	  	1 458 775	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	EP	  		  	99954975.1	  	1 208 123	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	EP	  		  	99954976.9	  	1 194 459	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	EP	  		  	99 909 825.4	  	1 159 311	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	EP	  		  	99 911 103.2	  	1 159 314	  	Process for Producing Polyethylene
						
	Westlake Longview Corporation	  	EP	  		  	99 911 106.5	  	1 159 316	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	EP	  		  	99911105.7	  	1 159 315	  	Process for Producing Polyethylene
						
	Westlake Longview Corporation	  	EP	  		  	99913973.6	  	1 066 302	  	Cyclopentadienyl Transition Metal Compounds, Useful as Polymerization Catalysts
						
	Westlake Longview Corporation	  	EP	  		  	99951737.8	  	1 208 121	  	Process for Producing Polyolefins
						
	Westlake Longview Corporation	  	EP	  		  	99951975.4	  	1 153 048	  	Process for the Polymerization of Olefins
						
	Westlake Longview Corporation	  	EP	  		  	99953160.1	  	1 208 122	  	Process for Producing Polyolefins
						
	Westlake Longview Corporation	  	EP	  		  	99954897.7	  	1 171 484	  	Process for Producing Polyolefins
						
	Westlake Longview Corporation	  	EP	  		  	99954979.3	  	1 047 717	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS

  

					
		  	18	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	EP	  		  	99973800.8	  	1 169 360	  	Process for Producing Polyolefins
						
	Westlake Longview Corporation	  	DE	  		  	01 925 048.9	  	601 32 884.1	  	GAS-SLURRY OLEFIN POLYMERIZATION PROCESS AND APPARATUS
						
	Westlake Longview Corporation	  	DE	  		  	04 810 756.9	  	60 2004 020 914.7	  	HOT MELT ADHESIVE WITH IMPROVED PERFORMANCE WINDOW
						
	Westlake Longview Corporation	  	DE	  		  	05 000 815.0	  	699 38 367.6	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	DE	  		  	02 752 225.9	  	602 39 066.4-08	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	DE	  		  	03 809 485.0	  	602 35 481.5-08	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	DE	  		  	00 978 754.0	  	600 23 546.7	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS
						
	Westlake Longview Corporation	  	DE	  		  	01 121 666.0	  	601 21 522.2	  	PROCESS FOR PREPARING POLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS FROM THE PRO
	Westlake Longview Corporation	  	DE	  		  	01 121 667.8	  	601 41 735.6	  	PROCESS FOR PREPARING COPOLYMERS CONTAINING FUNCTIONALIZED OLEFIN COMONOMERS SUCH AS COMPOLYMERS OF 3,4-DIACETOXY-1-BUTENE WITH ETHYLENE, OPTIONALLY WITH CARBON MONOXIDE MONOMER AND POLYMERS RESULTING
						
	Westlake Longview Corporation	  	DE	  		  	01 979 465.0	  	601 22 913.4	  	MULTI-COMPONENT BLENDS FOR BRIGHTENING POLYOLEFINS
						
	Westlake Longview Corporation	  	DE	  		  	02 797 440.1	  	602 13 862.0	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	DE	  		  	949 01 681.0	  	693 16 772.6	  	POLYMER BLENDS CONTAINING PROPYLENE-ETHYLENE COPOLYMER AND ETHYLENE-ALKYL ACRYLATE COPOLYMER
						
	Westlake Longview Corporation	  	DE	  		  	969 36 494.2	  	696 20 431.2	  	PROCESS FOR THE REDUCTION OF POLYMERIC FINES
						
	Westlake Longview Corporation	  	DE	  		  	979 12 853.5	  	697 03 846.7	  	METHOD FOR IMPROVED COOLING OF FLUID BED POLYMER REACTOR
						
	Westlake Longview Corporation	  	DE	  		  	989 30 495.1	  	698 21 358.0	  	LOW VISCOSITY AMORPHOUS PROPYLENE-ETHYLENE COPOLYMER AS LLDPE BLOWN STRETCH FILM ADDITIVE

  

					
		  	19	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	DE	  		  	989 46 031.6	  	698 35 226.2	  	BLENDS OF AMORPHOUS POLYOLEFINS AND LINEAR ULTRA LOW DENSITY POLYETHYLENES
						
	Westlake Longview Corporation	  	DE	  		  	989 46 032.4	  	698 35 220.3	  	BLEND OF LOW VISCOSITY AMORPHOUS POLYOLEFIN AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	DE	  		  	989 47 026.5	  	698 27 967.0	  	BLENDS OF HIGHLY AMORPHOUS POLYPROPYLENE COPOLYMERS AND LINEAR LOW DENSITY POLYETHYLENE
						
	Westlake Longview Corporation	  	DE	  		  	999 09 825.4	  	699 08 657.4	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	DE	  		  	999 11 103.2	  	699 19 222.6	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	DE	  		  	999 11 105.7	  	699 33 139.0	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	DE	  		  	999 11 106.5	  	699 28 132.6	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	DE	  		  	999 37 498.6	  	699 33 782.8	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY
						
	Westlake Longview Corporation	  	DE	  		  	999 51 735.2	  	699 25 040.4	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	DE	  		  	999 51 737.8	  	699 19 412.1	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	DE	  		  	999 51 975.4	  	699 26 083.3	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	DE	  		  	999 52 018.2	  	699 26 150.3	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	DE	  		  	999 53 160.1	  	699 22 551.5	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	DE	  		  	999 53 163.5	  	699 14 381.0	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	DE	  		  	999 54 897.7	  	699 34 334.8	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	DE	  		  	999 54 898.5	  	699 34 258.9	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE

  

					
		  	20	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application

Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	DE	  		  	999 54 919.9	  	699 19 408.3	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	DE	  		  	999 54 975.1	  	699 19 042.8	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	DE	  		  	999 54 976.9	  	699 28 969.6	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	DE	  		  	999 54 979.3	  	699 24 965.1	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	DE	  		  	999 73 800.8	  	699 34 332.1	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	DE	  		  	10 010 551.9	  	699 43 793.8	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	DE	  		  	10 010 552.7	  	699 44 493.7	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	DE	  		  	10 010 561.8	  	699 44 039.4	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	DE	  		  	10 010 562.6	  	699 43 794.6	  	Process for the Polymerization of Olefins, Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	CN	  		  	2009 80 107 281.8	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation	  	CN	  		  	2009 80 107 283.7	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	CN	  		  	2007 80 043 823.0	  		  	High-Pressure Separator
						
	Westlake Longview Corporation	  	CN	  		  	2007 80 027 554.9	  	2007 80 027 554.9	  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	CN	  		  	2007 80 016 896.0	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization
						
	Westlake Longview Corporation	  	CN	  		  	2007 80 013 956.3 956.3	  	ZL 2007 80 013	  	Simplified Process to Prepare Polyolefins from Saturated Hydrocarbons
						
	Westlake Longview Corporation	  	CN	  		  	00818410.0	  	818410.0	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS

  

					
		  	21	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application

Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	CN	  		  	1803559.0	  	1803559.0	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	CN	  		  	01806302.0	  	1806302.0	  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	CN	  		  	02814853.3	  	ZL 2814853.3	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	CN	  		  	02814854.1	  	ZL 2814854.1	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	CN	  		  	02814921.1	  	ZL 2814921.1	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	CN	  		  	02825849.5	  	ZL 02825849.5	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	CN	  		  	3809613.7	  	ZL03809613.7	  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS
						
	Westlake Longview Corporation	  	CN	  		  	200480022627.1	  	ZL 200480022627.1	  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	CN	  		  	99803366.9	  	99803366.9	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	CN	  		  	99812700.0	  	99812700.0	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	CN	  		  	99815328.1	  	99815328.1	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	CN	  		  	99815333.8	  	99815333	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	CN	  		  	99816605.7	  	99816605.7	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	CN	  		  	99816606.5	  	99816606.5	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	CN	  		  	99816663.4	  	99816663.4	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	CN	  		  	99816673.1	  	99816673.1	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE

  

					
		  	22	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application

Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	CN	  		  	99816675.8	  	99816675.8	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	CN	  		  	99816849.1	  	99816849.1	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	CN	  		  	99816851.3	  	99816851.3	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	CN	  		  	99816875.0	  	99816875.0	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	CN	  		  	99816881.5	  	ZL 99816881.5	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	CN	  		  	99817101.8	  	ZL99817101.8	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	CN	  		  	200580037378.8	  	ZL200580037378.8	  	Method for Preventing or Inhibiting Fouling in a Gas-Phase Polyolefin Polymerization Process
						
	Westlake Longview Corporation	  	CN	  		  	200710006706.9	  	ZL200710006706.9	  	Process for the Polymerization of Olefins, Novel Polyethylenes, and Films and Articles Produced Therefrom
						
	Westlake Longview Corporation	  	CN	  		  	03824621.X	  		  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	CN	  		  	99816674.X	  	99816674.X	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	CN	  		  	99817100.X	  	0099817100.X	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	BR	  		  	BR112013004977-4	  		  	Method for Preventing or Reducing Clogging of a Fines Ejector
						
	Westlake Longview Corporation	  	BR	  		  	PI 0015594-2	  	PI 0015594-2	  	PROCESS FOR REDUCING THE MOLECULAR WEIGHT AND MELT INDEX RATIO OF POLYETHYLENES AND POLYETHYLENE PRODUCTS
						
	Westlake Longview Corporation	  	BR	  		  	PI 0107599-3	  		  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	BR	  		  	PI 0107604-3	  		  	CATALYST FOR OLEFIN POLYMERIZATION
						
	Westlake Longview Corporation	  	BR	  		  	PI 0211174-8	  	PI 0211174-8	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF

  

					
		  	23	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application

Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	BR	  		  	PI 0211175-6	  	PI 0211175-6	  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	BR	  		  	PI 0211176-4	  		  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	BR	  		  	PI 0215091-3	  	PI 0215091-3	  	STIFFENING AND CLARIFYING AGENTS FOR ETHYLENE OLEFIN COPOLYMER FILMS
						
	Westlake Longview Corporation	  	BR	  		  	PI 0309639-4	  		  	PURIFICATION OF POLYOLEFINS WITH RESIDUAL UNSATURATED COMONOMERS
						
	Westlake Longview Corporation	  	BR	  		  	PI 0314975-7	  		  	PROCESS FOR THE POLYMERIZATION OF ETHYLENE AND INTERPOLYMERS THEREOF
						
	Westlake Longview Corporation	  	BR	  		  	PI 0413279-3	  		  	PROCESS FOR THE GAS-PHASE POLYMERIZATION OF ALPHA OLEFINS
						
	Westlake Longview Corporation	  	BR	  		  	PI 9711932-6	  	PI 9711932-6	  	METHOD FOR IMPROVED COOLING OF FLUID BED POLYMER REACTOR
						
	Westlake Longview Corporation	  	BR	  		  	PI 9907069-3	  	PI 9907069-3	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	BR	  		  	PI 9912916-7	  	PI 9912916-7	  	PRODUCTION OF HIGH CLARITY LINEAR LOW DENSITY POLYETHYLENE USING GAS PHASE TECHNOLOGY
						
	Westlake Longview Corporation	  	BR	  		  	PI 9914828-5	  	PI 9914828-5	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	BR	  		  	PI 9915578-8	  	PI 9915578-8	  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917189-9	  		  	LINEAR POLYETHYLENE WITH IMPROVED COMONOMER EFFICIENCY AND PROCESS THEREFORE
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917239-9	  	PI 9917239-9	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917242-9	  	PI 9917242-9	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917244-5	  	PI 9917244-5	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917247	  	PI 9917247-0	  	PROCESS FOR THE PRODUCTION OF POLYETHYLENE

  

					
		  	24	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Longview Corporation	  	BR	  		  	PI 9917352	  	PI 9917352-2	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917353	  	PI 9917353-0	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917354	  	PI 9917354-9	  	PROCESS FOR PRODUCING POLYETHYLENE HAVING REDUCED CRYSTALLINITY
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917391	  	PI 9917391-3	  	PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917467	  	PI 9917467-7	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917468	  	PI 9917468-5	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	BR	  		  	PI 9917469-3	  	PI 9917469-3	  	PROCESS FOR PRODUCING POLYOLEFINS WITH DINITROGEN MONOXIDE AS ANTISTAT
						
	Westlake Longview Corporation	  	BR	  		  	PI 0517628-0	  		  	Method for Preventing or Inhibiting Fouling in a Gas-Phase Polyolefin Polymerization Process
						
	Westlake Longview Corporation	  	BR	  		  	PI 0711478-8	  		  	Swirling Fluidized-bed Reactors for Olefin Polymerization
						
	Westlake Longview Corporation	  	BR	  		  	PI 0711530-0	  		  	Simplified Process to Prepare Polyolefins From Saturated Hydrocarbons
						
	Westlake Longview Corporation	  	BR	  		  	PI 0714363-0	  		  	Process and Apparatus for Olefin Polymerization in a Fluidized Bed Reactor
						
	Westlake Longview Corporation	  	BR	  		  	PI 0719426-9	  		  	High-Pressure Separator
						
	Westlake Longview Corporation	  	BR	  		  	PI 0719702-1	  		  	Gas Distribution Plate for Fluidized-Bed Olefin Polymerization Reactors
						
	Westlake Longview Corporation	  	BR	  		  	PI 0907507-0	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Reactors
						
	Westlake Longview Corporation	  	BR	  		  	PI 0908378-2	  		  	Method of Preventing or Reducing Polymer Agglomeration on Grid in Fluidized Bed Vessel
						
	Westlake Longview Corporation & PRI Asphalt Technologies, Inc.	  	US	  		  	12/328,209	  	RE42,165	  	Reissue - Modified Asphalt Compositions

  

					
		  	25	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Petrochemicals, LP	  	US	  		  	09/276,316	  	6,276,167	  	REFRIGERATION PRODUCTION
						
	Westlake Petrochemicals, LP	  	US	  		  	10/172,228	  	6,830,607	  	Slurry tray and slurry tray assembly for use in fractionation towers
						
	Westlake Petrochemicals, LP	  	US	  		  	11/295,410	  	7,503,961	  	BOILER FEED WATER DEAERATOR PROCESS METHOD AND APPARATUS
						
	Westlake Petrochemicals, LP	  	MY	  		  	PI20070911	  	MY-1458777-A	  	BOILER FEED WATER DEAERATOR PROCESS METHOD AND APPARATUS
						
	Westlake Petrochemicals, LP	  	EP	  		  	5853201.1	  		  	BOILER FEED WATER DEAERATOR PROCESS METHOD AND APPARATUS
						
	Westlake Petrochemicals, LP	  	CN	  		  	200580047878.X	  	20058004787	  	BOILER FEED WATER DEAERATOR PROCESS METHOD AND APPARATUS
						
	Westlake Petrochemicals, LP	  	CA	  		  	2,589,991	  	2,589,991	  	BOILER FEED WATER DEAERATOR PROCESS METHOD AND APPARATUS
						
	WPT LLC	  	US	  		  	13/066,211	  	8,703,064	  	Hydrocarbon Cracking Furnace with Steam Addition to Lower Mono-Nitrogen Oxide Emissions
						
	WPT LLC	  	US	  		  	14/065,041	  		  	Preventing Cold Box Shut Down
						
	Westlake Vinyl Corporation	  	US	  		  	08/475,566	  	5,558,746	  	APPARATUS FOR QUENCHING A GAS STREAM IN THE PRODUCTION OF VINYL CHLORIDE MONOMER
						
	Westlake Vinyl Corporation	  	US	  		  	12/221,878	  	8,317,994	  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	US	  		  	13/650,932	  		  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	WO	  		  	PCT/US2009/04535	  		  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	JP	  		  	2011-522067	  	5,529,866	  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	ID	  		  	PCT/US09/004535	  	PDP000034403	  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	IN	  		  	1617/DELNP/2011	  		  	Catholyte Heat Recovery Evaporator And Method of Use

  

					
		  	26	  	Schedule 6.9

											
	 Owner
	  	 Country
	  	 	  	 Application
Number
	  	 Patent Number
	  	 Title

						
	Westlake Vinyl Corporation	  	EP	  		  	09802871	  		  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	CH	  		  	200980140334.6	  		  	Catholyte Heat Recovery Evaporator And Method of Use
						
	Westlake Vinyl Corporation	  	BR	  		  	PI0916662-9	  		  	Catholyte Heat Recovery Evaporator And Method of Use

 Patents notated are subject to one or more of 3 license agreements relating to ENERGX® technology 
  

	*Note 1:	6,359,050 is subject to the Hanwha and BP License Agreements 

	*Note 2:	6,417,296 is subject to the Hanwha and BP License Agreements 

	*Note 3:	6,534,613 is subject to the Chevron, Hanwha, and BP License Agreements 

	*Note 4:	6,608,152 is subject to the Hanwha and BP License Agreements 

	*Note 5:	6,765,048 is subject to the Hanwha License Agreement 

	*Note 6:	5,969,061 is subject to the Hanwha and BP License Agreements 

	*Note 7:	6,147,179 is subject to the Hanwha and BP License Agreements 

	*Note 8:	6,130,293 is subject to the Chevron, Hanwha, and BP License Agreements 

	*Note 9:	6,204,335 is subject to the Hanwha and BP License Agreements 

	*Note 10:	6,197,887 is subject to the Hanwha and BP License Agreements 

	*Note 11:	6,070,394 is subject to the Hanwha and BP License Agreements 

	*Note 12:	6,153,702 is subject to the Hanwha and BP License Agreements 

	*Note 13:	6,228,957 is subject to the Chevron, Hanwha, and BP License Agreements 

	*Note 14:	6,191,239 is subject to the Chevron, Hanwha, and BP License Agreements 

	*Note 15:	6,271,321 is subject to the Chevron, Hanwha, and BP License Agreements 

	*Note 16:	6,417,301 is subject to the Hanwha License Agreement 

	*Note 17:	6,191,238 is subject to the Hanwha and BP License Agreements 

	*Note 18:	6,291,613 is subject to the Hanwha and BP License Agreements 

	*Note 19:	6,300,432 is subject to the Hanwha and BP License Agreements 

  

					
		  	27	  	Schedule 6.9

 TRADEMARKS 

 

									
	 Owner
	 	 Title
	 	 Application

Number
	 	 Country
	 	 Registration

Number

					
	 North American Pipe Corporation
	 	NORTH AMERICAN PIPE	 	78/755,077	 	US	 	3,400,381
					
	 North American Pipe Corporation
	 	

	 	85/370,540	 	US	 	4,366,675
					
	 North American Pipe Corporation
	 	

	 	8825448	 	MX	 	1,024,554
					
	 North American Pipe Corporation
	 	

	 	77/137,153	 	US	 	3,686,515
					
	 North American Pipe Corporation
	 	

	 	882547	 	MX	 	1,024,553
					
	 North American Pipe Corporation
	 	

	 	77/137,140	 	US	 	3,686,514
					
	 North American Pipe Corporation
	 	AMERI-LOCK	 	85/370,546	 	US	 	
					
	 North American Pipe Corporation
	 	AMERI- Lock Logo	 	85/770,202	 	US	 	
					
	 North American Pipe Corporation
	 	AMERI-GRIP	 	85/370,559	 	US	 	
					
	 North American Pipe Corporation
	 	RIGHT, ON TIME, ALL THE TIME	 	78/791,791	 	US	 	3,464,198
					
	 North American Specialty Products
	 	N in a box with NASP name logo	 	85/967,163	 	US	 	

  

					
		  	28	  	Schedule 6.9

									
					
	 North American Specialty Products
	 	N in a box with NASP name logo	 	85/967,163	 	US	 	
					
	 North American Specialty Products
	 	N in a box with NASP name logo	 	86/137,630	 	US	 	
					
	 North American Specialty Products
	 	N in a box with NASP name logo	 	86/330,800	 	US	 	
					
	 North American Specialty Products
	 	N in a box with NASP name logo	 	To be assigned	 	US	 	
					
	 North American Specialty Products
	 	Certa-Lok	 	1480957	 	AU	 	1480957
					
	 North American Specialty Products
	 	Certa-Lok	 	85/432,130	 	US	 	4,146,376
					
	 North American Specialty Products
	 	Certa Lok (design)	 	1480959	 	AU	 	1480959
					
	 North American Specialty Products
	 	Certa Lok (design)	 	85/432,130	 	US	 	4,146,379
					
	 North American Specialty Products
	 	Certa-Set	 	85/860,247	 	US	 	4.407,095
					
	 North American Specialty Products
	 	Certa-Set (design)	 	85/844,950	 	US	 	
					
	 North American Specialty Products
	 	Certa-Set Emerald	 	86/261,855	 	US	 	
					
	 North American Specialty Products
	 	Certa-Com	 	86/154,409	 	US	 	
					
	 North American Specialty Products
	 	Certa-Flo	 	86/155,706	 	US	 	
					
	 North American Specialty Products
	 	CertaForm	 	1521640	 	CA	 	
					
	 North American Specialty Products
	 	CertaForm	 	85/278,545	 	US	 	4,075,377
					
	 North American Specialty Products
	 	CertaFrame	 	1594387	 	CA	 	
					
	 North American Specialty Products
	 	Fluid-Tite	 	72/066,550	 	US	 	691497
					
	 North American Specialty Products
	 	Fluid-Tite	 	86/155,703	 	US	 	

  

					
		  	29	  	Schedule 6.9

									
					
	 North American Specialty Products
	 	Form-A-Drain	 	1,673,750	 	CA	 	
					
	 North American Specialty Products
	 	Form-A-Drain	 	1,673,761	 	CA	 	
					
	 North American Specialty Products
	 	Form-A-Drain	 	74/390,948	 	US	 	1,862,516
					
	 North American Specialty Products
	 	Form-A-Drain (design)	 	86/154,445	 	US	 	
					
	 North American Specialty Products
	 	Greenline	 	86/155,704	 	US	 	
					
	 North American Specialty Products
	 	Kwik-Set	 	78/173,596	 	US	 	2,799,420
					
	 North American Specialty Products
	 	QuadraShield	 	85/894,393	 	US	 	
					
	 North American Specialty Products
	 	StraightShot	 	1570076	 	AU	 	
					
	 North American Specialty Products
	 	StraightShot	 	85/829,013	 	US	 	4,472,379
					
	 North American Specialty Products
	 	StraightShot (design)	 	85/966,970	 	US	 	
					
	 North American Specialty Products
	 	Sure-Fit	 	86/155,707	 	US	 	
					
	 North American Specialty Products
	 	Sure-Fit (design)	 	86/156,157	 	US	 	
					
	 North American Specialty Products
	 	T-Roc	 	77/629,630	 	US	 	3,782,202
					
	 North American Specialty Products
	 	Yellow	 	85/756,047	 	US	 	
					
	 North American Specialty Products
	 	Yellow	 	85/071,676	 	US	 	
					
	 North American Specialty Products
	 	Yellomine	 	86/071,046	 	US	 	
					
	 North American Specialty Products
	 	Yellomine	 	86/072,258	 	US	 	
					
	 Westech Building Products, Inc.
	 	Brock	 	86/114,433	 	US	 	

  

					
		  	30	  	Schedule 6.9

									
					
	 Westech Building Products, Inc.
	 	Brock Deck	 	75/250,457	 	US	 	2,163.660
					
	 Westech Building Products, Inc.
	 	Brock Deck	 	1137624	 	CA	 	TMA595752
					
	 Westech Building Products, Inc.
	 	Brock Deck	 	161993	 	Poland	 	161993
					
	 Westech Building Products, Inc.
	 	Brock Dock (design)	 	74/003,133	 	US	 	1,604,682
					
	 Westech Building Products, Inc.
	 	Brock Dock	 	1,137,623	 	CA	 	TMA595,780
					
	 Westech Building Products, Inc.
	 	Deck Lok	 	86/211,796	 	US	 	
					
	 Westech Building Products, Inc.
	 	Deck Lok (design)	 	86/211,803	 	US	 	
					
	 Westech Building Products, Inc.
	 	ENERPRO	 	555615	 	CA	 	TMA337,905
					
	 Westech Building Products, Inc.
	 	e-Rail	 	86/285,174	 	US	 	
					
	 Westech Building Products, Inc.
	 	e-Rail (design)	 	86/285,104	 	US	 	
					
	 Westech Building Products, Inc.
	 	PRESIDIO	 	1,359,964	 	CA	 	TMA775,354
					
	 Westech Building Products, Inc.
	 	PRESIDIO	 	77/104,411	 	US	 	3,542,439
					
	 Westech Building Products, Inc.
	 	PRESIDIO (Fencing products)	 	78/451,912	 	US	 	3,101,878
					
	 Westech Building Products, Inc.
	 	PRESIDIO (Outdoor Furniture)	 	76/140,044	 	US	 	2,791,879
					
	 Westech Building Products, Inc.
	 	PRESIDIO (Vinyl Decks)	 	882360	 	CA	 	TMA516,645
					
	 Westech Building Products, Inc.
	 	PRESIDIO (Vinyl Decks)	 	78/094,995	 	US	 	2,796,046
					
	 Westech Building Products, Inc.
	 	QUANTUM	 	86/324,780	 	US	 	

  

					
		  	31	  	Schedule 6.9

									
					
	 Westech Building Products, Inc.
	 	RELIANT	 	1,399,886	 	CA	 	TMA779,467
					
	 Westech Building Products, Inc.
	 	RELIANT	 	76/359,294	 	US	 	2,830,507
					
	 Westech Building Products, Inc.
	 	SCENIX	 	1,359,472	 	CA	 	TMA754,283
					
	 Westech Building Products, Inc.
	 	SCENIX	 	6208323	 	CN	 	6,208,323
					
	 Westech Building Products, Inc.
	 	SCENIX	 	77/103,005	 	US	 	3,554,661
					
	 Westech Building Products, Inc.
	 	

	 	1,359,473	 	CA	 	TMA754,281
					
	 Westech Building Products, Inc.
	 	

	 	6208322	 	CN	 	6,208,322
					
	 Westech Building Products, Inc.
	 	

	 	77/105,551	 	US	 	3,554,668
					
	 Westech Building Products, Inc.
	 	SENTINEL	 	1,399,885	 	CA	 	TMA781,283
					
	 Westech Building Products, Inc.
	 	SENTINEL	 	1,470,687	 	CA	 	TMA816,233
					
	 Westech Building Products, Inc.
	 	SENTINEL	 	76/359,293	 	US	 	2,863,238
					
	 Westech Building Products, Inc.
	 	TRUGRAIN	 	1,397,829	 	CA	 	TMA757,260
					
	 Westech Building Products, Inc.
	 	TRUGRAIN	 	77/336,593	 	US	 	3,606,956
					
	 Westech Building Products, Inc.
	 	

	 	1,397,828	 	CA	 	TMA808,524
					
	 Westech Building Products, Inc.
	 	

	 	77/336,613	 	US	 	3,709,337
					
	 Westech Building Products, Inc.
	 	TRUGRAIN	 	86/266,850	 	US	 	
					
	 Westech Building Products, Inc.
	 	ULTRAVIEW	 	78/502,089	 	US	 	3812210

  

					
		  	32	  	Schedule 6.9

									
					
	 Westech Building Products, Inc.
	 	

	 	78/758,721	 	US	 	3,357,498
					
	 Westech Building Products, Inc.
	 	

	 	1,406,254	 	CA	 	TMA761,457
					
	 Westech Building Products, Inc.
	 	WESTECH	 	785965	 	CA	 	TMA520324
					
	 Westech Building Products, Inc.
	 	WESTECH	 	78/353,474	 	US	 	3,184,398
					
	 Westech Building Products, Ltd.
	 	WESTECH	 	8710220	 	China	 	8,710,220
					
	 Westlake Longview Corporation
	 	DCX	 	825057760	 	BR	 	825057760
					
	 Westlake Longview Corporation
	 	DCX	 		 	CN	 	3360103
					
	 Westlake Longview Corporation
	 	DCX	 		 	Community Trademark	 	2915262
					
	 Westlake Longview Corporation
	 	DCX	 		 	FR	 	00/3030640
					
	 Westlake Longview Corporation
	 	DCX	 		 	GB	 	2234241
					
	 Westlake Longview Corporation
	 	DCX	 		 	SK	 	95205
					
	 Westlake Longview Corporation
	 	DCX	 		 	Taiwan	 	155074
					
	 Westlake Longview Corporation
	 	DCX	 		 	US	 	2,949,755
					
	 Westlake Longview Corporation
	 	EBAC	 		 	SK	 	533801
					
	 Westlake Longview Corporation
	 	EBAC	 		 	US	 	1926998
					
	 Westlake Longview Corporation
	 	ELEVATE	 	85/152,138	 	US	 	4,376,830

  

					
		  	33	  	Schedule 6.9

									
					
	 Westlake Longview Corporation
	 	EMAC	 		 	SK	 	533802
					
	 Westlake Longview Corporation
	 	EMAC	 		 	US	 	1763877
					
	 Westlake Longview Corporation
	 	ENERGX	 	825057752	 	BR	 	
					
	 Westlake Longview Corporation
	 	ENERGX	 		 	CN	 	3360102
					
	 Westlake Longview Corporation
	 	ENERGX	 		 	Community Trademark	 	2916419
					
	 Westlake Longview Corporation
	 	ENERGX	 		 	SK	 	95204
					
	 Westlake Longview Corporation
	 	ENERGX	 		 	US	 	2500716
					
	 Westlake Longview Corporation
	 	EPOLENE	 	1965-001754	 	AR	 	1694746
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	AU	 	A192151
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	AU	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	Benelux	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	825346916	 	BR	 	825346916
					
	 Westlake Longview Corporation
	 	EPOLENE	 	825346894	 	BR	 	825346894
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	CA	 	157730
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	CN	 	1028029
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	CN	 	1032360
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Czech Republic	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	Denmark	 	2030/1998

  

					
		  	34	  	Schedule 6.9

									
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	FI	 	31858
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	FR	 	1630997
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	GB	 	747243
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	GE	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	GK	 	21693
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Hungary	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	International	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Italy	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	JP	 	554466
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	JP	 	558830
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Liechtenstein	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	Madagascar	 	00420MV
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	Morocco	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	MX	 	447236
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	MX	 	425248
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	MX	 	577637
					
	 Westlake Longview Corporation
	 	EPOLENE	 	19560557	 	Norway	 	49810
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	O.A.P.I.	 	29062

  

					
		  	35	  	Schedule 6.9

									
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Portugal	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Romania	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	San Marino	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Serbia-Montenegro	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Serbia-Montenegro	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	South Africa	 	065/5170
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	South Africa	 	065/5171
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	SP	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 		 	Sweden	 	330896
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Switzerland	 	2R189707
					
	 Westlake Longview Corporation
	 	EPOLENE	 	71/689,126	 	US	 	630,676
					
	 Westlake Longview Corporation
	 	EPOLENE	 	72/193,003	 	US	 	794,963
					
	 Westlake Longview Corporation
	 	EPOLENE	 	1965-001754	 	Venezuela	 	53176
					
	 Westlake Longview Corporation
	 	EPOLENE	 	1968-003873	 	Venezuela	 	61287
					
	 Westlake Longview Corporation
	 	EPOLENE	 	189.207	 	Vietnam	 	2R189707
					
	 Westlake Longview Corporation
	 	HIFOR CLEAR	 	77/332,028	 	US	 	3,661,577
					
	 Westlake Longview Corporation
	 	HIFOR	 	77/332,034	 	US	 	3,661,578
					
	 Westlake Longview Corporation
	 	HIFOR XTREME	 	77/385,212	 	US	 	3,670,225

  

					
		  	36	  	Schedule 6.9

									
					
	 Westlake Longview Corporation
	 	MXSITE	 	75/558,863	 	US	 	2,460,082
					
	 Westlake Longview Corporation
	 	MXSTEN	 	1,048,756	 	CA	 	555 540
					
	 Westlake Longview Corporation
	 	MXSTEN	 	411,709	 	MX	 	671841
					
	 Westlake Longview Corporation
	 	MXSTEN	 	75/342,809	 	US	 	2,434,458
					
	 Westlake Longview Corporation
	 	TYMAX	 	85/043,415	 	US	 	4,154,643
					
	 Westlake Polymers LLC
	 	TRUCOAT	 	86/240,649	 	US	 	
					
	 Westlake Polymers LLC
	 	

	 	To be assigned	 	US	 	
					
	 Westlake Polymers LLC
	 	WESTLAKE TRUCOAT	 	86/240,645	 	US	 	
					
	 Westlake Chemical Corporation
	 	

	 	74/094,804	 	US	 	1676459
					
	 Westlake Chemical Corporation
	 	

	 	73/834,997	 	US	 	1607903
					
	 Westlake Chemical Corporation
	 	

	 	75/175,049	 	US	 	2293058
					
	 Westlake Chemical Corporation
	 	WESTLAKE	 	78/629,125	 	US	 	3097836
					
	 Westlake Chemical Corporation
	 	

	 	78/629,138	 	US	 	3207461
					
	 Westlake Chemical Corporation
	 	W in a box	 	86/235,028	 	US	 	
					
	 Westlake Chemical Corporation
	 	WESTLAKE	 	012716517	 	European - CTM	 	
					
	 Westlake Chemical Corporation
	 	WESTLAKE (design)	 	012716502	 	European - CTM	 	

  

					
		  	37	  	Schedule 6.9

									
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	831005661	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	831005670	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	831005688	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	8852328	 	China	 	8852328
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	8852329	 	China	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	8852330	 	China	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	2055957	 	India	 	
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	D00.2010.043230	 	Indonesia	 	IDM000358356
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	D00.2010.043233	 	Indonesia	 	IDM000339966
					
	 Westlake Vinyl Corporation
	 	WESTLAKE	 	D00.2010.043235	 	Indonesia	 	IDM000358116
					
	 Westlake Vinyl Corporation
	 	

	 	831005696	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	

	 	831005700	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	

	 	831005718	 	Brazil	 	
					
	 Westlake Vinyl Corporation
	 	

	 	8852331	 	China	 	8852331
					
	 Westlake Vinyl Corporation
	 	

	 	8852332	 	China	 	

  

					
		  	38	  	Schedule 6.9

									
					
	 Westlake Vinyl Corporation
	 	

	 	8852335	 	China	 	
					
	 Westlake Vinyl Corporation
	 	

	 	2055958	 	India	 	
					
	 Westlake Vinyl Corporation
	 	W in a box	 	D00.2010.043231	 	Indonesia	 	IDM000358358
					
	 Westlake Vinyl Corporation
	 	W in a box	 	D00.2010.043232	 	Indonesia	 	
					
	 Westlake Vinyl Corporation
	 	

	 	D00.2010.043234	 	Indonesia	 	DM000358175

  

					
		  	39	  	Schedule 6.9

 MANUFACTURING LICENSES 

 

									
	 Effective Date
	  	 Product/Service
	  	 Contracting Westlake Legal Entity Name
	  	 Current Westlake Legal Entity
Name
	  	 Outside Party

					
	 01-May-2014
	  	Process Optimization License	  	Westlake Chemical Corporation	  	Westlake Chemical Corporation	  	ANSYS, Inc.
					
	 27-Aug-2010
	  	Plant Optimization MSC Products Software for all Westlake manufacturing sites, including China	  	Westlake Chemical Corporation	  	Westlake Chemical Corporation	  	Aspen MSC Products
					
	 27-Aug-2010
	  	Plant Optimization Engineering Software for all Westlake manufacturing sites, including China	  	Westlake Chemical Corporation	  	Westlake Chemical Corporation	  	Aspen Engineering Products
					
	 23-May-1996
	  	Polyethylene manufacturing technology	  	Westlake Longview Corporation	  	Westlake Longview Corporation	  	INEOS Chemicals
					
	 29-Dec-1988
	  	Petro 1 Ethylene Cracker & Recovery Unit	  	Westlake Petrochemicals Corp.	  	Westlake Petrochemicals LLC	  	KBR (formerly M W Kellogg)
					
	 18-Apr-1995
	  	Petro 2 Ethylene Cracker & Recovery Unit	  	WPT	  	WPT	  	Lummus (formerly ABB Lummus Crest)
					
	 16-Jul-1997
	  	Sale including Ethylene production license	  	Westlake Monomers Corporation	  	Westlake Vinyl Corporation	  	B F Goodrich
					
	 25-Mar-2005
	  	Petro 2 Feed Flexibility	  	WPT	  	WPT	  	Lummus Technology

  

					
		  	40	  	Schedule 6.9

									
	 Effective Date
	  	 Product/Service
	  	 Contracting Westlake Legal Entity Name
	  	 Current Westlake Legal Entity
Name
	  	 Outside Party

					
	 30-Sept-2010
	  	Petro 2 Expansion	  	Westlake Petrochemicals Corp.	  	Westlake Petrochemicals LLC	  	Lummus Technology
					
	 15-Nov-2011
	  	Calvert City Furnace Revamp	  	Westlake Vinyl Corporation	  	Westlake Vinyl Corporation	  	Technip USA Inc.
					
	 01-Oct-2012
	  	Calvert City Ethane Conversion & Expansion	  	Westlake Vinyl Corporation	  	Westlake Vinyl Corporation	  	Technip USA Inc.
					
	 19-Dec-2012
	  	Agreement for License, Engineering & Material Supply relating to One SRT Ethylene Cracking Heater (Petro 2 Furnace 7) at Sulphur, LA	  	Westlake Petrochemicals LLC	  	Westlake Petrochemicals LLC	  	Lummus Technology
					
	 03-Jun-2013
	  	Calvert City EDC Cracking Furnace	  	Westlake Vinyl Corporation	  	Westlake Vinyl Corporation	  	Technip & Stone & Webster
					
	 27-Sept-2013
	  	Agreement for License, Engineering & Material Supply relating to One SRT Ethylene Cracking Heater (Petro 1 Furnace 8) at Sulphur, LA	  	Westlake Petrochemicals LLC	  	Westlake Petrochemicals LLC	  	Lummus Technology
					
	 24-Oct-1996
	  	KadenceTM End-User Software	  	Westlake Petrochemicals Corp.	  	Westlake Petrochemicals LLC	  	M W Kellogg Co
					
	 31-Aug-2010
	  	Technology and Engineering for 2011 Furnace Expansion - Short Resident Time (SRT) Pyrolysis Heater	  	Westlake Petrochemicals LLC	  	Westlake Petrochemicals LLC	  	Lummus Technology Inc.

  

					
		  	41	  	Schedule 6.9

									
	 Effective Date
	  	 Product/Service
	  	 Contracting Westlake Legal Entity Name
	  	 Current Westlake Legal Entity
Name
	  	 Outside Party

					
	 20-Dec-2002
	  	GasBuyer for natural gas purchasing program	  	Westlake Petrochemicals LP	  	Westlake Petrochemicals LLC	  	Planalytics Inc.
					
	 1-Jan-2004
	  	Polyethylene	  	Westlake Petrochemicals LP	  	Westlake Petrochemicals LLC	  	NOVA Chemicals, Inc.
					
	 31-Dec-2004
	  	Gas Buyer Software	  	Westlake Petrochemicals LP	  	Westlake Petrochemicals LLC	  	Planalytics, Inc.
					
	 11-Dec-2006
	  	License - SCORE technology millisecond furnace with ExxonMobil	  	Westlake Petrochemicals LP	  	Westlake Petrochemicals LLC	  	Kellogg Brown & Root LLC
					
	 23-May-2008
	  	plant optimization software	  	Westlake Petrochemicals Corp.	  	Westlake Petrochemicals LLC	  	Pavilion Technologies
					
	 1-May-1993
	  	Manufacture and sale of linear polyethylene	  	Westlake Polymers Corporation	  	Westlake Polymers LLC	  	INEOS Chemicals
					
	 03-Sept-2003
	  	Settlement Agreement Amending Manufacture and sale of linear polyethylene	  	Westlake Polymers Corporation	  	Westlake Polymers LLC	  	INEOS Chemicals
					
	 1-Feb-1998
	  	Software Services	  	Westlake Technology Corp.	  	Westlake Polymers LLC	  	Kinetics Technology International Corporation

  

					
		  	42	  	Schedule 6.9

									
	 Effective Date
	  	 Product/Service
	  	 Contracting Westlake Legal Entity Name
	  	 Current Westlake Legal Entity
Name
	  	 Outside Party

					
	 15-May-1998
	  	Ziegler Catalyst	  	Westlake Polymers Corporation	  	Westlake Polymers LLC	  	INEOS Chemical
					
	 6-Oct-2000
	  	Software - instrumentation	  	Westlake CA&O	  	Westlake Vinyls, Inc.	  	Fisher-Rosemount Sys.
					
	 7-May-2006
	  	Polyethylene technology	  	Westlake Polymers Corporation	  	Westlake Polymers LLC	  	INEOS Chemical
					
	 9-May-1995
	  	Styrene Licensee Know-How Exchange Agreement.	  	Westlake Styrene Corporation	  	Westlake Styrene LLC	  	Raytheon Engineers & Constructor (Acting by and through its Badgar Tech.Center)
					
	 1-Jan-2004
	  	EBMAX technology to manufacture styrene	  	Westlake Styrene LP	  	Westlake Styrene LLC	  	Badger Licensing LLC
					
	 1-Jan-2004
	  	Styrene manufacturing technology	  	Westlake Styrene LP	  	Westlake Styrene LLC	  	Badger Licensing LLC
					
	 1-Nov-2005
	  	new ethylene benzene styrene technology	  	Westlake Styrene LP	  	Westlake Styrene LLC	  	Stone & Webster, Inc.
					
	 1-Nov-2005
	  	technology services license	  	Westlake Styrene LP	  	Westlake Styrene LLC	  	Stone & Webster, Inc.

  

					
		  	43	  	Schedule 6.9

									
	 Effective Date
	  	 Product/Service
	  	 Contracting Westlake Legal Entity Name
	  	 Current Westlake Legal Entity
Name
	  	 Outside Party

					
	 5-Jun-2000
	  	Bipolar Electrolyzers in Calvert City	  	Westlake CA&O	  	Westlake Vinyls, Inc.	  	Asahi Chemical Industry Co., Ltd.
					
	 1-Aug-2010
	  	PAR Technology (Phenylacetylene Removal)	  	Westlake Styrene LLC	  	Westlake Styrene LLC	  	Badger Licensing LLC
					
	 1-Mar-2011
	  	Manufacturing and Marketing License for Viperloc technology	  	North American Pipe Corporation	  	North American Pipe Corporation	  	S&B Technical Products LLC
					
	 1-Mar-2011
	  	Manufacturing and Marketing License for Ameri-Grip Technology	  	North American Pipe Corporation	  	North American Pipe Corporation	  	MaxLock LLC
					
	 15-May-2005
	  	Settlement Agreement and Patent License	  	Weatherford (formerly Modern Products)	  	North American Specialty Products	  	North American Specialty Products

  

					
		  	44	  	Schedule 6.9

 DOMAIN NAMES 

 

					
	 Owner
	  	 County / Region
	  	 Domain Name

	Westlake Chemical Corporation	  	USA	  	4wlg.com
	Westlake Chemical Corporation	  	USA	  	ameriflow.com
	Westlake Chemical Corporation	  	USA	  	bristolpipe.com
	Westlake Chemical Corporation	  	USA	  	ebac.info
	Westlake Chemical Corporation	  	USA	  	emac.info
	Westlake Chemical Corporation	  	USA	  	energx.info
	Westlake Chemical Corporation	  	USA	  	energx.net
	Westlake Chemical Corporation	  	USA	  	energx.org
	Westlake Chemical Corporation	  	USA	  	epolene.com
	Westlake Chemical Corporation	  	USA	  	epolene.net
	Westlake Chemical Corporation	  	USA	  	e-presidio.com
	Westlake Chemical Corporation	  	USA	  	e-presidio.net
	Westlake Chemical Corporation	  	USA	  	e-westlakegroup.com
	Westlake Chemical Corporation	  	USA	  	e-westlakegroup.net
	Westlake Chemical Corporation	  	USA	  	flexiblepe.com
	Westlake Chemical Corporation	  	USA	  	flexpoly.com
	Westlake Chemical Corporation	  	USA	  	geismarvinyls.com
	Westlake Chemical Corporation	  	USA	  	geismarvinylscompanylp.com
	Westlake Chemical Corporation	  	USA	  	geismarvinylscorp.com
	Westlake Chemical Corporation	  	USA	  	gvclp.com
	Westlake Chemical Corporation	  	USA	  	gvc-lp.com
	Westlake Chemical Corporation	  	USA	  	iwestlake.com
	Westlake Chemical Corporation	  	USA	  	i-westlake.com
	Westlake Chemical Corporation	  	USA	  	mxsite.biz
	Westlake Chemical Corporation	  	USA	  	mxsite.com
	Westlake Chemical Corporation	  	USA	  	mxsite.info
	Westlake Chemical Corporation	  	USA	  	mxsten.com
	Westlake Chemical Corporation	  	USA	  	mxsten.info
	Westlake Chemical Corporation	  	USA	  	napipecorp.com
	Westlake Chemical Corporation	  	USA	  	northamericanpipe.com
	Westlake Chemical Corporation	  	USA	  	peformancepackaging.com

  

					
		 	45	 	Schedule 6.9

					
	 Owner
	  	 County / Region
	  	 Domain Name

	Westlake Chemical Corporation	  	USA	  	peforpackaging.com
	Westlake Chemical Corporation	  	USA	  	peplastics.com
	Westlake Chemical Corporation	  	USA	  	pepoly.com
	Westlake Chemical Corporation	  	USA	  	pepolymers.com
	Westlake Chemical Corporation	  	USA	  	specialtypolymers.com
	Westlake Chemical Corporation	  	USA	  	thewestlakegroup.com
	Westlake Chemical Corporation	  	USA	  	vinylauthority.com
	Westlake Chemical Corporation	  	USA	  	vinyldock.com
	Westlake Chemical Corporation	  	USA	  	wescopipe.com
	Westlake Chemical Corporation	  	USA	  	westechbuildingproducts.com
	Westlake Chemical Corporation	  	USA	  	westlake.com
	Westlake Chemical Corporation	  	USA	  	westlake.net
	Westlake Chemical Corporation	  	USA	  	westlakechem.com
	Westlake Chemical Corporation	  	USA	  	westlakechemical.com
	Westlake Chemical Corporation	  	USA	  	westlakechemicalcorporation.com
	Westlake Chemical Corporation	  	USA	  	westlakechemicals.com
	Westlake Chemical Corporation	  	USA	  	westlakechemicalscorparation.com
	Westlake Chemical Corporation	  	USA	  	westlakecommerce.com
	Westlake Chemical Corporation	  	USA	  	westlakecorp.com
	Westlake Chemical Corporation	  	USA	  	westlakeglobal.com
	Westlake Chemical Corporation	  	USA	  	westlakeglobal.net
	Westlake Chemical Corporation	  	USA	  	westlakegroup.com
	Westlake Chemical Corporation	  	USA	  	westlakegroupusa.com
	Westlake Chemical Corporation	  	USA	  	westlakegrp.com
	Westlake Chemical Corporation	  	USA	  	westlakeinc.net
	Westlake Chemical Corporation	  	USA	  	westlake-inc.net
	Westlake Chemical Corporation	  	USA	  	westlakeincorporated.com
	Westlake Chemical Corporation	  	USA	  	westlakeincorporated.net
	Westlake Chemical Corporation	  	USA	  	westlakeinternet.com
	Westlake Chemical Corporation	  	USA	  	westlakeinternet.net
	Westlake Chemical Corporation	  	USA	  	westlakeinternettraining.net
	Westlake Chemical Corporation	  	USA	  	westlakepe.com

  

					
		 	46	 	Schedule 6.9

					
	 Owner
	  	 County / Region
	  	 Domain Name

	Westlake Chemical Corporation	  	USA	  	westlakepe.net
	Westlake Chemical Corporation	  	USA	  	westlakepolyethylene.com
	Westlake Chemical Corporation	  	USA	  	westlakepolyethylene.net
	Westlake Chemical Corporation	  	USA	  	westlakevinyl.com
	Westlake Chemical Corporation	  	USA	  	westlakevinyl.net
	Westlake Chemical Corporation	  	USA	  	westlakevinylcompany.com
	Westlake Chemical Corporation	  	USA	  	westlakevinylcompany.net
	Westlake Chemical Corporation	  	USA	  	westlakevinyls.com
	Westlake Chemical Corporation	  	USA	  	westlakevinyls.net
	Westlake Chemical Corporation	  	USA	  	westlakevinylscompany.com
	Westlake Chemical Corporation	  	USA	  	westlakevinylscompany.net
	Westlake Chemical Corporation	  	USA	  	westlakeweb.com
	Westlake Chemical Corporation	  	USA	  	westlakeweb.net
	Westlake Chemical Corporation	  	USA	  	westlakewebtraining.com
	Westlake Chemical Corporation	  	USA	  	westlakewebtraining.net
	Westlake Chemical Corporation	  	USA	  	westlakeworld.com
	Westlake Chemical Corporation	  	USA	  	wlg.cc
	Westlake Chemical Corporation	  	USA	  	wlk.com
	Westlake Chemical Corporation	  	USA	  	wlkchem.com
	Westlake Chemical Corporation	  	USA	  	wlkchemical.com
	Westlake Chemical Corporation	  	USA	  	wlkchemicals.com
	Westlake Chemical Corporation	  	USA	  	westlakechina.com
	Westlake Chemical Corporation	  	Asia	  	epolene.asia
	Westlake Chemical Corporation	  	Asia	  	olefins.asia
	Westlake Chemical Corporation	  	Asia	  	westlakechemical.asia
	Westlake Chemical Corporation	  	China	  	epolene.com.cn
	Westlake Chemical Corporation	  	China	  	profiles.org.cn
	Westlake Chemical Corporation	  	China	  	vinyls.net.cn
	Westlake Chemical Corporation	  	China	  	westlakechem.cn
	Westlake Chemical Corporation	  	China	  	westlakechem.com.cn
	Westlake Chemical Corporation	  	China	  	westlakechemical.net.cn
	Westlake Chemical Corporation	  	China	  	epolene.net.cn

  

					
		 	47	 	Schedule 6.9

					
	 Owner
	  	 County / Region
	  	 Domain Name

	Westlake Chemical Corporation	  	China	  	olefins.net.cn
	Westlake Chemical Corporation	  	China	  	westlakechina.cn
	Westlake Chemical Corporation	  	China	  	westlakechina.com.cn
	Westlake Chemical Corporation	  	Hong Kong	  	westlake.hk
	Westlake Chemical Corporation	  	Hong Kong	  	wlk.hk
	Westlake Chemical Corporation	  	Hong Kong	  	wlk.com.hk
	Westlake Chemical Corporation	  	Taiwan	  	westlake.tw
	Westlake Chemical Corporation	  	Taiwan	  	wlk.tw
	Westech Building Products, Inc.	  	USA	  	enerpro.com
	Westech Building Products, Inc.	  	USA	  	fiberlux.com
	Westech Building Products, Inc.	  	USA	  	napg.biz
	Westech Building Products, Inc.	  	USA	  	napg.net
	Westech Building Products, Inc.	  	USA	  	napg.us
	Westech Building Products, Inc.	  	USA	  	napl.com
	Westech Building Products, Inc.	  	USA	  	naprofiles.com
	Westech Building Products, Inc.	  	USA	  	naprofilesgroup.com
	Westech Building Products, Inc.	  	USA	  	northamericanprofiles.com
	Westech Building Products, Inc.	  	USA	  	northamericanprofilesgroup.com
	Westech Building Products, Inc.	  	USA	  	wbpl.com
	Westech Building Products, Inc.	  	USA	  	wbpl.net
	Westech Building Products, Inc.	  	USA	  	westechbp.com
	Westech Building Products, Inc.	  	USA	  	westechbp.net
	Westech Building Products, Inc.	  	USA	  	westechbuildingproduct.com
	Westech Building Products, Inc.	  	USA	  	westechfence.com
	Westech Building Products, Inc.	  	USA	  	trugrainbp.com
	Westech Building Products, Inc.	  	USA	  	tru-grain.com
	Westech Building Products, Inc.	  	Canada	  	napg.ca
	Westech Building Products, Inc.	  	Canada	  	wbpl.ca
	Westech Building Products, Inc.	  	Canada	  	westechbp.ca
	North American Pipe Corporation	  	USA	  	freedomplastics.com
	North American Specialty Products	  	USA	  	certaframe.com
	North American Specialty Products	  	USA	  	certa-lok.com

  

					
		 	48	 	Schedule 6.9

					
	 Owner
	  	 County / Region
	  	 Domain Name

	North American Specialty Products	  	USA	  	certa-lok.net
	North American Specialty Products	  	USA	  	certa-lok.org
	North American Specialty Products	  	USA	  	certalok.com
	North American Specialty Products	  	USA	  	certalok.org
	North American Specialty Products	  	USA	  	certa-set.com
	North American Specialty Products	  	USA	  	certaset.com
	North American Specialty Products	  	USA	  	certainteedfoundations.com
	North American Specialty Products	  	USA	  	certainteedfoundationsysems.com
	North American Specialty Products	  	USA	  	straightshotpipe.com
	North American Specialty Products	  	USA	  	thermaeze.com
	North American Specialty Products	  	USA	  	tileguard.com
	North American Specialty Products	  	USA	  	trenchlesspcv.com

  

					
		 	49	 	Schedule 6.9

 SCHEDULE 6.10 

TRADE NAMES 
  

			
	1.	  	Driptech, Inc.
		
	2.	  	Geismar Holdings, Inc.
		
	3.	  	GVGP, Inc.
		
	4.	  	North American Pipe Corporation
		
	5.	  	North American Specialty Products LLC
		
	6.	  	Suzhou Huasu Plastics Co., Ltd.
		
	7.	  	Westech Building Products, Inc.
		
	8.	  	Westech Building Products ULC
		
	9.	  	Westech (Shanghai) Equipment Leasing Co., Ltd.
		
	10.	  	Westlake Chemical (Asia) Inc.
		
	11.	  	Westlake Chemical (China) Corporation
		
	12.	  	Westlake Chemical Corporation
		
	13.	  	Westlake Chemical Investments, Inc.
		
	14.	  	Westlake Development Corporation
		
	15.	  	Westlake Ethylene Pipeline Corporation
		
	16.	  	Westlake Geismar Power Company
		
	17.	  	Westlake International I B.V.
		
	18.	  	Westlake International II B.V.
		
	19.	  	Westlake International Holdings Cooperatief U.A.
		
	20.	  	Westlake International Holdings C.V.
		
	21.	  	Westlake International Investments Corporation
		
	22.	  	Westlake International LLC
		
	23.	  	Westlake International Services Corporation
		
	24.	  	Westlake Longview Corporation
		
	25.	  	Westlake Management Services, Inc.
		
	26.	  	Westlake NG I Corporation
		
	27.	  	Westlake NG IV Corporation
		
	28.	  	Westlake NG V Corporation
		
	29.	  	Westlake Olefins Corporation
		
	30.	  	Westlake Petrochemicals LLC
		
	31.	  	Westlake Pipeline Investments LLC
		
	32.	  	Westlake Polymers LLC
		
	33.	  	Westlake PVC Corporation
		
	34.	  	Westlake Resources Corporation
		
	35.	  	Westlake Styrene LLC
		
	36.	  	Westlake Supply and Trading Company
		
	37.	  	Westlake Trinidad Unlimited
		
	38.	  	Westlake Veba Trust
		
	39.	  	Westlake Vinyl Corporation

  
 Schedule 6.10 

			
	40.	  	Westlake Vinyls Company LP
		
	41.	  	Westlake Vinyls, Inc.
		
	42.	  	WPT LLC

  

					
		  	2	  	Schedule 6.10

 SCHEDULE 6.11 

LITIGATION 
 None. 

  
 Schedule 6.11 

 SCHEDULE 6.12 

LABOR DISPUTES 
 (a), (b) The
following lists collective bargaining agreements or other labor contracts and their term expiration dates: 
  

							
	 CONTRACT

EXPIRATION

DATE
	  	 FACILITY
LOCATION
	  	 UNION AFFILIATION
	  	 OBLIGATED

PARTY

	October 31, 2014	  	Calvert City, KY	  	International Association of Machinists and Aerospace Workers	  	Westlake Vinyls, Inc.,
	October 31, 2014	  	Calvert City, KY	  	International Association of Machinists and Aerospace Workers	  	Westlake Vinyls, Inc.
	December 6, 2014	  	Calvert City, KY	  	United Steel, Paper and Forestry, Manufacturing, Energy, Allied Industries and Service Workers International Union	  	Westlake PVC Corporation

 (c) None 
 (d) None 

  
 Schedule 6.12 

 SCHEDULE 6.13 

ENVIRONMENTAL LAW 
  

	(a)	EPA Audit of Ethylene Units in Lake Charles. During 2007, the U.S. Environmental Protection Agency, or EPA, conducted an audit of the Company’s ethylene units in Lake Charles, Louisiana, with a focus on leak
detection and repair, or LDAR. By letter dated January 31, 2008, the U.S. Department of Justice, or DOJ, notified the Company that the EPA had referred the matter to the DOJ to bring a civil case against the Company alleging violations of
various environmental laws and regulations. The DOJ informed the Company that it would seek monetary penalties and require the Company to implement an “enhanced LDAR” program for the ethylene units. The Company’s representatives are
negotiating a possible settlement with EPA. While the Company can offer no assurance as to an outcome, the Company believes that the resolution of this matter will not have a material adverse effect on the Company’s financial condition, cash
flows or results of operations. 

  

	(b)	The items disclosed in paragraph (a) include investigation or resolution of alleged non-compliances with permits and are incorporated by reference. 

 

	(c)	The items disclosed in paragraph (a) include investigation or resolution of Releases and are incorporated by reference. In addition, the following items are disclosed: 

 

	 	•	 	The soil and groundwater at the Company’s manufacturing complex in Calvert City is contaminated primarily by EDC and mercury. The contamination is being investigated pursuant to a Remedial Investigation and
Feasibility Study conducted by Goodrich, PolyOne and the Company. PolyOne is paying the costs of the investigation pursuant to a 2007 Settlement Agreement. The groundwater is being remediated by PolyOne pursuant to a RCRA permit. 

 

	 	•	 	The soil and groundwater at the Company’s manufacturing complex in Geismar is contaminated primarily with EDC. The groundwater is being remediated by Borden Chemicals, Inc. pursuant to a Settlement Agreement
between Borden and the federal Environmental Protection Agency and the Louisiana Department of Environmental Quality. 

  

	 	•	 	Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify
the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company’s operations. The soil and groundwater at the
complex, which does not include the Company’s nearby PVC facility, had been extensively contaminated by Goodrich’s operations. In 1993, Goodrich spun off the predecessor of PolyOne, and that predecessor assumed Goodrich’s
indemnification obligations relating to preexisting contamination. 

  

	 	•	 	 In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site.
The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits
from third parties, incurred with respect 

  
 Schedule 6.13 

	 	 
to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five
years), institute a proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company’s provision to or on behalf of PolyOne of
certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex consisting of a Remedial Investigation and Feasibility Study are being conducted under the jurisdiction of EPA
pursuant to an Administrative Order on Consent executed in 2009 by Goodrich, PolyOne and the Company. On March 17, 2010 PolyOne filed a notice of arbitration pursuant to which it seeks reimbursement of costs related to removal of mercury
contaminated soil of approximately $1.45 million. The arbitration is currently stayed while Goodrich and PolyOne pursue an insurance claim for those costs. 

  

	(d)	The items disclosed in paragraphs (a) and (c) are incorporated by reference. 

  

	 	•	 	Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky
Environmental and Public Protection Cabinet (“Cabinet”) re-issued Goodrich’s Resource Conservation and Recovery Act, or RCRA, permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both
Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich’s clean-up obligations under the permit to the Company. All of these administrative proceedings have been consolidated. The case has been continued and
a status conference is scheduled for January, 2012. 

  

	 	•	 	Monetary Relief. Except as noted above, with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, neither the court, the Kentucky Cabinet, nor EPA has established any
allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. The Company is not in a position at this time to state what effect, if any, the resolution of these
proceedings could have on the Company’s financial condition, results of operations, or cash flows in 2008 and later years. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the
complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

  

	(e)	The items disclosed in paragraphs (a) and (c) are incorporated by reference. 

  

	(f)	The items disclosed in paragraphs (a) and (c) are incorporated by reference. 

  

	(g)	The items disclosed in paragraphs (a) and (c) are incorporated by reference. 

  

	(h)	The items disclosed in paragraph (c) are incorporated by reference. 

  

	(i)	The items disclosed in paragraph (c) are incorporated by reference. 

  

					
		 	2	  	Schedule 6.13

 SCHEDULE 6.16 

ERISA COMPLIANCE 
 None. 

  

					
		 		 	Schedule 6.16

 SCHEDULE 6.23 

LOCATIONS OF COLLATERAL 
 See
attached. 

  

					
		 		 	Schedule 6.23

															
	 Location Name
	 	 Location Address
	 	 	 	 City, State, Zip
	 	 Code
	 	 Group
	 	 (Owned/Leased)
	 	 of Inventory

	Westlake Styrene LP	 	900 Hwy 108	 	LALC	 	Sulphur, LA 70665	 	US12	 	Olefins	 	Owned	 	Benzene (RM) Styrene (FG) CoProducts
	Kinder Morgan (Queen City)	 	3806 Kellog Ave.	 	OHCI	 	Cincinnatti, OH 45226	 	US12	 	Olefins	 	Dom Bulk Terminal	 	Styrene (FG)
	A.O.C. (CAVA)	 	19991 Seaton Ave.	 	CAVA	 	Perris, CA 92570	 	US12	 	Olefins	 	Dom Bulk Terminal	 	Styrene (FG)
	Westlake Polymers, LP	 		 	LALC	 	Sulphur, LA 70665	 	US14	 	Olefins	 	In-Transit	 	Vinyl acetate (RM),
	Westlake Polymers, LP	 	FG to customer(s)	 	LALC	 	Sulphur, LA 70665	 	US14	 	Olefins	 	In-Transit	 	Polyethylene (FG)
	Westlake Polymers, LP	 	3525 Cities Service Hwy	 	LALC	 	Sulphur, LA 70665	 	US14	 	Olefins	 	Owned	 	Vinyl acetate (RM),
		 	 AKRON, OH
	 	OHAK	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 ALEXANDRIA, LA
	 	LAAL	 		 	US14	 	Olefins	 	SIT	 	Polyethylene (FG)
		 	 APPLETON, WI
	 	WIAP	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 ASHEBORO, NC
	 	NCAS	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Augusta, KY
	 	KYAU	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 BAYTOWN, TX Dom
	 	TXBT	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 Bowling Green,KY
	 	KYBO	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Carol Stream, IL
	 	ILPP	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 CARROLLTON, TX
	 	TXCA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Centerville, IA
	 	IACN	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 CHESAPEAKE, VA
	 	VACH	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 CHINO, CA
	 	CACH	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Danville, VA
	 	VADA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 EDISON, NJ
	 	NJED	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 EXEL BAYTOWN, TX
	 	TXBY	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 EXPORT WHS TXLP
	 	TXLP	 		 	US14	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	 Ft. Worth (A&R)
	 	TXDF	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 Grand Prair SILO
	 	TXG2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Grand Prairie,TX
	 	TXGP	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Guanajuato, MX
	 	MXGU	 	Foreign	 	US14	 	Olefins	 	Foreign	 	Polyethylene (FG)
		 	 HAMILTON, ON CAN
	 	ONHA	 	Foreign	 	US14	 	Olefins	 	Foreign	 	Polyethylene (FG)
		 	 HD Services/DOM
	 	TXW1	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 HOUSTON INTERPAK
	 	TXIP	 		 	US14	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	 IOWA PARK SILO
	 	TXI2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 IOWA PARK, TX
	 	TXIO	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Joliet, IL
	 	ILJO	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 La Porte,TX Pack
	 	TXW2	 		 	US14	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	 Lachine, PQ
	 	PQLA	 	Foreign	 	US14	 	Olefins	 	Foreign	 	Polyethylene (FG)
		 	 Lk Charles Prod
	 	LAPR	 		 	US14	 	Olefins	 	WIP Location	 	Polyethylene (FG)
		 	 Louisville SILO
	 	KYL2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Louisville, KY
	 	KYLO	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Madera, CA
	 	CAMA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Mankato, MN
	 	MNMA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 MATTHEWS, NC
	 	NCMA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Montgomery, AL
	 	ALMT	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Montreal Quebec
	 	PQMO	 	Foreign	 	US14	 	Olefins	 	Foreign	 	Polyethylene (FG)

  

					
		  	1	  	Schedule 6.23

															
		 	 Morris, IL
	 	ILMO	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 Neenah, WI
	 	WINE	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 New London, WI
	 	WIPS	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 New London, WI
	 	WINL	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Nomacorc Silo1
	 	NCN1	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Nomacorc Silo2
	 	NCN2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Nomacorc Silo3
	 	NCN3	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Nomacorc Silo4
	 	NCN4	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 OSHKOSH-CUR/MOS
	 	WIOH	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 OSHKOSH, WI-BxF
	 	WIOK	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 OSHKOSH, WI-MON
	 	WIOS	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Pacific Ch Dist
	 	6Y01	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 PITTSTON, PA
	 	PAPT	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 POTTSVILLE, PA
	 	PAPO	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 PRESTO,UT
	 	UTPR	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Raritan,NJ
	 	NJEN	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 Rogers, AR
	 	ARRO	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 ROGERS, AR
	 	ARRG	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 SENECA, SC
	 	SCSE	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 SENECA, SC SILO
	 	SCS2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 SENOIA, GA
	 	GASE	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Simpsonvile silo
	 	6K02	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 Simpsonville, SC
	 	6K01	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 SOUTH BOSTON,VA
	 	VASB	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Sparta, MI
	 	MISP	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 St. Joseph Silo
	 	MOS2	 		 	US14	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 	 ST. PAUL, MN
	 	MNSP	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 STERRETT, TX
	 	TXST	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 SUPERIOR, WI
	 	WISU	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 TERRE HAUTE, IN
	 	INTH	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 TRURO, NS
	 	NSTR	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 TULSA, OK AEP
	 	OKTL	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 W L CHARLES, LA
	 	LALC	 		 	US14	 	Olefins	 	SIT	 	Polyethylene (FG)
		 	 Ware, MA
	 	MAW1	 		 	US14	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 WARE, MA
	 	MAWA	 		 	US14	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 Westfield, MA
	 	MAWE	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 WEYAUWEGA,WI
	 	WIWE	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 WINNIPEG, MB
	 	MBWP	 	Foreign	 	US14	 	Olefins	 	Foreign	 	Polyethylene (FG)
		 	 YAKIMA, WA
	 	WAYA	 		 	US14	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Targa (Dynegy)	 	DYHB on Davison Rd	 	DYHB	 	Hackberry, LA 70665	 	US15	 	Olefins	 	Feedstock Storage	 	Ethane, Propane, Contained Ethane & Propane
	Enterprise	 	FM 1942	 	ENMB	 	Mt Belvieu, TX 77580	 	US15	 	Olefins	 	Feedstock Storage	 	Ethane, Propane, Contained Ethane & Propane
	Boardwalk	 	Cavern = Salt dome = well	 	LAPL	 	Sulphur, LA 70665	 	US15	 	Olefins	 	Feedstock Storage	 	Ethane, Propane, Contained Ethane & Propane
	Kinder Morgan Pipeline	 	Pipeline	 	LALC	 	In a pipeline from Mt Belvieu to Lake Charles, LA	 	US15	 	Olefins	 	Feedstock Storage	 	Ethane, Propane, Contained Ethane & Propane

  

					
		  	2	  	Schedule 6.23

															
	Oneok Hydrocarbon, LP	 	Pipeline	 	OKMB	 	In a pipeline from Mt Belvieu to Lake Charles, LA	 	US15	 	Olefins	 	Feedstock Storage	 	Ethane, Propane, Contained Ethane & Propane
	Boardwalk	 	Pipeline	 	BWCH	 	Plaquemine, LA 70764	 	US15	 	Olefins	 	FG Storage	 	Ethylene (fg)
	WPT1	 	900 Hwy 108	 	LALC	 	Sulphur, LA 70665	 	US15	 	Olefins	 	Owned	 	Co-Products in RR
	Westlake PVC Corp.	 	230 Johnson Riley Road	 	KYCC	 	Calvert City, KY 42029	 	US19	 	Vinyls	 	Owned	 	VCM (rm), PVC resin
	Wexford	 		 	UTNe	 	Nephi, UT	 	US19	 	Vinyls	 	Cust. Controlled LT	 	PVC resin
	WLK leasetrack	 	Grand Elk RR	 	MIGR	 	Grand Rapids, MI 49507	 	US19	 	Vinyls	 	WLK Controlled LT	 	PVC resin
	The International Group, Inc	 	Highway 146 North	 	TXBY	 	Baytown, TX 77521	 	US19	 	Vinyls	 	Domestic WH	 	PVC resin
	Packwell Export WHS	 	350 Portwal	 	TXPP	 	Houston, TX 77029	 	US19	 	Vinyls	 	Export WH	 	PVC resin
	EXPORT Warehouse	 	france road parkway	 	NOLA	 	New Orleans, LA 70126	 	US19	 	Vinyls	 	Export WH	 	PVC resin (fg)
	IPEX-ST. JOSEPHDEBEA	 	SORTIN Yard	 	PQMO	 	Montreal QC H8S 4J7	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	IPEX	 	MacMillan Yard Station 41978	 	ONTO	 	IPEX-Mississuaga, ON	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	IPEX	 	6665 Chemin St-Francois	 	PQST	 	IPEX-St Laurent ON	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	IPEX	 	Edmonton RR, Township Rd #534	 	ABED	 	Edmonton, AB T58A 4V3	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	Kaytec	 	foreign	 	ONCA	 	Calgary, Ontario Canada	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	Kaytec	 	400 Longwood Road South	 	ONHM	 	Hamilton, ON L5J 1J9	 	US19	 	Vinyls	 	Foreign	 	PVC resin
	WLK leasetrack	 	South Plainsfield leasetrack	 	NJSP	 	South Plainsfield, NJ 07080	 	US19	 	Vinyls	 	WLK Controlled LT	 	PVC resin
	WLK leasetrack	 	Paducah & Louisville Railyard	 	KYPA	 	Paducah, KY 42001	 	US19	 	Vinyls	 	WLK Controlled LT	 	PVC resin
	Westlake Monomers	 	RM In-transit from vendor	 		 	Missippi River	 	US20	 	Vinyls	 	In-Transit	 	EDC Mix (rm)
	Westlake Monomers	 	2672 Industrial Parkway	 	KYCA	 	Calvert City, KY 42029	 	US20	 	Vinyls	 	Owned	 	CL2 (rm) EDC mix (rm), VCM (fg)
	Westlake Monomers	 	In-transit from vendor	 		 	In-transit to WMC from Georgia Gulf	 	US20	 	Vinyls	 	In-Transit	 	VCM (fg)
	NAPCO	 	725 Industrial Drive	 	0105NAPCO Litchfield-PVC	 	Litchfield, IL 62056	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	401 Industrial Park Road	 	0103NAPCO Booneville-PVC	 	Boonesville, MS 38829	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	500 Bloomfield Rd.	 	0106NAPCO Springfield-PVC	 	Springfield, KY 40069	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	603 South 28th Street	 	0102NAPCO Van Buren-PVC	 	Van Buren, AR 72956	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	3348 Industrial Drive	 	0101NAPCO Wichita Falls-PVC	 	Wichita Falls, TX 76305	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	E. Vistula	 	0107NABCO Bristol PVC	 	Bristol, IN 46507	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	Newport Road	 	0808NABCO Leola CPVC	 	Leola, PA 17540	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	Airport Road	 	0109NABCO Greensboro PVC	 	Greensboro, GA 30642	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 	230 Johnson Riley Road	 	0111NAPCO Calvert City-PVC	 	Calvert City, KY 42029	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 		 	0112NAPCO Calvert City-PVC	 	Yucca Plant	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPCO	 		 	0113NAPCO	 	Janesville, WI 53547	 	US21	 	Fabrications	 	Owned	 	Resin (rm), PVC
	Shell	 	Shell in Mt Belvieu, TX	 	SHEL	 	Mt Belvieu, TX 77580	 	US27	 	Olefins	 	FG Storage	 	Ethylene (fg)
	Williams	 	Williams in Mt Belvieu, TX	 	WMMB	 	Mt Belvieu, TX 77580	 	US27	 	Olefins	 	FG Storage	 	Ethylene (fg)
	WPT2	 	900 Hwy 108	 	LALC	 	Sulphur, LA 70665	 	US27	 	Olefins	 	Owned	 	Ethylene (fg)
	WPT2	 	900 Hwy 108	 	LALC	 	Sulphur, LA 70665	 	US27	 	Olefins	 	Owned	 	Co-Products
	Westech Fence	 	Evansville - 7451 Hwy. 62 E	 	INEV	 	Evansville, IN 47620	 	US28	 	Fabrications	 	Owned	 	Resin (rm), PVC
	Westech Fence	 	Evansville - 7451 Hwy. 62 E	 	INMV	 	Mt. Vernon, IN 47620	 	US28	 	Fabrications	 	Owned	 	Resin (rm), PVC
	WPE	 	In-transit from vendor	 	LALC	 	Sulphur, LA 70665	 	US29	 	Olefins	 	In-Transit	 	Butene(rm)/Hextene(rm)
	WPE	 	Customer ownership not taken	 	LALC	 	In-Transit	 	US29	 	Olefins	 	In-Transit	 	Polyethylene (FG)
	Westlake Polymers, LP	 	3525 Cities Service Hwy	 	LALC	 	Sulphur, LA 70665	 	US29	 	Olefins	 	Owned	 	Butene(rm)/Hextene(rm)
		 	 ALEXANDRIA, LA
	 	LAAL	 		 	US29	 	Olefins	 	 SIT
	 	Polyethylene (FG)
		 	 BAYTOWN, TX Dom
	 	TXBT	 		 	US29	 	Olefins	 	 Domestic WH
	 	Polyethylene (FG)
		 	 Bowling Green,KY
	 	KYBO	 		 	US29	 	Olefins	 	 Cust. Controlled LT
	 	Polyethylene (FG)

  

					
		  	3	  	Schedule 6.23

															
		 	 Carol Stream, IL
	 	 ILPP
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 CHINO, CA
	 	 CACH
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 COLLEGE PARK, GA
	 	 GACP
	 		 	US29	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 DANVILLE, VA
	 	 VADA
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 EASTMAN, GA
	 	 GAEA
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 EXEL BAYTOWN, TX
	 	 TXBY
	 		 	US29	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 EXPORT WHS TXLP
	 	 TXLP
	 		 	US29	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	 HD Services/DOM
	 	 TXW1
	 		 	US29	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	 JACKSONVILLE, IL
	 	 ILJE
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 JACKSONVILLE, IL
	 	 ILJW
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 La Porte,TX Pack
	 	 TXW2
	 		 	US29	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	 Lk Charles Prod
	 	 LAPR
	 		 	US29	 	Olefins	 	WIP Location	 	Polyethylene (FG)
		 	 MATTHEWS, NC
	 	 NCMA
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Montgomery, AL
	 	 ALMT
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 MOSSVILLE, LA
	 	 LAMS
	 		 	US29	 	Olefins	 	SIT	 	Polyethylene (FG)
		 	 OSHKOSH, WI-BxF
	 	 WIOK
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 OSHKOSH, WI-MON
	 	 WIOS
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 PITTSTOWN, PA
	 	 PAPT
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Raritan,NJ
	 	 NJEN
	 		 	US29	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	 Rogers, AR
	 	 ARRO
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 Sparta, MI
	 	 MISP
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 STERRETT, TX
	 	 TXST
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 TAYLORSVILLE, NC
	 	 NCTY
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 TEMPLE, TX
	 	 TXTE
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 TERRE HAUTE, IN
	 	 INTH
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	 W LK CHARLES, LA
	 	 LALC
	 		 	US29	 	Olefins	 	SIT	 	Polyethylene (FG)
		 	 WEST HAZELTON,PA
	 	 PAWH
	 		 	US29	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	WCA&O Corp.	 	2468 Industrial Pkwy.	 	KYCC	 	Calvert City, KY 42029	 	US30	 	Vinyls	 	Feedstock Storage	 	Propane (rm)
	TE Pipeline Product Co. (TEPPCO )	 	10343 FM 1942/PO Box 2521	 	TET	 	Mt Belvieu, TX 77580	 	US30	 	Vinyls	 	Feedstock Storage	 	Propane (rm)
	WCA&O Corp.	 	2468 Industrial Pkwy.	 	KYCC	 	Calvert City, KY 42029	 	US30	 	Vinyls	 	Owned	 	salt (rm), Co-products (fg)
	J.D. Street	 	One River Road	 	MOST	 	St. Louis, MO 63125	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	Port of Guntersville	 	Foot of Worth Street	 	ALGU	 	Guntersville, AL 35976	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	
	Transmontaigne Terminaling	 	20 Jackson St.	 	INNA	 	New Albany, IN 47150	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	Brenntag/Southside Terminal	 	Southside Avenue	 	OHCI	 	Cincinnatti, OH 45204	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	Brenntag Mid-South	 	Milepost 43.15 Kanawha River	 	WVNI	 	Nitro, WV 25143	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	IMTT	 	13589 Main St.	 	ILLE	 	Lemont, IL 60439	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	Brenntag SW	 		 	TXBP	 	Bayport, TX 77507	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
		 		 	LABW	 	Blackwater, LA	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	Kinder Morgan (Delta Terminal Services)	 	3640 River Road	 	LAHA	 	Harvey, LA 70058	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
		 		 	LABW	 	Blackwater, LA	 	US30	 	Vinyls	 	Dom Bulk Terminal	 	Caustic soda (fm)
	WCA&O	 	FG to customer(s)	 		 	various	 	US30	 	Vinyls	 	In-Transit	 	Co-Products in RR
	Westlake Longview Corp	 	Highway 149, Kodak Blvd 75603	 	TXEX	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	(RM), Epolene (FG)
	CDF Warehouse (or Exel Warehouse)	 	2021 Callahan Road, Longview 75602	 	CW	 	Longview, TX 75602	 	US33	 	Olefins	 	Domestic WH	 	Epolene (FG)

  

					
		  	4	  	Schedule 6.23

															
	EP-Excel Domestc	 	2021 Callahan Road, Longview 75602	 	41	 	Longview, TX 75602	 	US33	 	Olefins	 	Domestic WH	 	Epolene (FG)
	Epolene- Excel Ex	 	2021 Callahan Road, Longview 75602	 	42	 	Longview, TX 75602	 	US33	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 		 	SUB	 	SubContractors	 	US33	 	Olefins	 	Owned	 	Epolene (FG)
	Westlake Longview Corp	 	Highway 149, Kodak Blvd 75603	 	TXEX	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	(RM), Epolene (FG)
	Non-WM	 	Highway 149, Kodak Blvd 75603	 	01	 	Longview, TX 75603	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Epolene (FG)
	Epolene Bins	 	Highway 149, Kodak Blvd 75603	 	EB	 	Longview, TX 75603	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Epolene (FG)
	Epolene Bulk	 	Highway 149, Kodak Blvd 75603	 	EPBU	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Epolene (FG)
	Epolene Samples	 	Highway 149, Kodak Blvd 75603	 	EM	 	Longview, TX 75603	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Epolene (FG)
	Epolene Staging	 	Highway 149, Kodak Blvd 75603	 	ES	 	Longview, TX 75603	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Epolene (FG)
	Great Walton RR	 		 	F301	 	Houston, TX 77001	 	US33	 	Olefins	 	SIT	 	Epolene (FG)
	ICO Polymers	 	Highway 149, Kodak Blvd 75603	 	ZICO	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	Epolene (FG)
		 		 	SUB	 	SubContractors	 	US33	 	Olefins	 	Owned	 	Epolene (FG)
	Westlake Longview Corp	 	Highway 149, Kodak Blvd 75603	 	TXEX	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	(RM)
	Tyler Well	 	3041 North NE Loop 323	 	Tywell	 	Tyler, TX 75708	 	US55	 	Olefins	 	Feedstock Storage	 	Ethylene in Well
	Westlake Longview Corp	 	Highway 149, Kodak Blvd 75603	 	TXEX	 	Longview, TX 75603	 	US55	 	Olefins	 	Feedstock Storage	 	Ethylene pipeline
	Cotter Warehouse Terminal / Akron Express Trucker	 	Firestone Parkway Cotter Merchandise Storage Company	 	OHAK	 	Akron, OH 44309	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	Alcoa Consumer Products	 	North Perkins Street	 	WIAP	 	Appleton, WI 54914	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	KYAU	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	BROKEN ARROW	 	OKBA	 	BROKEN ARROW	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	BU-PE-1/PEP RC	 	Highway 149, Kodak Blvd 75603	 	7B	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	Polyethylene (FG)
	BU-PE-2 Blk RC&T	 	Highway 149, Kodak Blvd 75603	 	7C	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	Polyethylene (FG)
	BU-PE-3 Blk RC&T	 	Highway 149, Kodak Blvd 75603	 	7D	 	Longview, TX 75603	 	US33	 	Olefins	 	Owned	 	Polyethylene (FG)
	BU-PEP Blk Trk	 	Highway 149, Kodak Blvd 75603	 	BUTR	 	Longview, TX 75603	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	Pax Terminal	 	Pax Terminal, A42 Tryon Street	 	NCCH	 	Charolette, NC 28214	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 		 	CACH	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	GACP	 	College Park, GA	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	The International Group, Inc	 	Highway 146 North	 	TXBY	 	Baytown, TX 77521	 	US33	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
	Packwell Export WHS	 	10016 Porter Street	 	TXLP	 	LA PORTE, TX 77571	 	US33	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	168 Northfirld Avenue	 	NJED	 	Edison, NJ 08837	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	Epolene	 	Highway 149, Kodak Blvd 75603	 	70	 	Longview, TX 75603	 	US33	 	Olefins	 	WIP Location	 	Polyethylene (FG)
		 		 	TXVL	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	TXDF	 		 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	SA for Durbin	 	Carretera Panamericana	 	MXGU	 	Guanajuato, MX 36100	 	US33	 	Olefins	 	Foreign	 	Polyethylene (FG)
	Packwell	 	7703 Cannon Yard	 	TXW1	 	Houston, TX 77021	 	US33	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
	John Grant Haulage, LTD	 	Longwood Road South	 	ONHA	 	Hamilton, ON L8N 4B6	 	US33	 	Olefins	 	Foreign	 	Polyethylene (FG)
	Cryovac, Inc SILO	 	1301 West Magnolia Ave	 	TXI2	 	Iowa Park, TX 76367	 	US33	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
	Cryovac, Inc	 	1301 West Magnolia Ave	 	TXIO	 	Iowa Park, TX 76367	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	ILJW	 	Jacksonville, IL 62650	 	us33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	PACTIV	 	E Morton Road	 	ILJE	 	Jacksonville, IL 62650	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	4001 Olympic BLVD	 	ILJO	 	Joliet, IL60431	 	US33	 	Olefins	 	Domestic WH	 	Polyethylene (FG)
		 	1705 Kansas Avuenue	 	KSAT	 	Kansas City KS 66105	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	1705 Kansas Avuenue	 	KSAF	 	Kansas City KS 66105	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)

  

					
		  	5	  	Schedule 6.23

															
	Liquid Transport Terminal / Liquid Transport Trucker	 	West 3rd Street	 	MOKC	 	Kansas City MO 64105	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 		 	TXW2	 		 	US33	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	13 industrial park	 	PALE	 	Lewistown, PA 17044	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	WALV	 	Longview, WA	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	4505 OLD LAMAR AVE	 	TNMP	 	Memphis, TN 38118	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Westlake Longview Corp	 	Cavendish Blvd @ Taschereau Yard	 	PQMO	 	Montreal, QC H4A 1T1	 	US33	 	Olefins	 	Foreign	 	Polyethylene (FG)
	A&R Transport Terminal / A&R Transport Truckers	 	A&R Transport on N Tabler Rd	 	ILMO	 	Morris, IL 60450	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	CLOPAY	 	463 Harding Industry	 	TNNS	 	Nashville TN 37211	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	CURWOOD	 	718 High Street	 	WINL	 	New London, WI 54961	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Bemis Film	 	OSHKOSH, WI-BxF	 	WIOK	 	Oshkosh, WI 54904	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Milprint North	 	OSHKOSH, WI-MON	 	WIOS	 	Oshkosh, WI 54904	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	On-site rail storage	 	Highway 149, Kodak Blvd 75603	 	PERC	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	PE Inv @LV WH	 	LV WHS #55061 1601 W Cotton Street, Longview 75604	 	7L	 	Longview, TX 75604	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	PE Processing	 	Highway 149, Kodak Blvd 75603	 	71	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	PE-1 Raw Mtl Storage	 	Highway 149, Kodak Blvd 75603	 	70R	 	Longview, TX 75603	 	US33	 	Olefins	 	WIP Location	 	Polyethylene (FG)
	PE-2 Department	 	Highway 149, Kodak Blvd 75603	 	74	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	PE-3 Department	 	Highway 149, Kodak Blvd 75603	 	75	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	PE-3 Raw Mtl Storage	 	Highway 149, Kodak Blvd 75603	 	75R	 	Longview, TX 75603	 	US33	 	Olefins	 	WIP Location	 	Polyethylene (FG)
	PEP Raw Mtl Storage	 	Highway 149, Kodak Blvd 75603	 	71R	 	Longview, TX 75603	 	US33	 	Olefins	 	WIP Location	 	Polyethylene (FG)
	AEP Industries	 	AEP Industries @ Track 650	 	PAPT	 	Pittstown, PA	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	PK-PE PK Inv/Car	 	Highway 149, Kodak Blvd 75603	 	7A	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	Alcoa	 	Alcoa, East on 200 South (Lewison)	 	UTPR	 	Presto, UT 84320	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Pacific Chemical Distribution / Pacific Bulk Transportation Co	 	6250 Caballero Blvd.	 	6Y01	 	Anaheim, CA 92806	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 		 	OKPV	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	5201 Fairfield Road	 	ARPB	 	Pine Bluff, AR 71601	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Plastics Lab	 	Highway 149, Kodak Blvd 75603	 	51	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	Rail car on yard	 	Highway 149, Kodak Blvd 75603	 	99	 	Longview, TX 75603	 	US33	 	Olefins	 	SIT	 	Polyethylene (FG)
	WLK leasetrack	 	Raritan Central railway FWD Storage	 	NJEN	 	Raritan, NJ 08817	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 	3033 East 16th Street	 	ARRU	 	Russellville, AR 72802	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Alcoa	 	Alcoa @ Highway 58	 	VASB	 	South Boston, VA 24592	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Plastics Express	 	678 Transfer Road	 	MNSP	 	St. Paul, MN 55114	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
		 		 	MXSA	 		 	US33	 	Olefins	 	Export WH	 	Polyethylene (FG)
		 	450 S Benton, Searcy AR 72143	 	ARSC	 	Searcy, AR 72143	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Sealed Air SILO	 	803 North Maple Street	 	6K02	 	Simpsonville, SC 29681	 	US33	 	Olefins	 	Consignment Cons.	 	Polyethylene (FG)
		 		 	NCTY	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	TXTE	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Bemis Film	 	Bemis Film - N. Fruitridge	 	INTH	 	Terre Haute, IN 47804	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	OKTL	 		 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
	Truck Rail Handling/Quality Transport	 	Truck Rail Handling, 2300 South 300 West	 	EJ01	 	Salt Lake City, UT 84157	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	A&R Transport Terminal / A&R Transport Truckers	 	A&R Transport on East street	 	MAWA	 	Ware, MA 01082	 	US33	 	Olefins	 	Dom Bulk Terminal	 	Polyethylene (FG)
	Norfolk S RR	 	Norfolk S RR ZTS Track#606 Zone 4	 	PAWH	 	West Hazelton, PA	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	WIWE	 	Weyauwega, WI 54983	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 	132 N ELM STREET	 	MAWE	 	Westfield, MA 01085	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)

  

					
		  	6	  	Schedule 6.23

															
	Westlake Polymers, LP	 	MBWP = Winpak	 	MBWP	 	Winnipeg, Manitoba, CANADA	 	US33	 	Olefins	 	Foreign	 	Polyethylene (FG)
	Washington Central RR	 	Middle Yard - Yard 40 Track 722	 	WAYA	 	Yakima, WA	 	US33	 	Olefins	 	Cust. Controlled LT	 	Polyethylene (FG)
		 		 	SUB	 	SubContractors	 	US33	 	Olefins	 	Owned	 	Polyethylene (FG)
	Westlake Longview Corp	 	FG to customer(s)	 	TXEX	 	Longview, TX 75603	 	US33	 	Olefins	 	In-Transit	 	Polyethylene (FG)
	GVC	 	2468 Industrial Pkwy.	 	LAGM	 	Geismar, LA 70734	 	US37	 	Vinyls	 	Owned	 	Chlorine (rm), VCM (rm), VCM (fg), EDC (fg), PVC (fg), Caustic (fg)
	Resin Tech	 	1802 South M Street	 	TXLA	 	La Porte, TX 77571	 	US37	 	Vinyls	 	Dom Bulk Terminal	 	PVC resin (fg)
		 		 	LAHO	 	Holden LA	 	US37	 	Vinyls	 	Cust. Controlled LT	 	PVC resin (fg)
	Kaytec	 	400 Longwood Road South	 	ONHM	 	Hamilton, ON L5J 1J9	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	IPEX	 		 	ONST	 	St Laurent ON	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	IPEX-SCARBOROUGH	 		 		 	Scarborough	 	US37	 	Vinyls	 	Cust. Controlled LT	 	PVC resin (fg)
	IPEX-PINEVILLE	 	10100 Rodney Street	 	NCPI	 	Pineville, NC 28134	 	US37	 	Vinyls	 	Cust. Controlled LT	 	PVC resin (fg)
	IPEX	 	Edmonton RR, Township Rd #534	 	ABED	 	Edmonton, AB T58A 4V3	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	IPEX	 	1055 Wilton Grove Road	 	ONLO	 	London, ON N6N 1C9	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	IPEX	 		 		 	Lachine Montreal PQ	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	Aurora Plastic	 	180 Welcome Center blvd	 	NCCO	 	Colfax, NC 27374	 	US37	 	Vinyls	 	Cust. Controlled LT	 	PVC resin (fg)
	Resin Tech	 		 		 	Florence, AL	 	US37	 	Vinyls	 	Dom Bulk Terminal	 	PVC resin (fg)
	Aurora Plastic	 		 	OHST	 	Streetsboro, OH	 	US37	 	Vinyls	 	Dom Bulk Terminal	 	PVC resin (fg)
	Venezia Trucking	 	South Plainsfield leasetrack	 	NJSP	 	South Plainsfield, NJ 07080	 	US37	 	Vinyls	 	Dom Bulk Terminal	 	PVC resin (fg)
	SA for Durbin	 	Carretera Panamericana	 	MXGU	 	Guanajuato, MX 36100	 	US37	 	Vinyls	 	Foreign	 	PVC resin (fg)
	EXPORT Warehouse	 	france road parkway	 	LAND	 	New Orleans, LA 70126	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	EXPORT Warehouse	 	france road parkway	 	LANL	 	New Orleans, LA 70126	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	EXPORT Warehouse	 	france road parkway	 	NOLA	 	New Orleans, LA 70126	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	The International Group, Inc	 	Highway 146 North	 	TXBY	 	Baytown, TX 77520	 	US37	 	Vinyls	 	Domestic WH	 	PVC resin (fg)
	United DC - Lathrop	 	Export Warehouse on Lathrop Street	 	TXD2	 	Houston, TX 77020	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	Packwell Export WHS	 	8786 Wallisville Road	 	TXP1	 	Houston, TX 77029	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	Packwell Export WHS	 	350 Portwal	 	TXPP	 	Houston, TX 77029	 	US37	 	Vinyls	 	Export WH	 	PVC resin (fg)
	GVC	 	FG to customer(s)	 		 		 	US37	 	Vinyls	 	In-Transit	 	EDC (fg), VCM (rm) Chlorine (rm)
	Lodi California plant	 		 	6811	 	Lodi, California	 	US68	 	Fabrications	 	Owned	 	Resin (rm), PVC
	McPherson Kansas plant	 		 	6812	 	McPherson Kansas	 	US68	 	Fabrications	 	Owned	 	Resin (rm), PVC
	Greensboro Georgia warehouse	 		 	6814	 	Greensboro, GA	 	US68	 	Fabrications	 	Owned	 	Resin (rm), PVC
	Janesville Wisconsin warehouse	 		 	6816	 	Janesville, WI 53547	 	US68	 	Fabrications	 	Owned	 	Resin (rm), PVC
	McPherson Kansas plant	 		 	6822	 	McPherson Kansas	 	US68	 	Fabrications	 	Owned	 	Resin (rm), PVC
	NAPG	 	7504 30th Street, S.E.	 	CA36	 	Calgary, Alberta Canada	 	CA36	 	Fabrications	 	NOT INCLUDED	 	Resin, Window Frames
	Tyler Well	 	3041 North NE Loop 323	 	Tywell	 	Tyler, TX 75708	 	US55	 	Olefins	 	NOT INCLUDED	 	Ethylene in Well
	Westlake Ethylene Pipeline Corp	 		 	TXEX	 	Longview, TX 75603	 	US55	 	Olefins	 	NOT INCLUDED	 	Ethylene pipeline
	Spare Parts	 		 		 		 		 		 	Other	 	
	Additives & Non Recipe Chemicals	 		 		 		 		 		 	Other	 	
	Supplies - Gaskets, Lube, Intermediates, Lumber Strapping	 		 		 		 		 		 	Other	 	
	Other	 	Primarily Inventory exchange	 		 		 		 		 	Other	 	

  

					
		  	7	  	Schedule 6.23

															
	Inventory Reserve	 	Slow moving reserve against spare parts inventory	 		 		 		 		 	Other	 	
	Intercompany Profit Elimination	 		 		 		 		 		 	Other	 	
		 		 		 		 		 		 		 	
	Rounding/Variance	 		 		 		 		 		 	Other	 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
		 		 		 		 		 		 		 	
	Total Inventory	 		 		 		 		 		 		 	

  

					
		  	8	  	Schedule 6.23

 SCHEDULE 6.24 

DEPOSIT ACCOUNTS AS OF JULY 17, 2014 
  

					
	 BANK
	  	 ACCOUNT NAME
	  	 ACCOUNT NUMBER

	 Bank of America

Customer Connection
 Dallas, TX
75283-2406
	  	Westlake Chemical Corporation	  	3750232879
	Bank of America	  	Westlake Chemical Corporation – CDA	  	3299114316
	Bank of America	  	Westlake Management Services, Inc. - Payroll CDA	  	3299122996
	Bank of America	  	North American Pipe Corporation - Payroll CDA	  	3299123010
	Bank of America	  	Westlake Development Corporation	  	3751754673
	Bank of America	  	Westlake Vinyls Company LP	  	3752082807
	Bank of America	  	North American Pipe Corporation - Operating	  	3750480773
	Bank of America	  	Westech Building Products, Inc.	  	3750770111
	Bank of America	  	Westlake Vinyls, Inc. – Westlake CA&O - Operating	  	3750857597
	Bank of America	  	Westlake Vinyls, Inc. – Westlake Monomers Division	  	3750480731
	Bank of America	  	Westlake Management Services, Inc.	  	3750480757
	Bank of America	  	Westlake Petrochemicals LLC	  	3750480744
	Bank of America	  	Westlake Polymers LLC - Operating	  	3750480728
	Bank of America	  	Westlake PVC Corporation - Operating	  	3750480760
	Bank of America	  	Westlake Styrene LLC - Operating, Lockbox	  	3751000741
	Bank of America	  	Westlake Petrochemicals LLC - WPE Division	  	3750909487
	Bank of America	  	WPT LLC	  	3750692749
	Bank of America	  	Westlake Polymers LLC - Lockbox	  	3750860607
	Bank of America	  	Westlake PVC Corporation - Lockbox	  	3750889811
	Bank of America	  	Westlake Vinyls, Inc. - Westlake CA&O Lockbox	  	3751754660
	Bank of America	  	North American Pipe Corporation - Lockbox	  	3750232840
	Bank of America	  	Westlake Longview Corporation	  	4426358345
	Bank of America	  	Westlake Pipeline Investments LLC	  	4427135761
	Bank of America	  	Westlake Chemical Corporation FBO Bank of America as Collateral Pledgee Cash Collateral Account	  	4426869274
	Bank of America	  	Westlake Management Services – Benefits Account	  	3359866061
	Bank of America	  	Westlake Chemical OpCo LP	  	4427248904
	Bank of America	  	Westlake Chemical OpCo LP – CDA	  	3359996025
	Bank of America	  	North American Pipe Corporation - Yucca	  	4427708428
	Bank of America	  	North American Specialty Products LLC - Lodi	  	4427791338
	Bank of America	  	North American Specialty Products LLC - McPherson	  	4427791341
	Bank of America	  	North American Specialty Products LLC - Wayne	  	4427826038
	 Capital One

1312 South Burnside
 Gonzales, LA
70737
	  	Westlake Vinyls Company LP-Petty Cash	  	2080093333
	 Capital One

P.O. Box 61540
 New Orleans, LA
70161
	  	Westlake Petrochemicals LP - Petty Cash	  	01-020757-01

  

					
		 		 	Schedule 6.24

					
	 Community Financial Service Bank

PO. Box 467
 Benton, KY
42025
	  	Westlake Vinyls, Inc - Petty Cash	  	0503614
	 Heritage Bank

20 Oak Plaza Drive
 Calvert City, KY
42029
	  	North American Pipe Corporation - Petty Cash	  	620001593
	 Litchfield Bank & Trust

401 North Madison
 Litchfield, IL
62056
	  	North American Pipe Corporation - Petty Cash	  	00077666
	 BancorpSouth

207 S. 1st Street

Booneville, MS 38829
	  	North American Pipe Corporation – Petty Cash	  	60019452
	 The Farmers Bank

202 S. Main Street
 Greensboro, GA
30642
	  	North American Pipe Corporation - Petty Cash	  	0032623
	 Fifth Third Bank

Evansville, IN
	  	Westech Building Products Inc. - Petty Cash	  	7692084747
	 Texas Bank

P.O.Box 7789
 Longview, TX
75603
	  	Westlake Longview Corporation - Petty Cash	  	4212266
	 JPMorgan Chase Bank

18 N. Arch Street
 Janesville, WI
53548
	  	North American Pipe Corporation - Petty Cash	  	811663020
	 PNC Bank

16 East Main Street
 Leola , PA
17540
	  	North American Pipe Corporation - Petty Cash	  	5006165749

  

					
		 		 	Schedule 6.24

 SCHEDULE 7.10 

EXISTING INVESTMENTS 
  

	1.	Please see items listed in Schedule 7.13. 

  

	2.	100 shares of ordinary stock of Westlake Trinidad Unlimited by Westlake NG I Corporation. 

  

	3.	100 shares of common stock of Westlake International Services Corporation by Westlake Olefins Corporation. 

  

	4.	100 shares of common stock of Westlake Chemical (China) Corporation by Westlake Olefins Corporation. 

  

	5.	1 share of common stock of Westlake Chemical (Asia), Inc. by Westlake Chemical Corporation. 

  

	6.	100% of partnership interests in Westlake International Holdings C.V. by Westlake Olefins Corporation (general partner, owning approximately 56%) and Westech Building Products, Inc. (limited partner, owning
approximately 43%). 

  

	7.	100% membership interests in Westlake International LLC by Westlake International Holdings C.V. 

  

	8.	100% ownership interests in Westlake International Holdings Cooperatief U.A. by Westlake International Holdings C.V. (approximately 99%) and Westlake International LLC (less than 1%). 

 

	9.	100% ownership interests in Westlake International I B.V. by Westlake International Holdings C.V. 

  

	10.	100% ownership interests in Westlake International II B.V. by Westlake International I B.V. 

  

	11.	10,300,000 ordinary shares and 5,000,000 non-voting preferred shares in Westlake International Investments Corporation by Westlake International I B.V. 

 

	12.	100% ownership interests in Westech (Shanghai) Equipment Leasing Co., Ltd. by Westlake International Investments Corporation. 

  

	13.	Approximately 59% joint venture ownership interests in Suzhou Huasu Plastics Co., Ltd. by Westlake International Investments Corporation. 

 

	14.	100 common shares and 15,500 preferred shares in Westech Building Products ULC by Westlake International II B.V. 

  

	15.	50% membership interests in Cypress Interstate Pipeline LLC by Westlake Pipeline Investments LLC. 

  

	16.	50% ownership interests in Warwick Partners I LLC by Westlake NG IV Corporation 

  

	17.	All exiting investments in Restricted Subsidiaries as of the date hereof. 

  

					
		 		 	Schedule 7.10

 SCHEDULE 7.13 

DEBT AND EXISTING LETTERS OF CREDIT 
  

	1.	Note in the amount of $14,400,000 issued on November 30, 2006 by Westlake Ethylene Pipeline Corporation payable to Westlake Development Corporation. 

 

	2.	Note in the amount of $173,622,000 issued on November 30, 2006 by Westlake Longview Corporation payable to Westlake Development Corporation. 

 

	3.	Amount of $8,815,684.55 owed by WPT Division of Westlake Petrochemicals Inc. to Westlake Development Corporation. 

  

	4.	Amount of $74,765,632.39 owed by WPT LLC payable to Westlake Development Corporation. 

  

	5.	Amount of $67,436,085.80 owed by WCA&O Division of Westlake Vinyls, Inc. payable to Westlake Development Corporation. 

  

	6.	Amount of $209,470,192.15 owed by Chlor Alkali Plant division of Westlake Vinyls Company LP payable to Westlake Development Corporation. 

 

	7.	Note in the amount of $50,863,245.87 issued on August 1, 2013 by WPT Division of Westlake Petrochemicals Inc. payable to Westlake Development Corporation. 203015 

 

	8.	Note in the amount of $40,867,782.22 issued on August 1, 2013 by WPT LLC payable to Westlake Development Corporation. 

  

	9.	Note in the amount of $139,390,025.46 issued on August 1, 2013 by WCA&O Division of Westlake Vinyls, Inc. payable to Westlake Development Corporation. 

 

	10.	Note in the amount of $133,422,980.60 issued on August 1, 2013 by Chlor Alkali Plant division of Westlake Vinyls Company LP payable to Westlake Development Corporation. 

  

					
		 		 	Schedule 7.13

 SCHEDULE 7.17 

EXISTING LIENS 
 None. 

  

					
		 		 	Schedule 7.17

 SCHEDULE 13.25 

FORMATION TRANSACTIONS AND PARTNERSHIP STRUCTURE 

See attached. 

  

					
		 		 	Schedule 13.25

 PROSPECTUS SUMMARY 

This summary highlights selected information appearing elsewhere in this prospectus. Because it is abbreviated, this summary does not
contain all of the information that you should consider before investing in our common units. While this summary highlights what we consider to be the most important information about us, you should read the entire prospectus carefully, including
the historical combined carve-out and unaudited pro forma combined carve-out financial statements and the notes to those financial statements. The information presented in this prospectus assumes (i) an initial public offering price of
$         per common unit (the mid-point of the price range set forth on the cover page of this prospectus) and (ii) unless otherwise indicated, that the underwriters’ option to purchase additional
common units is not exercised. You should read “Risk Factors” beginning on page 18 for more information about important risks that you should consider carefully before investing in our common units. 

Unless the context otherwise requires, references in this prospectus to “our partnership,” “our,” “us,”
“we” or like terms refer to “Westlake Chemical Partners LP” and, unless otherwise specified, Westlake Chemical OpCo LP and Westlake Chemical OpCo GP LLC. When used in a historical context, “our,” “us,”
“we” or like terms refer to the ethylene business, including feedstock costs and revenue associated with the sale of ethylene and co-products, conducted by Westlake Chemical Corporation and its subsidiaries, a portion of which will be
contributed to Westlake Chemical OpCo LP in connection with the closing of this offering. References in this prospectus to “our general partner” refer to Westlake Chemical Partners CP LLC. References to “OpCo” refer to Westlake
Chemical OpCo LP, which is a newly created limited partnership owned by us and Westlake Chemical Corporation and its subsidiaries. References to “Westlake” refer collectively to Westlake Chemical Corporation and its subsidiaries, other
than us, our general partner, OpCo and Westlake Chemical OpCo GP LLC, OpCo’s general partner. We will own a 10% limited partner interest and a general partner interest in OpCo. We will consolidate OpCo in our financial statements. We have
provided definitions for some of the terms we use to describe our business and industry and other terms used in this prospectus in the “Glossary of Terms attached as Appendix B to this prospectus. 

Westlake Chemical Partners LP 

Overview 
 We are a Delaware limited
partnership recently formed by Westlake to operate, acquire and develop ethylene production facilities and related assets. Westlake is a vertically-integrated, international manufacturer and marketer of basic chemicals, polymers, and fabricated
building products. Our business and operations are conducted through OpCo, a recently-formed partnership between Westlake and us. At the consummation of this offering, our assets will consist of a 10% limited partner interest in OpCo as well as the
general partner interest in OpCo. Because we own OpCo’s general partner, we have control over all of OpCo’s assets and operations. Westlake has retained a 90% limited partner interest in OpCo and will retain a significant interest in us
through its ownership of our general partner (which owns our incentive distribution rights) as well as     % of our limited partner units (consisting of          common units and all of the
subordinated units). 
 OpCo’s assets will be comprised of three ethylene production facilities, which convert primarily ethane into
ethylene, with an aggregate annual capacity of approximately 3.4 billion pounds and a 200-mile ethylene pipeline. OpCo will derive substantially all of its revenue from its ethylene production facilities. Ethylene is the world’s most widely
used petrochemical in terms of volume and is a key building block used to produce a number of key derivatives, such as polyethylene (“PE”) and polyvinyl chloride (“PVC”), which are used in a wide variety of end markets including
packaging, construction and transportation. Westlake’s downstream PE and PVC production facilities will consume a substantial majority of the ethylene produced by OpCo. OpCo 

  

  
 1 

 
will generate revenue primarily by selling ethylene to Westlake and others, as well as through the sale of co-products of ethylene production, including propylene, crude butadiene, pyrolysis
gasoline and hydrogen. Our sole revenue generating asset will be our 10% limited partner interest in OpCo. 
 In connection with this
offering, OpCo will enter into a 12-year ethylene sales agreement with Westlake, under which Westlake will agree to purchase 95% of OpCo’s planned ethylene production each year on a cost-plus basis that is expected to generate a fixed margin
per pound of $0.10 (the “Ethylene Sales Agreement”). We believe this agreement will promote more stable and predictable cash flows for OpCo. Any ethylene not sold to Westlake and all co-products that are produced by OpCo will be sold to
third parties on either a spot or contract basis. OpCo will also enter into a feedstock supply agreement with Westlake that will supply OpCo with all of the ethane (and any other feedstocks) required for OpCo to produce ethylene under the Ethylene
Sales Agreement (the “Feedstock Supply Agreement”). 
 OpCo primarily uses ethane (a component of natural gas liquids, or NGLs) to
produce ethylene. Approximately 66.5% of global ethylene production is based on higher priced feedstocks (primarily naphtha, as well as butane and propane) whose prices are linked to global oil prices. As a result, global ethylene and ethylene
derivative prices have generally been linked to movements in global oil prices (principally Brent crude prices) for more than 20 years. In the U.S., technological advances in horizontal drilling and fracturing techniques in shale formations have
dramatically increased the production of oil and gas and resulted in the oversupply of ethane. The spread between U.S. ethane and global oil prices has provided a margin advantage for U.S. ethane-based ethylene producers, such as OpCo. Throughout
2012 and 2013, production costs for U.S. ethane-based ethylene producers were significantly lower than global ethylene production facilities utilizing naphtha and other feedstocks. This feedstock cost advantage for U.S. ethane-based ethylene
producers as compared to Asia naphtha-based ethylene producers has resulted in a positive cash cost differential that has ranged from $0.24 per pound to $0.49 per pound, and averaged $0.39 per pound, since 2012. Over the last decade, cash margins of
U.S. ethane-based ethylene producers were above $0.10 per pound every year other than 2009, when cash margins were below $0.10 per pound due to the global economic recession. 

Following the completion of this offering, Westlake will own a 90% limited partner interest in OpCo and will retain a significant interest in
us through its ownership of our general partner (which owns our incentive distribution rights) as well as     % of our limited partner units (consisting of          common units and all of
the subordinated units). Given Westlake’s significant ownership interest in us following this offering, we believe Westlake is incentivized to offer us the opportunity to purchase additional assets that it owns, including additional interests
in OpCo, although it is under no obligation to do so. We may also pursue organic growth opportunities at OpCo as well as acquisitions from third parties, which could be effected jointly with Westlake. OpCo currently plans to expand the capacity of
one of its ethylene production facilities by approximately 250 million pounds in late 2015 or early 2016. 
 For the year ended
December 31, 2013, OpCo had pro forma revenues of approximately $1,202.8 million, pro forma EBITDA of approximately $367.1 million and pro forma net income of approximately $292.1 million. For the same time period, we had pro forma EBITDA (net
of non-controlling interest) of approximately $36.7 million and pro forma net income (net of non-controlling interest) of approximately $29.2 million. On a pro forma basis, revenue from Westlake under the Ethylene Sales Agreement would have
represented approximately 70% of OpCo’s pro forma revenues for the year ended December 31, 2013. The remaining 30% of OpCo’s pro forma revenues would have been comprised of third party ethylene and co-product sales. Please read
“—Summary Historical and Pro Forma Combined Carve-out Financial and Operating Data—Non-GAAP Financial Measure” for the definition of EBITDA and a reconciliation of EBITDA to net income, on a historical basis and pro forma basis,
and to cash flow from operating activities, on a historical basis, which reconciliation is presented in accordance with generally accepted accounting principles (“GAAP”). 

  

  
 2 

 Our Assets and Operations 

Our sole revenue generating asset will be our 10% limited partner interest in OpCo. We will also own the general partner interest of OpCo.
OpCo, in turn, will own: 
  

	 	•	 	two ethylene production facilities at Westlake’s Lake Charles, Louisiana complex (“Petro 1” and “Petro 2,” collectively referred to as “Lake Charles Olefins”), with a combined annual
capacity of approximately 2.7 billion pounds; 

  

	 	•	 	one ethylene production facility at Westlake’s Calvert City, Kentucky complex (“Calvert City Olefins”), with an annual capacity of approximately 630 million pounds; and 

 

	 	•	 	a 200-mile common carrier ethylene pipeline that runs from Mont Belvieu, Texas to the Longview, Texas chemical complex, which includes Westlake’s Longview PE production facility (the “Longview Pipeline”).

 As the owner of the general partner interest of OpCo, we will control all aspects of the management of OpCo, including its
cash distribution policy. See “Business—OpCo’s Assets.” 
 Ethylene Production Facilities. OpCo operates
three ethylene production facilities. Ethylene can be produced from either NGL feedstocks, such as ethane, propane and butane, or from petroleum-derived feedstocks, such as naphtha. Lake Charles Olefins and Calvert City Olefins use ethane primarily
as their feedstock. Calvert City Olefins can also use propane as a feedstock and Petro 2 can also use an ethane/propane mix, propane, butane or naphtha as a feedstock. 

The following table provides information regarding OpCo’s ethylene production facilities as of
            , 2014: 
  

									
	 Plant Location (Description)
	 	Annual Production
Capacity
(millions of pounds)	 	 	 Feedstock
	 	Primary Uses of
Ethylene
	 Lake Charles, LA (Petro 1)
	 	 	1,250	  	 	ethane	 	PE and PVC
	 Lake Charles, LA (Petro 2)
	 	 	1,490	  	 	ethane, ethane/propane mix, propane, butane or naphtha	 	PE and PVC
	 Calvert City, KY (Calvert City Olefins)
	 	 	630	  	 	ethane or propane	 	PVC
		 	  
	  
	 	 		 	
	 Total
	 	 	3,370	  	 		 	
		 	  
	  
	 	 		 	

 Longview Pipeline. OpCo owns the Longview Pipeline, which is a 200-mile common earner ethylene
pipeline, with a capacity of 3.5 million pounds per day that runs from Mont Belvieu, Texas to the Longview, Texas chemical complex, which includes Westlake’s Longview PE production facility. 

Our Ethylene Sales Agreement with Westlake 

In connection with this offering, OpCo will enter into the Ethylene Sales Agreement with Westlake. The Ethylene Sales Agreement will have an
initial term through December 31, 2026 and will automatically renew thereafter for successive 12-month terms unless terminated by either party. The Ethylene Sales Agreement requires Westlake to purchase 95% of OpCo’s planned ethylene
production each year, subject to certain exceptions and a maximum commitment of 3.8 billion pounds per year. If OpCo’s actual production is in excess of planned ethylene production, Westlake will have the option to purchase up to 95% of
production in excess of planned production. 
 Westlake’s purchase price for the minimum commitment of ethylene under the Ethylene
Sales Agreement will be calculated on a per pound basis and includes: 
  

	 	•	 	the actual price paid by OpCo for the feedstock and natural gas to produce each pound of ethylene (subject to a cap and a floor on the amount of feedstock and natural gas used); plus 

  

  
 3 

	 	•	 	the estimated per pound operating costs (including selling, general and administrative expenses) for the year and a five-year average of future expected maintenance capital expenditures and other turnaround
expenditures; less 

  

	 	•	 	the proceeds received by OpCo from the sale of co-products associated with the ethylene purchased by Westlake; plus 

  

	 	•	 	a $0.10 per pound margin. 

 Westlake’s purchase price for any ethylene produced in excess
of the planned production amount will generally equal OpCo’s estimated variable costs of producing the incremental ethylene, plus a $0.10 per pound margin. The estimated operating costs and maintenance capital expenditures and other turnaround
expenditures will be adjusted at the end of each year to reflect certain changes in forecasted costs. If OpCo’s actual operating costs and maintenance capital expenditures and other turnaround expenditures are higher than the estimate for any
year, or OpCo’s actual production is below the planned production amount upon which the per pound operating costs and maintenance capital expenditures and other turnaround expenditures arc based, OpCo will be entitled to include in the fee for
the succeeding year a surcharge to recover the resulting shortfall. If these costs are lower than estimated, OpCo will retain the difference, but such difference may be reflected in periodic downward adjustments to the total estimated costs. The
result of the fee structure is that OpCo should recover the portion of its total operating costs and maintenance capital expenditures and other turnaround expenditures attributable to Westlake’s ethylene purchases. Approximately 5% of
OpCo’s ethylene production will be sold at market rates on either a spot or contract basis to third parties. Average U.S. industry margins for producing ethane-based ethylene arc currently substantially in excess of $0.10 per pound, and
averaged approximately $0.48 per pound in 2013. 
 Business Strategies 

Our primary business objective is to operate efficiently and safely and to grow our business responsibly, enabling us to increase the amount of
cash distributions we make to our unitholders over time while maintaining our financial stability. We intend to accomplish these objectives by executing the following strategies: 

 

	 	•	 	Generate Stable, Fee-Based Cash Flows. We are focused on generating stable cash flows by selling 95% of our ethylene production to Westlake under a long-term, fee-based contract. Our contract with Westlake
includes minimum volume commitments and a pricing provision designed to permit OpCo to generally recover its costs (including selling, general and administrative expenses), plus a fixed $0.10 margin per pound of ethylene sold. In addition, we plan
to supplement these relatively stable cash flows with additional cash flows by maximizing the price of the 5% of our ethylene production and associated co-products sold to third parties. We intend to maintain our focus on fee-based cash flows as we
grow. 

  

	 	•	 	Focus on Operational Excellence. We intend to maximize the throughput of our production facilities while providing safe, reliable and efficient operations. We believe that a key component in generating stable
cash flows is to continuously maintain, monitor and improve the safety and reliability of our operations. 

  

	 	•	 	Pursue Organic Growth Opportunities. We intend to enhance the profitability of OpCo’s existing assets by pursuing opportunities such as capacity expansion projects. OpCo plans to expand Petro 1 to increase
capacity by approximately 250 million pounds in late 2015 or early 2016 and expects to finance this expansion through borrowings from Westlake. We may also pursue additional organic development projects complementary to our existing businesses,
either through OpCo or independently. 

  

	 	•	 	Increase our Ownership of OpCo. We intend to increase our ownership interest in OpCo over time either by purchasing newly issued interests from OpCo or by purchasing outstanding interests in OpCo from Westlake.

  

	 	•	 	Pursue Growth Opportunities Through Acquisitions. We intend to pursue acquisitions of complementary assets from third parties. Such acquisitions could be pursued independently by OpCo, independently by us or
jointly with Westlake. 

  

  
 4 

 Competitive Strengths 

We believe we are well positioned to execute our business strategies based on the following competitive strengths: 

 

	 	•	 	Stable and Predictable Cash Flows from OpCo. The Ethylene Sales Agreement is designed to cover our costs and provide a $0.10 margin per pound on a substantial majority of the ethylene we produce, reducing our
exposure to commodity price volatility and promoting more stable cash flow. Westlake is obligated to purchase 95% of our planned ethylene production. In addition, Westlake is expected to exercise its option to purchase 95% of our excess production.
We believe each of those factors should result in more stable cash flows. 

 Each of OpCo’s ethylene production facilities
requires turnaround maintenance on average every five years. OpCo intends to reserve approximately $28.9 million per year to fund these turnaround expenditures. Reserving these amounts should enable OpCo to maintain steady cash flows for
distributions while funding these significant non-annual expenditures. We intend to use $         million from the proceeds of this offering to fund OpCo’s initial balance for this turnaround reserve.
Westlake’s purchase price for ethylene purchased under the Ethylene Sales Agreement will include a component (adjusted annually) designed to cover, over the long term, substantially all of OpCo’s turnaround expenditures. 

 

	 	•	 	Strategic Relationship with Westlake. We have a strategic relationship with Westlake, which we believe will provide both us and OpCo with a stable base of cash flows as well as opportunities for growth. Westlake
has an investment grade credit rating and is well-capitalized. Westlake will own     % of our limited partner units (consisting of          common units and all of the subordinated units)
and our general partner (which will own our incentive distribution rights). OpCo’s ethylene production facilities are a critical supply source for Westlake’s production of diversified downstream products including PE and PVC and this
vertical integration enables Westlake to capture the economic value of the entire ethylene value chain. In particular, we expect to benefit from the following aspects of our relationship with Westlake: 

 

	 	•	 	Attractive Downstream Polyethylene Product Mix. Westlake focuses on a low-density PE (“LDPE”) and linear low-density PE (“LLDPE”) product mix. LDPE has enjoyed higher margins than LLDPE and
high-density PE (“HDPE”), the more commoditized PE grades. A majority of Westlake’s production is LDPE. Westlake is a leading producer of LDPE by capacity in North America and predominantly uses the autoclave technology (as opposed to
tubular technology), which is capable of producing higher margin specialty PE products. Autoclave LDPE is a more specialized form of LDPE that feeds into a broad array of end products. In contrast tubular LDPE is a more commoditized form of LDPE
with a narrower range of applications. Approximately 80% of Westlake’s LDPE production is autoclave. Furthermore, most announced LDPE industry capacity additions in North American are projected to be tubular LDPE. 

 

	 	•	 	 Highly Integrated Polymers and Vinyls Chain. Westlake is highly integrated along its PVC production chain. Most U.S.-based PVC producers
including Westlake internally produce their chlorine requirements, but most rely on the merchant market for their ethylene requirements. Westlake, however, is substantially integrated into ethylene as well. As a result, Westlake enjoys operational
and cost advantages relative to non-ethylene integrated PVC producers. Importantly, PVC producers that are integrated in ethylene have a cost advantage that supports higher operating

  

  
 5 

	 	 
rates, allowing such producers to be opportunistic in targeting both the domestic and export markets. Westlake’s vinyls, PVC and downstream PVC building products businesses are well
positioned to capitalize on improvements in the construction market, which could drive additional usage of ethylene. 

  

	 	•	 	Acquisition and Growth Opportunities. Immediately after this offering we will own a 10% limited partner interest in OpCo. The opportunity to acquire additional ownership interests in OpCo is an important
potential source of our future growth, although Westlake has no obligation to sell additional interests in OpCo to us. 

  

	 	•	 	Access to Operational and Industry Expertise. We expect to benefit from Westlake’s extensive operational, commercial and technical expertise, as well as its industry relationships, as we seek to optimize and
expand OpCo’s existing asset base. 

  

	 	•	 	Well Maintained Assets with Long History of Reliable Operations. OpCo continually invests in the maintenance and integrity of its assets. OpCo’s ethylene production facilities have operated above the
industry average operating rate of 86.2% since 2005. OpCo conducts regularly scheduled turnarounds at each of its ethylene production facilities to perform planned major maintenance activities. OpCo is also continually focused on improving its asset
portfolio and cost position. At Calvert City Olefins, OpCo recently completed an expansion and feedstock conversion project that resulted in a 180 million pound capacity expansion and also provided OpCo with 100% ethane feedstock capability. In
addition, OpCo plans to expand Petro 1 by approximately 250 million pounds in late 2015 or early 2016. 

  

	 	•	 	Strategically Located Assets. OpCo benefits from the strategic location of its ethylene production facilities, which allows it to access low-cost ethane from the Gulf Coast and the Marcellus and Utica shale
formations. Petro 1 and Petro 2 are both large-scale facilities with abundant feedstock sourcing capabilities given their proximity to Mont Belvieu, the largest NGLs hub on the Gulf Coast. Westlake currently supplies feedstock to Lake Charles
Olefins through several pipelines from a variety of suppliers in Texas and Louisiana. Additionally, Calvert City Olefins is connected to the ATEX pipeline, allowing OpCo to use ethane feedstocks from the Marcellus and Utica shale formations.
Westlake’s Calvert City complex is the only integrated U.S. vinyls complex located outside of the Gulf Coast, giving it a shipping advantage for certain key markets, such as the Midwest, the Northeast and Canada. OpCo recently completed an
expansion and feedstock conversion project at this facility, which increased its ethylene production and enabled it to take advantage of low-cost ethane production from the Marcellus and Utica shale formations. 

 

	 	•	 	Conservative Financial Profile. OpCo has an intercompany credit agreement with Westlake that may be used to fund growth projects and working capital needs. We expect to have
$         million of indebtedness at the closing of this offering and believe that our access to the debt and equity capital markets should provide us with the financial flexibility necessary to pursue organic
expansion and acquisition opportunities. Westlake is a well-capitalized, credit worthy sponsor with an investment grade credit rating and a significant amount of liquidity. Westlake had cash, cash equivalents and current marketable securities of
$700.7 million as of December 31, 2013. Westlake may also provide direct and indirect financing to us from time to time. 

  

	 	•	 	Experienced Management Team. Our management team consists of senior officers of Westlake, who average over 28 years of experience in the petrochemical industry. We believe the level of operational and financial
expertise of our management team will prove critical in successfully executing our business strategies. 

 Our Relationship With Westlake

 Our principal strength is our relationship with Westlake. Westlake is a vertically-integrated, international manufacturer and marketer
of basic chemicals, polymers and fabricated building products. Westlake benefits from highly-integrated production facilities that allow it to process raw materials into higher value-added 

  

  
 6 

 
chemicals and building products. As of December 31, 2013, Westlake had 13.6 billion pounds per year of aggregate production capacity at 15 manufacturing sites in North America as well as a
59% interest in a joint venture that operates a vinyls facility in China. For the year ended December 31, 2013, Westlake had consolidated revenues of approximately $3.8 billion and net income of $610.4 million. Westlake’s common stock
trades on the New York Stock Exchange (“NYSE”) under the symbol “WLK.” 
 Westlake will retain a significant interest in
us through its ownership of     % of our limited partner units (consisting of         common units and all of the subordinated units) and our general partner (which will own all of our
incentive distribution rights). We believe Westlake will promote and support the successful execution of our business strategies because of its significant ownership in us and our general partner and its intention to use us to grow its ethylene
business. We believe Westlake will offer us the opportunity to purchase additional assets from it, including additional interests in OpCo, although it is under no obligation to do so. We also may have the opportunity to pursue acquisitions which
could be effected jointly with Westlake. 
 We will enter into an omnibus agreement with Westlake in connection with this offering. Under
the omnibus agreement, Westlake will agree to indemnify OpCo for certain environmental and other liabilities relating to OpCo’s ethylene production facilities and related assets and OpCo will indemnify Westlake for certain environmental
liabilities for which Westlake is not otherwise obligated to indemnify OpCo and certain other losses and liabilities resulting from Westlake providing services to OpCo. We or OpCo will enter into a number of agreements with Westlake in connection
with this offering, including the Ethylene Sales Agreement described under “—Our Ethylene Sales Agreement with Westlake” and the Feedstock Supply Agreement. Please read “Certain Relationships and Related Transactions.” 

While our relationship with Westlake and its subsidiaries is a significant strength, it is also a source of potential conflicts. Please read
“Conflicts of Interest and Fiduciary Duties.” 
 Risk Factors 

An investment in our common units involves risks. You should carefully consider the risks described in “Risk Factors” and the other
information in this prospectus before deciding whether to invest in our common units. 
 Our Management 

We are managed and operated by the board of directors and executive officers of our general partner, Westlake Chemical Partners GP LLC, a
wholly owned subsidiary of Westlake. As a result of owning our general partner, Westlake will have the right to appoint all members of the board of directors of our general partner, including at least three directors meeting the independence
standards established by the NYSE, and the board of directors of our general partner will appoint its executive officers. At least one of our independent directors will be appointed prior to the date our common units are listed for trading on the
NYSE. Our unitholders will not be entitled to elect our general partner or its directors or otherwise directly participate in our management or operations. For more information about the executive officers and directors of our general partner,
please read “Management.” 
 Summary of Conflicts of Interest and Fiduciary Duties 

Our general partner has a contractual duly to manage us in a manner that it believes is not adverse to our interests. However, the officers and
directors of our general partner have fiduciary duties to manage our general partner in a manner beneficial to Westlake, the owner of our general partner. As a result, conflicts of interest may arise in the future between us or our unitholders, on
the one hand, and Westlake and our general partner, on the other hand. 

  

  
 7 

 Our partnership agreement limits the liability of and replaces the fiduciary duties owed by
our general partner to our unitholders. Our partnership agreement also restricts the remedies available to our unitholders for actions that might otherwise constitute a breach of duties by our general partner or its directors or officers. Our
partnership agreement permits the board of directors of our general partner to form a conflicts committee of independent directors and to submit to that committee matters that the board believes may involve conflicts of interest. Any matters
approved by the conflicts committee will be conclusively deemed to be approved by us and all of our partners and not a breach by our general partner of any duties it may owe us or our unitholders. By purchasing a common unit, the purchaser agrees to
be bound by the terms of our partnership agreement, and each unitholder is treated as having consented to various actions and potential conflicts of interest contemplated in the partnership agreement that might otherwise be considered a breach of
fiduciary or other duties under Delaware law. 
 For a more detailed description of the conflicts of interest and duties of our general
partner and its directors and officers, please read “Conflicts of Interest and Fiduciary Duties.” For a description of other relationships with our affiliates, please read “Certain Relationships and Related Transactions.” 

Principal Executive Offices and Internet Address 

Our principal executive offices are located at 2801 Post Oak Boulevard, Suite 600, Houston, Texas 77056, and our telephone number is
(713) 960-9111. Our website address will be http://www.            .com. We intend to make our periodic reports and other information filed with or furnished to the U.S. Securities and
Exchange Commission, or SEC, available, free of charge, through our website, as soon as reasonably practicable after those reports and other information are electronically filed with or furnished to the SEC. Information on our website or any other
website is not incorporated by reference into this prospectus and does not constitute a part of this prospectus. 
 Formation Transactions and
Partnership Structure 
 We are a Delaware limited partnership formed in March 2014 by Westlake to own and operate certain of the
businesses that have historically been conducted by Westlake. 
 At or prior to the closing of this offering: 

 

	 	•	 	Westlake will cause to be transferred to OpCo Lake Charles Olefins, Calvert City Olefins and the Longview Pipeline; 

  

	 	•	 	OpCo will enter into the Ethylene Sales Agreement with Westlake pursuant to which Westlake will commit to purchase ethylene from OpCo; and 

 

	 	•	 	OpCo will enter into other agreements with Westlake relating to the purchase and supply of ethane and other feedstocks, the operation of OpCo’s ethylene production facilities, the sharing of various site services
and other matters. 

 For further details on our agreements with Westlake and its affiliates, please read
“Business—Agreements with Affiliates” and “Certain Relationships and Related Transactions.” 
 In connection with
the closing of this offering, the following will occur: 
  

	 	•	 	Westlake will contribute a     % limited partner interest in OpCo to us; 

  

	 	•	 	Westlake will contribute OpCo’s general partner to us; 

  

	 	•	 	in exchange for Westlake’s contribution, we will issue to Westlake         common units and all subordinated units; 

  

  
 8 

	 	•	 	we will issue to our general partner all of our incentive distribution rights; 

  

	 	•	 	we will issue          common units to the public; 

  

	 	•	 	we will receive gross proceeds of $          million from the issuance and sale of          common units at an assumed initial offering
price of $          per unit; 

  

	 	•	 	we will use $          million of the proceeds from this offering to pay underwriting discounts, a structuring fee totaling $         
million and estimated offering expenses of $          million; 

  

	 	•	 	we will use $          million of the proceeds from this offering to purchase an additional     % limited partner interest in OpCo (resulting in us owning a
10% limited partner interest), which OpCo will use to repay intercompany debt to Westlake and will use $          million to establish an initial cash reserve for turnaround expenditures;

  

	 	•	 	we and OpCo will enter into an omnibus agreement with Westlake, our general partner and other affiliates governing, among other things, indemnification obligations; and 

 

	 	•	 	OpCo will enter into a credit facility with Westlake. 

 We have granted the underwriters a
30-day option to purchase up to an aggregate of          additional common units. Any net proceeds received from the exercise of this option will be used to purchase an additional limited partner interest in
OpCo. The amount of the additional interest purchased will depend on the amount of the option exercised, and will be calculated at approximately     % purchased for each one million of additional common units purchased by the
underwriters. If the underwriters exercise their option to purchase additional common units in full, we would purchase an additional     % limited partner interest in OpCo. 

  

  
 9 

 Organizational Structure 

The following is a simplified diagram of our ownership structure after giving effect to this offering and the related transactions. 

 
 

 
  

					
	 Public Common Units
	  	 	    	%(1) 
	 Interests of Westlake:
	  			
	 Common Units
	  	 	    	%(1) 
	 Subordinated Units
	  	 	    	% 
	 Non-Economic General Partner Interest
	  	 	0.0	%(2) 
	 Incentive Distribution Rights
	  	 	—  	(3) 
		  	  
	  
	 
		  	 	100.0	% 
		  	  
	  
	 

  

	(1)	Assumes no exercise of the underwriters’ option to purchase additional common units. 

	(2)	Our general partner owns a non-economic general partner interest in us. Please read “How We Make Distributions To Our Partners—General Partner Interest.” 

	(3)	Incentive distribution rights represent a variable interest in distributions and thus arc not expressed as a fixed percentage. Please read “How We Make Distributions To Our Partners—Incentive Distribution
Rights.” Distributions with respect to the incentive distribution rights will be classified as distributions with respect to equity interests. All of our incentive distribution rights will be issued to Westlake Chemical Partners GP LLC, our
general partner, which is wholly owned by Westlake. 

  

  
 10 

 The Offering 

 

			
	Common units offered to the public	  	          common units.
  

         common units if the underwriters exercise their option to purchase additional common units in
full.

		
	Units outstanding after this offering	  	         common units (or          common units if the underwriters’ option to purchase additional common units is exercised in full) and
         subordinated units for a total of          limited partner units (or          limited partner units if the
underwriters’ option to purchase additional common units is exercised in full).
		
	Use of proceeds	  	 We intend to use the estimated net proceeds of approximately $         million from this offering
(based on an assumed initial offering price of $          per common unit, the mid-point of the price range set forth on the cover page of this prospect us), after deducting the estimated underwriting
discounts, structuring fee and offering expenses, to purchase a     % limited partner interest in OpCo, and OpCo will use such net proceeds to repay $         million of intercompany debt
to Westlake and establish a cash reserve of $         million for turnaround expenditures. The     % interest in OpCo purchased with the proceeds from this offering, when combined with the
    % interest in OpCo contributed to us in connection with the formation transactions, will result in our ownership of a 10% limited partner interest in OpCo following the closing of this offering.

 
 If the underwriters exercise their option to purchase additional
         common units in full, the additional net proceeds will be approximately $          million (based on an assumed initial offering price of $
         per common unit, the mid-point of the price range set forth on the cover page of this prospectus). The net proceeds from any exercise of such option will be used to purchase an additional limited
partner interest in OpCo, and OpCo will use such net proceeds to repay intercompany debt to Westlake. Please read “Use of Proceeds.”

		
	Cash distributions	  	 Within 60 days after the end of each quarter, beginning with the quarter ending
            , 2014 we expect to make a minimum quarterly distribution of $          per common unit and subordinated unit ($
         per common unit and subordinated unit on an annualized basis) to unitholders of record on the applicable record date. For the first quarter that we are publicly traded, we will pay a prorated
distribution covering the period from the completion of this offering through             , 2014, based on the actual length of that period.

 
 The board of directors of our general partner will adopt a policy pursuant to which
distributions for each quarter will be paid to the extent we have sufficient cash after establishment of cash reserves and payment of fees and expenses, including payments to our general partner and its affiliates. Our ability to pay the minimum
quarterly

  

  
 11 

			
		  	distribution is subject to various restrictions and other factors described in more detail in “Cash Distribution Policy and Restrictions on Distributions.”
		
		  	Our partnership agreement generally provides that we will distribute cash each quarter during the subordination period in the following manner:
		
		  	 •       first, to the holders of common units, until
each common unit has received the minimum quarterly distribution of $         , plus any arrearages from prior quarters;
  

•       second, to the holders of subordinated units, until each
subordinated unit has received the minimum quarterly distribution of $         ; and
  

•       third, to the holders of common and subordinated units, pro
rata, until each unit has received a distribution of $         .

		
		  	If cash distributions to our unitholders exceed $          per common unit and subordinated unit in any quarter, our unitholders and our general partner, as the holder of our incentive
distribution rights (or IDRs), will receive distributions according to the following percentage allocations:

  

									
	 	  	Marginal Percentage Interest in
Distributions	 
	 Total Quarterly Distribution Target Amount
	  	Unitholders	 	 	General
Partner (as
holder of IDRs)	 
	 above $          up to $         
	  	 	85.0	% 	 	 	15.0	% 
	 above $          up to $         
	  	 	75.0	% 	 	 	25.0	% 
	 above $         
	  	 	50.0	% 	 	 	50.0	% 

  

			
		  	We refer to the additional increasing distributions to our general partner as “incentive distributions.” Please read “How We Make Distributions To Our Partners—Incentive Distribution Rights.”
		
		  	The amount of distributable cash flow we generated during the year ended December 31, 2013 on a pro forma basis would have been approximately $26.3 million. This amount would have been sufficient to pay 100% of the aggregate
minimum quarterly distribution on all common units for that period. However, this amount would only allow us to pay a cash distribution of $          per quarter ($
         on an annualized basis), or approximately     % of the minimum quarterly distribution, on all of our subordinated units. Please read “Cash Distribution Policy and Restrictions
on Distributions.”
		
		  	We believe, based on our financial forecast and related assumptions included in “Cash Distribution Policy and Restrictions on Distributions,” that we will have sufficient distributable cash flow to pay the minimum
quarterly distribution of $          on all of our common units and subordinated units for the twelve months ending June 30, 2015. However, we do not have a legal or contractual obligation to pay
quarterly distributions at the minimum quarterly distribution rate or at any other rate and there is no guarantee that we will pay distributions to our unitholders in any quarter. Please read “Cash Distribution Policy and Restrictions on
Distributions.”

  

  
 12 

			
		
	Subordinated Units	  	Westlake will initially own all of our subordinated units. The principal difference between our common units and subordinated units is that for any quarter during the subordination period, holders of the subordinated units will not
be entitled to receive any distribution from operating surplus until the common units have received the minimum quarterly distribution from operating surplus for such quarter plus any arrearages in the payment of the minimum quarterly distribution
from prior quarters. Subordinated units will not accrue arrearages.
		
	Conversion of subordinated units	  	 The subordination period will end on the first business day after we have earned and paid an aggregate amount of at least the minimum
quarterly distribution multiplied by the total number of outstanding common and subordinated units for each of three consecutive, non-overlapping four-quarter periods ending on or after
            , 2017 and there are no outstanding arrearages on our common units.
  

Notwithstanding the foregoing, the subordination period will end on the first business day after we have paid an aggregate amount of at least 150.0% of the
minimum quarterly distribution on an annualized basis multiplied by the total number of outstanding common and subordinated units and we have earned that amount plus the related distribution on the incentive distribution rights, for any four-quarter
period ending on or after             , 2015 and there are no outstanding arrearages on our common units.
  

When the subordination period ends, all subordinated units will convert into common units on a one-for-one basis, and all common units will thereafter no
longer be entitled to arrearages.

		
	Issuance of additional units	  	Our partnership agreement authorizes us to issue an unlimited number of additional units without the approval of our unitholders. Please read “Units Eligible for Future Sale” and “The Partnership
Agreement—Issuance of Additional Interests.”
		
	Limited voting rights	  	Our general partner will manage and operate us. Unlike the holders of common stock in a corporation, our unitholders will have only limited voting rights on matters affecting our business. Our unitholders will have no right to elect
our general partner or its directors on an annual or other continuing basis. Our general partner may not be removed except by a vote of the holders of at least
66 2⁄3% of the outstanding units, including any units owned by our general partner and its affiliates, voting together as a single class. Upon consummation of
this offering, Westlake will own an aggregate of     % of our outstanding units (or     % of our outstanding units, if the underwriters exercise their option to purchase additional common units in full). This
will give Westlake the ability to prevent the removal of our general partner. In addition, any vote to remove our general partner during the subordination period must provide for the election of a successor general partner by the holders of a
majority of

  

  
 13 

			
		  	the common units and a majority of the subordinated units, voting as separate classes. This will provide Westlake the ability to prevent the removal of our general partner. Please read “The Partnership Agreement—Voting
Rights.”
		
	Limited call right	  	If at any time our general partner and its affiliates own more than 80% of the outstanding common units, our general partner has the right, but not the obligation, to purchase all of the remaining common units at a price equal to
the greater of (i) the average of the daily closing price of the common units over the 20 trading days preceding the date three days before notice of exercise of the call right is first mailed and (ii) the highest per-unit price paid by our general
partner or any of its affiliates for common units during the 90-day period preceding the date such notice is first mailed. Please read “The Partnership Agreement—Limited Call Right.”
		
	Directed Unit Program	  	 At our request, the underwriters have reserved up to     % of the common units being offered by this prospectus for sale
at the initial public offering price to the officers, directors and employees of our general partner and its affiliates and certain other persons associated with us, as designated by us. For further information regarding our directed unit program,
please read “Underwriting.”
  
 Members of the Chao family or entities
affiliated with such members, who in the aggregate beneficially own approximately 69% of Westlake’s common stock, have indicated an interest in purchasing a portion of the common units being offered in this offering through our directed unit
program.

		
	Estimated ratio of taxable income to distributions	  	  
 We estimate that if you own the common units you purchase in this
offering through the record date for distributions for the period ending December 31, 2016, you will be allocated, on a cumulative basis, an amount of federal taxable income for that period that will be less than 20% of the cash distributed to you
with respect to that period. For example, if you receive an annual distribution of $         per unit, we estimate that your average allocable federal taxable income per year will be no more than approximately
$         per unit. Thereafter, the ratio of allocable taxable income to cash distributions to you could substantially increase. Please read “Material U.S. Federal Income Tax Consequences—Tax
Consequences of Unit Ownership” for the basis of this estimate.

		
	Material federal income tax consequences	  	  
 For a discussion of the material federal income tax consequences that
may be relevant to unitholders who are individual citizens or residents of the United States, please read “Material U.S. Federal Income Tax Consequences.”

		
	Exchange listing	  	We intend to apply to list our common units on the New York Stock Exchange (the “NYSE”) under the symbol “WLKP.”

  

  
 14 

 Summary Historical and Pro Forma Combined Carve-out Financial and Operating Data 

We were formed on March 14, 2014 and have had no operations since formation. Therefore, our historical financial data is not included in
the following table. The following table shows summary historical combined carve-out financial data of the predecessor of Westlake Chemical Partners LP (the “Predecessor”). The following table also shows our summary unaudited pro forma
combined carve-out financial data for the period and as of the date indicated. The summary historical combined carve-out balance sheet data presented as of December 31, 2013 and 2012 and the statement of operations data for the years ended
December 31, 2013, 2012, and 2011 are derived from the audited historical combined carve-out financial statements of our Predecessor, which are included elsewhere in this prospectus. The summary historical combined carve-out balance sheet data
presented as of December 31, 2011 is derived from the unaudited historical combined carve-out financial statements of our Predecessor, which are not included in this prospectus. 

The summary historical combined carve-out financial statements of our Predecessor reflect Westlake’s entire ethylene business, including,
but not limited to, procuring feedstock, managing inventory and commodity risk and transporting ethylene from manufacturing facilities. Our assets on the closing date of the offering will consist only of our 10% limited partner interest in OpCo.
OpCo’s assets will consist of Lake Charles Olefins, Calvert City Olefins and the Longview Pipeline. OpCo’s financial results will be consolidated into ours for financial reporting purposes. The following table should be read together with,
and is qualified in its entirety by reference to, the historical audited combined carve-out financial statements of the Predecessor and the accompanying notes included elsewhere in this prospectus. The following table should also be read together
with “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” 
 The summary unaudited pro
forma combined carve-out financial data presented in the following table as of, and for the year ended, December 31, 2013, are derived from the unaudited pro forma combined carve-out financial statements included elsewhere in this prospectus.
The unaudited pro forma combined carve-out balance sheet assumes the offering and the related transactions occurred as of December 31, 2013, and the unaudited pro forma combined carve-out statement of operations for the year ended
December 31,2013, assumes the offering and the related transactions occurred as of January 1, 2013. These transactions include, and the unaudited pro forma combined carve-out financial statements give effect to, the following: 

 

	 	•	 	Westlake’s contribution to OpCo of Lake Charles Olefins, Calvert City Olefins and the Longview Pipeline; 

  

	 	•	 	the transfer by Westlake to us of a limited partner interest in OpCo, and a 100% interest in Westlake Chemical OpCo GP LLC, which holds the general partner interest in OpCo, in exchange for the issuance by us to
subsidiaries of Westlake of          common units,          subordinated units and all of the incentive distribution rights; 

 

	 	•	 	the consummation of this offering and our issuance of          common units to the public at an assumed initial offering price of $        
per unit and the use of proceeds therefrom as described under “Use of Proceeds”; and 

  

	 	•	 	OpCo’s execution of the Ethylene Sales Agreement, omnibus agreement and services agreement with Westlake. 

The unaudited pro forma combined carve-out financial statements do not give effect to an estimated $3.0 million in incremental general and
administrative expenses that we expect to incur annually as a result of being a separate, publicly traded partnership, including costs associated with preparing and filing annual and quarterly reports to unit holders, financial statement audits, tax
return and Schedule K-1 preparation and distribution, investor relations activities, registrar and transfer agent fees and independent director compensation. 

  

  
 15 

 The following table presents the non-GAAP financial measure of EBITDA, which we use in our
business. For a definition of EBITDA and a reconciliation to our most directly comparable financial measures calculated and presented in accordance with GAAP, please read “—Non-GAAP Financial Measure.” 

 

																	
	 	  	Westlake Chemical Partners LP
Predecessor Historical	 	 	Westlake
Chemical
Partners LP
Pro Forma	 
	 	  	Year Ended December 31,	 
	 	  	2013	 	 	2012	 	 	2011	 	 	2013	 
	 	  	 (dollars in thousands,

except per unit data)
	 	 	(unaudited)	 
	 Combined Carve-out Statement of Operations Data:
	  				 				 				 			
	 Total net sales
	  	$	2,127,747	  	 	$	2,249,098	  	 	$	2,251,043	  	 	$	1,202,791	  
	 Gross profit
	  	 	872,607	  	 	 	635,652	  	 	 	409,098	  	 	 	322,450	  
	 Selling, general and administrative expenses
	  	 	25,451	  	 	 	24,103	  	 	 	24,312	  	 	 	25,451	  
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Income from operations
	  	 	847,156	  	 	 	611,549	  	 	 	384,786	  	 	 	296,999	  
	 Interest expense—Westlake
	  	 	(8,032	) 	 	 	(8,937	) 	 	 	(8,947	) 	 	 	(3,460	) 
	 Other income (expense), net
	  	 	7,701	  	 	 	4,186	  	 	 	2,804	  	 	 	(168	) 
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Income before income taxes
	  	 	846,825	  	 	 	606,798	  	 	 	378,643	  	 	 	293,371	  
	 Provision for income taxes
	  	 	300,279	  	 	 	210,878	  	 	 	131,670	  	 	 	1,316	  
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Net income
	  	$	546,546	  	 	$	395,920	  	 	$	246,973	  	 	$	292,055	  
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Net income attributable to Westlake Chemical Partners LP
	  				 				 				 	$	29,205	  
	 Limited partners’ interest in net income attributable to Westlake Chemical Partners LP
	  				 				 				 			
	 Common units
	  				 				 				 	$	            	  
	 Subordinated units
	  				 				 				 	$	            	  
	 Net income per limited partner unit (basic and diluted):
	  				 				 				 			
	 Common units
	  				 				 				 	$	            	  
	 Subordinated units
	  				 				 				 	$	            	  
	 Combined Carve-out Balance Sheet Data (end of period):
	  				 				 				 			
	 Working capital
	  	$	43,642	  	 	$	40,336	  	 	$	90,420	  	 			
	 Total assets
	  	 	1,041,474	  	 	 	834,843	  	 	 	800,376	  	 			
	 Total debt
	  	 	252,973	  	 	 	253,000	  	 	 	253,000	  	 			
	 Net investment
	  	 	455,432	  	 	 	273,812	  	 	 	216,705	  	 			
					
	 Combined Carve-out Cash Flow Data:
	  				 				 				 			
	 Cash flow from:
	  				 				 				 			
	 Operating activities
	  	$	602,509	  	 	$	496,821	  	 	$	268,716	  	 			
	 Investing activities
	  	 	(230,050	) 	 	 	(158,008	) 	 	 	(71,637	) 	 			
	 Financing activities
	  	 	(372,459	) 	 	 	(338,813	) 	 	 	(197,079	) 	 			
					
	 Other Data:
	  				 				 				 			
	 Depreciation and amortization
	  	$	73,463	  	 	$	64,257	  	 	$	57,193	  	 			
	 Capital expenditures
	  	 	223,130	  	 	 	158,440	  	 	 	73,681	  	 			
	 EBITDA(1)
	  	 	928,320	  	 	 	679,992	  	 	 	444,783	  	 	$	367,086	  
	 EBITDA attributable to Westlake Chemical Partners LP
	  				 				 				 	$	36,709	  

  

	(1)	For a definition of EBITDA and a reconciliation of EBITDA to our most directly comparable financial measures calculated and presented in accordance with GAAP, please read “—Non-GAAP Financial Measure.”

  

  
 16 

 Non-GAAP Financial Measure 

We define EBITDA as net income before interest expense, income taxes, depreciation and amortization. EBITDA is not a measure made in accordance
with GAAP. EBITDA is used as a supplemental financial measure by management and by external users of our financial statements, such as investors, lenders and rating agencies, to assess: 

 

	 	•	 	our operating performance as compared to that of other publicly traded partnerships, without regard to historical cost basis or capital structure; 

 

	 	•	 	our ability to incur and service debt and fund capital expenditures; and 

  

	 	•	 	the viability of acquisitions and other capital expenditure projects and the returns on investment of various investment opportunities. 

We believe that the presentation of EBITDA in this prospectus provides useful information to investors in assessing our financial condition
and results of operations. The GAAP measures most directly comparable to EBITDA are net income and cash flow from operating activities. EBITDA should not be considered as an alternative to GAAP net income or cash flow from operating activities.
EBITDA has important limitations as an analytical tool because it excludes some but not all items that affect net income and cash flow from operating activities. You should not consider EBITDA in isolation or as a substitute for analysis of our
results as reported under GAAP. Additionally, because EBITDA may be defined differently by other companies in our industry, our definition of EBITDA may not be comparable to similarly titled measures of other companies, thereby diminishing its
utility. 
 The following table presents a reconciliation of EBITDA to net income, on a historical basis and pro forma basis, and cash flow
from operating activities, on a historical basis. 
  

																	
	 	  	Westlake Chemical Partners LP
Predecessor Historical	 	 	Westlake
Chemical
Partners LP
Pro Forma	 
	 	  	Year Ended December 31,	 
	 	  	2013	 	 	2012	 	 	2011	 	 	2013	 
	 	  	(dollars in thousands)	 	 	(unaudited)	 
	 Reconciliation of EBITDA and Pro Forma EBITDA to net income and cash flow from operating activities
	  				 				 				 			
	 EBITDA attributable to Westlake Chemical Partners LP
	  				 				 				 	$	36,709	  
	 Add: EBITDA attributable to noncontrolling interest in OpCo
	  				 				 				 	 	330,377	  
	 EBITDA
	  	$	928,320	  	 	$	679,992	  	 	$	444,783	  	 	 	367,086	  
	 Less:
	  				 				 				 			
	 Provision for income taxes
	  	 	(300,279	) 	 	 	(210,878	) 	 	 	(131,670	) 	 	 	(1,316	) 
	 Interest expense
	  	 	(8,032	) 	 	 	(8,937	) 	 	 	(8,947	) 	 	 	(3,460	) 
	 Depreciation and amortization
	  	 	(73,463	) 	 	 	(64,257	) 	 	 	(57,193	) 	 	 	(70,255	) 
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Net income
	  	$	546,546	  	 	$	395,920	  	 	$	246,973	  	 	$	292,055	  
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 	  
	  
	 
	 Changes in operating assets and liabilities, and other
	  	 	16,562	  	 	 	105,804	  	 	 	22,907	  	 			
	 Equity in loss (income) of joint venture, net of dividends
	  	 	402	  	 	 	277	  	 	 	(364	) 	 			
	 Deferred income taxes
	  	 	37,054	  	 	 	(8,096	) 	 	 	(1,859	) 	 			
	 Loss from disposition of fixed assets
	  	 	1,905	  	 	 	2,834	  	 	 	30	  	 			
	 Provision for doubtful accounts
	  	 	40	  	 	 	82	  	 	 	1,029	  	 			
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 			
	 Cash flow from operating activities
	  	$	602,509	  	 	$	496,821	  	 	$	268,716	  	 			
		  	  
	  
	 	 	  
	  
	 	 	  
	  
	 	 			

  

  
 17Payment Agreement

 

STATE OF TEXAS

 

COMPTROLLER OF PUBLIC ACCOUNTS

 

PAYMENT AGREEMENT

 

	  DGSE Corporation	 	  17521848246
	  Taxpayer Name	 	  Taxpayer’s Number
	 	 	 
	  11311 Reeder Rd.	 	  Dallas,Texas 75229-3408
	  Street Address	 	  City State Zip Code
	 	 	 
	 	 	  7/11/2014
	 	 	  Date of Agreement

 

The above named taxpayer agrees that the
following delinquent Sales & Use taxes, penalties and interest are owed and will be paid according to the following terms:

 

	Tax	 	$	800,397,12	 
	Penalty	 	$	80,039.72	 
	Interest	 	$	239,922.23	 
	Amt Due	 	$	1,120,359.07	 
	Down Payment	 	$	325,000.00	 
	Total Amount Due	 	$	795,359.07	 

 

This liability is for the period 03/01/06 through
11/30/09.

 

TERMS OF AGREEMENT:

 

In consideration of the mutual promises and
agreements contained herein, and to provide for the collection of the amounts identified above, the parties agree to the following
terms:

 

		1.	Taxpayer shall pay $47,000.00 on or before the 15th
                                         day of each month, beginning on August 15 , 2014, and continuing on the 15th day
                                         of each month thereafter until the entire tax liability, including penalties and all
                                         accrued interest are paid in full.

 

		2.	Additional statutory penalties and/ or interest will accrue on the
                                         unpaid tax balance and must be paid as part of this agreement.

 

    	 

    	 

    

 

Payment Agreement

 

		3.	Upon default of any of the terms of this agreement, the Comptroller
                                         may collect the amounts due from the taxpayer by any method allowed by Chapter 111, Tax
                                         Code, or any other applicable law. No notice of default is required to be given to any
                                         party prior to taking such collection action.

 

		4.	No State tax lien currently on record, or hereafter filed, will
                                         be released until all taxes, penalties and interest due under this agreement or on this
                                         account are paid in full.

 

		5.	All payments shall be made in the form of cash, certified check
                                         or money order payable to the Comptroller of Public Accounts. All payments shall be directed
                                         to the attention of Texas Comptroller 9221 LBJ Freeway Dallas, Texas 75243-3429 and must
                                         be physically received or postmarked on the date that they are due.

 

		6.	The Statute of Limitations for collecting any amounts due herein
                                         is extended for the duration of this agreement and that no further written extensions
                                         of the limitations period need be executed by the parties. This extension of the Statute
                                         of Limitations for collection does not extend the period for refunds or assessment.

 

		7.	The parties have read this agreement carefully and have been given
                                         the opportunity to consult with legal counsel prior to its execution.

 

		8.	The individuals executing this agreement on behalf of the parties
                                         all expressly represent that they have full legal capacity and authority to enter into
                                         this agreement on behalf of the named party.

 

		9.	This agreement sets forth the entire understanding of the parties
                                         with respect to this matter. It may not be amended or modified without mutual consent
                                         of both parties. The parties expressly agree that the remedies provided to the Comptroller
                                         are cumulative, and are in addition to, and not in lieu of any remedies available to
                                         the Comptroller under the Texas Tax Code.

 

		10.	Jurisdiction of and venue for enforcement and interpretation of
                                         this agreement shall lie exclusively with the district courts of Travis County, Texas.
                                         The parties agree that any suit brought with respect to this agreement or its enforcement
                                         must be heard in the district courts of Travis County, Texas and in no other jurisdiction
                                         or forum.

 

		11.	The taxpayer must file and pay in full all current and future tax
                                         reports or returns with the Comptroller as required by law.

 

		12.	This Payment Agreement is not binding and effective until and unless
                                         it is signed and approved by an authorized Comptroller Representative.

 

		13.	Notices generated as the result of a delinquency shall continue
                                         to be mailed during the course of the payment agreement regardless of any special conditions
                                         indicated.

 

SPECIAL CONDITIONS:

1)Installment payments may be made electronically.

 

    	 

    	 

    

 

Payment Agreement

 

2)The Comptroller agrees to waive the
10% determination penalty

 

3)The length of this agreement is 18
months

 

	Sign

        here:
	 	 	Sign

        here:
	 
	 	Taxpayer	 	 	Comptroller’s Representative
	 	Title: ___________________________________	 	 	 
	 	 	 	 	 
	Sign	 	 	 	 
	here:	 	 	 	 
	 	Taxpayer	 	 	 
	 	Title: ___________________________________

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00233-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00233-of-00352.parquet"}]]