Document:

Exhibit

        
EXHIBIT 4.18

SUPPLEMENTAL INDENTURE

SUPPLEMENTAL INDENTURE (this “ Supplemental Indenture”), dated as of October 25, 2016, among the entities listed in Annex A (the “Guaranteeing Subsidiaries”), Westlake Chemical Corporation, a Delaware corporation (the “ Company”), the other Subsidiary Guarantors (as defined in the Indenture referred to below and listed on the signature pages hereto) and The Bank of New York Mellon Trust Company, N.A. (as successor to JPMorgan Chase Bank, National Association), as trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Company and the Subsidiary Guarantors have heretofore executed and delivered to the Trustee an indenture dated as of January 1, 2006, as supplemented by that certain Second Supplemental Indenture dated as of November 1, 2007 (the “Second Supplemental Indenture”) providing for the issuance of the Company’s 63⁄4% Senior Notes due 2032 (the “ 63⁄4% Senior Notes”), that certain Supplemental Indenture dated as of December 31, 2007, related to the 63⁄4% Senior Notes, that certain Third Supplemental Indenture dated as of July 2, 2010 (the “Third Supplemental Indenture”) providing for the issuance of the Company’s 6.50% Senior Notes due 2029 (the “ 6.50% Senior Notes”), that certain Fourth Supplemental Indenture dated as of December 2, 2010 (the “Fourth Supplemental Indenture”) providing for the issuance of the Company’s 6.50% Senior Notes due 2035 (the “6.50% Senior (GO Zone) Notes”), that certain Fifth Supplemental Indenture dated as of December 2, 2010 (the “Fifth Supplemental Indenture”) providing for the issuance of the Company’s 6.50% Senior Notes due 2035 (the “ 6.50% Senior (IKE Zone) Notes”), that certain Sixth Supplemental Indenture dated as of July 17, 2012 (the “Sixth Supplemental Indenture”) providing for the issuance of the Company’s 3.600% Senior Notes due 2022 (the “3.600% Senior Notes”), that certain Seventh Supplemental Indenture dated as of February 12, 2013 (the “Seventh Supplemental Indenture”), that certain Supplemental Indenture dated as of May 1, 2013, that certain Supplemental Indenture, dated as of June 1, 2013, related to the 63⁄4% Senior Notes, that certain Supplemental Indenture, dated as of June 1, 2013, related to the 63⁄4% Senior Notes and the 6.50% Senior Notes, that certain Supplemental Indenture dated July 17, 2014, that certain Eighth Supplemental Indenture dated as of August 10, 2016 (the “Eighth Supplemental Indenture”) providing for the issuance of the Company’s 3.600% Senior Notes due 2026 (the “3.600% Senior Notes due 2026”) and 5.000% Senior Notes due 2046 (the “5.000% Senior Notes”) and that certain Ninth Supplemental Indenture dated as of September 7, 2016 (the “Ninth Supplemental Indenture”) providing for the issuance of the Company’s 4.625% Senior Notes due 2021 (the “4.625% Senior Notes”) and 4.875% Senior Notes due 2023 (the “4.875% Senior Notes” and together with the other notes defined above, the “Notes”) (as so supplemented, the “Indenture”);

WHEREAS, Section 4.16 of the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture and the Fifth Supplemental Indenture and Section 4.11 of the Sixth Supplemental Indenture, the Eighth Supplemental Indenture and the Ninth Supplemental Indenture provide that under certain circumstances a Domestic Subsidiary of the Company shall execute and deliver to the Trustee a supplemental indenture pursuant to which such Domestic Subsidiary shall fully and unconditionally guarantee all of the Company’s payment obligations under the Indenture and the Notes issued thereunder on the terms and conditions set forth therein (the “Note Guarantee”);

WHEREAS, Section 9.01(4) of the Indenture provides that, without the consent of any Holder (as defined therein), the Company, the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture to add guarantees of or additional obligors on each series of the Notes;

WHEREAS, the Guaranteeing Subsidiaries desire to become Subsidiary Guarantors under the Indenture with respect to the Notes and to have the Note Guarantee be treated as a Guarantee under the Indenture; and

WHEREAS, the Company and the Subsidiary Guarantors, pursuant to the foregoing authority, propose to amend and supplement the Indenture in certain respects to provide for the Note Guarantee.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the Guaranteeing Subsidiaries, the other 

        
EXHIBIT 4.18

Subsidiary Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1.   CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.    AGREEMENT TO GUARANTEE. The Guaranteeing Subsidiaries hereby agree that (i) they shall be Subsidiary Guarantors under the Indenture with respect to the Notes, (ii) the Note Guarantee is a “Guarantee” (as defined in Section 10.01(b) of the Indenture) as such term is used in the Indenture, including, without limitation, Article X thereof, and (iii) the terms and provisions of Article X apply to the Note Guarantee.

3.    NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

4.   COUNTERPARTS.  The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

5.   EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof.

6.   THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries, the other Subsidiary Guarantors and the Company.

7.   TRUST INDENTURE ACT CONTROLS. If any provision of this Supplemental Indenture limits, qualifies or conflicts with the duties imposed by TIA §318(c), the imposed duties will control.

8.   SUPPLEMENTAL INDENTURE INCORPORATED INTO INDENTURE. The terms and conditions of this Supplemental Indenture shall be deemed to be part of the Indenture for all purposes with respect to the Notes and the Note Guarantee. The Indenture is hereby incorporated by reference herein and, as supplemented by this Supplemental Indenture, is in all respects adopted, ratified and confirmed.

9.   NOTES DEEMED CONFORMED. As of the date hereof, the provisions of the Notes shall be deemed to be conformed, without the necessity for any reissuance or exchange of any such Note or any other action on the part of the Holders of the Notes, the Company, any Subsidiary Guarantor or the Trustee, so as to reflect this Supplemental Indenture.

10.    SUCCESSORS. All agreements of the Guaranteeing Subsidiaries in the Indenture will bind its respective successors, except as otherwise expressly provided in the Indenture.

11.   SEVERABILITY.  In case any provision in this Supplemental Indenture is invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions will not in any way be affected or impaired thereby.

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

        
EXHIBIT 4.18

COMPANY:

WESTLAKE CHEMICAL CORPORATION

By: /s/ Albert Chao               
Name: Albert Chao 
Title: President and Chief Executive Officer

[Signature Page to Supplemental Indenture]

GUARANTEEING SUBSIDIARIES

LAGOON LLC
AXIALL CORPORATION
AXIALL HOLDCO, INC.
AXIALL NOTECO, INC.
AXIALL OHIO, INC.
AXIALL, LLC 
EAGLE HOLDCO 3 LLC
EAGLE NATRIUM LLC
EAGLE PIPELINE, INC.
EAGLE SPINCO INC.
EAGLE US 2 LLC
GEORGIA GULF LAKE CHARLES, LLC 
PHH MONOMERS, LLC
PLASTIC TRENDS, INC.
ROME DELAWARE CORPORATION
ROYAL BUILDING PRODUCTS (USA) INC.
ROYAL PLASTICS GROUP (U.S.A.) LIMITED
ROYAL WINDOWS AND DOOR PROFILES PLANT 13 INC.
ROYAL WINDOWS AND DOOR PROFILES PLANT 14 INC.

By:    /s/ Albert Chao                                
Name: Albert Chao 
Title: President

[Signature Page to Supplemental Indenture]

EXISTING SUBSIDIARY GUARANTORS:

	
		
	GEISMAR HOLDINGS, INC. 
GVGP, INC.
WESTLAKE CHEMICAL INVESTMENTS, INC. 
WESTLAKE GEISMAR POWER COMPANY LLC
BY WESTLAKE VINYLS COMPANY LP, 
ITS MANAGER
BY GVGP, INC., 
ITS GENERAL PARTNER
WESTLAKE LONGVIEW CORPORATION 
WESTLAKE MANAGEMENT SERVICES, INC. 
WESTLAKE NG I CORPORATION 
WESTLAKE OLEFINS CORPORATION
WESTLAKE PIPELINE INVESTMENTS LLC,
BY WESTLAKE CHEMICAL INVESTMENTS, INC., 
ITS MANAGER
WESTLAKE POLYMERS LLC,
BY WESTLAKE CHEMICAL INVESTMENTS, INC., 
ITS MANAGER
WESTLAKE PVC CORPORATION 
WESTLAKE RESOURCES CORPORATION 
WESTLAKE STYRENE LLC,
BY WESTLAKE CHEMICAL INVESTMENTS, INC.,
      ITS MANAGER
WESTLAKE SUPPLY AND TRADING COMPANY 
WESTLAKE VINYL CORPORATION 
WESTLAKE VINYLS COMPANY LP,
BY GVGP, INC., 
ITS GENERAL PARTNER
WESTLAKE VINYLS, INC. 
WPT LLC,
       BY WESTLAKE CHEMICAL INVESTMENTS, INC., 
              ITS MANAGER 
WESTLAKE PETROCHEMICALS LLC,  
        BY WESTLAKE CHEMICAL INVESTMENTS, INC.,
        ITS MANAGER

	

By:   /s/ Albert Chao         
	 

	   Name: Albert Chao
	 

	   Title: President
	 

[Signature Page to Supplemental Indenture]

	
			
	WESTECH BUILDING  PRODUCTS (EVANSVILLE) LLC
BY WESTECH BUILDING PRODUCTS, INC.,
                     ITS MANAGER  
NORTH AMERICAN SPECIALTY PRODUCTS LLC,
      BY NORTH AMERICAN PIPE CORPORATION,
              ITS MANAGER

	By:   /s/ Robert F. Buesinger         
	 
	 

	   Name:   Robert F. Buesinger
	 
	 

	   Title:   President
	 
	 

	 
	 

[Signature Page to Supplemental Indenture]

Trustee:

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

By:    /s/ R. Tarnas    
Name: R. Tarnas
Title: Vice President 

[Signature Page to Supplemental Indenture]

Annex A
 
Guaranteeing Subsidiaries

Lagoon LLC
Axiall Corporation
Axiall Holdco, Inc.
Axiall Noteco, Inc.
Axiall Ohio, Inc.
Axiall, LLC (f/k/a Georgia Gulf Chemicals & Vinyls, LLC)
Eagle Holdco 3 LLC
Eagle Natrium LLC
Eagle Pipeline, Inc.
Eagle Spinco Inc.
Eagle US 2 LLC
Georgia Gulf Lake Charles, LLC 
PHH Monomers, LLC
Plastic Trends, Inc.
Rome Delaware Corporation
Royal Building Products (USA) Inc.
Royal Plastics Group (U.S.A.) Limited
Royal Windows and Door Profiles Plant 13 Inc.
Royal Windows and Door Profiles Plant 14 Inc.Exhibit

Exhibit 10.5

JOINDER AGREEMENT
October 14, 2016

Reference is made to that certain Credit Agreement, dated as of August 23, 2016 (as amended, amended and restated, supplemented, waived or otherwise modified from time to time, the “Credit Agreement”) among Westlake Chemical Corporation, the other Borrowers referred to therein, the Guarantors referred to therein, the Lenders party thereto, the Issuing Banks party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent.  Terms defined in the Credit Agreement are used herein with the same meanings.

NOW, THEREFORE, the Administrative Agent and the entities listed on Schedule I hereof (each, a “New Guarantor” and collectively, the “New Guarantors”) each in its capacity as a Guarantor, hereby agrees as follows:

1.    Joinder as Guarantor.  In accordance with ‎Section 5.10(a) of the Credit Agreement, each New Guarantor by its signature below becomes a Guarantor under the Credit Agreement with the same force and effect as if originally named therein as a Guarantor, but in any event subject to the same terms, provisions and limitations set forth in ‎Article XI of the Credit Agreement.  Each New Guarantor hereby agrees to all the terms and provisions of the Credit Agreement applicable to it as a Guarantor.  Each reference to a Guarantor in the Credit Agreement shall be deemed to include each New Guarantor.

2.     Representations and Warranties.  Each New Guarantor represents and warrants that each of the representations and warranties set forth in the Credit Agreement and applicable to the undersigned is true in all material respects on and as of the date hereof, except to the extent any such representation and warranty (i) expressly relates to an earlier date in which case such representation and warranty shall be true and correct in all material respects as of such earlier date or (ii) is qualified by materiality, in which case such representation and warranty shall be true and correct in all respects.

4.    Severability.  Any provision of this Joinder Agreement which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

5.     Counterparts.  This Joinder Agreement may be executed in counterparts, each of which shall constitute an original.  Delivery of an executed signature page to this Joinder Agreement by facsimile or electronic transmission shall be as effective as delivery of an original executed counterpart of this Joinder Agreement.

6.    No Waiver. Except as expressly supplemented hereby, the Credit Agreement shall remain in full force and effect.

7.     Notices. All notices, requests and demands to or upon each New Guarantor, the Administrative Agent or any Lender shall be governed by the terms of ‎Section 9.01 of the Credit Agreement.

8.     Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

[Signature Pages Follow]

IN WITNESS WHEREOF, the undersigned have caused this Joinder Agreement to be duly executed and delivered by their duly authorized officers as of the day and year first above written.
                
LAGOON LLC
AXIALL CORPORATION
AXIALL HOLDCO, INC.
AXIALL NOTECO, INC.
AXIALL OHIO, INC.
AXIALL, LLC 
EAGLE HOLDCO 3 LLC
EAGLE NATRIUM LLC
EAGLE PIPELINE, INC.
EAGLE SPINCO INC.
EAGLE US 2 LLC
GEORGIA GULF LAKE CHARLES, LLC 
PHH MONOMERS, LLC
PLASTIC TRENDS, INC.
ROME DELAWARE CORPORATION
ROYAL BUILDING PRODUCTS (USA) INC.
ROYAL PLASTICS GROUP (U.S.A.) LIMITED
ROYAL WINDOWS AND DOOR PROFILES PLANT 13 INC.
ROYAL WINDOWS AND DOOR PROFILES PLANT 14 INC.

as Guarantors

By:    /s/ Albert Chao            
Name: Albert Chao 
Title: President

[Signature Page to Joinder of New Guarantors]

	
		
	JPMORGAN CHASE BANK, N.A., as Administrative Agent

	By:
	/s/ John Kushnerick

	Name:   John Kushnerick

	Title:   Executive Director

[Signature Page to Joinder of New Guarantors]

Schedule I
New Guarantors

LAGOON LLC
AXIALL CORPORATION
AXIALL HOLDCO, INC.
AXIALL NOTECO, INC.
AXIALL OHIO, INC.
AXIALL, LLC 
EAGLE HOLDCO 3 LLC
EAGLE NATRIUM LLC
EAGLE PIPELINE, INC.
EAGLE SPINCO INC.
EAGLE US 2 LLC
GEORGIA GULF LAKE CHARLES, LLC 
PHH MONOMERS, LLC
PLASTIC TRENDS, INC.
ROME DELAWARE CORPORATION
ROYAL BUILDING PRODUCTS (USA) INC.
ROYAL PLASTICS GROUP (U.S.A.) LIMITED
ROYAL WINDOWS AND DOOR PROFILES PLANT 13 INC.
ROYAL WINDOWS AND DOOR PROFILES PLANT 14 INC.

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