EXHIBIT 10.28

Revolving Credit Agreement

ThisREVOLVING CREDIT AGREEMENTis dated as of March 25, 2003 (as amended, supplemented or otherwise
modified from time to time, this "Agreement"), between UNION CARBIDE CORPORATION, a New York corporation
("Carbide" or "Borrower"), as borrower, and THE DOW CHEMICAL COMPANY, a Delaware corporation
("TDCC" or "Lender"), as lender.

W
I T N E S S E T H:

WHEREAS,
TDCC wishes to loan funds to Carbide from time to time and Carbide wishes to borrow such funds on the terms and conditions set forth herein;

NOW,
THEREFORE, in consideration of the premises and the covenants and agreements contained herein, the parties hereto hereby agree as follows:

ARTICLE I
DEFINITIONS, INTERPRETATION AND ACCOUNTING TERMS

Section 1.1.Defined Terms.As used in this Agreement, the following terms have the following meanings
(such meanings to be equally applicable to both the singular and plural forms of the terms defined):

"Account" has the meaning specified in the UCC.

"Affiliate" means, with respect to any Person, any other Person which, directly or indirectly, controls, is controlled by or is under
common control with such Person and each officer, director or general partner of such Person. For the purposes of this definition, "control" means the possession of the power to direct or cause the
direction of management and policies of such Person, whether through the ownership of voting securities, by contract or otherwise. For purposes hereof, Borrower and its Subsidiaries shall not be
deemed to be Affiliates of Lender and Lender's other Affiliates.

"Agreement" has the meaning specified in the preamble to this Agreement.

"Applicable Rate" means, as of any date of determination, LIBOR plus 2.5%.

"Approved Deposit Account" means each bank account established or maintained by Borrower with a bank acceptable to Lender for purposes of
receivables collection and subject to a Deposit Account Control Agreement.

"Asset Sale" has the meaning specified inSection 8.3.

"Bankruptcy Code" means Title 11, United States Code, as amended from time to time.

"Business Day" means a day of the year on which banks are not required or authorized to close in New York City.

"Capital Lease" means, with respect to any Person, any lease of property by such Person as lessee which would be accounted for as a
capital lease on a balance sheet of such Person prepared in conformity with GAAP.

"Capital Lease Obligations" means, with respect to any Person, the capitalized amount of all obligations of such Person or any of its
Subsidiaries under Capital Leases, as determined on a consolidated basis in conformity with GAAP.

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"Cash Equivalents" means (a) securities issued or fully guaranteed or insured by the United States government or any agency
thereof, (b) certificates of deposit, eurodollar time deposits, overnight bank deposits and bankers' acceptances of any commercial bank organized under the laws of the United States, any state
thereof, the District of Columbia, any foreign bank, or its branches or agencies (fully protected against currency fluctuations) which, at the time of acquisition, are rated at least "A-1"
by Standard & Poor's Rating Services ("S&P") or "P-1" by Moody's Investors Services, Inc.
("Moody's"), (c) commercial paper of an issuer rated at least "A-1" by S&P or "P-1" by Moody's, and (d) shares of
any money market fund that (i) has at least 95% of its assets invested continuously in the types of investments referred to in clauses (a) through (c) above, (ii) has net
assets of not less than $1,000,000,000 and (iii) is rated at least "A-1" by S&P or "P-1" by Moody's;provided, however,that the maturities of all obligations of the type specified in clauses (a) above shall not exceed 1 year and in clauses (b) and (c) above shall not exceed 270 days.

"Change of Control" means any of the following: (a) any person or group of persons (within the meaning of the Securities Exchange
Act of 1934, as amended) shall have acquired beneficial ownership (within the meaning of Rule 13d-3 promulgated by the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended) of a greater percentage of the issued and outstanding Voting Stock of Carbide than that held directly or indirectly by TDCC; and (b) Borrower shall have sold
or otherwise disposed of all or substantially all of the consolidated assets of the Borrower and its Subsidiaries.

"Code" means the Internal Revenue Code of 1986 (or any successor legislation thereto), as amended from time to time.

"Collateral" means all property and interests in property and proceeds thereof now owned or hereafter acquired by Borrower in or upon
which a Lien is granted under any of the Collateral Documents.

"Collateral Documents" means the Pledge and Security Agreement, the Subsidiary Guarantees and any other document executed and delivered by
Borrower or any of its Subsidiaries granting a Lien on any of such Person's property to secure payment of the Obligations of Borrower hereunder.

"Commitment" means the commitment of Lender to make Loans in the aggregate principal amount outstanding not to exceed $1,000,000,000 and
as such amount may be reduced pursuant to this Agreement.

"Constituent Documents" means, with respect to any Person, (i) the articles/certificate of incorporation (or the equivalent
organizational documents) of such Person, (ii) the by-laws (or the equivalent governing documents) of such Person and (iii) any document setting forth the manner of election
and duties of the directors or managing members of such Person (if any) and the designation, amount and/or relative rights, limitations and preferences of any class or series of such Person's Stock.

"Contractual Obligation" of any Person means any obligation, agreement, undertaking or similar provision of any Security issued by such
Person or of any agreement, undertaking, contract, lease, indenture, mortgage, deed of trust or other instrument (excluding any Loan Document) to which such Person is a party or by which it or any of
its property is bound or to which any of its properties is subject.

"Credit Enhancement" means any indemnity, letter of credit, guarantee or other credit enhancement or financial accommodation made or
extended by Lender in favor of a third party as security for obligations of Borrower or its Subsidiary to such third party.

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"Credit Enhancement Contingent Liabilities" means, at any time with respect to any Credit Enhancement, the amount of contingent
liabilities owed by Borrower to Lender at such time pursuant to the Reimbursement Agreement relating to such Credit Enhancement.

"Credit Enhancement Obligations" means, at any time with respect to any Credit Enhancement, the liability at such time of Borrower to
Lender with respect to such Credit Enhancement, whether or not any such liability is contingent, and includes the sum of all Reimbursement Obligations and Credit Enhancement Contingent Liabilities
relating to such Credit Enhancement Obligation.

"Credit Enhancement Request" has the meaning specified inSection 2.4(c).

"Customary Permitted Liens" means, with respect to any Person, any of the following Liens:



"Debt Issuance" means the incurrence of indebtedness for borrowed money by Carbide or any of its Subsidiaries, other than Intercompany
Indebtedness.

"Default" means any event which with the passing of time or the giving of notice or both would become an Event of Default.

"Deposit Account Control Agreement" has the meaning specified in the Pledge and Security Agreement.

"Document" has the meaning specified in the Pledge and Security Agreement.

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"Effective Date" has the meaning specified inSection 3.1.

"Equipment" has the meaning specified in the UCC.

"Equity Issuance" means the issue or sale of any Stock of Borrower or any of its Subsidiaries to any Person other than Borrower or any of
its Subsidiaries..

"Event of Default" has the meaning specified inSection 9.1.

"Existing Credit Agreement"means the Revolving Loan Agreement dated as of February 6, 2001, between Borrower and Lender, as
amended on July 1, 2002.

"Fair Market Value" means (a) with respect to any asset or group of assets (other than a marketable Security) at any date, the
value of the consideration obtainable in a sale of such asset at such date assuming a sale by a willing seller to a willing purchaser dealing at arm's length and arranged in an orderly manner over a
reasonable period of time having regard to the nature and characteristics of such asset, as reasonably determined by the Board of Directors of Borrower, or, if such asset shall have been the subject
of a relatively contemporaneous appraisal by an independent third party appraiser, the basic assumptions underlying which have not materially changed since its date, the value set forth in such
appraisal, and (b) with respect to any marketable Security at any date, the closing sale price of such Security on the Business Day next preceding such date, as appearing in any published list
of any national securities exchange or the Nasdaq Stock Market or, if there is no such closing sale price of such Security, the final price for the purchase of such Security at face value quoted on
such business day by a financial institution of recognized standing which regularly deals in securities of such type selected by Lender.

"GAAP" means generally accepted accounting principles in the United States of America as in effect from time to time set forth in the
opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and the statements and pronouncements of the Financial Accounting Standards
Board, or in such other statements by such other entity as may be in general use by significant segments of the accounting profession, which are applicable to the circumstances as of the date of
determination.

"General Intangible" has the meaning specified in the UCC.

"Governmental Authority" means any nation or government, any state or other political subdivision thereof and any entity exercising
executive, legislative, judicial, regulatory or administrative functions of or pertaining to government.

"Guaranty Obligation" means, as applied to any Person, any direct or indirect liability, contingent or otherwise, of such Person with
respect to any Indebtedness of another Person, if the purpose or intent of such Person in incurring the Guaranty Obligation is to provide assurance to the obligee of such Indebtedness that such
Indebtedness will be paid or discharged, or that any agreement relating thereto will be complied with, or that any holder of such Indebtedness will be protected (in whole or in part) against loss in
respect thereof including, (a) the direct or indirect guaranty, endorsement (other than for collection or deposit in the ordinary course of business), co-making, discounting with
recourse or sale with recourse by such Person of Indebtedness of another Person and (b) any liability of such Person for Indebtedness of another Person through any agreement (contingent or
otherwise) (i) to purchase, repurchase or otherwise acquire such Indebtedness or any security therefor, or to provide funds for the payment or discharge of such Indebtedness (whether in the
form of a loan, advance, stock purchase, capital contribution or otherwise), (ii) to maintain the solvency or any balance sheet item, level of income or financial condition of another Person,
(iii) to make take-or-pay or similar payments, if required, regardless of non-performance by any other party or parties to an agreement, (iv) to
purchase, sell or lease (as lessor or lessee) property, or to purchase or sell services, primarily for the purpose of enabling the debtor to make payment of such Indebtedness or to assure the holder
of such

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Indebtedness against loss, or (v) to supply funds to or in any other manner invest in such other Person (including to pay for property or services irrespective of whether such property is
received or such services are rendered), if in the case of any agreement described under subclause (i), (ii), (iii), (iv) or (v) of clause (b) of this sentence the primary purpose
or intent thereof is as described in the preceding sentence. The amount of any Guaranty Obligation shall be equal to the amount of the Indebtedness so guaranteed or otherwise supported.

"Indebtedness" of any Person means without duplication (a) all indebtedness of such Person for borrowed money, (b) all
obligations of such Person evidenced by notes, bonds, debentures or similar instruments or which bear interest, (c) all reimbursement obligations and other obligations with respect to letters
of credit, bankers' acceptances, surety bonds and performance bonds, whether or not matured, (d) all indebtedness for the deferred purchase price of property or services, other than trade
payables and accrued expenses incurred in the ordinary course of business which are not overdue, (e) all indebtedness of such Person created or arising under any conditional sale or other title
retention agreement with respect to property acquired by such Person (even though the rights and remedies of the seller or lender under such agreement in the event of default are limited to
repossession or sale of such property), (f) all Capital Lease Obligations of such Person, (g) all Guaranty Obligations of such Person, (h) all obligations of such Person to
purchase, redeem, retire, defease or otherwise acquire for value any Stock or Stock Equivalents of such Person, valued, in the case of redeemable preferred stock, at the greater of its voluntary or
involuntary liquidation preference plus accrued and unpaid dividends, and (i) all Indebtedness referred to above secured by (or for which the holder of such Indebtedness has an existing right,
contingent or otherwise, to be secured by) any Lien upon or in property (including Accounts and General Intangibles) owned by such Person, even though such Person has not assumed or become liable for
the payment of such Indebtedness.

"Indemnitees" has the meaning specified inSection 10.3.

"Indentures" means, collectively, (a) the Indenture dated as of June 1, 1995 between Borrower and Chemical Bank, as trustee,
as amended, and (b) the Indenture dated as of August 1, 1992 between Union Carbide Plastics and Chemical Company, Inc., as issuer, Carbide (as guarantor) and Chemical Bank, as
trustee, as amended, in each case as further amended from time to time.

"Insurance Event" means any event that results in the Borrower or its Subsidiaries receiving Net Cash Proceeds of the type described in
clause (b) of the definition of Net Cash Proceeds.

"Intercompany Indebtedness" means Indebtedness owed by Borrower to one of its Subsidiaries or to Borrower by one of its Subsidiaries.

"Inventory" has the meaning specified in the UCC.

"Investment" means, with respect to any Person, (a) any purchase or other acquisition by that Person of (i) any Security
issued by, (ii) a beneficial interest in any Security issued by, or (iii) any other equity ownership interest in, any other Person, (b) any purchase by that Person of all or a
significant part of the assets of a business conducted by another Person, (c) any loan, advance (other than prepaid expenses, accounts receivable and similar items made or incurred in the
ordinary course of business as presently conducted), or capital contribution by that Person to any other Person, including all Indebtedness to such Person arising from a sale of property by such
Person other than in the ordinary course of its business and (d) any deposit with a financial institution.

"Investment Property" has the meaning specified in the Pledge and Security Agreement.

"IRS" means the Internal Revenue Service of the United States or any successor thereto.

"LIBOR" means, with respect to any calculation of interest underSection 2.11(a),
the rate for deposits in U.S. Dollars for a period of one month which appears on the Telerate page 3750 as of

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11:00 a.m., London time, on the date that is two Business Days prior to the first day of the applicable period for which such interest is payable.

"Lien" means any mortgage, deed of trust, pledge, hypothecation, assignment, charge, deposit arrangement, encumbrance, lien (statutory or
other), security interest or preference, priority or other security agreement or preferential arrangement of any kind or nature whatsoever intended to assure payment of any Indebtedness or other
obligation, including any conditional sale or other title retention agreement, the interest of a lessor under a Capital Lease, any financing lease having substantially the same economic effect as any
of the foregoing, and the filing of any financing statement under the Uniform Commercial Code or comparable law of any jurisdiction naming the owner of the asset to which such Lien relates as debtor
but excluding any right of set-off.

"Loan" means any loan made by Lender under this Agreement, it being agreed that, except as provided in Section 2.4(f), a Credit Enhancement Obligation shall not be
a Loan.

"Loan Availability" means, as of any time, the Commitment in effect at such timelessthe
sum of (a) the aggregate principal amount of Loans outstanding at such time and (b) the aggregate amount of Credit Enhancement Obligations outstanding as of such time.

"Loan Documents" means, collectively, this Agreement, any and all Notes, the Collateral Documents, any and all Reimbursement Agreements
(and any other agreements between Borrower and Lender related to such Reimbursement Agreements), and each certificate, agreement or document executed by Borrower and delivered to Lender in connection
with or pursuant to any of the foregoing.

"Material Adverse Change" means a material adverse change in any of (a) the business, condition (financial or otherwise),
operations, performance, prospects, assets, liabilities or properties of Borrower and its Subsidiaries, taken as a whole, (b) the legality, validity or enforceability of any Loan Document,
(c) the perfection or priority of the Liens granted pursuant to the Collateral Documents (except as expressly permitted hereby or thereby), (d) the ability of Borrower to repay the
Obligations, or (e) the rights and remedies of Lender under the Loan Documents.

"Material Adverse Effect" means an effect or circumstances that results in or causes, or could reasonably be expected to result in or
cause a Material Adverse Change.

"Net Cash Proceeds" means (a) proceeds received by Borrower or its Subsidiaries after the Effective Date in cash or Cash
Equivalents from any Asset Sale (other than Asset Sales permitted underSection 8.3), net of (x) the reasonable cash costs of sale,
assignment or other disposition, and (y) any amount required to be paid or prepaid on Indebtedness (other than the Obligations) secured by the assets subject to such Asset Sale; provided, however,that the evidence of each of (x) and (y) are provided to Lender in form and substance satisfactory to it;
(b) proceeds of insurance (other than proceeds in respect of business interruption) covering property constituting Collateral (net of (i) reasonable expenses incurred directly in the
collection thereof and (ii) (to the extent permitted hereby) contractually required payments of Indebtedness (other than the Obligations) secured by a Lien on the insured property (that is
prior to any Lien granted under the Collateral Documents or is otherwise permitted by this Agreement) on account of the loss of or damage to any such assets or property, and payments of compensation
for any such assets or property taken by expropriation, condemnation or eminent domain, to the extent such proceeds or payments exceed $100 million in the aggregate; and (c) proceeds
received after the Effective Date by Borrower or its Subsidiaries in cash or Cash Equivalents from (i) any Equity Issuance, or (ii) any Debt Issuance (except for Indebtedness permitted
under clauses (a) through (f) ofSection 8.1), in each case net of brokers' and advisors' fees and other costs incurred in
connection with such transaction;provided, however,that satisfactory evidence of such costs is provided to Lender.

"Obligations" means all advances, debts, liabilities, obligations, covenants and duties owing by Borrower to Lender of every type and
description, arising under this Agreement or under any other

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Loan Document, including all fees and expenses and all interest, charges, expenses, fees, attorneys' fees and disbursements and other sums chargeable to Borrower hereunder, whether direct or
indirect, absolute or contingent, or due or to become due.

"Participation Agreement" means the Participation Agreement dated as of April 1, 2000, with respect to Union Carbide Trust
No. 2000-A, as amended from time to time.

"Permit" means any permit, approval, authorization, license, variance or permission required from a Governmental Authority under an
applicable Requirement of Law.

"Person" means an individual, partnership, corporation (including a business trust), joint stock company, estate, trust, limited liability
company, unincorporated association, joint venture or other entity, or a Governmental Authority.

"Pledge and Security Agreement" means the Pledge and Security Agreement dated as of the date hereof, in substantially the form of Exhibit A, between Borrower and
Lender, as amended from time to time.

"Reimbursement Agreement" has the meaning specified inSection 2.4(e).

"Reimbursement Obligations" means, at any time with respect to any Credit Enhancement, all matured reimbursement or repayment obligations
of Borrower to Lender then owing under the Reimbursement Agreement relating to such Credit Enhancement as a result of Lender having advanced funds to the beneficiary of such Credit Enhancement.

"Remaining Contingent Liabilities" has the meaning specified inSection 9.3.

"Replacement Note" has the meaning specified inSection 3.1(b).

"Requirement of Law" means, with respect to any Person, all federal, provincial, state, local and foreign laws, rules and regulations,
orders, judgments, decrees and other determinations of any Governmental Authority or arbitrator, applicable to or binding upon such Person or any of its property or to which such Person or any of its
property is subject.

"Responsible Officer" means, with respect to any Person, any of the principal executive officers, managing members or general partners of
such Person, but in any event, with respect to financial matters, the chief financial officer, treasurer or controller of such Person.

"Scheduled Termination Date" means March 25, 2004.

"SEC Reports" has the meaning specified inSection 4.3.

"Securitization Documents" means each of (a)(i) the Receivables Contribution and Sale Agreement dated as of September 30,
1997, as amended and restated as of December 21, 2001, among Carbide and TDCC, each as a seller, and Chemars, Inc., as purchaser, and (ii) the other securitization documents
related thereto, including the Receivables Purchase and Sale Agreement dated as of September 30, 1997, as amended and restated as of December 21, 2001, among Chemars Inc., TDCC,
CIESCO, L.P., and Citicorp North America, Inc., as agent and (b)(i) the Receivables Sale Agreement dated as of June 15, 2001 between Carbide, as originator, and Chemars II LLC, as
buyer and (ii) the other securitization documents related thereto, including the Receivables Purchase Agreement dated as of June 15, 2001, as amended as of December 21, 2001,
among Chemars IL LLC, TDCC, as servicer,
Preferred Receivables Funding Corporation, the financial institutions from time to time party thereto as "Financial Institutions" and Bank One, NA, as agent.

"Security" means any Stock, Stock Equivalent, voting trust certificate, bond, debenture, note or other evidence of Indebtedness, whether
secured, unsecured, convertible or subordinated, or any certificate of interest, share or participation in, or any temporary or interim certificate for the purchase

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or acquisition of, or any right to subscribe to, purchase or acquire, any of the foregoing, but shall not include any evidence of the Obligations.

"Stock" means shares of capital stock (whether denominated as common stock or preferred stock), beneficial, partnership or membership
interests, participations or other equivalents (regardless of how designated) of or in a corporation, partnership, limited liability company or equivalent entity, whether voting or
non-voting.

"Stock Equivalents" means all securities convertible into or exchangeable for Stock and all warrants, options or other rights to purchase
or subscribe for any Stock, whether or not presently convertible, exchangeable or exercisable.

"Subsidiary" means, with respect to any Person, any affiliated entity that is controlled by such Person, directly or indirectly, through
one or more intermediaries, where "control" means the possession, direct or indirect, of the power to direct or cause the direction of the management and policies of such Person.

"Subsidiary Guarantee" means the Subsidiary Guarantee in favor of Lender to be executed and delivered by the Subsidiary Guarantors,
substantially in the form ofExhibit C.

"Subsidiary Guarantors" means, collectively, the Subsidiaries of Borrower identified on Schedule 1hereto.

"Subsidiary Pledge Agreement" means the Subsidiary Pledge Agreement to be entered into among Lender and the Subsidiary Guarantors (other
than Union Carbide Chemicals & Plastics Technology Corporation), substantially in the form ofExhibit C-1.

"Termination Date" means the earliest of (a) the Scheduled Termination Date, (b) 30 days following written notice of
termination from the Lender pursuant toSection 2.3(b), (c) the date of termination of
the Commitment by the Borrower pursuant toSection 2.3(a), and (d) the date on which the Obligations become due and payable pursuant to Section 9.2.

"UCC" has the meaning specified in the Pledge and Security Agreement.

"Voting Stock" means Stock of any Person having ordinary power to vote in the election of members of the board of directors, managers,
trustees or other controlling Persons, of such Person (irrespective of whether, at the time, Stock of any other class or classes of such entity shall have or might have voting power by reason of the
happening of any contingency).

Section 1.2.Computation of Time Periods.In this Agreement, in the computation of periods of time from a
specified date to a later specified date, the word "from" means "from and including" and the words "to" and "until" each mean "to but excluding" and the word "through" means "to and including."

Section 1.3.Certain Terms..



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ARTICLE II
LOANS

Section 2.1.Commitment.On the terms and subject to the conditions contained in this Agreement, Lender
agrees to make loans (each a "Loan") to Borrower from time to time on any Business Day during the period from the Effective Date until the Termination
Date in an aggregate amount not to exceed at any time outstanding the Commitment;provided, however,that at no time shall Lender be obligated to make a
Loan to Borrower to the extent that the aggregate principal amount of Loans outstanding, after giving effect to such Loan, would exceed the Loan Availability at such time. Within the limits of the
Commitment amounts of Loans repaid may be reborrowed under thisSection 2.1.

Section 2.2.Borrowing Procedures.Subject to the terms and conditions set forth herein, each Loan shall
be made in accordance with the intercompany cash management program then in effect between Borrower and Lender. At any time following April 25, 2003, Lender may, by written notice to Borrower,
require Borrower to deliver to Lender at least 10 days' written notice (and no more than 20 days' written notice) of any and all requested Loans or Credit Enhancements in excess of
$15,000,000 (whether in one Loan or Credit Enhancement or in a series of related Loans or Credit Enhancements) that are to be used for payments to be made to Persons other than Lender and its
Affiliates. Any such notice shall state the purpose for such requested Loan or Credit Enhancement (and with respect to any Credit Enhancement, any other information required to be provided pursuant to Section 2.4(c)below). In the event Lender elects not to make any of such Loans or Credit Enhancements to Borrower, Lender agrees to give
Borrower notice of such election at least 5 days prior to the requested borrowing date.

Section 2.3.Reduction and Termination of Commitment



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Section 2.4.Credit Enhancements.



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Any
action taken or omitted to be taken by Lender under or in connection with any Credit Enhancement shall not form the basis of any resulting liability of Lender to Borrower. In determining whether
documents presented under a Credit Enhancement comply with the terms thereof, Lender may accept documents that appear on their face to be in order, without responsibility for further investigation,
regardless of any notice or information to the contrary and, in making any payment under any Credit Enhancement, Lender may rely exclusively on the documents presented to it under such Credit
Enhancement as to any and all matters set forth therein, including reliance on the amount therein requested to be paid under such Credit Enhancement, whether or not the amount due to the beneficiary
thereunder equals such amount and whether or not any document presented pursuant to such Credit Enhancement proves to be insufficient in any respect, if such document on its face appears to be in
order.

Section 2.5.Repayment of Loans.Borrower shall repay the entire unpaid principal amount of the Loans on
the Termination Date or on such earlier date that the Loans become due and payable hereunder.

Section 2.6.Evidence of Debt, Obligations of Borrower.



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Section 2.7.Optional Prepayments.Borrower may (in addition to the obligations under Section 2.8), prepay the outstanding
principal amount of the Loans at any time in whole or in part without prepayment premium or penalty.

Section 2.8.Mandatory Prepayments.



Section 2.9.Interest



Section 2.10.Fees



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Section 2.11.Payments and Computations; Protective Advances



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ARTICLE III
CONDITIONS TO EFFECTIVENESS OF THIS AGREEMENT

Section 3.1.Conditions Precedent to the Effectiveness of this Agreement.This Agreement shall become
effective on the date (the "Effective Date") on which all of the following conditions precedent have been first satisfied (unless waived by Lender or
the time for satisfaction thereof has been extended by Lender):



Section 3.2.Conditions Precedent to Each Loan and Credit Enhancement.The obligation of Lender to make
any Loan or provide any Credit Enhancement on any date (including the Effective Date) is subject to the satisfaction of all of the following conditions precedent (unless waived by Lender or the time
for satisfaction thereof has been extended by Lender):



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The
acceptance by Borrower of the proceeds of each Loan made in accordance withSection 2.2, and each submission by Borrower of a Credit
Enhancement Request and the issuance of each Credit Enhancement requested therein, shall be deemed to constitute a representation and warranty by Borrower as to the matters specified in Section 3.2(b)on the date of the making of such Loan or Credit Enhancement.

ARTICLE IV
REPRESENTATIONS AND WARRANTIES

To induce Lender to enter into this Agreement, Borrower represents and warrants to Lender that, on and as of the Effective Date, after giving effect to the
making, or the continuation, of the Loans on the Effective Date and on and as of each date as required bySection 3.2(b)(i):

Section 4.1.Corporate Existence; Compliance with Law.Borrower (a) is duly organized, validly
existing and in good standing under the laws of the State of New York; (b) is duly qualified as a foreign corporation and in good standing under the laws of the States of Connecticut, West
Virginia, Louisiana and Texas; (c) has all requisite power and authority and the legal right to own, pledge, mortgage and operate its properties, to lease the property it operates under lease
and to conduct its business as now or currently proposed to be conducted, except where the failure to do so would not in the aggregate have a Material Adverse Effect; (d) is in compliance with
its Constituent Documents; (e) is in compliance with all applicable Requirements of Law except where the failure to be in compliance would not in the aggregate have a Material Adverse Effect;
and (f) has all necessary licenses, permits, consents or approvals from or by, has made all necessary filings with, and has given all necessary notices to, each Governmental Authority having
jurisdiction, to the extent required for the ownership, operation and conduct referred to in clause (c) above, except for licenses, permits, consents, approvals or filings which can be obtained
or made by the taking of ministerial action to secure the grant or transfer thereof or the failure to obtain or make would not in the aggregate have a Material Adverse Effect.

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Section 4.2.Corporate Power; Authorization; Enforceable Obligations



Section 4.3.Litigation.Except for litigation disclosed in any report, schedule, form or registration
statement filed by Borrower with the Securities and Exchange Commission (collectively, the"SEC Reports"), there are no pending or, to the knowledge of
Borrower, threatened actions, investigations or proceedings affecting Borrower or any of its Subsidiaries before any court, Governmental Authority or arbitrator which would reasonably be expected to
be adversely determined and which, if adversely determined, would have a Material Adverse Effect. The performance of any action by Borrower required or contemplated by any of the Loan Documents is not
restrained or enjoined (either temporarily, preliminarily or permanently).

Section 4.4.No Defaults



Section 4.5.Use of Proceeds.The proceeds of the Loans are being used by Borrower and its Subsidiaries
solely for (i) their respective businesses consistent with past custom and practice and arising out of the Borrower and its Subsidiaries' normal operation of their respective businesses, or

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(ii) the purposes described onSchedule 3, and, except as set forth onSchedule 3,
shall not be used for any extraordinary payments of Borrower or any of its Subsidiaries.

ARTICLE V
[INTENTIONALLY OMITTED]

ARTICLE VI
REPORTING COVENANTS

As long as any of the Obligations (in respect of Loans, interest or fees thereon and expenses related thereto) or the Commitments remain outstanding, unless the
Lender otherwise consents in writing, Borrower agrees with Lender that:

Section 6.1.Default Notices.As soon as practicable, and in any event within two Business Days after a
Responsible Officer of Borrower has actual knowledge of the existence of any Default, Event of Default or other event which has had a Material Adverse Effect or which has any reasonable likelihood of
causing or resulting in a Material Adverse Change, Borrower shall give Lender notice specifying the nature of such Default or Event of Default or other event, including the anticipated effect thereof,
which notice, if given by telephone, shall be promptly confirmed in writing on the next Business Day.

Section 6.2.Asset Sales.Prior to any Asset Sale (other than any Asset Sale permitted by Section 8.3), Borrower shall send
Lender a notice (a) describing such Asset Sale or the nature and material terms and conditions of such
transaction and (b) stating the estimated Net Cash Proceeds anticipated to be received by Borrower or any of its Subsidiaries, and (c) identifying the assets being sold and whether they
constitute Collateral.

Section 6.3.Other Information.Borrower will provide Lender with such other information respecting the
business, properties, condition, financial or otherwise, or operations of Borrower or any of its Subsidiaries as Lender may from time to time reasonably request.

ARTICLE VII
AFFIRMATIVE COVENANTS

As long as any of the Obligations (in respect of Loans, interest or fees thereon and expenses related thereto) or the Commitments remain outstanding, unless the
Lender otherwise consents in writing, Borrower agrees with Lender that:

Section 7.1.Preservation of Corporate Existence, EtcBorrower shall, and shall cause each of its
Subsidiaries to, preserve and maintain its corporate, partnership, limited liability company or other existence, rights (charter and statutory) and franchises, except (i) as permitted by Sections 8.3and8.4and (ii) the abandonment of such existence, rights and franchises which are
no longer necessary or desirable to the conduct of the business of Borrower or its Subsidiaries and (iii) as to which the abandonment of such existence, rights or franchises would not in the
aggregate have a Material Adverse Effect.

Section 7.2.Compliance with Laws, Etc.Borrower shall, and shall cause each of its Subsidiaries to,
comply with all applicable Requirements of Law, Contractual Obligations and Permits (and maintain in full force and effect all contracts constituting such Contractual Obligations and such Permits),
except where the failure so to comply would not in the aggregate have a Material Adverse Effect.

Section 7.3.Conduct of Business.Borrower shall, and shall cause each of its Subsidiaries to,
(a) conduct its business in the ordinary course and substantially in accordance with past practice and (b) use its reasonable efforts, in the ordinary course and substantially in
accordance with past practice,

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to preserve its business and the goodwill and business of the customers, advertisers, suppliers and others having business relations with Borrower or any of its Subsidiaries, except in each case
where the failure to comply with the covenants in each of clauses (a) and (b) above would not in the aggregate have a Material Adverse Effect.

Section 7.4.Access.Borrower shall from time to time, permit, and shall cause each of its Subsidiaries
to permit, Lender or any of its agents or representatives, within one Business Day after written notification of the same (except that during the continuance of an Event of Default, no such notice
shall be required) to (a) examine and make copies of and abstracts from the records and books of account of Borrower and each of its Subsidiaries, (b) visit the properties of Borrower
and each of its Subsidiaries, (c) discuss the affairs, finances and accounts of Borrower and each of its Subsidiaries with any of their respective officers or directors, and
(d) communicate directly with Borrower's independent certified public accountants;provided, however,that Borrower may participate in such
communication unless a Default or Event of Default has occurred and is continuing. Borrower shall authorize its independent certified public accountants (and any of its Subsidiaries' accountants) to
disclose to Lender any and all financial statements and other information of any kind, as Lender reasonably requests from Borrower or any of its Subsidiaries and which such accountants may have with
respect to the business, financial condition, results of operations or other affairs of Borrower or any of its Subsidiaries.

Section 7.5.Keeping of Books.Borrower shall keep, and shall cause each of its Subsidiaries to keep,
proper books of record and account, in which full and correct entries shall be made in conformity with GAAP of all financial transactions and the assets and business of Borrower and each such
Subsidiary.

Section 7.6.Application of Proceeds.Without the prior written consent of Lender, Borrower and its
Subsidiaries shall use the entire amount of the proceeds of the Loans as provided inSection 4.5.

Section 7.7.Further Assurances.Promptly upon the reasonable request by Lender, Borrower shall, and
shall ensure that each of its Subsidiaries shall, take such action as Lender may request (including the execution, amendment, delivery, filing and registration of any Loan Document or other document,
certificate, agreement or instrument) in order to correct any material defect or error which may be discovered which impairs, or may fail to provide, the intended legality, effectiveness, accuracy,
perfection or priority of any Loan Document. As soon as reasonably practicable after the Effective Date, Borrower shall obtain the consents specified in Schedule 2.

Section 7.8.Approved Deposit Accounts and Cash Management System



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ARTICLE VIII
NEGATIVE COVENANTS

As long as any of the Obligations (in respect of Loans, interest or fees thereon and expenses related thereto) or the Commitments remain outstanding, unless the
Lender otherwise consents in writing, Borrower agrees with Lender that:

Section 8.1.Indebtedness.Borrower will not, and will not permit any of its Subsidiaries to, directly or
indirectly create, incur, assume or otherwise become or remain directly or indirectly liable with respect to any Indebtedness except:



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Section 8.2.Liens, Etc.Borrower will not, and will not permit any of its Subsidiaries to, create or
suffer to exist, any Lien upon or with respect to any of its properties or assets, whether now owned or hereafter acquired, or assign, or permit any of its Subsidiaries to assign, any right to receive
income, except for:



Section 8.3.Sale of Assets.Borrower will not, and will not permit any of its Subsidiaries to, sell,
convey, transfer, lease or otherwise dispose of, any of its assets or any interest therein (including the sale or factoring at maturity or collection of any accounts) to any Person, or permit or
suffer any other Person to acquire any interest in any of its assets (any such disposition being an "Asset Sale"), except:



Section 8.4.Restrictions on Subsidiary Distributions; No New Negative Pledge.Other than pursuant to the
Loan Documents and any agreements governing any purchase money Indebtedness or Capital Lease Obligations permitted by clause (b), (c), or (d) of Section 8.1(in which latter case, any
prohibition or limitation shall only be effective against the assets financed thereby) or in connection
with an Asset Sale which is permitted underSection 8.3(in respect only of the assets subject thereto) or pursuant to customary
anti-assignment provisions contained in leases or licenses permitted under this Agreement or as otherwise contained, at the date hereof, in the Indentures, the Participation

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Agreement, the Securitization Documents or in or any other agreement by which the Borrower or any of its Subsidiaries is bound that is in effect as of the Effective Date, Borrower will not, and will
not permit any of its Subsidiaries to, (a) agree to enter into or suffer to exist or become effective any consensual encumbrance or restriction of any kind on the ability of such Subsidiary to
pay dividends or make any other distribution or transfer of funds or assets or make loans or advances to or other Investments in, or pay any Indebtedness owed to, Borrower or any other Subsidiary of
Borrower or (b) enter into or suffer to exist or become effective any agreement which prohibits or limits the ability of Borrower or any Subsidiary to create, incur, assume or suffer to exist
any Lien upon any of its property, assets or revenues, whether now owned or hereafter acquired, to secure the Obligations, including any agreement which requires other Indebtedness or Contractual
Obligations to be equally and ratably secured with the Obligations.

Section 8.5.Payment of Junior Indebtedness.Borrower will not, and will not permit any of its
Subsidiaries to, purchase, redeem, retire or otherwise acquire for value, or set apart any money for a sinking, defeasance or other analogous fund for the purchase, redemption, retirement or other
acquisition of, or make any voluntary payment or prepayment of the principal of or interest on, or any other amount owing in respect of Indebtedness of the Borrower or its Subsidiaries, except for
regularly scheduled principal or interest payments owing with respect to Indebtedness permitted underSection 8.1(a), (b), (d),(f)or(g)or payments owing in respect of Capital
Lease Obligations permitted underSection 8.1.

ARTICLE IX
EVENTS OF DEFAULT

Section 9.1.Events of Default.Each of the following events shall be an Event of Default:



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Section 9.2.Remedies



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Section 9.3.Actions in Respect of Credit Enhancements.Upon the Termination Date, the Borrower shall pay
to Lender in immediately available funds at Lender's office referred to inSection 10.5, for deposit in a cash collateral account (the
"Cash Collateral Account") to be maintained in the name of Lender at such place as shall be designated by Lender, an amount equal to (a) 110% of
the sum of all outstanding Credit Enhancement Contingent Liabilities which are denominated in U.S. dollars and (b) 125% of the sum of all outstanding Credit Enhancement Contingent Liabilities
(if any) which are denominated in currencies other than U.S. dollars. Lender may, from time to time after funds are deposited in the Cash Collateral Account, apply funds then held in the Cash
Collateral Account to the payment of any amounts, in accordance withSection 2.11(d)(iii) and (iv), as shall have become or shall become
due and payable by Borrower to Lender in respect of such Credit Enhancement Contingent Liabilities. Lender shall promptly give written notice of any such application;provided,
however,that the failure to give such written notice shall not invalidate any such application. At the end of each calendar quarter following the establishment of the Cash
Collateral Account, Lender shall determine the aggregate amount of all Credit Enhancement Contingent Liabilities outstanding at the end of such calendar quarter (the "Remaining
Contingent Liabilities") and, if the cash then on deposit in the Cash Collateral Account exceeds an amount equal to the sum of (a) 110% of the sum of all Remaining
Contingent Liabilities which are denominated in U.S. dollars and (b) 125% of the sum of all Remaining Contingent Liabilities (if any) which are denominated in currencies other than U.S.
dollars, Lender shall release such excess to Borrower within 30 days of the end of such calendar quarter. Any determination of Remaining Contingent Liabilities hereunder shall be conclusive and
binding for all purposes, absent manifest error. Except as provided in the foregoing sentence, neither Borrower nor any Person claiming on behalf of or through Borrower shall have any right to
withdraw any of the funds held in the Cash
Collateral Account at any time prior to the termination of all outstanding Credit Enhancements and the payment in full of all then outstanding and payable monetary Obligations, but thereafter any
amounts remaining in the Cash Collateral Account shall be for the sole account of Borrower.

ARTICLE X
MISCELLANEOUS

Section 10.1.Amendment, Waivers, Etc.No amendment, waiver or consent shall, unless in writing and
signed by the party against whom enforcement is sought, affect the rights or obligation of such party under this Agreement or the other Loan Documents.

Section 10.2.Expenses



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Section 10.3.Indemnities



Section 10.4.Limitation of Liability.Borrower agrees that no Indemnitee shall have any liability
(whether direct or indirect, in contract, tort or otherwise) to Borrower or any of its Subsidiaries or any of their present or future equity holders or creditors for or in connection with the
transactions contemplated hereby and in the other Loan Documents.

Section 10.5.Right of Set-off.Lender is hereby authorized at any time and from time to
time, to the fullest extent permitted by law, to set off and apply any and all funds at any time held and other indebtedness or other amounts at any time owing by Lender or such Affiliates to or for
the credit or the account of Borrower (or any Subsidiary Guarantor) against any and all of the Obligations now or hereafter existing whether or not Lender shall have made any demand under this
Agreement or any other Loan Document and although such Obligations may be unmatured. Lender agrees promptly to notify Borrower (and, if applicable, such Subsidiary Guarantor) after any such
set-off and application is made by Lender;provided, however,that the failure to give such notice shall not affect the validity of such
set-off and application. The rights of Lender under thisSection 10.5are in addition to the other

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rights and remedies (including other rights of set-off) which Lender may have. In the event any amount is set-off against any unmatured Credit Enhancement Obligation, the
amount set-off against such unmatured Credit Enhancement Obligation shall be used to cash collateralize such Credit Enhancement Obligation in accordance with Section 9.3.

Section 10.6.Notices, Etc.All notices, demands, requests and other communications provided for in this
Agreement shall be given in writing and addressed to the party to be notified as follows:



or
at such other address as shall be notified in writing to Borrower and Lender. All such notices and communications shall be effective upon personal delivery (if delivered by hand, including any
overnight courier service), or when deposited in the mails (if sent by mail);provided, however,that notices and communications to Lender pursuant to Article IIorIXshall not be effective until received by Lender.

Section 10.7.No Waiver; Remedies.No failure on the part of Lender to exercise, and no delay in
exercising, any right hereunder shall operate as a waiver thereof; nor shall any single or partial exercise

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of any such right preclude any other or further exercise thereof or the exercise of any other right. The remedies herein provided are cumulative and not exclusive of any remedies provided by law.

Section 10.8.Binding Effect.This Agreement shall become effective on the Effective Date and thereafter
this Agreement shall be binding upon and inure to the benefit of Borrower and Lender and their respective successors and assigns, except that Borrower shall not have the right to assign its rights
hereunder or any interest herein without the prior written consent of Lender.

Section 10.9.Governing Law.This Agreement and the rights and obligations of the parties hereto shall be
governed by, and construed and interpreted in accordance with, the law of the State of New York.

Section 10.10.Submission to Jurisdiction.Any legal action or proceeding with respect to this Agreement
or any other Loan Document may be brought in the courts of the State of New York or of the United States of America for the Southern District of New York, and, by execution and delivery of this
Agreement, the Borrower hereby accepts for itself and in respect of its property, generally and unconditionally, the jurisdiction of the aforesaid courts. The parties hereto hereby irrevocably waive
any objection, including any objection to the laying of venue or based on the grounds of forum non conveniens, which any of them may now or hereafter have to the bringing of any such action or
proceeding in such respective jurisdictions.

Section 10.11.Waiver of Jury Trial.EACH OF THE LENDER AND BORROWER IRREVOCABLY WAIVES TRIAL BY JURY IN
ANY ACTION OR PROCEEDING WITH RESPECT TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT.

Section 10.12.Marshaling; Payments Set Aside.Lender shall not be under any obligation to marshal any
assets in favor of Borrower or any other party. To the extent that Borrower makes a payment or payments to Lender in respect of Obligations or Lender receives payment from the proceeds of the
Collateral or exercise their rights of setoff, and such payment or payments or the proceeds of such enforcement or setoff or any part thereof are subsequently invalidated, declared to be fraudulent or
preferential, set aside or required to be repaid to a trustee, receiver or any other party, then to the extent of such recovery, the obligation or part thereof originally intended to be satisfied, and
all Liens, right and remedies therefor, shall be revived and continued in full force and effect as if such payment had not been made or such enforcement or set-off had not occurred.

Section 10.13.Section Titles.The Section titles contained in this Agreement are and shall be without
substantive meaning or content of any kind whatsoever and are not a part of the agreement between the parties hereto.

Section 10.14.Execution in Counterparts.This Agreement may be executed in any number of counterparts
and by different parties in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall 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 attached to the same document.

Section 10.15.Entire Agreement.This Agreement, together with all of the other Loan Documents and all
certificates and documents delivered hereunder or thereunder, embodies the entire agreement of the parties and supersedes all prior agreements and understandings relating to the subject matter hereof.

[SIGNATURE
PAGES FOLLOW]

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IN WITNESS WHEREOF, the parties hereto have caused this Revolving Credit Agreement to be executed by their respective officers thereunto duly authorized, as of the date first above
written.

| |  | Borrower:                
| |  | -------------------------
| |  | UNION CARBIDE CORPORATION
| |  | By:                      
| |  | Lender:                  
| |  | THE DOW CHEMICAL COMPANY 
| |  | By:                      

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Schedule 1  Subsidiary Guarantors

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Schedule 2  Required Consents

1.    UCC
must obtain the consent of Petrochemical Industries Company K.S.C. in order to pledge its interest in EQUATE Petrochemical Company K.S.C.
("EQUATE") to TDCC.

2.    UCC
must obtain the consent of Samsung Fine Chemicals Co., Ltd. and BP Chemicals (Korea) Limited in order pledge its shares in Asian Acetyls Co., Ltd.
("Asian Acetyls") to TDCC.

3.    UCC
must obtain the consent of Exxon Corporation in order to pledge its interest in the shares of Union Carbide Subsidiary C, Inc. to TDCC.

4.    Any
consent required in the financing documents related to (i) EQUATE, (ii) Asian Acetyls (iii) UOP LLC, (iv) Nippon Unicar Co., Ltd.
(v) Univation Technologies, LLC and (vi) Optimal Glycols (Malaysia) Sdn. Bhd., Optimal Chemicals (Malaysia) Sdn. Bhd. and Optimal Olefins (Malaysia) Sdn. Bhd.

5.    Such
actions as foreign counsel advises are necessary for the perfection of interests in non-U.S. entities.

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Schedule 3  Approved Uses of Proceeds

1.    Payment
of Reimbursement Obligations to Lender in respect of the following Credit Enhancements to be issued by Lender:



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EXHIBIT A    FORM OF PLEDGE AND SECURITY AGREEMENT

ThisPLEDGE AND SECURITY AGREEMENTis dated as of March 25, 2003, by UNION CARBIDE CORPORATION, a New York
corporation ("Carbide" or "Grantor"), in favor of THE DOW CHEMICAL COMPANY, a Delaware corporation
("TDCC" or "Lender").

W I T N E S S E T H:

WHEREAS, Carbide is a party to a Credit Agreement dated as of the date first above written (as the same may be hereafter amended, modified, supplemented or
restated from time to time, the"Credit Agreement") between Carbide, as borrower, and TDCC, as lender;

WHEREAS,
as a condition precedent to the effectiveness of the Credit Agreement, Carbide is required to execute and deliver this Agreement; and

WHEREAS,
to secure the due and punctual payment and performance of, among other things, the obligations of Carbide arising under the Credit Agreement, Carbide wishes to grant to TDCC a
security interest in the Collateral (as defined below), subject to the limitations set forth herein;

NOW,
THEREFORE, in consideration of the premises and to induce TDCC to enter into the Credit Agreement and to induce TDCC to make and/or continue extensions of credit to Carbide
thereunder, Carbide hereby agrees with TDCC as follows:

ARTICLE I    DEFINED TERMS

Section 1.1Definitions.



"Agreement" means this Pledge and Security Agreement.

"Approved Deposit Account" means a Deposit Account maintained by Grantor with a Deposit Account Bank, which account is the subject of an
effective Deposit Account Control Agreement, and includes all monies on deposit therein and all certificates and instruments, if any, representing or evidencing such Deposit Account.

"Collateral" has the meaning specified inSection 2.1.

"Consolidated Net Tangible Assets" means total assets less (a) total current liabilities (excluding indebtedness for borrowed money
or guarantees thereof due within 12 months) and (b) goodwill, as

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reflected in the Company's most recent consolidated balance sheet preceding the relevant date of a determination, such amount to be calculated in accordance with Section 4.04(9) of the
Indenture.

"Debt Obligations" means (i) at any time when Grantor is bound by the restrictions set forth in Section 5.5 of the
Participation Agreement, any Obligation that would constitute "Debt" as defined in Section 5.1 of the Participation Agreement, and (ii) at any time when Grantor is not bound by the
restrictions set forth in Section 5.5 of the Participation Agreement, any Obligations for borrowed money or any guarantee of such Obligation.

"Deposit Account Bank" means a financial institution selected or approved by Lender and with respect to which Grantor has delivered to
Lender an executed Deposit Account Control Agreement.

"Deposit Account Control Agreement" means a letter agreement in form and substance satisfactory to Lender, executed by Grantor, Lender and
the relevant Deposit Account Bank.

"Designated Joint Ventures" means any of the Pledged Collateral identified as a "Designated Joint Venture" on Schedule 2.

"Indenture" means the Indenture dated as of June 1, 1995 between Grantor and Chemical Bank, as trustee, as amended.

"Intercompany Note" means any promissory note evidencing Intercompany Indebtedness.

"LLC" means each limited liability company in which Grantor has an interest identified on Schedule 2.

"LLC Agreement" means each operating agreement with respect to an LLC, as each agreement has heretofore been and may hereafter be amended,
restated, supplemented or otherwise modified from time to time.

"Non-Debt Obligations" means all Obligations other than Debt Obligations.

"Obligations" means all advances, debts, liabilities, obligations, covenants and duties owing by Grantor to Lender of every type and
description, arising under (i) the Credit Agreement or under any other Loan Document, including all Loans and Credit Enhancement Obligations and all fees and expenses and all interest, charges,
expenses, fees, attorneys' fees and disbursements and other sums chargeable to Grantor under the Credit Agreement or any other Loan Document, or (ii) any other transaction, arrangement,
agreement, guarantee, indemnity or extension or enhancement of credit entered into or provided by Lender to or on behalf of Grantor from and after the date hereof, in each case whether direct or
indirect, absolute or contingent, or due or to become due.

"Participation Agreement" means the Participation Agreement dated as of April 1, 2000, with respect to Union Carbide Trust
No. 2000-A, as amended from time to time.

"Partnership" means each partnership in which Grantor has an interest identified on Schedule 2.

"Partnership Agreement" means each partnership agreement governing a Partnership, as each such agreement has heretofore been and may
hereafter be amended, restated, supplemented or otherwise modified.

"Pledged Collateral" means, collectively, the Pledged Notes, the Pledged Stock, the Pledged Partnership Interests, the Pledged LLC
Interests, all certificates or other instruments representing any of the foregoing, all Security Entitlements of Grantor in respect of any of the foregoing, all dividends, interest distributions,
cash, warrants, rights, instruments and other property or Proceeds from time to time received, receivable or otherwise distributed in respect of or in exchange for any or all of the foregoing.

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"Pledged LLC Interests" means all of Grantor's right, title and interest as a member of the LLCs set forth on Schedule 2and all of Grantor's right, title and
interest in, to and under any LLC Agreement with respect thereto to which it is a party.

"Pledged Notes" means all right, title and interest of Grantor in the Instruments evidencing Intercompany Indebtedness (including any
Intercompany Notes) owed to Grantor, including all Indebtedness described onSchedule 2, issued by the obligors named therein, and all interest,
cash, Instruments and other property or Proceeds from time to time received, receivable or otherwise distributed in respect of or in exchange for any or all of such Indebtedness.

"Pledged Partnership Interests" means all of Grantor's right, title and interest as a limited and/or general partner in the Partnerships
set forth onSchedule 2and all of Grantor's right, title and interest in, to and under any Partnership Agreements with respect thereto to which
it is a party.

"Pledged Stock" means the shares of capital stock owned by Grantor identified on Schedule 2;provided, however,that
so long as doing otherwise would result in adverse tax
consequences to Grantor, the amount of outstanding capital stock of any Subsidiary that is not a domestic Subsidiary that is pledged or deemed to be pledged hereunder shall not exceed the amount of
shares of capital stock possessing up to but not exceeding 65% of the voting power of all classes of capital stock of such Subsidiary entitled to vote.

"Restricted Property" means any shares of capital stock of a Restricted Subsidiary owned by the Company or a Restricted Subsidiary.

"Restricted Subsidiary" means a Wholly-Owned Subsidiary that has substantially all of its assets located in the United States and owns a
manufacturing facility located in the United States.

"Secured Obligations" means the Debt Obligations and Non-Debt Obligations owed by Grantor to Lender.

"Securities Act" means the Securities Act of 1933, as amended.

"UCC" means the Uniform Commercial Code as in effect in the State of New York on the date hereof;provided,
however,that in the event that, by reason of mandatory provisions of law, any or all of the attachment, perfection or priority of Lender's security interest in any Collateral
is governed by the Uniform Commercial Code as in effect in a jurisdiction other than the State of New York, the term "UCC" shall mean the Uniform Commercial Code as in effect on the date hereof in
such other jurisdiction for purposes of the provisions hereof relating to such attachment, perfection or priority and for purposes of definitions related to such provisions.

"Wholly-Owned Subsidiary" means a Subsidiary of which 100% of the outstanding voting stock or equity securities are owned directly or
indirectly by Grantor.

Section 1.2Certain Other Terms.



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ARTICLE II    GRANT OF SECURITY INTEREST

Section 2.1Collateral.For the purposes of this Agreement, all of the following property now owned by
Grantor or in which Grantor now has any right, title or interests is collectively referred to as the "Collateral":



Notwithstanding
anything to the contrary contained above: (1) to the extent the security interest created by this Agreement is securing indebtedness for borrowed money or guarantees of
indebtedness for borrowed money (collectively "Funded Debt"), such security interest shall not extend to, and the term "Collateral" shall not include,
any Restricted Property (except to the extent the aggregate Funded Debt secured by Restricted Property hereunder does not exceed at any time outstanding 10% of Consolidated Net Tangible Assets);
(2) so long as Grantor is bound by Section 5.5 of the Participation Agreement, the maximum principal amount of Debt Obligations secured hereunder shall not exceed at any time outstanding
the sum of (x) $800,000,000plus(y) the amount of Debt Obligations to the extent secured by Designated Joint Ventures; (3) any
Pledged Collateral if the grant of a security interest therein would constitute a violation or breach of any other agreement by which Grantor is bound; and (4) any Deposit Accounts for which
the relevant depository bank's jurisdiction is not in the United States and acceptable arrangements cannot be made in the United States. The parties hereto agree that the amount of Debt Obligations
that may be secured under this Agreement is limited under clauses (1) and (2) above, as required under the Indenture and the Participation Agreement, to only a portion of the aggregate
Debt Obligations owing or which may become owing by Grantor to Lender and that any payments or repayments of such Debt Obligations shall be and be deemed to be applied first to the portion of such
Debt Obligations that is not secured hereby, it being the parties' intent that the portion of such Debt Obligations last remaining unpaid shall be secured hereby.

Section 2.2Grant of Security Interest in Collateral.Subject to the limitations expressly set forth in Section 2.1, Grantor, as
security for the full, prompt and complete payment and performance when due (whether at stated maturity, by acceleration
or otherwise) of the Secured Obligations, hereby collaterally pledges to Lender and grants to Lender a Lien on and security interest in, all of its right, title and interest in, to and under the
Collateral.

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ARTICLE III    REPRESENTATIONS AND WARRANTIES

To induce Lender to enter into the Credit Agreement, Grantor hereby represents and warrants to Lender that:

Section 3.1Title; No Other Liens.Except for the Lien granted to Lender pursuant to this Agreement and
the other Liens permitted to exist on the Collateral under the Credit Agreement, (a) Grantor is the record and beneficial owner of the Pledged Collateral pledged by it hereunder constituting
Instruments or certificated securities and owns each other item of Collateral in which a Lien is granted by it hereunder and (b) all such Collateral is owned free and clear of any and all
Liens.

Section 3.2Perfection and Priority.The security interest granted pursuant to this Agreement will
constitute a valid and continuing perfected security interest in favor of Lender in the Collateral for which perfection is governed by the UCC upon (i) the completion of the filings and other
actions specified onSchedule 3(which, in the case of all filings and other documents referred to on such schedule, have been delivered to
Lender in completed and duly executed form), (ii) the delivery to Lender of all Collateral consisting of Instruments and certificated securities, in each case properly endorsed for transfer to
Lender or in blank, and (iii) the execution of Deposit Account Control Agreements with respect to all Deposit Accounts. Such security interest will be prior to all other Liens on the Collateral
except for Customary Permitted Liens which have priority over Lender's Lien by operation of law or otherwise as permitted under the Credit Agreement or any Loan Document.

Section 3.3State of Incorporation; Chief Executive Office.On the date hereof Grantor's jurisdiction of
organization, organizational identification number, if any, and the location of Grantor's chief executive office or sole place of business is specified on Schedule 1.

Section 3.4Pledged Collateral.



ARTICLE IV    COVENANTS

As long as any of the Obligations (other than contingent indemnification Obligations not yet due and payable) remain outstanding, unless the Lender otherwise
consents in writing, Grantor agrees with Lender that:

Section 4.1Generally.Grantor shall (a) except for the security interest created by this
Agreement, not create or suffer to exist any Lien upon or with respect to any of the Collateral, except Liens permitted under the Credit Agreement; (b) not use or permit any Collateral to be
used

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unlawfully or in violation of any provision of this Agreement, any other Loan Document, any Requirement of Law or any policy of insurance covering the Collateral; (c) not sell, transfer or
assign (by operation of law or otherwise) any Collateral except as permitted under the Credit Agreement; (d) not enter into any agreement or undertaking restricting the right or ability of
Grantor or Lender to sell, assign or transfer any of the Collateral if such restriction would have a Material Adverse Effect; and (e) promptly notify Lender of its entry into any agreement or
assumption of undertaking that restricts the ability to sell, assign or transfer any of the Collateral regardless of whether or not it has a Material Adverse Effect.

Section 4.2Maintenance of Perfected Security Interest; Further Documentation.



Section 4.3Changes in Locations, Name, Etc.



Section 4.4Pledged Collateral.



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Section 4.5Approved Deposit Accounts.Except as otherwise permitted by the Credit Agreement, if required
by Lender under the Credit Agreement, Grantor will (i) deposit in an Approved Deposit Account all cash and all Proceeds received by Grantor, and (ii) not establish or maintain any
Deposit Account other than with a Deposit Account Bank.

Section 4.6Payment of Taxes and Other Obligations.Grantor will, to the extent required under the Credit
Agreement, pay and discharge or otherwise satisfy at or before maturity or before they become delinquent, as the case may be, all taxes, assessments and governmental charges or levies imposed upon the
Collateral or in respect of income or profits therefrom, as well as all claims of any kind (including claims for labor, materials and supplies) against or with respect to the Collateral, except that
no such charge need be paid if the amount or validity thereof is currently being contested in good faith by appropriate proceedings, reserves in conformity with GAAP with respect thereto have been
provided on
the books of Grantor and such proceedings could not reasonably be expected to result in the sale, forfeiture or loss of any material portion of the Collateral or any interest therein.

ARTICLE V    REMEDIAL PROVISIONS

Section 5.1Code and Other Remedies.During the continuance of an Event of Default, Lender may exercise,
in addition to all other rights and remedies granted to it in this Agreement and in any other instrument or agreement securing, evidencing or relating to the Secured Obligations, all rights

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and remedies of a secured party under the UCC or any other applicable law. Without limiting the generality of the foregoing, Lender, without demand of performance or other demand, presentment,
protest, advertisement or notice of any kind (in each case except any required by law referred to below) to or upon Grantor or any other Person (all and each of which demands, defenses, advertisements
and notices are hereby waived), may in such circumstances forthwith collect, receive, appropriate and realize upon the Collateral, or any part thereof, and/or may forthwith sell, lease, assign, give
option or options to purchase, or otherwise dispose of and deliver the Collateral or any part thereof (or contract to do any of the foregoing), in one or more parcels at public or private sale or
sales, at any exchange, broker's board or office of Lender or elsewhere upon such terms and conditions as it may deem advisable and at such prices as it may deem best, for cash or on credit or for
future delivery without assumption of any credit risk. Lender shall have the right upon any such public sale or sales, and, to the extent permitted by law, to purchase the whole or any part of the
Collateral so sold, free of any right or equity of redemption in Grantor, which right or equity is hereby waived and released. Lender shall apply the net proceeds of any action taken by it pursuant to
thisSection 5.1, after deducting all reasonable costs and expenses of every kind incurred in connection therewith or incidental to the care or
safekeeping of any of the Collateral or in any way relating to the Collateral or the rights of Lender hereunder, including reasonable attorneys' fees and disbursements, to the payment in whole or in
part of the Secured Obligations, in such order as the Credit Agreement shall proscribe, and only after such application and after the payment by Lender of any other amount required by any provision of
law, need Lender account for the surplus, if any, to Grantor. To the extent permitted by applicable law, Grantor waives all claims, damages and demands it may acquire against Lender arising out of the
exercise by it of any rights hereunder. If any notice of a proposed sale or other disposition of Collateral shall be required by law, such notice shall be deemed reasonable and proper if given at
least 10 days before such sale or other disposition.

Section 5.2Pledged Collateral.



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Section 5.3Sale of Pledged Collateral.



Section 5.4Deficiency.Grantor shall remain liable for any deficiency if the proceeds of any sale or
other disposition of the Collateral are insufficient to pay the Secured Obligations and the fees and disbursements of any attorneys employed by Lender to collect such deficiency.

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ARTICLE VI    POWER OF ATTORNEY

Section 6.1Lender's Appointment as Attorney-in-Fact.



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Section 6.2Duty of Lender.Lender's sole duty with respect to the custody, safekeeping and physical
preservation of the Collateral in its possession shall be to deal with it in the same manner as Lender deals with similar property for its own account. Subject to applicable law, neither Lender nor
any of its officers, directors, employees or agents shall be liable for failure to demand, collect or realize upon any of the Collateral or for any delay in doing so or shall be under any obligation
to sell or otherwise dispose of any Collateral upon the request of Grantor or any other Person or to take any other action whatsoever with regard to the Collateral or any part thereof. The powers
conferred on Lender hereunder are solely to protect Lender's interest in the Collateral and shall not impose any duty upon Lender to exercise any such powers. Lender shall be accountable only for
amounts that Lender actually receives as a result of the exercise of such powers, and neither Lender nor any of its officers, directors, employees or agents shall be responsible to Grantor for any act
or failure to act hereunder.

Section 6.3Execution of Financing Statements.Grantor authorizes Lender to file or record financing
statements and other filing or recording documents or instruments with respect to the Collateral in such form and in such offices as Lender reasonably determines appropriate to perfect the security
interests of Lender under this Agreement. A photographic or other reproduction of this Agreement shall be sufficient as a financing statement or other filing or recording document or instrument for
filing or recording in any jurisdiction.

ARTICLE VII    MISCELLANEOUS

Section 7.1Amendments in Writing.None of the terms or provisions of this Agreement may be waived,
amended, supplemented or otherwise modified except in accordance with Section 10.1 of the Credit Agreement.

Section 7.2Notices.All notices, requests and demands to or upon Lender or Grantor hereunder shall be
effected in the manner provided for in Section 10.6 of the Credit Agreement.

Section 7.3No Waiver by Course of Conduct; Cumulative Remedies.Lender shall not by any act (except by a
written instrument pursuant to Section 7.1), delay, indulgence, omission or otherwise be deemed to have waived any right or remedy hereunder or to have acquiesced in any Default or Event of
Default. No failure to exercise, nor any delay in exercising, on the part of Lender any right, power or privilege hereunder shall operate as a waiver thereof. No single or partial exercise of any
right, power or privilege hereunder shall preclude any other or further exercise thereof or the exercise of any other right, power or privilege. A waiver by Lender of any right or remedy hereunder on
any one occasion shall not be construed as a bar to any right or remedy which Lender would otherwise have on any future occasion. The rights and remedies herein provided are cumulative, may be
exercised singly or concurrently and are not exclusive of any other rights or remedies provided by law.

Section 7.4Successors and Assigns.This Agreement shall be binding upon the successors and assigns of
Grantor and shall inure to the benefit of Lender and its successors and assigns; provided, however, that Grantor may not assign, transfer or delegate any of its rights or obligations under this
Agreement without the prior written consent of Lender.

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Section 7.5Counterparts.This Agreement may be executed by one or more of the parties to this Agreement
on any number of separate counterparts (including by telecopy), and all of said counterparts taken together shall be deemed to constitute one and the same agreement.

Section 7.6Severability.Any provision of this 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.

Section 7.7Section Headings.The Article and Section titles contained in this Agreement are and shall be
without substantive meaning or content of any kind whatsoever and are not part of the agreement of the parties hereto.

Section 7.8Entire Agreement.This Agreement together with the other Loan Documents represents the entire
agreement of the parties and supersedes all prior agreements and understandings relating to the subject matter hereof.

Section 7.9Governing Law.This agreement and the rights and obligations of the
parties hereto shall be governed by, and construed and interpreted in accordance with, the law of the state of New York.

Section 7.10Release of Collateral; Termination.



Section 7.11Reinstatement.Grantor further agrees that, if any payment made by Grantor or any other
Person and applied to the Obligations is at any time annulled, avoided, set aside, rescinded, invalidated, declared to be fraudulent or preferential or otherwise required to be refunded or repaid, or
the proceeds of Collateral are required to be returned by Lender to such person, its estate, trustee, receiver or any other party, including Grantor, under any bankruptcy law, state or federal law,
common law or equitable cause, then, to the extent of such payment or repayment, any Lien or other Collateral securing such liability shall be and remain in full force and effect, as fully as if such
payment had never been made or, if prior thereto the Lien granted hereby or other Collateral securing such liability hereunder shall have been released or terminated), such Lien or other Collateral
shall be reinstated in full force and effect, and such prior release or termination shall not diminish, release, discharge, impair or otherwise affect any Lien or other Collateral securing the
obligations of Grantor in respect of the amount of such payment.

[SIGNATURE
PAGES FOLLOW]

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IN WITNESS WHEREOF, each of the undersigned has caused this Pledge and Security Agreement to be duly executed and delivered as of the date first above written.

|                                              |  |              |  | UNION CARBIDE CORPORATION
|--------------------------------------------- |  | ------------ |  | -------------------------
|                                              |  |              |  | By:                      
|                                              |  |              |  |                          
|ACCEPTED AND AGREED:
THE DOW CHEMICAL COMPANY |  |              | 
|By:                                           |  |              |  |                          
|                                              |  | Name:
Title: |  |                          

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EXECUTION COPY

EXHIBIT B    FORM OF NOTE

|$ |  | As of ,
200
|- |  | -----------

FOR
VALUE RECEIVED, the undersigned, UNION CARBIDE CORPORATION, a New York corporation ("Borrower"), promises to pay to THE DOW CHEMICAL
COMPANY, a Delaware corporation (hereinafter, "Lender"), at the office of Lender in Midland, Michigan or such other place as Lender may designate in
writing to Borrower, the principal sum of
 AND    /100s DOLLARS ($) in United
States
funds, or, if less, so much thereof as may from time to time be outstanding, plus interest as hereinafter provided.

Capitalized
terms used but not defined herein shall have the meanings specified in the Revolving Credit Agreement dated as of March 25, 2003, and entered into by and between
Borrower and Lender (as the same may be amended, modified, supplemented or restated from time to time, the "Credit Agreement").

All
principal amounts and other amounts then outstanding hereunder shall be due and payable on the Termination Date.

Borrower
shall also repay principal outstanding hereunder from time to time as provided by Section 2.8 of the Credit Agreement.

Borrower
shall be entitled to borrow and re-pay Loans evidenced hereunder pursuant to the terms and conditions of the Credit Agreement. Prepayment of the principal amount of
any Loans may be made only as provided in the Credit Agreement.

Borrower
hereby promises to pay interest on the unpaid principal amount hereof as provided in Section 2.9 of the Credit Agreement. Overdue principal and overdue interest shall
bear interest payable on DEMAND at the default rate as provided in the Credit Agreement.

In
no event shall the amount of interest due or payable hereunder exceed the maximum rate of interest allowed by Requirements of Law, and in the event any such payment is inadvertently
made by Borrower or inadvertently received by Lender, then such excess sum shall be credited as a payment of principal, unless Borrower shall notify Lender in writing that it elects to have such
excess sum returned forthwith. It is the express intent hereof that Borrower not pay and Lender not receive, directly or indirectly in any manner whatsoever, interest in excess of that which may
legally be paid by Borrower under Requirements of Law.

All
parties now or hereafter liable with respect to this Note, whether Borrower, any guarantor, endorser, or any other Person or entity, hereby waive presentment for payment, demand,
notice of non-payment or dishonor, protest and notice of protest.

No
delay or omission on the part of Lender or any holder hereof in exercising its rights under this Note, or delay or omission on the part of Lender in exercising its rights under the
Credit Agreement or under any other Loan Document, or course of conduct relating thereto, shall operate as a waiver of such rights or any other right of Lender or any holder hereof, nor shall any
waiver by Lender or any holder hereof of any such right or rights on any one occasion be deemed a bar to, or waiver of, the same right or rights on any future occasion.

Borrower
promises to pay all reasonable costs of collection, including reasonable attorneys' fees, should this Note be collected by or through an attorney-at-law
or under advice therefrom.

Time
is of the essence of this Note.

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This
Note evidences Loans under, and is entitled to the benefits and subject to the terms of, the Credit Agreement, which contains provisions with respect to the acceleration of the
maturity of this Note upon the happening of certain stated events, and provisions for prepayment. This Note is secured by and is also entitled to the benefits of the Collateral Documents and any other
agreement or instrument providing collateral for the Loans, whether now or hereafter in existence, and any filings, instruments, agreements, and documents related thereto and providing collateral for
the Loans.

To
the extent there are inconsistencies between this Note and the Credit Agreement, the Credit Agreement shall govern.

THIS
NOTE SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK.

EACH
OF THE LENDER AND THE BORROWER IRREVOCABLY WAIVES TRIAL BY JURY IN ANY ACTION OR PROCEEDING WITH RESPECT TO THIS AGREEMENT OR THE REVOLVING LOAN AGREEMENT.

[REMAINDER
OF PAGE INTENTIONALLY LEFT BLANK]

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IN
WITNESS WHEREOF, a duly authorized officer of Borrower has executed this Note as of the day and year first above written.

|BORROWER: |  | UNION CARBIDE CORPORATION
|--------- |  | -------------------------
|          |  | By:                      
|          |  |                          
|          |  |                          

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EXECUTION COPY

EXHIBIT C    FORM OF SUBSIDIARY GUARANTEE

This SUBSIDIARY GUARANTEE (as amended, modified or supplemented from time to time as provided herein, this "Subsidiary
Guarantee") is dated as of March 25, 2003, and made by each of UNION CARBIDE SUBSIDIARY C, INC., a Delaware corporation, UNION CARBIDE CHEMICALS & PLASTICS
TECHNOLOGY CORPORATION, a Delaware corporation, UCMG LLC, a Delaware limited liability company, and CATALYSTS, ADSORBENTS & PROCESS SYSTEMS, INC., a Maryland corporation (collectively,
the "Guarantors" and individually as a "Guarantor"), for the benefit of THE DOW CHEMICAL COMPANY, a
Delaware corporation ("Lender").

WHEREAS,
Union Carbide Corporation, a New York corporation ("Borrower") and Lender are parties to that certain Revolving Credit Agreement
dated as of the date hereof (as such agreement may be amended, modified or supplemented from time to time, the "Credit Agreement");

WHEREAS,
pursuant to the terms of the Credit Agreement, Lender has agreed to make Loans and Credit Enhancements (as defined in the Credit Agreement) available to Borrower;

WHEREAS,
as a subsidiary of Borrower, each of the Guarantors will derive substantial direct and indirect benefits from such Loans and Credit Enhancements;

WHEREAS,
it is a condition precedent to the effectiveness of the Credit Agreement that each of the Guarantors shall have executed and delivered this Subsidiary Guarantee to Lender;

WHEREAS,
each Guarantor's obligations hereunder shall be joint and several with the obligations of each other Guarantor hereunder;

WHEREAS,
capitalized terms used but not otherwise defined herein shall have the meaning set forth in the Credit Agreement;

NOW
THEREFORE, in consideration of the premises and the mutual agreements contained herein and for other good and valuable consideration the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

Section 1.    Guarantee.Each Guarantor unconditionally guarantees, as a primary obligor and not merely as a
surety in accordance with the terms of the Loan Documents: (a) the due and punctual payment (after all applicable notices have been given and all applicable cure periods have expired) of
(i) the principal amount of and interest (including interest accruing during the pendency of any proceeding under any law relating to bankruptcy, insolvency or reorganization or relief of
debtors (each a "Debtor Relief Law"), regardless of whether allowed or allowable in such proceeding under any Debtor Relief Law) on all Loans, when and
as due, whether at maturity, by acceleration, upon one or more dates set for prepayment or otherwise, (ii) all Reimbursement Obligations when and as due, whether at maturity, by acceleration,
upon one or more dates set for prepayment or otherwise, and (iii) all other monetary Obligations, including indemnities and fees, costs and expenses, whether primary, secondary, direct,
contingent, fixed or otherwise (including monetary Obligations incurred during the pendency of any proceeding under any Debtor Relief Law, regardless of whether allowed or allowable in such
proceeding), of Borrower (collectively with the Guarantors, the "Obligors") to Lender under the Credit Agreement and the other Loan Documents; and
(b) the due and punctual performance (after all applicable notices have been given and all applicable cure periods have expired) of all covenants, agreements, Obligations and liabilities of the
Obligors (other than such Guarantor) under or pursuant to the Credit Agreement and the other Loan Documents (all the monetary and

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other Obligations referred to in the preceding clauses (a) and (b) being collectively called the "Guaranteed Obligations"); provided however,that (i) the liability of each Guarantor hereunder shall be limited to the maximum amount of the Guaranteed Obligations which
such Guarantor may guaranty without violating any fraudulent conveyance or fraudulent transfer law (plusall reasonable costs and expenses paid or
incurred by Lender in enforcing this Guarantee against such Guarantor) and (ii) the aggregate amount recoverable under this Guarantee from all Guarantors shall not exceed the amount of the
Guaranteed Obligations. Each Guarantor further agrees that the Guaranteed Obligations may be extended or renewed, in whole or in part, without notice to or further assent from it, and that it will
remain bound upon its guarantee notwithstanding any extension or renewal of any Guaranteed Obligation.

Section 2.    No Waiver; Discharge or Diminishment of Guarantee.To the fullest extent permitted by
applicable law, each Guarantor waives presentment to, demand of payment from and protest to Borrower of any of the Guaranteed Obligations, and also waives notice of acceptance of its guarantee and
notice of protest for nonpayment. To the fullest extent permitted by applicable law, the Guaranteed
Obligations of each Guarantor hereunder shall not be subject to any reduction, limitation, impairment or termination for any reason (other than the indefeasible payment in full in cash of the
Guaranteed Obligations), including any claim of waiver, release, surrender, alteration or compromise of any of the Guaranteed Obligations, and shall not be subject to any defense or right of
set-off, counterclaim, recoupment or termination whatsoever by reason of the invalidity, illegality or unenforceability of the Guaranteed Obligations or otherwise.

Section 3.    Guarantee of Payment.Each Guarantor further agrees that its guarantee constitutes a guarantee
of payment when due and not of collection, and waives any right to require that any resort be had by Lender to any security held for payment of the Guaranteed Obligations or to any funds held by
Lender in favor of Borrower or any other Person.

Section 4.    Defenses of Borrower Waived.To the fullest extent permitted by applicable law, each Guarantor
waives any defense based on or arising out of any defense of Borrower or any other Obligor or the unenforceability of the Guaranteed Obligations or any part thereof from any cause, or the cessation
from any cause of the liability of Borrower or any other Obligor, other than the final and indefeasible payment in full in cash of the Guaranteed Obligations. Lender may, at its election, foreclose on
any security, if any, held by it by one or more judicial or nonjudicial sales, accept an assignment of any such security in lieu of foreclosure, compromise or adjust any part of the Guaranteed
Obligations, make any other accommodation with Borrower or any other Obligor or exercise any other right or remedy available to them against Borrower or any other Obligor, without affecting or
impairing in any way the liability of any Guarantor hereunder except to the extent the Guaranteed Obligations have been fully, finally and indefeasibly paid in cash. To the fullest extent permitted by
applicable law, each Guarantor waives any defense arising out of any such election even though such election operates, pursuant to applicable law, to impair or to extinguish any right of reimbursement
or subrogation or other right or remedy of such Guarantor against Borrower or any other Obligor or any security.

Section 5.    Agreement to Pay; Subrogation.In furtherance of the foregoing and not in limitation of any
other right that Lender may have at law or in equity against the Guarantors by virtue hereof, upon the failure of Borrower to pay any Guaranteed Obligation when and as the same shall become due,
whether at maturity, by acceleration, after notice of prepayment or otherwise, each Guarantor hereby promises to and will forthwith pay, or cause to be paid, to such Person as Lender shall designate
in cash the amount of such unpaid Guaranteed Obligations. Upon payment by the Guarantors of any sums to Lender as provided above, all rights of such Guarantors against Borrower arising as a result
thereof by way of right of subrogation, contribution, reimbursement, indemnity or otherwise shall in all respects be subordinate and junior in right of payment to the prior indefeasible payment in
full in cash of all of the Guaranteed Obligations, provided that each Guarantor shall be

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entitled to enforce or to receive any payment arising out of or based upon such right of subrogation upon the indefeasible payment in full of all the Guaranteed Obligations. In addition, any
indebtedness of Borrower or any other Obligor now or hereafter held by any of the Guarantors is hereby subordinated in right of payment to the prior payment in full of the Guaranteed Obligations. If
any amount shall erroneously be paid to any of the Guarantors on account of (i) such subrogation, contribution, reimbursement, indemnity or similar right or (ii) any such indebtedness of
Borrower, such amount shall be held in trust for the benefit of Lender and shall forthwith be turned over to such Person as Lender shall designate in the exact form received by such Guarantor to be
credited against
the payment of the Guaranteed Obligations, whether matured or unmatured, in accordance with the terms of the Loan Documents.

Section 6.    Information.Each Guarantor assumes all responsibility for being and keeping itself informed
of Borrower's and each other Obligor's financial condition and assets, and of all other circumstances bearing upon the risk of nonpayment of the Guaranteed Obligations and the nature, scope and extent
of the risks that such Guarantor assumes and incurs hereunder, and agrees that Lender will not have any duty to advise such Guarantor of information known to it or any of them regarding such
circumstances or risks.

Section 7.    Negative Covenants.



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Section 8.    Representations and Warranties.Each Guarantor represents and warrants as to itself to Lender
that: (i) this Subsidiary Guarantee has been duly authorized, executed and delivered by it, and (ii) this Subsidiary Guarantee constitutes its legal, valid and binding obligation,
enforceable against it in accordance with its terms, except as enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer or conveyance or similar laws
relating to or limiting creditors' rights generally or by equitable principles relating to enforceability.

Section 9.    Termination.The Guarantee made hereunder (i) shall terminate when all the Guaranteed
Obligations have been paid in full and (ii) shall continue to be effective or be reinstated, as the case may be, if at any time payment, or any part thereof, of any Guaranteed Obligation is
rescinded or must otherwise be restored by Lender or any Obligor upon the bankruptcy or reorganization of Borrower, any Obligor or otherwise.

Section 10.    Amendment, Waivers, Etc.No amendment, waiver or consent shall, unless in writing and signed
by the party or parties against whom enforcement of any amendment or waiver of any affected provision herein is sought, affect the rights or obligation of such party or parties under this Subsidiary
Guarantee or the other Loan Documents.

Section 11.    Indemnities.



Section 12.    Limitation of Liability.Each Guarantor agrees that no Indemnitee shall have any liability
(whether direct or indirect, in contract, tort or otherwise) to the Guarantor or any of its

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Subsidiaries or any of their present or future equity holders or creditors for or in connection with the transactions contemplated hereby and in the other Loan Documents.

Section 13.    Right of Set-off.Each Guarantor agrees that Lender is hereby authorized at any
time and from time to time, to the fullest extent permitted by law, to set off and apply any and all funds at any time held and other indebtedness or other amounts at any time owing by Lender or its
Affiliates to or for the credit or the account of such Guarantor against any and all of the Guaranteed Obligations now or hereafter existing whether or not Lender shall have made any demand under this
Subsidiary Guarantee or any other Loan Document and although such Guaranteed Obligations may be unmatured. Lender agrees promptly to notify the applicable Guarantor after any such set-off
and application is made by Lender;provided, however,that the failure to give such notice shall not affect the validity of such set-off and
application. The rights of Lender under this Section 13 are in addition to the other rights and remedies (including other rights of set-off) which Lender may have. In the event any
amount is set-off against any unmatured Guaranteed Obligation, the amount set-off against such unmatured Guaranteed Obligation shall be used to cash collateralize such Credit
Enhancement in accordance with Section 9.3 of the Credit Agreement.

Section 14.    Notices, Etc.All notices, demands, requests and other communications provided for in this
Subsidiary Guarantee shall be given in writing and addressed to the party to be notified as follows:



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or
at such other address as shall be notified in writing to the Guarantors and Lender. All such notices and communications shall be effective upon personal delivery (if delivered by hand, including
any overnight courier service), or when deposited in the mails (if sent by mail).

Section 15.    No Waiver; Remedies.No failure on the part of Lender to exercise, and no delay in
exercising, any right hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any such right preclude any other or further exercise thereof or the exercise of any
other right. The remedies herein provided are cumulative and not exclusive of any remedies provided by law.

Section 16.    Binding Effect.This Subsidiary Guarantee shall become effective on the Effective Date and
thereafter this Subsidiary Guarantee shall be binding upon and inure to the benefit of each Guarantor and Lender and their respective successors and assigns, except that no Guarantor shall have the
right to assign its rights hereunder or any interest herein without the prior written consent of Lender.

Section 17.    Governing Law.This Subsidiary Guarantee and the rights and
obligations of the parties hereto shall be governed by, and construed and interpreted in accordance with, the law of the State of New York.

Section 18.    Submission to Jurisdiction.Any legal action or proceeding with respect to this Subsidiary
Guarantee may be brought in the courts of the State of New York or of the United States of America for the Southern District of New York, and, by execution and delivery of this Subsidiary Guarantee,
each Guarantor hereby accepts for itself and in respect of its property, generally and unconditionally,
the jurisdiction of the aforesaid courts. The parties hereto hereby irrevocably waive any objection to the extent permitted by law, including any objection to the laying of venue or based on the
grounds of forum non conveniens, which any of them may now or hereafter have to the bringing of any such action or proceeding in such respective jurisdictions.

Section 19.    Waiver of Jury Trial.EACH OF THE GUARANTORS IRREVOCABLY WAIVE TRIAL BY JURY IN ANY ACTION OR
PROCEEDING WITH RESPECT TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT.

Section 20.    Marshaling; Payments Set Aside.Lender shall not be under any obligation to marshal any
assets in favor of any Guarantor or any other party. To the extent that any Guarantor makes a payment or payments to Lender in respect of Guaranteed Obligations or Lender receives payment from the
proceeds of the Collateral or exercises its rights of set-off, and such payment or payments or the proceeds of such enforcement or setoff or any part thereof are subsequently invalidated,
declared to be fraudulent or preferential, set aside or required to be repaid to a trustee, receiver or any other party, then to the extent of such recovery, the obligation or part thereof originally
intended to be satisfied, and all Liens, right and remedies therefor, shall be revived and continued in full force and effect as if such payment had not been made or such enforcement or setoff had not
occurred.

Section 21.    Section Titles.The Section titles contained in this Subsidiary Guarantee are and shall be
without substantive meaning or content of any kind whatsoever and are not a part of the agreement between the parties hereto.

Section 22.    Execution in Counterparts.This Subsidiary Guarantee may be executed in any number of
counterparts and by different parties in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall 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 attached to the same document.

Section 23.    Entire Agreement.This Subsidiary Guarantee, together with all of the other Loan Documents
and all certificates and documents delivered hereunder or thereunder, embodies the entire

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agreement of the parties and supersedes all prior agreements and understandings relating to the subject matter hereof.

Section 24.    Reinstatement.This Subsidiary Guarantee shall remain in full force and effect and continue
to be effective, subject to applicable law, should any petition be filed by or against any Obligor for liquidation or reorganization, should any Obligor become insolvent or make an assignment for the
benefit of creditors or should a receiver or trustee be appointed for all or any significant part of any Obligor's assets, and shall, to the fullest extent permitted by law, continue to be effective
or be
reinstated, as the case may be, if at any time payment and performance of the Guaranteed Obligations, or any part thereof, is, pursuant to applicable law, rescinded or reduced in amount, or must
otherwise be restored or returned by any obligee of the Guaranteed Obligations or such part thereof, whether as a "voidable preference," "fraudulent transfer," all as though such payment or
performance had not been made. In the event that any payment, or any part thereof, is rescinded, reduced, restored or returned, the Guaranteed Obligations shall, to the fullest extent permitted by
law, be reinstated and deemed reduced only by such amount paid and not so rescinded, reduced, restored or returned.

*
* * *

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IN WITNESS WHEREOF, the undersigned has duly executed this Subsidiary Guarantee as of the day and year first above written.

| |  | UNION CARBIDE SUBSIDIARY C, INC.                         
| |  | ---------------------------------------------------------
| |  | By:                                                      
| |  |                                                          
| |  | Name:
Title:                                             
| |  | UNION CARBIDE CHEMICALS & PLASTICS TECHNOLOGY CORPORATION
| |  | By:                                                      
| |  |                                                          
| |  | Name:
Title:                                             
| |  | UCMG LLC                                                 
| |  | By:                                                      
| |  |                                                          
| |  | Name:
Title:                                             
| |  | CATALYSTS ADSORBENTS & PROCESS SYSTEMS, INC.             
| |  | By:                                                      
| |  |                                                          
| |  | Name:
Title:                                             

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EXECUTION COPY

EXHIBIT D    FORM OF PROMISSORY NOTE

|$65,540,194.46 |  | As of March 24, 2003
|-------------- |  | --------------------

FOR
VALUE RECEIVED, the undersigned, UNION CARBIDE CORPORATION, a New York corporation (the "Borrower"), promises to pay to THE DOW
CHEMICAL COMPANY, a Delaware corporation (hereinafter, "Lender"), at the office of Lender in Midland, Michigan or such other place as Lender may
designate in writing to Borrower, the principal sum of SIXTY-FIVE MILLION FIVE HUNDRED FORTY THOUSAND ONE HUNDRED NINETY-FOUR DOLLARS AND 46/100s DOLLARS ($65,540,194.46) in
United States funds, or, if less, so much thereof as may from time to time be outstanding, plus interest as hereinafter provided.

Borrower
is issuing this Note to Lender as a condition precedent to the effectiveness of that certain Revolving Credit Agreement to be entered into as of March 25, 2003, by and
between Borrower and Lender (as the same may be amended, modified, supplemented or restated from time to time, the
"New Credit Agreement"). Capitalized terms used but not defined herein shall have the meanings specified in the New Credit Agreement.

The
principal amount of this Note constitutes the aggregate principal amount of loans, and unpaid interest thereon, owing by Borrower to Lender as of the date hereof under the Revolving
Loan Agreement between Borrower and Lender, dated as of February 6, 2001, as amended on July 1, 2002 (the "Existing Credit Agreement").
Upon the execution of this Note by Borrower and Lender, the Existing Credit Agreement shall be automatically terminated and be of no further force and effect, and accordingly Lender's obligations to
advance loans to Borrower thereunder shall immediately cease;provided, however,that such termination will not affect Borrower's obligations to repay
any amount owing under this Note or any of Borrower's obligations under Section 7.5 of the Existing Credit Agreement.

All
principal amounts and other amounts then outstanding hereunder shall be due and payable on the earliest to occur of (x) March 25, 2004, (y) such other date on
which all obligations under the New Credit Agreement shall have become, or have been declared, due and payable, other than as a result of Section 2.3(b) of the New Credit Agreement, and
(z) the occurrence of an Event of Default set forth in Section 4 below (such earliest date, the "Maturity Date").



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During
the continuance of any Event of Default of the type described in clause (a) or (b), this Note, all interest thereon and all other amounts and Obligations payable under
Section 7.5 of the Existing Credit Agreement shall automatically be due and payable without action of the Lender, without presentment, demand, protest or notice of any kind, all of which are
hereby expressly waived by Borrower



[REMAINDER
OF PAGE INTENTIONALLY LEFT BLANK]

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IN
WITNESS WHEREOF, a duly authorized officer of Borrower has executed this Note as of the day and year first above written.

|BORROWER:                                                       |  | UNION CARBIDE CORPORATION
|--------------------------------------------------------------- |  | -------------------------
|                                                                |  |                          
|                                                                |  |                          
|                                                                |  |                          
|Acknowledged and agreed as of the date first above written, by: |  |                          
|THE DOW CHEMICAL COMPANY                                        |  |                          
|By:                                                             |  |                          
|                                                                |  |                          
|Name:
Title:                                                    |  |                          

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