THE STERLING GROUP

                                                THE STERLING GROUP, INC.
                                                EIGHT GREENWAY PLAZA, SUITE 702
                                                HOUSTON, TEXAS 77046
                                                713-877-8257
                                                FAX 713-877-1824


                                   May 6, 1996


Texas Petrochemical Holdings, Inc.
TPC Holding Corp.
8 Greenway Plaza, Suite 702
Houston, Texas 77046

Ladies and Gentlemen:

This letter agreement will confirm the agreement between Texas Petrochemical
Holdings, Inc. ("Holdings") and TPC Holding Corp. ("TPCHC"), on behalf of
themselves and their respective present and future direct and indirect
wholly-owned subsidiaries (collectively, the "Companies" and individually, a
"Company"), and The Sterling Group, Inc. ("Sterling") in connection with TPCHC's
acquisition of the common stock of Texas Olefins Company and its subsidiary
Texas Petrochemicals Corporation (the "Acquisition"), as follows:

1.   SERVICES. Sterling has provided or will provide consulting services prior
     to the closing to Holdings, TPCHC and the Companies in connection with the
     organization of Holdings, TPCHC and the Companies, structuring the
     Acquisition and the financing thereof, arrangements for outside consulting
     services in connection with the Acquisition, advice with respect to
     employee benefit and compensation arrangements and other reasonable
     assistance prior to the closing of the Acquisition when and as requested by
     Holdings, TPCHC or any of the Companies.

2.   FEE AND EXPENSES. For its services in connection with the Acquisition,
     Sterling will be entitled to receive from the TPCHC at the consummation of
     the Acquisition a fee in the amount of $4,000,000 and reimbursement of all
     expenses paid or incurred by Sterling in connection therewith.

3.   INDEMNIFICATION. Holdings and TPCHC, on behalf of themselves and each of
     the Companies, jointly and severally, agree to indemnify and hold harmless
     Sterling, its consultants, each of their respective controlling persons and
     each director, officer, employee, principal, consultant, affiliate and
     agent thereof (each an "Indemnified Person") from and against any and all
     losses, claims, damages and liabilities, joint or several, to which any
     Indemnified Person may become subject relating to or arising out of, or in
     connection with, any advice or services provided under this Agreement or
     the transactions contemplated by this Agreement, the Acquisition
     (including, without limitation, the use of proceeds from the sale of
     securities and the financing of the Acquisition) or any related transaction
     (including without limitation, any engagement letters entered into by
     Sterling with CS First Boston Corporation, Merrill Lynch & Co., or any
     other investment banking firm with respect to the financing of the
     Acquisition, and that certain letter agreement between Sterling and Texas
     Commerce Bank National Association dated April 30, 1996 and the
     transactions contemplated thereby), and to reimburse each Indemnified
     Person, promptly upon demand, for expenses (including reasonable counsel
     fees and expenses) as they are incurred in connection with the
     investigation of, giving testimony or furnishing documents for, preparation
     for or defense of any pending or threatened loss, claim, damage or
     liability, or any litigation, proceeding or other action in respect thereof
     (collectively, "Actions"), including any amount paid in settlement of any
     litigation, proceeding or other action (commenced or threatened), to which
     Holdings shall have consented in writing (such consent not to be
     unreasonably withheld), whether or not any Indemnified Person is a party
     and whether or not liability resulted therefrom; provided, however, that
     the indemnity contained in this Agreement will not apply to any Indemnified
     Person with respect to losses, claims, damages, liabilities or related
     expenses that are found in a final judgment by a court of competent
     jurisdiction (not subject to further appeal) to have resulted from the
     willful misconduct or gross negligence of such Indemnified Person. In
     addition, neither Holdings, TPCHC nor any of the Companies will, without
     prior written consent of Sterling, settle, compromise or consent to the
     entry of any judgment in or otherwise seek to terminate any pending or
     threatened Action in respect of which indemnification or contribution may
     be sought hereunder (whether or not any Indemnified Person is a party
     thereto) unless such settlement, compromise, consent or termination
     includes an unconditional release of each Indemnified Person from all
     liabilities arising out of such Action.

     Promptly after receipt by an Indemnified Person of written notice with
     respect to the commencement of any investigation, claim or other Action
     with respect to which such Indemnified Person may seek indemnification
     hereunder, such Indemnified Person shall notify Holdings in writing at the
     address set forth on the first page hereof of such Action; but the omission
     so to notify Holdings shall not relieve Holdings, TPCHC or any of the
     Companies from any liability that Holdings, TPCHC or any of the Companies
     may have hereunder to such Indemnified Person. The Indemnified Persons
     shall be entitled to retain separate counsel of their own choice; provided
     that Holdings, TPCHC or any of the Companies shall not be responsible for
     the fees and expenses of more than one firm of attorneys (and local
     counsel, if appropriate) for all of the Indemnified Persons in any single
     Action, unless the Indemnified Persons shall have been advised that there
     may be one or more legal defenses available to any of them that may be
     different from or additional to those available to the others, in which
     event each such Indemnified Person shall be entitled to separate counsel at
     the expense of Holdings, TPCHC and the Companies.

     If indemnification is found in a final judgment by a court of competent
     jurisdiction (not subject to further appeal) for reason of public policy or
     any other reason not to

   be available, Holdings and TPCHC, on behalf of themselves and each of the
   Companies, and the Indemnified Person shall contribute to the losses, claims,
   damages, liabilities or expenses (or Actions in respect thereof) for which
   such indemnification is held unavailable in such proportion as is appropriate
   to reflect the relative benefits to and fault of Holdings, TPCHC or any of
   the Companies, on the one hand, and the Indemnified Person, on the other
   hand, in connection with the matter giving rise to such losses, claims,
   damages, liabilities or expenses (or Actions in respect thereof).
   Notwithstanding the foregoing, Sterling shall not be obligated to contribute
   any amount hereunder that exceeds the fees and expenses received by Sterling
   hereunder. No person found liable for a fraudulent misrepresentation (within
   the meaning of Section 11 (f) of the Securities Act of 1933, as amended)
   shall be entitled to contribution from any person who is not found liable for
   such fraudulent misrepresentation.

   Holdings and TPCHC, on behalf of themselves and each of the Companies, also
   agree, jointly and severally, that no Indemnified Person shall have any
   liability (whether direct or indirect, in contract or tort or otherwise) to
   Holdings, TPCHC or any of the Companies for or in connection with advice or
   services rendered or to be rendered by any Indemnified Person pursuant to
   this Agreement, the Acquisition, the financing thereof, the transactions
   contemplated thereby or any Indemnified Person's actions or inactions in
   connection with any such advice, services or transactions except for
   liabilities that are determined by a judgment of a court of competent
   jurisdiction (not subject to further appeal) to have resulted from such
   Indemnified Person's gross negligence or willful misconduct in connection
   with any such advice, actions, inactions or services.

   If any term, provision, covenant or restriction contained in this Section is
   held by a court of competent jurisdiction or other authority to be invalid,
   void, unenforceable or against public policy, the remainder of the terms,
   provisions, covenants and restrictions contained in the Agreement (including
   this Section) shall remain in full force and effect and shall in no way be
   affected, impaired or invalidated.

   The provisions contained in this Section 3 shall remain in full force and
   effect (i) whether or not any of the transactions contemplated hereby are
   consummated, (ii) regardless of the termination or completion of any
   Indemnified Person's services hereunder, (iii) notwithstanding the
   termination of this Agreement and (iv) notwithstanding any investigation made
   by or on behalf of Sterling or any Indemnified Person.

   This Section 3 is for the benefit of the parties hereto and the Indemnified
   Persons, and may be enforced directly by any Indemnified Person, whether or
   not a party to this Agreement.

4. GOVERNING LAW. This Agreement shall be governed by and constructed in
   accordance with, the laws of the State of Texas, without giving effect to
   choice of law doctrines requiring the application of laws of any other
   jurisdiction.

If the foregoing meets with your approval and correctly expresses our agreement,
please sign and return the enclosed duplicate copy of this letter.

                                            Very truly yours,

                                            THE STERLING GROUP, INC.

                                            By: SUSAN O. RHENEY
                                            Name: SUSAN O. RHENEY
                                            Title: PRINCIPAL

ACKNOWLEDGED AND AGREED
TEXAS PETROCHEMICAL HOLDINGS, INC.

By: WILLIAM A. McMINN
Name: WILLIAM A. McMINN
Title: CHAIRMAN

TPC HOLDING CORP.

By: WILLIAM A. McMINN
Name: WILLIAM McMINN
Title: CHAIRMAN