Document:

<PAGE>   1
                                                                    EXHIBIT 4.19

         THIS INSTRUMENT OF RESIGNATION, APPOINTMENT AND ACCEPTANCE
("Instrument") dated to be effective as of July 27, 2001 (the "Effective Date"),
is by and among STERLING CHEMICALS, INC., a corporation organized under the laws
of the State of Delaware (the "Company"), STATE STREET BANK AND TRUST COMPANY
(SUCCESSOR TO FLEET NATIONAL BANK, THE INITIAL TRUSTEE), a Massachusetts banking
association with its principal office in Boston, Massachusetts (the "Resigning
Trustee") and HSBC BANK USA, a bank and trust company organized under the laws
of the State of New York ("Successor Trustee"). Capitalized terms not otherwise
defined herein shall have the same meaning ascribed to such terms in the
Indenture.

                                    RECITALS

         WHEREAS, pursuant to an Indenture dated as of April 7, 1997, as amended
and supplemented by the First Supplemental Indenture dated as of March 16, 1998
(collectively, the "Indenture") between the Company and the Resigning Trustee,
the Company issued $150,000,000 principal amount of its 11.25% Senior
Subordinated Notes due 2007 (the "Notes");

         WHEREAS, pursuant to section 8.08 of the Indenture, the Company
appointed the Resigning Trustee as the Indenture Trustee under the Indenture;

         WHEREAS, pursuant to section 2.03 of the Indenture, the Company also
appointed the Resigning Trustee as the Paying Agent and Registrar under the
Indenture;

         WHEREAS, there is presently issued and outstanding $150,000,000.00 in
aggregate principal amount of the Notes;

         WHEREAS, section 8.08 of the Indenture provides that the Resigning
Trustee may at any time resign by giving written notice of such resignation to
the Company and the Company shall promptly appoint a Successor Trustee;

         WHEREAS, the Resigning Trustee desires to resign and the Company
desires to appoint the Successor Trustee as Trustee, Paying Agent and Registrar
under the Indenture, to succeed the Resigning Trustee in such capacities under
the Indenture; and

         WHEREAS, the Successor Trustee is willing to accept the appointment as
Trustee, Paying Agent and Registrar under the Indenture;

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

         1. ACCEPTANCE OF RESIGNATION OF RESIGNING TRUSTEE; APPOINTMENT OF
SUCCESSOR TRUSTEE. The Resigning Trustee hereby resigns as Trustee, Paying Agent
and

<PAGE>   2

Registrar under the Indenture. The Company accepts the resignation of the
Resigning Trustee as Trustee, Paying Agent and Registrar and hereby appoints the
Successor Trustee as Trustee, Paying Agent and Registrar under the Indenture,
and vests and confirms to the Successor Trustee all rights, powers, trusts,
privileges, duties, security interests and obligations of such persons under the
Indenture, all effective as of the Effective Date.

         2. COMPANY REPRESENTATIONS AND WARRANTIES. The Company represents and
warrants to the Successor Trustee that:

         a. It is duly organized and validly existing;

         b. It has not entered into any amendment or supplement to the Indenture
         except as disclosed herein, and the Indenture is in full force and
         effect;

         c. An Event of Default has occurred under Section 7.01 of the Indenture
         by reason of the Company filing a petition for relief under chapter 11
         of title 11 of the United States Bankruptcy Code on July 16, 2001;

         d. The execution and delivery of this Instrument and the consummation
         of the transactions contemplated hereby do not and will not conflict
         with, or result in a breach of, any of the terms or provisions of, or
         constitute a default under, any contract, agreement, indenture or other
         instrument (including, without limitation, its certificate of
         incorporation and by-laws) to which it is a party or by which it or its
         property is bound, or any judgment, decree or order of any court or
         governmental agency or regulatory body or law, rule or regulation
         applicable to it or its property;

         e. No covenant or condition contained in the Indenture has been waived
         by the Company or, to the best of the Company's knowledge by holders of
         the percentage in aggregate principal amount of the Notes required to
         effect any such waiver;

         f. The Notes are validly issued securities of the Company;

         g. Any conditions precedent relating to the appointment of HSBC Bank
         USA, as successor Trustee, Paying Agent and Registrar under the
         Indenture for which the Company is responsible have been complied with
         by the Company; and

         h. Other than the Company's Chapter 11 case, there is no action, suit
         or proceeding pending, or to the best of the Company's knowledge,
         threatened against the Company before any Court or any governmental
         authority, arising out of any action or omissions by the Company under
         the Indenture.

                                       2
<PAGE>   3

         3. RESIGNING TRUSTEE REPRESENTATIONS AND WARRANTIES. The Resigning
Trustee hereby represents and warrants to the Successor Trustee that:

         a. No covenant or condition contained in the Indenture has been waived
         by the Resigning Trustee or to the best of the knowledge of the
         Resigning Trustee by the Note holders of the percentage in aggregate
         principal amount of the Notes required by the Indenture to effect any
         such waiver;

         b. There is no action, suit or proceeding pending or, to the best of
         the knowledge of the Resigning Trustee threatened, against the
         Resigning Trustee before any court or governmental authority arising
         out of any actual or alleged action or omission by the Resigning
         Trustee, whether as Trustee, Paying Agent or Registrar under the
         Indenture or otherwise;

         c. It has made, or promptly will make, available to the Successor
         Trustee originals, if available, or copies in its possession, of all
         documents relating to any of the Notes or the Indenture or any matter
         or thing pertaining to any thereof and all information in the
         possession of its corporate trust administration department relating to
         any of the foregoing and will furnish to the Successor Trustee such
         documents or information on or before the Effective Date.
         Notwithstanding the foregoing, the Resigning Trustee reserves the right
         to withhold documents, if any, which are subject to privilege;

         d. To the best of its knowledge, it has lawfully discharged its duties
         as Trustee, Paying Agent and Registrar under the Indenture;

         e. The Resigning Trustee certifies that $150,000,000.00 in principal
         amount on the Notes is outstanding and all interest thereon has been
         paid.

         f. As of the Effective Date, the Resigning Trustee will hold no
         property or monies under the Indenture, and will have transferred and
         delivered all property and monies held by it under the Indenture to the
         Successor Trustee.

         g. This Instrument has been duly authorized, executed and delivered on
         behalf of the Resigning Trustee and constitutes its legal, valid and
         binding obligation.

         h. The Resigning Trustee shall deliver to the Successor Trustee as of
         or immediately after the effective date hereof all of the documents
         listed on Exhibit A annexed hereto.

         4. SUCCESSOR TRUSTEE REPRESENTATIONS AND WARRANTY. The Successor
Trustee represents and warrants to the Resigning Trustee and the Company that,
(a) it is duly organized and validly existing, (b) it is eligible to serve as
Trustee, Paying Agent and Registrar under the Indenture and under the Trust
Indenture Act of 1939, as amended, (c) the execution and delivery of this
Instrument and the consummation of the transactions contemplated hereby do not
and will not conflict with, or result in a breach of, any of the terms or
provisions of, or constitute a default under, any contract,

                                       3
<PAGE>   4

agreement, indenture or other instrument (including, without limitation, its
certificate of incorporation and by-laws) to which it is a party or by which it
or its property is bound, or any judgment, decree or order of any court or
governmental agency or regulatory body or law, rule or regulation applicable to
it or its property; (d) this Instrument has been duly authorized, executed and
delivered on behalf of the Successor Trustee and constitutes its legal, valid
and binding obligation; and (e) all conditions precedent relating to the
appointment of Successor Trustee, as successor Trustee, Paying Agent and
Registrar under the Indenture for which the Successor Trustee is responsible
have been complied with by the Successor Trustee.

         5. ACCEPTANCE BY SUCCESSOR TRUSTEE. The Successor Trustee hereby
accepts, effective on the Effective Date, its appointment as Trustee, Paying
Agent and Registrar under the Indenture, and assumes all rights, powers, trusts,
duties and obligations of the Trustee, Paying Agent and Registrar under the
Indenture. The Successor Trustee will perform said rights, powers and duties
upon the terms and conditions set forth in the Indenture. Promptly after the
execution and delivery of this Instrument, the Successor Trustee shall cause a
notice, a form of which is annexed hereto as Exhibit B, to be sent to each
Holder of the Notes in accordance with the provisions of Section 8.08 of the
Indenture.

         6. ASSIGNMENT ETC. BY RESIGNING TRUSTEE. Effective on the Effective
Date, the Resigning Trustee hereby confirms, assigns, transfers, delivers and
conveys to the Successor Trustee, as Trustee, Paying Agent and Registrar under
the Indenture, upon the trusts expressed in the Indenture, all rights, powers,
trusts, privileges, duties and obligations, which the Resigning Trustee, now
holds under and by virtue of the Indenture, and effective as of such date does
hereby pay over to the Successor Trustee any and all property and moneys held by
the Resigning Trustee under and by virtue of the Indenture, subject nevertheless
to the lien provided by Section 8.07 of the Indenture, which lien the Resigning
Trustee expressly reserves to the fullest extent necessary to secure the
Company's obligations under the Indenture to the Resigning Trustee, which lien
shall also secure the Company's obligations under the Indenture to the Successor
Trustee.

         7. ADDITIONAL DOCUMENTATION. The Company and the Resigning Trustee, for
the purposes of more fully and certainly vesting in and confirming to the
Successor Trustee the rights, powers, trusts, privileges, duties and obligations
granted in the Indenture, agree, upon reasonable request of the Successor
Trustee, to execute, acknowledge and deliver such further instruments of
conveyance and further assurance and to do such other things as may reasonably
be required by the Successor Trustee.

         8. CHOICE OF LAWS. The laws of the State of New York shall govern this
Instrument.

         9. COUNTERPARTS. This Instrument may be executed in any number of
counterparts, each of which, when so executed and delivered, shall be an
original, but all counterparts shall constitute but one Instrument.

                                       4
<PAGE>   5

         10. SURVIVAL OF COMPANY'S OBLIGATIONS TO RESIGNING TRUSTEE.
Notwithstanding the resignation of the Resigning Trustee as Trustee, Paying
Agent and Registrar under the Indenture, nothing contained in this Instrument
shall in any way abrogate the obligations of the Company to the Resigning
Trustee under the Indenture or any lien created in favor of the Resigning
Trustee thereunder, including without limitation, the lien provided under
Section 8.07 of the Indenture.

         11. COMPANY'S OBLIGATION TO SUCCESSOR TRUSTEE. The Company hereby
acknowledges and reaffirms its obligations to the Successor Trustee as set forth
in Section 8.07 of the Indenture, which obligations shall survive the execution
hereof pursuant to the terms of the Indenture.

         12. ACKNOWLEDGEMENT OF RESIGNING TRUSTEE. The Resigning Trustee
acknowledges and agrees that it shall remain solely responsible for, and shall
promptly pay Successor Trustee, any and all costs, claims, liabilities, losses
or damages whatsoever, incurred by Successor Trustee, which arise out of actual,
alleged or adjudicated actions or omissions of the Resigning Trustee as Trustee,
Paying Agent and Registrar under the Indenture, unless such claims are contested
in good faith by Resigning Trustee. The Successor Trustee will furnish to the
Resigning Trustee, promptly after receipt, all documents with respect to any
such action for which the Resigning Trustee may be so responsible.

         13. NOTICES. All notices, whether faxed or mailed will be deemed
received when sent pursuant to the following instructions:

TO THE RESIGNING TRUSTEE:
         State Street Bank and Trust Company
         Attn.: Robert C. Butzier, Vice President
         2 Avenue de Lafayette, 6th Floor
         Boston, MA 02111
         FAX: 617-662-1456
         TEL: 617-662-1751

TO THE SUCCESSOR TRUSTEE
         HSBC Bank USA
         Issuer Services
         Attn.: Robert A. Conrad, Vice President
         10 E. 40th Street
         New York, NY  10016
         FAX:  212-525-1300
         TEL:  212-525-1314

                                       5
<PAGE>   6

TO THE COMPANY:
         Sterling Chemicals, Inc.
         Attn.: Kenneth M. Hale, General Counsel
         1200 Smith Street
         Suite 1900
         Houston, TX 77002
         FAX: 713-654-9577
         TEL: 713-654-9502

         14. CORPORATE TRUST OFFICE. References in the Indenture to "Corporate
Trust Office" or other similar terms shall be deemed to refer to the Corporate
Trust Office of the Successor Trustee at 10 E. 40th Street, New York, New York
10016 or any other office of the Successor Trustee at which, at any particular
time, its corporate trust business shall be administered.

         15. EFFECTIVENESS. This Agreement shall become effective as of the date
set forth herein upon the execution and delivery thereof by the duly authorized
representatives of each of the parties hereto.

         IN WITNESSETH WHEREOF, Sterling Chemicals, Inc., State Street Bank and
Trust Company and HSBC Bank USA have executed this Instrument as of the date set
forth above.

STERLING CHEMICALS, INC.

By
  -----------------------------------
   Its
      -------------------------------

STATE STREET BANK AND TRUST COMPANY

By
  -----------------------------------
   Its
      -------------------------------

HSBC BANK USA

By
  -----------------------------------
   Its
      -------------------------------

                                       6
<PAGE>   7

                                    EXHIBIT A

               Documents to be delivered to the Successor Trustee

         1. Executed Copy of the Indenture and supplement.
         2. Conformed Copy of the Indenture and supplement.
         3. Filed of closing documents.
         4. Copies of the most recent of each of the SEC reports delivered by
the Company pursuant to the Indenture.
         5. Copies of any official notices sent by the Trustee to all of the
Holders of the Notes pursuant to the terms of any Indenture during the past
twelve months and a copy of the most recent Trustee's Annual Report to Holders
if any.
         6. Certified List of Holders as of July __, 2001, certificate detail,
and all "stop transfers" and the reason for such "stop transfers" (or,
alternatively, if there are a substantial number of registered Holders, the
computer tape reflecting the identity, address, tax identification number and
detailed holdings of each such holder.)

         7. Debt service records or trust account statements for the one-year
period preceding the date of this Agreement.

         8. All unissued Notes inventory or DTC FAST held global certificates.

         9. Such other documents as the Successor Trustee may reasonably require
in order to transfer the appointment to it.

                                       7
<PAGE>   8

                                    EXHIBIT B

                                [HSBC Letterhead]

                                Notice to Holders

To the holders of the $150,000,00 aggregate principal amount of Sterling
Chemicals, Inc.'s (the "Company") 11.25% Senior Subordinated Notes due 2007 (the
"Notes') under the Indenture, dated as of April 7, 19997, as amended and
supplemented, by and between the Company and State Street and Trust Company
(successor to Fleet National Bank, initial trustee) as Indenture Trustee (the
"Notes" and said Indenture is hereinafter referred to as the "Indenture");

NOTICE IS HEREBY GIVEN, pursuant to Section 8.08 of the Indenture by and between
the Company and Indenture Trustee that Indenture Trustee has resigned as Trustee
under the Indenture.

Pursuant to Section 8.08 of the Indenture, HSBC Bank USA, a banking corporation
and trust company duly organized and existing under the laws of the State of New
York, has accepted appointment as Trustee under the Indenture. The address of
the Corporate Trust Office of HSBC Bank USA is 10 East 40th Street, New York,
New York 10016. HSBC Bank USA has also accepted appointment as Registrar and
Paying Agent under the Indenture.

State Street Bank and Trust Company's resignation as Trustee and HSBC Bank USA's
appointment as Successor Trustee become effective as of the close of business on
July 27, 2001.

Dated: New York, New York
       July __, 2001

                  HSBC Bank USA, as Successor Indenture Trustee<PAGE>   1
                                                                    EXHIBIT 10.1

                        STERLING CHEMICALS HOLDINGS, INC.
                            STERLING CHEMICALS, INC.

                   AMENDED AND RESTATED SUPPLEMENTAL PAY PLAN

                             PRELIMINARY STATEMENTS

A.   Sterling Chemicals Holdings, Inc. and Sterling Chemicals, Inc. are Delaware
     corporations.

B.   On March 8, 2001, the Holdings Board and the Chemicals Board (as such terms
     are defined below) approved a supplemental pay plan (the "Existing Plan").

C.   On July 13, 2001, the Holdings Board and the Chemicals Board approved
     certain amendments to the Existing Plan.

D.   The Holdings Board and the Chemicals Board desire to document such
     amendments to the Existing Plan by amending and restating the Existing Plan
     in its entirety, effective as of July 13, 2001 (the "Effective Date").

     NOW, THEREFORE, the Existing Plan is hereby amended and restated to read in
its entirety as follows:

                                    ARTICLE I

                         Definitions and Interpretations

     Section 1.01. Definitions. Capitalized terms used in this Plan shall have
the following respective meanings, except as otherwise provided or as the
context shall otherwise require:

     "Applicable Multiplier" means, with respect to any Participant for any
Calculation Date, the multiplier set forth below opposite such Participant's
Salary Grade as of such Computation Date:

<TABLE>
<CAPTION>
                 Salary Grade                          Applicable Multiplier
                 ------------                          ---------------------
     <S>                                                     <C>
     U.S. Salary Grades 25 through 28...............         0.0625
     U.S. Salary Grades 21 through 24...............         0.0500
     Canadian Salary Grade 15 and 16................         0.0500
     U.S. Salary Grades 19 and 20...................         0.0375
     Canadian Salary Grade 14.......................         0.0375
     U.S. Salary Grades 17 and 18...................         0.0250
</TABLE>

<PAGE>   2

<TABLE>
     <S>                                                     <C>
     Canadian Salary Grades 12 and 13...............         0.0250
</TABLE>

     "Base Salary" means, with respect to any Participant for any Calculation
Date, such Participant's annual base salary as of such Computation Date.

     "Benefit Plan" means any employee benefit plan (including any employee
benefit plan within the meaning of Section 3(3) of the Employee Retirement
Income Security Act of 1974), program, arrangement or practice maintained,
sponsored or provided by Holdings or any Subsidiary, including those relating to
bonuses, incentive compensation, retirement benefits, stock options, stock
ownership or stock awards, healthcare and medical benefits, disability benefits,
death benefits, disability, life, accident and travel insurance, sick leave,
vacation pay or termination pay.

     "Bonus Plan" means the Sterling Chemicals, Inc. Bonus Plan, as amended,
supplemented or modified from time to time in accordance with its terms.

     "Chairman" means the Chairman of the Board of Holdings or, in case of the
absence or disability of the Chairman of the Board, the Chief Executive Officer
of Holdings, or in the absence or disability of the Chairman of the Board or the
Chief Executive Officer, the President of Holdings.

     "Chemicals" means Sterling Chemicals, Inc. and any successor to all or
substantially all of the business, operations or assets thereof.

     "Chemicals Board" means the Board of Directors of Chemicals.

     "Company" means Holdings and the Subsidiaries, including Chemicals.

     "Compensation Committee" means the Compensation Committee of the Holdings
Board.

     "Computation Date" means the last day of March, June, September and
December of each year during the continuance of this Plan.

     "Holdings" means Sterling Chemicals Holdings, Inc. and any successor to all
or substantially all of the business, operations or assets thereof.

     "Holdings Board" means the Board of Directors of Holdings.

     "Participants" means, except as otherwise provided in Section 2.01(b), (i)
all salaried employees of the Company who are based in the United States and
have a Salary Grade of 18 or higher, (ii) all salaried employees of the Company
who are based in Canada and have a salary grade of 13 or higher and (iii) any
salaried employee of the Company designated as a Participant in an Instrument of
Designation executed and delivered by Holdings and such Participant in
accordance with Section 2.01(b).

                                      -2-

<PAGE>   3

     "Plan" means this Supplemental Pay Plan, as amended, supplemented or
modified from time to time in accordance with its terms.

     "Salary Grade" means, with respect to any Participant for any Computation
Date, such Participant's salary classification established by the Company as of
such Computation Date.

     "Supplemental Pay" means, with respect to any Participant, any payments
that the Company has made or is obligated to make to such Participant pursuant
to Section 2.02(a).

     "Subsidiary" means any corporation, limited partnership, general
partnership, limited liability company or other form of entity a majority of any
class of voting stock or other voting rights of which is owned, directly or
indirectly, by Holdings.

     Section 1.02. Interpretation. In this Plan, unless a clear contrary
intention appears, (a) the words "herein," "hereof" and "hereunder" and other
words of similar import refer to this Plan as a whole and not to any particular
Article, Section or other subdivision, (b) reference to any Article or Section,
means such Article or Section hereof and (c) the words "including" (and with
correlative meaning "include") means including, without limiting the generality
of any description preceding such term. The Article and Section headings herein
are for convenience only and shall not affect the construction hereof.

                                   ARTICLE II

                            Eligibility and Benefits

     Section 2.01. Eligible Employees. (a) This Plan is only for the benefit of
Participants, and no other employees or personnel shall be eligible to
participate in this Plan or to receive any rights or benefits hereunder.

     (b) The Chairman may from time to time designate as Participants under this
Plan one or more salaried employees of the Company based in the United States
having a Salary Grade of 17 or one or more salaried employees of the Company
based in Canada having a Salary Grade of 12. Each such designation shall be
evidenced by an Instrument of Designation signed by Holdings and the Participant
substantially in the form of Exhibit A hereto. Each such Instrument of
Designation, and the designation evidenced thereby, shall be binding on the
Company. In the event that the Holdings Board thereafter determines that any
such Participant should not continue to participate in this Plan, the Holdings
Board shall be permitted, subject to the limitations set forth below, to
terminate such Participant's participation in this Plan by providing such
Participant with a written notice of such termination, which notice shall state
that it is a termination notice given pursuant to this Section 2.01(b). Any such
termination shall be and become effective on the first Computation Date
occurring after written notice of such termination is delivered to such
Participant. Upon the effective date of such termination, such Participant shall
cease to be a Participant and, accordingly, such Participant shall no longer be

                                      -3-

<PAGE>   4

entitled to receive any rights or benefits hereunder; provided, however, that
such termination shall not (i) affect the rights or benefits of such Participant
or the obligations of the Company accrued under this Plan as of the effective
date of such termination or (ii) reduce or eliminate the amount of Supplemental
Pay payable to such Participant hereunder that is determined by reference to the
Computation Date that is the effective date of such termination.

     Section 2.02. Supplemental Pay. (a) On or before the tenth day after each
Computation Date, the Company shall pay each Participant an amount equal to such
Participant's Base Salary as of such Computation Date times such Participant's
Applicable Multiplier as of such Computation Date; provided, however, that such
Participant is an active employee of the Company as of the date such payment is
made and, provided further, that (i) with respect to each payment determined by
reference to the Computation Date March 31, 2001, the amount payable to each
such Participant shall be reduced by two-thirds and (ii) with respect to each
payment determined by reference to any other Computation Date, the amount
payable to any Participant who became a Participant during the calendar quarter
ending on such Computation Date shall be prorated based on the number of days in
such calendar quarter that such Participant was a Participant under this Plan.

     (b) Notwithstanding anything to the contrary contained in this Plan or the
Bonus Plan, the aggregate amount that may be or become payable under the Bonus
Plan to any Participant hereunder based upon the Company's financial performance
for any fiscal year shall be reduced, dollar for dollar, by the aggregate amount
of Supplemental Pay paid to such Participant that was determined by reference to
Computation Dates occurring within such fiscal year. To the extent of any
inconsistencies between the terms of this Plan and the terms of the Bonus Plan,
the terms of this Plan shall govern and control.

     (c) Participation in this Plan is voluntary. The Company may require that
each eligible employee execute a participation agreement as a condition to
becoming a Participant hereunder. By agreeing to participate in this Plan or by
accepting any benefits under this Plan, a Participant unconditionally agrees for
all purposes under this Plan to be bound by all of the terms and conditions of
this Plan, including the provisions of Article III hereof.

     Section 2.03. Cost of Plan; Plan Unfunded; Participant's Rights Unsecured.
The entire cost of this Plan shall be borne by the Company, and no contributions
shall be required of the Participants. The Company shall not be required to
establish any special or separate fund or make any other segregation of funds or
assets to assure the payment of any benefit hereunder. The right of any
Participant to receive the benefits provided for herein shall be an unsecured
claim against the general assets of the Company.

                                   ARTICLE III

                               Dispute Resolution

     Section 3.01. Negotiation. Subject to Section 3.03, in case a dispute or
controversy shall arise between any Participant (or any person claiming by,
through or under any Participant)

                                      -4-

<PAGE>   5

and the Company relating to or arising out of this Plan, either disputant may
give written notice to the other disputant ("Dispute Notice") that it wishes to
resolve such dispute or controversy by negotiations, in which event the
disputants shall attempt in good faith to negotiate a resolution of such dispute
or controversy. If the dispute or controversy is not so resolved within 30 days
after the effective date of the Dispute Notice, subject to Section 3.03, either
disputant may initiate arbitration of the matter as provided in Section 3.02.
All negotiations pursuant to this Section 3.01 shall be held at the Company's
principal offices in Houston, Texas (or such other place as the disputants shall
mutually agree) and shall be treated as compromise and settlement negotiations
for the purposes of the federal and state rules of evidence and procedure.

     Section 3.02. Arbitration. Subject to Section 3.03, any dispute or
controversy arising out of or relating to this Plan which has not been resolved
by negotiations in accordance with Section 3.01 within 60 days of the effective
date of the Dispute Notice shall be finally settled by arbitration conducted
expeditiously in accordance with the labor arbitration rules of the American
Arbitration Association. The arbitrator shall be not empowered to award damages
in excess of compensatory damages and each disputant shall be deemed to have
irrevocably waived any damages in excess of compensatory damages. The
arbitrator's decision shall be final and legally binding on the disputants and
their successors and assigns. The fees and expenses of the arbitrator shall be
borne solely by the non-prevailing disputant or, in the event there is no clear
prevailing disputant, as the arbitrator deems appropriate. All arbitration
conferences and hearings shall be held in Houston, Texas.

     Section 3.03. Exclusivity, etc. The dispute resolution procedures set forth
in Sections 3.01 and 3.02 shall not apply to any matter which, by the express
provisions of this Plan, is to be finally determined by the Compensation
Committee or by an accounting firm or employee benefits firm unless and until
the Compensation Committee, accounting firm or employee benefits firm issues its
decision. Any such determination by the Compensation Committee or an accounting
firm or employee benefits firm shall be final and may not be overturned unless
such determination is found to be arbitrary and capricious or an abuse of
discretion. No legal action may be brought with respect to this Plan except for
the purpose of specifically enforcing the provisions of this Article III or for
the purpose of enforcing any arbitration award made pursuant to Section 3.02.

                                   ARTICLE IV

                            Miscellaneous Provisions

     Section 4.01. Cumulative Benefits. Except as provided in Section 2.02(b)
(or as may otherwise be agreed by the applicable Participant), the rights and
benefits provided to any Participant under this Plan are cumulative of, and are
in addition to, all of the other rights and benefits provided to such
Participant under any Benefit Plan or any agreement between such Participant and
the Company.

     Section 4.02. Amendment and Termination. The Holdings Board and the
Chemicals Board shall be entitled to amend or terminate this Plan at any time
and for any reason; provided,

                                      -5-

<PAGE>   6

however, that no amendment or termination of this Plan shall (a) be or become
effective other than on a Computation Date, (b) affect the rights or benefits of
any Participant or the obligations of the Company accrued under this Plan as of
the effective date of such termination or amendment or (c) reduce or eliminate
the amount of Supplemental Pay payable to such Participant that is determined by
reference to the Computation Date that is the effective date of such amendment
or termination for such Participant. For purposes of this Section 4.02, the
termination of a Participant's participation in this Plan in accordance with
Section 2.01(b) shall not be deemed to be an amendment or termination of this
Plan.

     Section 4.03. Administration. (a) The Compensation Committee is, as
respects the rights and obligations of all parties with an interest in this
Plan, given the powers, rights and duties specifically stated elsewhere in this
Plan and, in addition, is given full power and final discretionary authority to:

          (i) make determinations with respect to the administration of this
     Plan, construe and interpret its provisions, take all other actions deemed
     necessary or advisable for the proper administration of this Plan and
     determine all questions arising under this Plan, including the power to
     determine the rights or eligibility of Participants and any other persons,
     and the amounts of their benefits under this Plan, and to remedy
     ambiguities, inconsistencies or omissions;

          (ii) adopt such rules of procedure and regulations as in its opinion
     may be necessary for the proper and efficient administration of this Plan;

          (iii) enforce this Plan in accordance with its terms and in accordance
     with any rules of procedure and regulations adopted by the Compensation
     Committee pursuant to clause (ii) above; and

          (iv) employ agents, attorneys, accountants or other persons (who also
     may be employed by the Company), and allocate or delegate to them such
     powers, rights and duties as the Compensation Committee may consider
     necessary or advisable to properly carry out the administration of this
     Plan; provided, however, that such allocation or delegation and the
     acceptance thereof by such agents, attorneys, accountants or other persons
     are in writing.

The Compensation Committee shall have no authority to change or modify the level
of benefits provided for Participants under this Plan. No discretionary action
by the Compensation Committee shall amend or supersede the express provisions of
this Plan.

     (b) Subject to applicable law, any determination, construction or
interpretation of the provisions of this Plan, and any decision on any matter
within the discretion of the Compensation Committee, that is made by the
Compensation Committee in good faith shall be binding on all persons. In case of
any claim that the Compensation Committee (or any member thereof) did not act in
good faith, the burden of proof shall rest with the person or entity claiming
the absence of good faith.

                                      -6-

<PAGE>   7

     (c) The members of the Compensation Committee shall receive no additional
compensation for their services relating to this Plan. Any expenses properly
incurred by the Compensation Committee incident to this Plan, including the cost
of any bond required by applicable law, shall be paid by the Company.

     (d) The Company shall indemnify and hold harmless each member of the
Compensation Committee against and all expenses and liabilities arising out of
his or her administrative functions or fiduciary responsibilities, including any
expenses and liabilities that are caused by or result from an act or omission
constituting the negligence of such member in the performance of such functions
or responsibilities, but excluding expenses and liabilities that are caused by
or result from such member's own gross negligence or willful misconduct.
Expenses against which such member shall be indemnified hereunder shall include,
without limitation, the amounts of any settlement or judgment, costs, counsel
fees and related charges reasonably incurred in connection with a claim asserted
or a proceeding brought or settlement thereof.

     Section 4.04. Assignability. The Company shall have the right to assign
this Plan and to delegate its duties and obligations hereunder, but not
otherwise; provided, however, that no such assignment shall relieve or discharge
the Company of or from any of its obligations under this Plan. Unless otherwise
approved by the Compensation Committee, no Participant shall transfer or assign
any of his or her rights under this Plan except by will or the laws of descent
and distribution. Except as otherwise provided by law, no benefit, right or
interest of any Participant under this Plan shall be subject to pledge,
encumbrance or charge, seizure, attachment or legal, equitable or other process,
or be liable for, or subject to, debts, liabilities or other obligations.

     Section 4.05. Consolidations, Mergers, Etc. Each of Holdings and Chemicals
will require any successor (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to all or substantially all of its business,
operations or assets to expressly assume and agree to perform this Plan in
writing, in the same manner and to the same extent that Holdings or Chemicals,
as the case may be, would be required to perform hereunder if no such succession
had taken place.

     Section 4.06. Benefit and Burden. This Plan shall be binding upon and inure
to the benefit of the Company and its successors and assigns. This Plan and all
rights of each Participant shall inure to the benefit of and be enforceable by
such Participant and his or her personal or legal representatives, executors,
administrators, heirs and permitted assigns. If any Participant should die while
any amounts are due and payable to such Participant hereunder, all such amounts,
unless otherwise provided herein, shall be paid in accordance with the terms of
this Plan to such Participant's devisees, legatees or other designees or, if
there be no such devisees, legatees or other designees, to such Participant's
estate.

     Section 4.07. Notices. All notices and other communications provided for in
this Plan shall be in writing and shall be sent, delivered or mailed, addressed
(a) if to Holdings, Chemicals or any other Subsidiary, at Holdings' principal
office address or such other address as

                                      -7-

<PAGE>   8

Holdings may have designated by written notice to all Participants for purposes
hereof, directed to the attention of the Treasurer, and (b) if to any
Participant, at his or her residence address on the records of Holdings or to
such other address as he or she may have designated to Holdings in writing for
purposes hereof. Each such notice or other communication shall be deemed to have
been duly given or mailed by United States registered mail, return receipt
requested, postage prepaid, except that any change of notice address shall be
effective only upon receipt.

     Section 4.08. Withholdings. The Company shall have the right to deduct from
any Supplemental Pay all taxes (federal, state or other) and other payments
which it is required to withhold therefrom.

     Section 4.09. No Employment Rights Conferred. Nothing contained in this
Plan shall (a) confer upon any Participant any right with respect to
continuation of employment with the Company or (b) subject to the rights and
benefits of any Participant hereunder, interfere in any way with the right of
the Company to terminate such Participant's employment at any time.

     Section 4.10. Currency. All sums and amounts payable or to become payable
pursuant to this Plan shall be payable and paid in currency of the United States
of America; provided, however, that if any sum or amount payable or to become
payable pursuant to this Plan is to be made to any Participant who is based
outside of the United States, then such sum or amount shall be paid in the
currency of the country in which such Participant was based on the relevant due
date, with such sum or amount to be converted from United States dollars into
such other currency at the rate of exchange for such currencies prevailing on
the business day immediately preceding such due date.

     Section 4.11. Governing Law. This Plan shall be governed in accordance with
the laws of the State of Texas (without giving effect to conflicts of laws
principles thereof) and applicable federal law.

     IN WITNESS WHEREOF, and as conclusive evidence of the adoption of this Plan
by the Holdings Board and the Chemicals Board, Holdings and Chemicals have each
caused this Plan to be duly executed in its name and behalf by its proper
officer thereunto duly authorized as of March 1, 2001.

                                   STERLING CHEMICALS HOLDINGS, INC.

                                   By:
                                       -----------------------------------------
                                       Frank P. Diassi, Chairman of the Board

                                       -8-

<PAGE>   9
                                   STERLING CHEMICALS, INC.

                                   By:
                                       -----------------------------------------
                                       Frank P. Diassi, Chairman of the Board

                                       -9-

<PAGE>   10

                                    EXHIBIT A

                        STERLING CHEMICALS HOLDINGS, INC.

                            Instrument of Designation

     THIS INSTRUMENT OF DESIGNATION (this "Instrument") is intended to evidence
the designation by the Chairman of the Board of Sterling Chemicals Holdings,
Inc., a Delaware corporation (the "Corporation"), of the undersigned employee as
a "Participant," within the meaning of that certain Supplemental Pay Plan of the
Corporation and Sterling Chemicals, Inc., a Delaware corporation.

     IN WITNESS WHEREOF, the Corporation has caused its duly authorized officer
to execute this Instrument effective as of the date set forth below.

Dated:                                STERLING CHEMICALS HOLDINGS, INC.
       -------------------

                                      By:
                                          --------------------------------------
                                          Frank P. Diassi, Chairman of the Board

EMPLOYEE:

-----------------------------------
Printed Name:
              ---------------------

                                      A-i

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