Document:

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                                                                   Exhibit 10.28

                                CHANGE-OF-CONTROL

                              EMPLOYMENT AGREEMENT

               AGREEMENT, dated as of the 2nd day of July, 2001 (this
"Agreement"), by and between Hercules Incorporated, a Delaware corporation (the
"Company"), and Fred G. Aanonsen (the "Executive").

               WHEREAS, the Board of Directors of the Company (the "Board"), has
determined that it is in the best interests of the Company and its
shareholders/stockholders to assure that the Company will have the continued
dedication of the Executive, notwithstanding the possibility, threat or
occurrence of a Change of Control (as defined herein). The Board believes it is
imperative to diminish the inevitable distraction of the Executive by virtue of
the personal uncertainties and risks created by a pending or threatened Change
of Control and to encourage the Executive's full attention and dedication to the
current Company in the event of any threatened or pending Change of Control, and
to provide the Executive with compensation and benefits arrangements upon a
Change of Control that ensure that the compensation and benefits expectations of
the Executive will be satisfied and that are competitive with those of other
corporations. Therefore, in order to accomplish these objectives, the Board has
caused the Company to enter into this Agreement.

               NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

SECTION 1.     CERTAIN DEFINITIONS.

               (a) "Effective Date" means the first date during the Change of
Control Period (as defined herein) on which a Change of Control occurs.
Notwithstanding anything in this Agreement to the contrary, if a Change of
Control occurs and if the Executive's employment with the Company is terminated
prior to the date on which the Change of Control occurs, and if it is reasonably
demonstrated by the Executive that such termination of employment (1) was at the
request of a third party that has taken steps reasonably calculated to effect a
Change of Control or (2) otherwise arose in connection with or anticipation of a
Change of Control, then "Effective Date" means the date immediately prior to the
date of such termination of employment.

               (b) "Change of Control Period" means the period commencing on the
date hereof and ending on the third anniversary of the date hereof; provided,
however, that, commencing on the date one year after the date hereof, and on
each annual anniversary of such date (such date and each annual anniversary
thereof, the "Renewal Date"), unless previously terminated, the Change of
Control Period shall be automatically extended so as to terminate three years
from such Renewal Date, unless, at least 60 days prior to the Renewal Date, the
Company shall give notice to the Executive that the Change of Control Period
shall not be so extended.

               (c) "Affiliated Company" means any company controlled by,
controlling or under common control with the Company.

               (d) "Change of Control" means:
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               (1) The acquisition by any individual, entity or group (within
the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of
1934, as amended (the "Exchange Act")) (a "Person") of beneficial ownership
(within the meaning of Rule 13d-3 promulgated under the Exchange Act) of 20% or
more of either (A) the then-outstanding shares of common stock of the Company
(the "Outstanding Company Common Stock") or (B) the combined voting power of the
then-outstanding voting securities of the Company entitled to vote generally in
the election of directors (the "Outstanding Company Voting Securities");
provided, however, that, for purposes of this Section 1(d), the following
acquisitions shall not constitute a Change of Control: (i) any acquisition
directly from the Company, (ii) any acquisition by the Company, (iii) any
acquisition by any employee benefit plan (or related trust) sponsored or
maintained by the Company or any Affiliated Company or (iv) any acquisition by
any corporation pursuant to a transaction that complies with Sections
1(d)(3)(A), 1(d)(3)(B) and 1(d)(3)(C).

               (2) The individuals listed below (the "Incumbent Board") cease
for any reason to constitute at least a majority of the Board; provided,
however, that any individual becoming a director subsequent to May 17, 2001
whose election, or nomination for election by the Company's shareholders, was
approved by a vote of at least a majority of the directors then comprising the
Incumbent Board shall be considered as though such individual were a member of
the Incumbent Board, but excluding, for this purpose, any such individual whose
initial assumption of office occurs as a result of an actual or threatened
election contest with respect to the election or removal of directors or other
actual or threatened solicitation of proxies or consents by or on behalf of a
Person other than the Board. Consistent with the offer of employment of May 17,
2001 and acceptance thereof by the Executive on May 17, 2001, the following
individuals constitute the Incumbent Board: John G. Drosdick, Richard Fairbanks,
Thomas L. Gossage, Alan R. Hirsig, Edith E. Holiday, William H. Joyce, Gaynor N.
Kelley, George MacKenzie, Ralph L. MacDonald, H. Eugene McBrayer, Peter
McCausland, John A. H. Shober and Paula A. Sneed.

               (3) Approval by the shareholders of the Company of a
reorganization, merger, consolidation or sale or other disposition of all or
substantially all of the assets of the Company (a "Business Combination"), in
each case, unless, following such Business Combination, (A) all or substantially
all of the individuals and entities that were the beneficial owners of the
Outstanding Company Common Stock and the Outstanding Company Voting Securities
immediately prior to such Business Combination beneficially own, directly or
indirectly, 60% or more of the then-outstanding shares of common stock and the
combined voting power of the then-outstanding voting securities entitled to vote
generally in the election of directors, as the case may be, of the corporation
resulting from such Business Combination (including, without limitation, a
corporation that, as a result of such transaction, owns the Company or all or
substantially all of the Company's assets either directly or through one or more
subsidiaries) in substantially the same proportions as their ownership
immediately prior to such Business Combination of the Outstanding Company Common
Stock and the Outstanding Company Voting Securities, as the case may be, (B) no
Person (excluding any corporation resulting from such Business Combination or
any employee benefit plan (or related trust) of the Company or such corporation
resulting from such Business Combination) beneficially owns, directly or
indirectly, 20% or more of, respectively, the then-outstanding shares of common
stock of the corporation resulting from such Business Combination or the
combined voting power of

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the then-outstanding voting securities of such corporation, except to the extent
that such ownership existed prior to the Business Combination, and (C) at least
a majority of the members of the board of directors of the corporation resulting
from such Business Combination were members of the Incumbent Board at the time
of the execution of the initial agreement or of the action of the Board
providing for such Business Combination; or

               (4) Approval by the shareholders of the Company of a complete
liquidation or dissolution of the Company.

SECTION 2.     EMPLOYMENT PERIOD. The Company hereby agrees to continue the
Executive in its employ, subject to the terms and conditions of this Agreement,
for the period commencing on the Effective Date and ending on the third
anniversary of the Effective Date (the "Employment Period"). The Employment
Period shall terminate upon the Executive's termination of employment for any
reason.

SECTION 3.     TERMS OF EMPLOYMENT.

               (a) POSITION AND DUTIES.

               (1) During the Employment Period, (A) the Executive's position
(including status, offices, titles and reporting requirements), authority,
duties and responsibilities shall be at least commensurate in all material
respects with the most significant of those held, exercised and assigned at any
time during the 120-day period immediately preceding the Effective Date and (B)
the Executive's services shall be performed at the office where the Executive
was employed immediately preceding the Effective Date or at any other location
less than 30 miles from such office.

               (2) During the Employment Period, and excluding any periods of
vacation and sick leave to which the Executive is entitled, the Executive agrees
to devote reasonable attention and time during normal business hours to the
business and affairs of the Company and, to the extent necessary to discharge
the responsibilities assigned to the Executive hereunder, to use the Executive's
reasonable best efforts to perform faithfully and efficiently such
responsibilities. During the Employment Period, it shall not be a violation of
this Agreement for the Executive to (A) serve on corporate, civic or charitable
boards or committees, (B) deliver lectures, fulfill speaking engagements or
teach at educational institutions and (C) manage personal investments, so long
as such activities do not significantly interfere with the performance of the
Executive's responsibilities as an employee of the Company in accordance with
this Agreement. It is expressly understood and agreed that, to the extent that
any such activities have been conducted by the Executive prior to the Effective
Date, the continued conduct of such activities (or the conduct of activities
similar in nature and scope thereto) subsequent to the Effective Date shall not
thereafter be deemed to interfere with the performance of the Executive's
responsibilities to the Company.

               (b) COMPENSATION.

               (1) BASE SALARY. During the Employment Period, the Executive
shall receive an annual base salary (the "Annual Base Salary") at an annual rate
at least equal to 12 times the highest monthly base salary paid or payable,
including any base salary that has been

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earned but deferred, to the Executive by the Company and the Affiliated
Companies in respect of the 12-month period immediately preceding the month in
which the Effective Date occurs. The Annual Base Salary shall be paid at such
intervals as the Company pays executive salaries generally. During the
Employment Period, the Annual Base Salary shall be reviewed at least annually,
beginning no more than 12 months after the last salary increase awarded to the
Executive prior to the Effective Date. Any increase in the Annual Base Salary
shall not serve to limit or reduce any other obligation to the Executive under
this Agreement. The Annual Base Salary shall not be reduced after any such
increase and the term "Annual Base Salary" shall refer to the Annual Base Salary
as so increased.

               (2) ANNUAL BONUS. In addition to the Annual Base Salary, the
Executive shall be awarded, for each fiscal year ending during the Employment
Period, an annual bonus (the "Annual Bonus") in cash at least equal to the
Executive's Recent Target Bonus, as DEFINED in the next sentence. The "Recent
Target Bonus" means the Annual Base Salary times a percentage equal to the
percentage of base salary most recently established, before the Effective Date,
for purposes of determining the Executive's target bonus under the Company's
Management Incentive Compensation Plan or any predecessor or successor plan (the
"MICP"). Each such Annual Bonus shall be paid no later than the end of the third
month of the fiscal year next following the fiscal year for which the Annual
Bonus is awarded, unless the Executive shall elect to defer the receipt of such
Annual Bonus. Any bonus paid to the Executive under the MICP as a result of the
Change of Control (a "Change of Control Bonus") shall be taken into account in
determining whether the requirements of this Section 3(b)(2) have been met with
respect to the fiscal year in which the Change of Control occurs.

               (3) INCENTIVE, SAVINGS AND RETIREMENT PLANS. During the
Employment Period, the Executive shall be entitled to participate in all cash
incentive, equity incentive, savings and retirement plans, practices, policies,
and programs applicable generally to other peer executives of the Company and
the Affiliated Companies, but in no event shall such plans, practices, policies
and programs provide the Executive with incentive opportunities (measured with
respect to both regular and special incentive opportunities, to the extent, if
any, that such distinction is applicable), savings opportunities and retirement
benefit opportunities, in each case, less favorable, in the aggregate, than the
most favorable of those provided by the Company and the Affiliated Companies for
the Executive under such plans, practices, policies and programs as in effect at
any time during the 120-day period immediately preceding the Effective Date or,
if more favorable to the Executive, those provided generally at any time after
the Effective Date to other peer executives of the Company and the Affiliated
Companies. The Executive shall also continue to be entitled to any supplemental
pension benefits to which he may be entitled pursuant to any individual
agreement with the company or any Affiliated Companies (collectively, "Enhanced
Pension Benefits").

               (4) WELFARE BENEFIT PLANS. During the Employment Period, the
Executive and/or the Executive's family, as the case may be, shall be eligible
for participation in and shall receive all benefits under welfare benefit plans,
practices, policies and programs provided by the Company and the Affiliated
Companies (including, without limitation, medical, prescription, dental,
disability, employee life, group life, accidental death and travel accident
insurance plans and programs) to the extent applicable generally to other peer
executives of the Company and the Affiliated Companies, but in no event shall
such plans, practices, policies and

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programs provide the Executive with benefits that are less favorable, in the
aggregate, than the most favorable of such plans, practices, policies and
programs in effect for the Executive at any time during the 120-day period
immediately preceding the Effective Date or, if more favorable to the Executive,
those provided generally at any time after the Effective Date to other peer
executives of the Company and the Affiliated Companies.

               (5) EXPENSES. During the Employment Period, the Executive shall
be entitled to receive prompt reimbursement for all reasonable expenses incurred
by the Executive in accordance with the most favorable policies, practices and
procedures of the Company and the Affiliated Companies in effect for the
Executive at any time during the 120-day period immediately preceding the
Effective Date or, if more favorable to the Executive, as in effect generally at
any time thereafter with respect to other peer executives of the Company and the
Affiliated Companies.

               (6) FRINGE BENEFITS. During the Employment Period, the Executive
shall be entitled to fringe benefits, including, without limitation, if
applicable, tax and financial planning services, payment of club dues, and use
of an automobile and payment of related expenses, in accordance with the most
favorable plans, practices, programs and policies of the Company and the
Affiliated Companies in effect for the Executive at any time during the 120-day
period immediately preceding the Effective Date or, if more favorable to the
Executive, as in effect generally at any time thereafter with respect to other
peer executives of the Company and the Affiliated Companies.

               (7) OFFICE AND SUPPORT STAFF. During the Employment Period, the
Executive shall be entitled to an office or offices of a size and with
furnishings and other appointments, and to exclusive personal secretarial and
other assistance, at least equal to the most favorable of the foregoing provided
to the Executive by the Company and the Affiliated Companies at any time during
the 120-day period immediately preceding the Effective Date or, if more
favorable to the Executive, as provided generally at any time thereafter with
respect to other peer executives of the Company and the Affiliated Companies.

               (8) VACATION. During the Employment Period, the Executive shall
be entitled to paid vacation in accordance with the most favorable plans,
policies, programs and practices of the Company and the Affiliated Companies as
in effect for the Executive at any time during the 120-day period immediately
preceding the Effective Date or, if more favorable to the Executive, as in
effect generally at any time thereafter with respect to other peer executives of
the Company and the Affiliated Companies.

               (9) SPECIAL PAYMENT. If a Change of Control occurs on or before
April 30, 2002, and in connection therewith, all or substantially all of the
common stock of the Company (the Common Stock) is purchased for cash and all or
substantially all then-outstanding employee stock options granted by the Company
are cancelled in exchange for cash or no consideration and without being
replaced by comparable new stock options, then the Company shall pay the
Executive, within five business days after the Change of Control, a cash payment
equal to $125,000 less the product of (1) the excess, if any, of the per-share
amount of the cash paid for the Common Stock, over $12.00 times (2) 52,000;
provided, that if there is no such excess described in clause (1), then such
cash payment shall equal $125,000.

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SECTION 4.     TERMINATION OF EMPLOYMENT.

               (a) DEATH OR DISABILITY. The Executive's employment shall
terminate automatically if the Executive dies during the Employment Period. If
the Company determines in good faith that the Disability (as defined herein) of
the Executive has occurred during the Employment Period (pursuant to the
definition of "Disability"), it may give to the Executive written notice in
accordance with Section 11(b) of its intention to terminate the Executive's
employment. In such event, the Executive's employment with the Company shall
terminate effective on the 30th day after receipt of such notice by the
Executive (the "Disability Effective Date"), provided that, within the 30 days
after such receipt, the Executive shall not have returned to full-time
performance of the Executive's duties. "Disability" means the absence of the
Executive from the Executive's duties with the Company on a full-time basis for
180 consecutive business days as a result of incapacity due to mental or
physical illness that is determined to be total and permanent by a physician
selected by the Company or its insurers and acceptable to the Executive or the
Executive's legal representative.

               (b) CAUSE. The Company may terminate the Executive's employment
during the Employment Period for Cause. "Cause" means:

               (1) the willful and continued failure of the Executive to perform
substantially the Executive's duties (as contemplated by Section 3(a)(1)(A))
with the Company or any Affiliated Company (other than any such failure
resulting from incapacity due to physical or mental illness or following the
Executive's delivery of a Notice of Termination for Good Reason), after a
written demand for substantial performance is delivered to the Executive by the
Board or the Chief Executive Officer of the Company that specifically identifies
the manner in which the Board or the Chief Executive Officer of the Company
believes that the Executive has not substantially performed the Executive's
duties, or

               (2) the willful engaging by the Executive in illegal conduct or
gross misconduct that is materially and demonstrably injurious to the Company.

For purposes of this Section 4(b), no act, or failure to act, on the part of the
Executive shall be considered "willful" unless it is done, or omitted to be
done, by the Executive in bad faith or without reasonable belief that the
Executive's action or omission was in the best interests of the Company. Any
act, or failure to act, based upon authority given pursuant to a resolution duly
adopted by the Board or upon the instructions of the Chief Executive Officer of
the Company or a senior officer of the Company or based upon the advice of
counsel for the Company shall be conclusively presumed to be done, or omitted to
be done, by the Executive in good faith and in the best interests of the
Company. The cessation of employment of the Executive shall not be deemed to be
for Cause unless and until there shall have been delivered to the Executive a
copy of a resolution duly adopted by the affirmative vote of not less than
three-quarters of the entire membership of the Board (excluding the Executive,
if the Executive is a member of the Board) at a meeting of the Board called and
held for such purpose (after reasonable notice is provided to the Executive and
the Executive is given an opportunity, together with counsel for the Executive,
to be heard before the Board), finding that, in the good faith opinion of the
Board, the Executive is guilty of the conduct described in Section 4(b)(1) or
4(b)(2), and specifying the particulars thereof in detail.

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               (c) GOOD REASON. The Executive's employment may be terminated by
the Executive for Good Reason or by the Executive voluntarily without Good
Reason. "Good Reason" means:

               (1) the assignment to the Executive of any duties inconsistent in
any respect with the Executive's position (including status, offices, titles and
reporting requirements), authority, duties or responsibilities as contemplated
by Section 3(a), or any other diminution in such position, authority, duties or
responsibilities (whether or not occurring solely as a result of the Company's
ceasing to be a publicly traded entity), excluding for this purpose an isolated,
insubstantial and inadvertent action not taken in bad faith and that is remedied
by the Company promptly after receipt of notice thereof given by the Executive;

               (2) any failure by the Company to comply with any of the
provisions of Section 3(b), other than an isolated, insubstantial and
inadvertent failure not occurring in bad faith and that is remedied by the
Company promptly after receipt of notice thereof given by the Executive;

               (3) the Company's requiring the Executive (i) to be based at any
office or location other than as provided in Section 3(a)(1)(B), (ii) to be
based at a location other than the principal executive offices of the Company if
the Executive was employed at such location immediately preceding the Effective
Date, or (iii) to travel on Company business to a substantially greater extent
than required immediately prior to the Effective Date;

               (4) any purported termination by the Company of the Executive's
employment otherwise than as expressly permitted by this Agreement; or

               (5) any failure by the Company to comply with and satisfy Section
10(c).

For purposes of this Section 4(c), any good faith determination of Good Reason
made by the Executive shall be conclusive. The Executive's mental or physical
incapacity following the occurrence of an event described above in clauses (1)
through (5) shall not affect the Executive's ability to terminate employment for
Good Reason.

               (d) NOTICE OF TERMINATION. Any termination by the Company for
Cause, other than for Cause, or by the Executive for Good Reason, shall be
communicated by Notice of Termination to the other party hereto given in
accordance with Section 11(b). "Notice of Termination" means a written notice
that (1) indicates the specific termination provision in this Agreement relied
upon, (2) to the extent applicable, sets forth in reasonable detail the facts
and circumstances claimed to provide a basis for termination of the Executive's
employment under the provision so indicated, and (3) if the Date of Termination
(as defined herein) is other than the date of receipt of such notice, specifies
the Date of Termination (which Date of Termination shall be not more than 30
days after the giving of such notice). The failure by the Executive or the
Company to set forth in the Notice of Termination any fact or circumstance that
contributes to a showing of Good Reason or Cause shall not waive any right of
the Executive or the Company, respectively, hereunder or preclude the Executive
or the Company, respectively, from

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asserting such fact or circumstance in enforcing the Executive's or the
Company's respective rights hereunder.

               (e) DATE OF TERMINATION. "Date of Termination" means (1) if the
Executive's employment is terminated by the Company for Cause, or by the
Executive for Good Reason, the date of receipt of the Notice of Termination or
any later date specified in the Notice of Termination, (which date shall not be
more than 30 days after the giving of such notice), as the case may be, (2) if
the Executive's employment is terminated by the Company other than for Cause or
Disability, the Date of Termination shall be the date on which the Company
notifies the Executive of such termination, and (3) if the Executive's
employment is terminated by reason of death or Disability, the Date of
Termination shall be the date of death of the Executive or the Disability
Effective Date, as the case may be.

SECTION 5.      OBLIGATIONS OF THE COMPANY UPON TERMINATION.

               (a) GOOD REASON; OTHER THAN FOR CAUSE, DEATH OR DISABILITY. If,
during the Employment Period, the Company terminates the Executive's employment
other than for Cause or Disability or the Executive terminates employment for
Good Reason:

               (1) the Company shall pay to the Executive, in a lump sum in cash
within 30 days after the Date of Termination, the aggregate of the following
amounts:

                  (A) the sum of: (i) the Executive's Annual Base Salary through
         the Date of Termination to the extent not theretofore paid; (ii) the
         product of (x) the higher of (I) the Recent Target Bonus and (II) the
         Annual Bonus paid or payable, including any bonus or portion thereof
         that has been earned but deferred (and annualized for any fiscal year
         consisting of less than 12 full months or during which the Executive
         was employed for less than 12 full months), for the most recently
         completed fiscal year during the Employment Period, if any (such higher
         amount, the "Highest Annual Bonus") and (y) a fraction, the numerator
         of which is the number of days in the current fiscal year through the
         Date of Termination and the denominator of which is 365; provided, that
         if the Date of Termination occurs in the same fiscal year as the Change
         of Control, then such product shall be reduced (but not below zero) by
         the amount of any Change of Control Bonus payable to the Executive; and
         (iii) any accrued vacation pay, in each case, to the extent not
         theretofore paid (the sum of the amounts described in subclauses (i),
         (ii) and (iii), the "Accrued Obligations"); and

                  (B) the amount equal to the product of (i) three and (ii) the
         sum of (x) the Executive's Annual Base Salary and (y) the Highest
         Annual Bonus.

               (2) for three years after the Executive's Date of Termination, or
such longer period as may be provided by the terms of the appropriate plan,
program, practice or policy, the Company shall continue welfare and fringe
benefits to the Executive and/or the Executive's family at least equal to those
that would have been provided to them in accordance with the plans, programs,
practices and policies described in Section 3(b)(4) and (6) if the Executive's
employment had not been terminated or, if more favorable to the Executive, as in

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effect generally at any time thereafter with respect to other peer executives of
the Company and the Affiliated Companies and their families, provided, however,
that, if the Executive becomes reemployed with another employer and is eligible
to receive medical or other welfare benefits under another employer provided
plan, the medical and other welfare benefits described herein shall be secondary
to those provided under such other plan during such applicable period of
eligibility; and for purposes of determining eligibility (but not the time of
commencement of benefits) of the Executive for retiree benefits pursuant to such
plans, practices, programs and policies, the Executive shall be considered to
have remained employed until three years after the Date of Termination and to
have retired on the last day of such period;

               (3) the Company shall, at its sole expense as incurred, provide
the Executive with outplacement services the scope and provider of which shall
be selected by the Executive in the Executive's sole discretion provided, that
the cost of such outplacement shall not exceed $50,000;

               (4) all stock options and restricted stock held by the Executive
immediately before the Date of Termination shall vest in full, and such stock
options shall remain exercisable until the first to occur of the first
anniversary of the Date of Termination and the expiration of their original
terms (unless the option by its terms provides for a longer period of continued
exercisability); and

               (5) to the extent not theretofore paid or provided, the Company
shall timely pay or provide to the Executive any other amounts or benefits
required to be paid or provided or that the Executive is eligible to receive
under any plan, program, policy or practice or contract or agreement of the
Company and the Affiliated Companies (such other amounts and benefits, the
"Other Benefits").

               (b) DEATH. If the Executive's employment is terminated by reason
of the Executive's death during the Employment Period but after the Executive
has given a Notice of Termination for Good Reason or the Company has given a
Notice of Termination other than for Cause, such termination shall be treated as
a termination by the Executive for Good Reason and the Executive's estate and/or
beneficiaries shall be entitled to the benefits provided for in Section 5(a)
above, other than Section 5(a)(3). If the Executive's employment is terminated
by reason of the Executive's death during the Employment Period other than as
described in the preceding sentence, the Company shall provide the Executive's
estate or beneficiaries with the Accrued Obligations and the timely payment or
delivery of the Other Benefits, and shall have no other severance obligations
under this Agreement. The Accrued Obligations shall be paid to the Executive's
estate or beneficiary, as applicable, in a lump sum in cash within 30 days of
the Date of Termination. With respect to the provision of the Other Benefits,
the term "Other Benefits" as utilized in this Section 5(b) shall include,
without limitation, and the Executive's estate and/or beneficiaries shall be
entitled to receive, benefits at least equal to the most favorable benefits
provided by the Company and the Affiliated Companies to the estates and
beneficiaries of peer executives of the Company and the Affiliated Companies
under such plans, programs, practices and policies relating to death benefits,
if any, as in effect with respect to other peer executives and their
beneficiaries at any time during the 120-day period immediately preceding the
Effective Date or, if more favorable to the Executive's estate and/or the
Executive's

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beneficiaries, as in effect on the date of the Executive's death with respect to
other peer executives of the Company and the Affiliated Companies and their
beneficiaries.

               (c) DISABILITY. If the Executive's employment is terminated by
reason of the Executive's Disability during the Employment Period but after the
Executive has given a Notice of Termination for Good Reason or the Company has
given a Notice of Termination other than for Cause, such termination shall be
treated as a termination by the Executive for Good Reason and the Executive
shall be entitled to the benefits provided for in Section 5(a) above, other than
Section 5(a)(3). If the Executive's employment is terminated by reason of the
Executive's Disability during the Employment Period other than as described in
the preceding sentence, the Company shall provide the Executive with the Accrued
Obligations and the timely payment or delivery of the Other Benefits, and shall
have no other severance obligations under this Agreement. The Accrued
Obligations shall be paid to the Executive in a lump sum in cash within 30 days
of the Date of Termination. With respect to the provision of the Other Benefits,
the term "Other Benefits" as utilized in this Section 6(c) shall include, and
the Executive shall be entitled after the Disability Effective Date to receive,
disability and other benefits at least equal to the most favorable of those
generally provided by the Company and the Affiliated Companies to disabled
executives and/or their families in accordance with such plans, programs,
practices and policies relating to disability, if any, as in effect generally
with respect to other peer executives and their families at any time during the
120-day period immediately preceding the Effective Date or, if more favorable to
the Executive and/or the Executive's family, as in effect at any time thereafter
generally with respect to other peer executives of the Company and the
Affiliated Companies and their families.

               (d) CAUSE; OTHER THAN FOR GOOD REASON. If the Executive's
employment is terminated for Cause during the Employment Period, the Company
shall provide to the Executive (1) the Executive's Annual Base Salary through
the Date of Termination, (2) the amount of any compensation previously deferred
by the Executive, and (3) the Other Benefits, in each case, to the extent
theretofore unpaid, and shall have no other severance obligations under this
Agreement. If the Executive voluntarily terminates employment during the
Employment Period, excluding a termination for Good Reason, the Company shall
provide to the Executive the Accrued Obligations and the timely payment or
delivery of the Other Benefits, and shall have no other severance obligations
under this Agreement. In such case, all the Accrued Obligations shall be paid to
the Executive in a lump sum in cash within 30 days of the Date of Termination.

SECTION 6. NON-EXCLUSIVITY OF RIGHTS. Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any plan, program,
policy or practice provided by the Company or the Affiliated Companies and for
which the Executive may qualify, nor, subject to Section 11(f), shall anything
herein limit or otherwise affect such rights as the Executive may have under any
other contract or agreement with the Company or the Affiliated Companies.
Amounts that are vested benefits or that the Executive is otherwise entitled to
receive under any plan, policy, practice or program of or any contract or
agreement with the Company or the Affiliated Companies at or subsequent to the
Date of Termination shall be payable in accordance with such plan, policy,
practice or program or contract or agreement, except as explicitly modified by
this Agreement. Notwithstanding the foregoing, if the Executive receives
payments and benefits pursuant to Section 5(a) of this Agreement, the Executive
shall not be entitled to any severance pay or benefits under any severance plan,

                                       10
<PAGE>   11
program or policy of the Company and the Affiliated Companies, including without
limitation the Executive Severance Plan, unless otherwise specifically provided
therein in a specific reference to this Agreement.

SECTION 7.        FULL SETTLEMENT; CONTESTS.

               (a) The Company's obligation to make the payments provided for in
this Agreement and otherwise to perform its obligations hereunder shall not be
affected by any set-off, counterclaim, recoupment, defense, or other claim,
right or action that the Company may have against the Executive or others. In no
event shall the Executive be obligated to seek other employment or take any
other action by way of mitigation of the amounts payable to the Executive under
any of the provisions of this Agreement, and such amounts shall not be reduced
whether or not the Executive obtains other employment.

               (b) The Company agrees to pay as incurred (within 10 days
following the Company's receipt of an invoice from the Executive), to the full
extent permitted by law, all legal fees and expenses that the Executive may
reasonably incur as a result of any contest (regardless of the outcome thereof)
by the Company, the Executive or others of the validity or enforceability of, or
liability under, any provision of this Agreement or any guarantee of performance
thereof (including as a result of any contest by the Executive about the amount
of any payment pursuant to this Agreement), plus, in each case, interest on any
delayed payment at the applicable federal rate provided for in Section
7872(f)(2)(A) of the Internal Revenue Code of 1986, as amended (the "Code").
Notwithstanding the foregoing, the Company shall have no obligation to pay the
Executive's legal fees and expenses in connection with any action initiated by
the Executive as to which the trier of fact finds that the Executive's claim was
frivolous or brought in bad faith.

SECTION 8.        CERTAIN ADDITIONAL PAYMENTS BY THE COMPANY.

               (a) Anything in this Agreement to the contrary notwithstanding,
in the event it shall be determined that any payment or distribution in the
nature of compensation (within the meaning of Section 280G(b)(2) of the Code) to
or for the benefit of the Executive, whether paid or payable pursuant to this
Agreement or otherwise (a "Payment"), would be subject to the excise tax imposed
by Section 4999 of the Code, together with any interest or penalties imposed
with respect to such excise tax (the "Excise Tax"), then the Executive shall be
entitled to receive an additional payment (the "Gross-Up Payment") in an amount
such that, after payment by the Executive of all taxes (and any interest or
penalties imposed with respect to such taxes), including, without limitation,
any income taxes (and any interest and penalties imposed with respect thereto)
and Excise Tax imposed upon the Gross-Up Payment, the Executive retains an
amount of the Gross-Up Payment equal to the Excise Tax imposed upon the
Payments.

               (b) Subject to the provisions of Section 8(c), all determinations
required to be made under this Section 8, including whether and when a Gross-Up
Payment is required, the amount of such Gross-Up Payment and the assumptions to
be utilized in arriving at such determination, shall be made by
PriceWaterhouseCoopers (the "Accounting Firm"). The Accounting Firm shall
provide detailed supporting calculations both to the Company and the Executive
within 15 business days of the receipt of notice from the Executive that there
has been

                                       11
<PAGE>   12
a Payment or such earlier time as is requested by the Company. In the event that
the Accounting Firm is serving as accountant or auditor for the individual,
entity or group effecting the Change of Control, the Executive may appoint
another nationally recognized accounting firm to make the determinations
required hereunder (which accounting firm shall then be referred to as the
Accounting Firm hereunder). All fees and expenses of the Accounting Firm shall
be borne solely by the Company. Any Gross-Up Payment, as determined pursuant to
this Section 8, shall be paid by the Company to the Executive within 5 days of
the receipt of the Accounting Firm's determination. Any determination by the
Accounting Firm shall be binding upon the Company and the Executive. As a result
of the uncertainty in the application of Section 4999 of the Code at the time of
the initial determination by the Accounting Firm hereunder, it is possible that
Gross-Up Payments that will not have been made by the Company should have been
made (the "Underpayment"), consistent with the calculations required to be made
hereunder. In the event the Company exhausts its remedies pursuant to Section
8(c) and the Executive thereafter is required to make a payment of any Excise
Tax, the Accounting Firm shall determine the amount of the Underpayment that has
occurred and any such Underpayment shall be promptly paid by the Company to or
for the benefit of the Executive.

               (c) The Executive shall notify the Company in writing of any
claim by the Internal Revenue Service that, if successful, would require the
payment by the Company of the Gross-Up Payment. Such notification shall be given
as soon as practicable, but no later than 10 business days after the Executive
is informed in writing of such claim. The Executive shall apprise the Company of
the nature of such claim and the date on which such claim is requested to be
paid. The Executive shall not pay such claim prior to the expiration of the
30-day period following the date on which the Executive gives such notice to the
Company (or such shorter period ending on the date that any payment of taxes
with respect to such claim is due). If the Company notifies the Executive in
writing prior to the expiration of such period that the Company desires to
contest such claim, the Executive shall:

               (1) give the Company any information reasonably requested by the
Company relating to such claim,

               (2) take such action in connection with contesting such claim as
the Company shall reasonably request in writing from time to time, including,
without limitation, accepting legal representation with respect to such claim by
an attorney reasonably selected by the Company,

               (3) cooperate with the Company in good faith in order effectively
to contest such claim, and

               (4) permit the Company to participate in any proceedings relating
to such claim;

provided, however, that the Company shall bear and pay directly all costs and
expenses (including additional interest and penalties) incurred in connection
with such contest, and shall indemnify and hold the Executive harmless, on an
after-tax basis, for any Excise Tax or income tax (including interest and
penalties) imposed as a result of such representation and payment of costs and
expenses. Without limitation on the foregoing provisions of this Section 8(c),
the

                                       12
<PAGE>   13
Company shall control all proceedings taken in connection with such contest,
and, at its sole discretion, may pursue or forgo any and all administrative
appeals, proceedings, hearings and conferences with the applicable taxing
authority in respect of such claim and may, at its sole discretion, either
direct the Executive to pay the tax claimed and sue for a refund or contest the
claim in any permissible manner, and the Executive agrees to prosecute such
contest to a determination before any administrative tribunal, in a court of
initial jurisdiction and in one or more appellate courts, as the Company shall
determine; provided, however, that, if the Company directs the Executive to pay
such claim and sue for a refund, the Company shall advance the amount of such
payment to the Executive, on an interest-free basis, and shall indemnify and
hold the Executive harmless, on an after-tax basis, from any Excise Tax or
income tax (including interest or penalties) imposed with respect to such
advance or with respect to any imputed income in connection with such advance;
and provided, further, that any extension of the statute of limitations relating
to payment of taxes for the taxable year of the Executive with respect to which
such contested amount is claimed to be due is limited solely to such contested
amount. Furthermore, the Company's control of the contest shall be limited to
issues with respect to which the Gross-Up Payment would be payable hereunder,
and the Executive shall be entitled to settle or contest, as the case may be,
any other issue raised by the Internal Revenue Service or any other taxing
authority.

               (d) If, after the receipt by the Executive of an amount advanced
by the Company pursuant to Section 8(c), the Executive becomes entitled to
receive any refund with respect to such claim, the Executive shall (subject to
the Company's complying with the requirements of Section 8(c)) promptly pay to
the Company the amount of such refund (together with any interest paid or
credited thereon after taxes applicable thereto). If, after the receipt by the
Executive of an amount advanced by the Company pursuant to Section 8(c), a
determination is made that the Executive shall not be entitled to any refund
with respect to such claim and the Company does not notify the Executive in
writing of its intent to contest such denial of refund prior to the expiration
of 30 days after such determination, then such advance shall be forgiven and
shall not be required to be repaid and the amount of such advance shall offset,
to the extent thereof, the amount of Gross-Up Payment required to be paid.

               (e) Notwithstanding any other provision of this Section 8, the
Company may, in its sole discretion, withhold and pay over to the Internal
Revenue Service or any other applicable taxing authority, for the benefit of the
Executive, all or any portion of the Gross-Up Payment, and the Executive hereby
consents to such withholding.

SECTION 9. CONFIDENTIAL INFORMATION. The Executive shall hold in a fiduciary
capacity for the benefit of the Company all secret or confidential information,
knowledge or data relating to the Company or the Affiliated Companies, and their
respective businesses, which information, knowledge or data shall have been
obtained by the Executive during the Executive's employment by the Company or
the Affiliated Companies and which information, knowledge or data shall not be
or become public knowledge (other than by acts by the Executive or
representatives of the Executive in violation of this Agreement). After
termination of the Executive's employment with the Company, the Executive shall
not, without the prior written consent of the Company or as may otherwise be
required by law or legal process, communicate or divulge any such information,
knowledge or data to anyone other than the Company and those persons designated
by the Company. In no event shall an asserted violation of the provisions of

                                       13
<PAGE>   14
this Section 9 constitute a basis for deferring or withholding any amounts
otherwise payable to the Executive under this Agreement.

SECTION 10.       SUCCESSORS.

               (a) This Agreement is personal to the Executive, and, without the
prior written consent of the Company, shall not be assignable by the Executive
other than by will or the laws of descent and distribution. This Agreement shall
inure to the benefit of and be enforceable by the Executive's legal
representatives.

               (b) This Agreement shall inure to the benefit of and be binding
upon the Company and its successors and assigns. Except as provided in Section
10(c), without the prior written consent of the Executive this Agreement shall
not be assignable by the Company.

               (c) The Company will require any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to assume
expressly and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place. "Company" means the Company as hereinbefore defined and any
successor to its business and/or assets as aforesaid that assumes and agrees to
perform this Agreement by operation of law or otherwise.

SECTION 11.       MISCELLANEOUS.

               (a) This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, without reference to
principles of conflict of laws. The captions of this Agreement are not part of
the provisions hereof and shall have no force or effect. This Agreement may not
be amended or modified other than by a written agreement executed by the parties
hereto or their respective successors and legal representatives.

               (b) All notices and other communications hereunder shall be in
writing and shall be given by hand delivery to the other party or by registered
or certified mail, return receipt requested, postage prepaid, addressed as
follows:

                  if to the Executive:

                  Fred G. Aanonsen
                  Hercules Incorporated
                  Hercules Plaza
                  Wilmington, Delaware 19894-0001

                  if to the Company:

                  Hercules Incorporated
                  Hercules Plaza
                  Wilmington, Delaware 19894-0001

                  Attn: Chief Executive Officer

                                       14
<PAGE>   15
or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notice and communications shall be effective
when actually received by the addressee.

               (c) The invalidity or unenforceability of any provision of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement.

               (d) The Company may withhold from any amounts payable under this
Agreement such United States federal, state or local or foreign taxes as shall
be required to be withheld pursuant to any applicable law or regulation.

               (e) The Executive's or the Company's failure to insist upon
strict compliance with any provision of this Agreement or the failure to assert
any right the Executive or the Company may have hereunder, including, without
limitation, the right of the Executive to terminate employment for Good Reason
pursuant to Sections 4(c)(1) through 4(c)(5), shall not be deemed to be a waiver
of such provision or right or any other provision or right of this Agreement.

               (f)

                                       15
<PAGE>   16
                       THIS PAGE INTENTIONALLY LEFT BLANK

                                       16
<PAGE>   17
               IN WITNESS WHEREOF, the Executive has hereunto set the
Executive's hand and, pursuant to the authorization from the Board, the Company
has caused these presents to be executed in its name on its behalf, all as of
the day and year first above written.

                                  /s/Fred G. Aanonsen
                                 _______________________________________________
                                     Fred G. Aanonsen

                                 HERCULES INCORPORATED

                                 By /s/ William H. Joyce
                                   _____________________________________________
                                        William H. Joyce
                                        Chairman and Chief Executive Officer

Attest:

Israel J. Floyd
__________________________________
Israel J. Floyd

                                       17<PAGE>   1

                                                                   Exhibit 10.29

                                FOURTH AMENDMENT
                                       TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

         THIS FOURTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this
"Amendment"), dated as of July 17, 2001, is entered into by and among HERCULES
INCORPORATED, a Delaware corporation (the "Company"), BETZDEARBORN CANADA, INC.,
an Ontario corporation (the "Canadian Borrower"), certain subsidiaries of the
Company identified on the signature pages hereto (the "Subsidiary Guarantors"),
the several banks and other financial institutions identified on the signature
pages hereto, BANK OF AMERICA, N.A., as administrative agent (the
"Administrative Agent") and BANK OF AMERICA CANADA, as Canadian administrative
agent (the "Canadian Administrative Agent"). Except as otherwise defined in this
Amendment, terms defined in the Credit Agreement referred to below (as amended
by this Amendment) are used herein as defined therein.

                                    RECITALS

         A. The Company, the Canadian Borrower, the Subsidiary Guarantors party
thereto, the Lenders party thereto, the Administrative Agent and the Canadian
Administrative Agent entered into that certain Amended and Restated Credit
Agreement dated as of April 19, 1999 (as amended by that First Amendment to
Amended and Restated Credit Agreement dated as of March 31, 2000, as amended by
that Second Amendment to Amended and Restated Credit Agreement dated as of July
26, 2000 and as further amended by that Third Amendment to Amended and Restated
Credit Agreement dated as of November 14, 2000, and as may be further amended,
restated, modified or supplemented from time to time, the "Credit Agreement").

         B. The Company has requested certain modifications to the Credit
Agreement.

         C. Such modifications require the consent of the Required Lenders.

         D. The Required Lenders have consented to the requested modifications
on the terms and conditions set forth herein.

                                    AGREEMENT

         NOW, THEREFORE, IN CONSIDERATION of the premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:
<PAGE>   2
I.       AMENDMENTS TO CREDIT AGREEMENT

         Subject to the satisfaction of the conditions precedent set forth in
Section 5 in Article II hereof, from and after the Fourth Amendment Effective
Date (as defined below), the Credit Agreement in the following respects:

     1.   Section 5.2(d)(i) of the Credit Agreement is hereby deleted in its
          entirety and the following substituted therefor:

               (i) Leverage Ratio. It will not permit, as of the last day of any
          fiscal quarter, the Leverage Ratio to exceed the ratio set forth below
          for the applicable period:

<TABLE>
<CAPTION>
                     Period                               Maximum Leverage Ratio
<S>       <C>                                             <C>
          Closing Date through March 31, 1999                   5.0 to 1.0
          April 1, 1999 through September 30, 1999              4.5 to 1.0
          October 1, 1999 through March 31, 2000                3.5 to 1.0
          April 1, 2000 through June 30, 2000                   3.75 to 1.0
          July 1, 2000 through September 30, 2000               3.5 to 1.0
          October 1, 2000 through June 30, 2001                 4.75 to 1.0
          July 1, 2001 through September 30, 2001               5.25 to 1.0
          October 1, 2001 through December 31, 2001             5.00 to 1.0
          January 1, 2002 through March 31, 2002                4.75 to 1.0
          April 1, 2002 through June 30, 2002                   4.50 to 1.0
          July 1, 2002 and thereafter                           4.25 to 1.0
</TABLE>

     2.   Section 5.2(d)(iii) of the Credit Agreement is hereby deleted in its
          entirety and the following substituted therefor:

          (iii) Interest Coverage Ratio. It will not permit, as of the last day
               of any fiscal quarter, the Interest Coverage Ratio to be less
               than the ratio set forth below for the applicable period:

<TABLE>
<CAPTION>
                                                             Minimum Interest
                   Period                                     Coverage Ratio
<S>       <C>                                                <C>
          Closing Date through September 30, 1999              2.5 to 1.0
          October 1, 1999 through September 30, 2000           3.0 to 1.0
          October 1, 2000 through June 30, 2001                1.75 to 1.0
          July 1, 2001 through September 30, 2001              1.65 to 1.0
          October 1, 2001 through December 31, 2001            1.75 to 1.0
          January 1, 2002 and thereafter                       2.00 to 1.0
</TABLE>

     3.   The definition of "Asset Disposition" in Section 7 of the Credit
          Agreement is hereby deleted in its entirety and the following
          substituted therefor:

                                       2
<PAGE>   3
                    "Asset Disposition": the disposition of any or all of the
               assets (including without limitation the Capital Stock of a
               Subsidiary) of the Company or any of its Subsidiaries whether by
               sale, lease, transfer or otherwise (including a disposition
               pursuant to any casualty or condemnation event, but excluding a
               disposition pursuant to a Permitted Receivables Financing). The
               term "Asset Disposition" shall not include (i) the sale of
               inventory in the ordinary course of business, (ii) the sale or
               disposition of machinery and equipment no longer used or useful
               in the conduct of such Person's business, (iii) any Equity
               Issuance by the Company, (iv) intercompany transfers from a
               Credit Party or a wholly-owned Subsidiary of a Credit Party to a
               Credit Party, (v) intercompany transfers from any wholly-owned
               Subsidiary of a Credit Party (which Subsidiary is not itself a
               Credit Party or a First Tier Foreign Subsidiary) to any
               wholly-owned Subsidiary of a Credit Party; or (vi) intercompany
               transfers from a First Tier Foreign Subsidiary to another First
               Tier Foreign Subsidiary as long as the Company can demonstrate
               pursuant to documentation reasonably satisfactory to the
               Collateral Agent that the Collateral Agent's security interest in
               the Pledged Stock of such First Tier Foreign Subsidiary receiving
               the assets is as perfected as the Collateral Agent's security
               interest in the prior First Tier Foreign Subsidiary.

          4.   The definition of "Consolidated Net Worth" in Section 7 of the
               Credit Agreement is hereby deleted in its entirety and the
               following substituted therefor:

                    "Consolidated Net Worth": as of the end of the most recently
               ended calendar month, the sum of (i) all items that would be
               included under stockholders' equity on a consolidated balance
               sheet of the Company and its Consolidated Subsidiaries plus (ii)
               insurance reserves. Consolidated Net Worth shall be determined in
               accordance with generally accepted accounting principles
               substantially the same as those used by the Company in preparing
               the financial statements referred to in subsection 1.2 and on a
               consolidated basis substantially the same as that used by the
               Company in preparing such financial statements; provided,
               however, that neither (A) foreign currency translation
               adjustments under Financial Accounting Standards Board Statement
               No. 52, "Foreign Currency Translation" (B) items reported in
               comprehensive income and accumulated other comprehensive income
               under Financial Accounting Standards Board Statement No. 130
               (including but not limited to gains or losses for derivatives
               designated as a hedge of exposure to variable cash flows of
               forecasted transactions and derivatives designated as a hedge of
               foreign currency exposure of a net investment in a foreign
               operation) nor (C) items and charges related to the impairment of
               goodwill in connection with the Acquisition to the extent, in the
               amount and only for so long as required by generally accepted
               accounting principles, shall in any case be taken into account in
               calculating Consolidated Net Worth.

          5.   The definition of Consolidated EBITDA in Section 7 of the Credit
               Agreement is hereby deleted in its entirety and the following
               substituted therefor:

                                       3
<PAGE>   4
                    "Consolidated EBITDA": for any fiscal period, (i)
               Consolidated Net Income for such period, plus (ii) Consolidated
               Interest Expense for such period, plus (iii) to the extent
               deducted in computing such Consolidated Net Income, the sum of
               (a) taxes, (b) depreciation, (c) amortization, (d) any non-cash
               charges, (e) for the fiscal quarter ended June 30, 2001 through
               the fiscal quarter ended June 30, 2002 only, any non-recurring
               cash charges associated with the restructuring of the Company and
               its Subsidiaries initiated on or after April 1, 2001 in an
               aggregate amount not to exceed $50,000,000 and (f) any
               extraordinary, unusual or non-recurring cash losses or cash
               charges incurred in connection with (x) the Acquisition in an
               amount not to exceed $170 million after taxes in the aggregate
               for all such add-backs pursuant to this subclause (x) and (y) the
               settlement prior to the Closing Date of certain litigation in an
               amount not to exceed $63 million after taxes in the aggregate for
               all such add-backs pursuant to this subclause (y), minus (iv) any
               extraordinary gains and noncash gains.

II.      MISCELLANEOUS

     1. Representations and Warranties. Each of the Credit Parties represents
and warrants to the Lenders, the Administrative Agent and the Canadian
Administrative Agent as follows:

          (i) It has taken all necessary action to authorize the execution,
     delivery and performance of this Amendment.

          (ii) This Amendment has been duly executed and delivered by such
     Credit Party and constitutes such Credit Party's legal, valid and binding
     obligation, enforceable in accordance with its terms, except as such
     enforceability may be limited (x) by general principles of equity and
     conflicts of laws or (y) by bankruptcy, reorganization, insolvency,
     moratorium or other laws of general application relating to or affecting
     the enforcement of creditors' rights.

          (iii) No consent, approval, authorization or order of, or filing,
     registration or qualification with, any court or governmental authority or
     third party is required in connection with the execution, delivery or
     performance by such Credit Party of this Amendment.

          (iv) The execution and delivery of this Amendment does not diminish or
     reduce its obligations under the Credit Documents (including, without
     limitation, in the case of each Guarantor, such Guarantor's guaranty
     pursuant to Section 3A of the Credit Agreement) in any manner, except as
     specifically set forth herein.

          (v) Such Credit Party has no claims, counterclaims, offsets, or
     defenses to the Credit Documents and the performance of its obligations
     thereunder, or if such Credit Party has any such claims, counterclaims,
     offsets, or defenses to the Credit Documents or any transaction related to
     the Credit Documents, the same are hereby waived,

                                       4
<PAGE>   5
     relinquished and released in consideration of the Required Lenders'
     execution and delivery of this Amendment.

          (vi) The representations and warranties of the Credit Parties set
     forth in Section 1 of the Credit Agreement are true and correct as of the
     date hereof (except those that expressly relate to an earlier date) and all
     of the provisions of the Credit Documents, except as amended hereby, are in
     full force and effect.

          (vii) Subsequent to the execution and delivery of this Amendment and
     after giving effect hereto, no unwaived event has occurred and is
     continuing which constitutes a Default or an Event of Default.

     2. Liens. Each Credit Party affirms the liens and security interests
created and granted by it in the Credit Documents (including, but not limited
to, the Pledge Agreement, the Security Agreement and the Mortgages) and agrees
that this Amendment shall in no manner adversely affect or impair such liens and
security interests.

     3. Effect of Amendment. Except as expressly modified and amended in this
Amendment, all of the terms, provisions and conditions of the Credit Documents
shall remain unchanged and in full force and effect. The Credit Documents and
any and all other documents heretofore, now or hereafter executed and delivered
pursuant to the terms of the Credit Agreement are hereby amended so that any
reference to the Credit Agreement shall mean a reference to the Credit Agreement
as amended hereby.

     4. Expenses. The Company agrees to pay all reasonable costs and expenses
incurred in connection with the preparation, execution and delivery of this
Amendment, including the reasonable fees and expenses of the Administrative
Agent's legal counsel.

     5. Conditions Precedent. This Amendment shall become effective on the day
(the "Fourth Amendment Effective Date") on which each of the following
conditions precedent has been satisfied:

          (a) the Administrative Agent shall have received counterparts of this
     Amendment, duly executed and delivered by each of the Credit Parties, the
     Required Lenders and by the Administrative Agent and the Canadian
     Administrative Agent.

          (b) the Administrative Agent shall have received from a Responsible
     Officer of the Company a certificate to the effect that as of the date
     hereof and as of the Fourth Amendment Effective Date all representations
     and warranties made by the Company and each other Credit Party in this
     Amendment and each other Credit Document are true and correct in all
     material respects;

          (c) no Default or Event of Default shall have occurred and be
     continuing; and

          (d) each Lender party to the Credit Agreement who executes this
     Amendment on or before 5:00 P.M. Eastern Standard Time on July 11, 2001
     (provided this

                                       5
<PAGE>   6
     Amendment is approved by the Required Lenders) shall have received an
     amendment fee equal to 0.10% of the sum of each Lender's Commitment
     Percentage.

     6. Counterparts. This Amendment may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed and delivered shall be deemed to be an original and all of
which taken together shall constitute one and the same instrument.

     7. Governing Law. This Amendment shall be governed by and construed in
accordance with the laws of the State of North Carolina.

     8. ENTIRETY. THIS AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER CREDIT
DOCUMENTS EMBODY THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND SUPERSEDE ALL
PRIOR AGREEMENTS AND UNDERSTANDINGS, IF ANY, RELATING TO THE SUBJECT MATTER
HEREOF. THESE CREDIT DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES
AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES.

                                       6
<PAGE>   7
         IN WITNESS WHEREOF, the parties hereto have caused this Amendment, to
be duly executed and delivered by their proper and duly authorized officers as
of the day and year first above written.

THE COMPANY:                        HERCULES INCORPORATED,

                                    a Delaware corporation

                                    By:
                                       _________________________________________
                                    Name:
                                         _______________________________________
                                    Title:
                                         _______________________________________

CANADIAN
BORROWER:                           BETZDEARBORN CANADA, INC.,

                                    an Ontario corporation

                                    By:
                                       _________________________________________
                                    Name:
                                         _______________________________________
                                    Title:
                                          ______________________________________
<PAGE>   8
OTHER SUBSIDIARY
GUARANTORS:

                                          HERCULES CREDIT, INC.,
                                              a Delaware corporation

                                          HERCULES FLAVOR, INC.,
                                              a Delaware corporation

                                          WSP, INC.,
                                              a Delaware corporation

                                          AQUALON COMPANY,
                                              a Delaware partnership

                                          HERCULES FINANCE COMPANY,
                                              a Delaware partnership

                                          FIBERVISIONS, L.L.C.,
                                              a Delaware limited liability
                                                company

                                          FIBERVISIONS INCORPORATED,
                                              a Delaware corporation

                                          FIBERVISIONS PRODUCTS, INC.,
                                              a Georgia corporation

                                          HERCULES INTERNATIONAL LIMITED,
                                              a Delaware corporation

                                          BETZDEARBORN INC.,
                                              a Pennsylvania corporation

                                          BETZDEARBORN EUROPE, INC.,
                                              a Delaware corporation

                                          D R C LTD.,
                                              a Delaware corporation

                                          BL TECHNOLOGIES, INC.,
                                              a Delaware corporation

                                          BLI HOLDINGS CORP.,
                                              a Delaware corporation

                                          HERCULES SHARED SERVICES CORPORATION,
                                              a Delaware corporation

                                          BETZDEARBORN INTERNATIONAL, INC.,
                                              a Pennsylvania corporation

                                          ATHENS HOLDINGS, INC.,
                                              a Delaware corporation

                                          BETZDEARBORN CHINA, LTD.,
                                              a Delaware corporation

                                          BL CHEMICALS INC.,
                                              a Delaware corporation

                                          CHEMICAL TECHNOLOGIES INDIA, LTD.,
                                              a Delaware corporation

                           [signature pages continue]
<PAGE>   9
                                         COVINGTON HOLDINGS, INC.,
                                             a Delaware corporation

                                         EAST BAY REALTY SERVICES, INC.,
                                             a Delaware corporation

                                         FIBERVISIONS, L.P.,
                                             a Delaware partnership

                                         HERCULES CHEMICAL CORPORATION,
                                             a Delaware corporation

                                         HERCULES COUNTRY CLUB, INC.,
                                             a Delaware corporation

                                         HERCULES EURO HOLDINGS, LLC,
                                             a Delaware limited liability
                                               company

                                         HERCULES INTERNATIONAL LIMITED, L.L.C.,
                                             a Delaware limited liability
                                               company

                                         HERCULES INVESTMENTS, L.L.C.,
                                             a Delaware limited liability
                                               company

                                         HISPAN CORPORATION,
                                             a Delaware corporation

                                         By:
                                            _________________________________
                                         Name:
                                              _______________________________
                                         Title:
                                               ______________________________
                                                  for each of the foregoing
<PAGE>   10
ADMINISTRATIVE
AGENT:                              BANK OF AMERICA, N.A.,
                                    in its capacity as Administrative Agent and
                                    as a Lender

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

CANADIAN                            BANK OF AMERICA CANADA,
ADMINISTRATIVE AGENT:               as Canadian Administrative Agent

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________
<PAGE>   11
LENDERS:                            ____________________________________________
                                                 [NAME OF LENDER]

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________
<PAGE>   12
TRANCHE D
LENDER:                             ______________________________

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}]]