SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 14A
                                 (RULE 14A-101)

                            SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

FILED BY THE REGISTRANT  [ ]

FILED BY A PARTY OTHER THAN THE REGISTRANT  [X]

CHECK THE APPROPRIATE BOX:

[ ]   PRELIMINARY PROXY STATEMENT
[ ]   DEFINITIVE PROXY STATEMENT            [ ]  CONFIDENTIAL, FOR USE OF THE
[X]   DEFINITIVE ADDITIONAL MATERIALS            COMMISSION ONLY (AS PERMITTED)
[ ]   SOLICITING MATERIAL PURSUANT TO            BY RULE 14A-6(E)(2)
      RULE 14A-12

                              HERCULES INCORPORATED
--------------------------------------------------------------------------------
                (NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


                      INTERNATIONAL SPECIALTY PRODUCTS INC.
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    (NAME OF PERSON(S) FILING PROXY STATEMENT, IF OTHER THAN THE REGISTRANT)



PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):

[X]  NO FEE REQUIRED.

[ ] FEE COMPUTED ON TABLE BELOW PER EXCHANGE ACT RULES 14A-6(I)(4) AND 0-11.

      (1)   TITLE OF EACH CLASS OF SECURITIES TO WHICH TRANSACTION APPLIES:
            NOT APPLICABLE

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      (2)   AGGREGATE NUMBER OF SECURITIES TO WHICH TRANSACTION APPLIES:  NOT
            APPLICABLE.

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      (3)   PER UNIT PRICE OR OTHER UNDERLYING VALUE OF TRANSACTION
            COMPUTED PURSUANT TO EXCHANGE ACT RULE 0-11 (SET FORTH THE
            AMOUNT ON WHICH THE FILING FEE IS CALCULATED AND STATE HOW
            IT WAS DETERMINED): NOT APPLICABLE.

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54104.0018

      (4)   PROPOSED MAXIMUM AGGREGATE VALUE OF TRANSACTION:  NOT APPLICABLE.

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      (5)   TOTAL FEE PAID:  NOT APPLICABLE.

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[ ]  FEE PAID PREVIOUSLY WITH PRELIMINARY MATERIALS:

[ ]  CHECK BOX IF ANY PART OF THE FEE IS OFFSET AS PROVIDED BY EXCHANGE
     ACT RULE 0-11(A)(2) AND IDENTIFY THE FILING FOR WHICH THE OFFSETTING
     FEE WAS PAID PREVIOUSLY. IDENTIFY THE PREVIOUS FILING BY REGISTRATION
     STATEMENT NUMBER, OR THE FORM OR SCHEDULE AND THE DATE OF ITS FILING.

      (1)       AMOUNT PREVIOUSLY PAID:  NOT APPLICABLE.

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      (2)       FORM, SCHEDULE OR REGISTRATION STATEMENT NO.:  NOT APPLICABLE.

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      (3)       FILING PARTY:  NOT APPLICABLE.

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      (4)       DATE FILED:  NOT APPLICABLE.

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                        INTERNATIONAL SPECIALTY PRODUCTS

                                                                 May 14, 2001


Dear Hercules Employee Plan Participant:

           While we are enclosing a letter of the same date addressed to all
Hercules stockholders, we wanted to address in this letter two issues of
importance to you as Hercules Employee Plan Participants.

           When we wrote to you on April 24th concerning the outrageously
extravagant compensation and perks doled out by the Hercules Board to a handful
of top executives, we had no idea as to how entrenched this practice has been at
Hercules. As illustration, a Hercules employee was recently kind enough to send
us a copy of an article from The Philadelphia Inquirer, entitled "SEC Requires
Firms to Report How Much Executives Earn, and Why" (August, 1998). The article
revealed the following FACTS concerning the executive compensation practices of
the Hercules Board, which apparently have been in place for years:

         o        In 1997, Hercules Chairman R. Keith Elliot collected more in
                  total compensation than any other executive at the 255
                  companies surveyed - $7.9 million, or a 740% increase over the
                  prior year!

         o        In 1997, the Company's top five executives collected a total
                  of $13 million in salary, bonuses and stock awards. The
                  Inquirer observed that this was "nearly twice what the
                  equivalent team was paid at Dupont - even though DuPont
                  revenues were 20 times greater than Hercules', and its profits
                  were 8 times larger."

         o        Hercules paid top officials "extra for their roles in
                  arranging mergers, divestitures or acquisitions" - AS IF THIS
                  WAS ABOVE AND BEYOND THE CALL OF DUTY! In accordance with that
                  practice, the Hercules Board paid Elliot a special $2.4
                  million stock payout for the sale of Hercules' aerospace unit
                  to Alliant in 1995.



         o        Hercules paid "hiring" bonuses to current executives in
                  connection with promotions. By way of example, the Company
                  granted its newly promoted President, Vincent Corbo, a
                  Hercules veteran, a $1.3 million stock award in connection
                  with his promotion.

           Top executives continue to this day to live off the "fat of the land"
thanks to the Hercules Board. While many of the remaining Hercules employees
fear for their jobs and have had their compensation either frozen or limited to
the most nominal of increases, the Companies' five highest paid executives last
year received average increases in their base compensation of 30%. And as a
Hercules stockholder, you have also had to contend with the disastrous
performance of the Company and its stock price and the elimination of your
dividend.

           On a final note, we have received a number of inquiries from current
and former Hercules Employees regarding the position of our nominees with regard
to health and pension benefits for employees and retirees. WE CAN ASSURE YOU
THAT, SHOULD WE BE ELECTED TO THE HERCULES BOARD, WE WILL INSIST THAT THE
COMPANY HONOR ALL BENEFIT PLANS COVERING ALL EMPLOYEES AND RETIREES, INCLUDING
PENSION AND HEALTH INSURANCE BENEFIT PLANS. MOREOVER, IN THE EVENT OF A FUTURE
SALE OR MERGER INVOLVING HERCULES, WE WOULD ONLY SUPPORT A TRANSACTION IN WHICH
THE PURCHASER AGREED TO HONOR THOSE BENEFIT PLANS AS WELL.

           If you are as upset as we are about what the Hercules Board has done
to our once great Company, we urge you to support our efforts on behalf of ALL
Hercules stockholders and help us work to secure a grand and glorious future for
the Company. PLEASE SIGN, DATE AND RETURN THE ENCLOSED BLUE PROXY CARD - TODAY!


                                   Sincerely,


/s/ Gloria Schaffer /s/ Raymond S. Troubh /s/ Sunil Kumar /s/ Samuel J. Heyman