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.
--------------------------------------------------------------------------------
    (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.

      --------------------------------------------------------------------------
      (5)   TOTAL FEE PAID:  NOT APPLICABLE.

      --------------------------------------------------------------------------

[ ]  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.

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

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      (3)       FILING PARTY:  NOT APPLICABLE.

      --------------------------------------------------------------------------
      (4)       DATE FILED:  NOT APPLICABLE.

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                                                        FOR IMMEDIATE RELEASE
                                                        ---------------------
                                                        THURSDAY, MAY 17, 2001
                                                        ----------------------

                 ISP NOMINEES FOR HERCULES BOARD "DISAPPOINTED"
                 ----------------------------------------------
                            BY COMPANY'S REPORT TODAY
                            -------------------------

           WAYNE, NJ---A spokesperson for International Special Products Inc.'s
(NYSE: ISP) nominees for the Hercules Board commented today that the nominees
"are disappointed by the continued lack of any concrete progress with regard to
the Company's `sale process.'" ISP's four Director-nominees are up for election
by stockholders at the upcoming Annual Meeting of Hercules Incorporated (NYSE:
HPC) to be held at 10 a.m. next Thursday, May 24th at the Hercules Country Club,
500 Hercules Road, in Wilmington.

           The spokesperson said, "We are disappointed by the continued lack of
any concrete progress with regard to the Company's `sale process' as reflected
in the report provided by Hercules' executives in their conference call this
morning. Should Hercules stockholders elect our nominees to the Board next week,
we look forward to working with the other Hercules Directors in a constructive
fashion to move the process forward expeditiously in the best interest of all
stockholders."

                                    * * * * *

           International Specialty Products is a leading multinational
manufacturer of specialty chemicals and mineral products.

                                    * * * * *

           This press release may contain "forward-looking statements" within
the meaning of the federal securities laws and, as such, concerns matters that
are not historical facts. These statements are subject to risks and
uncertainties that could cause the actual results to differ materially from
those expressed in such statements.


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