CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Hercules Incorporated (the "Company")
on Form 10-Q for the period ending June 30, 2002 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), I, William H. Joyce,
Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002,
that:

(1) Except as set forth below, the Report fully complies with the requirements
of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material
respects, the financial condition and results of operations of the Company.

Pursuant to Securities and Exchange Commission Regulation S-X, Rule 3-10, the
Company is required to provide condensed consolidating financial information on
the Company and its subsidiaries in a prescribed format in all periodic reports
filed with the SEC. The preparation of the condensed consolidating financial
information is a complex process requiring substantial resources and the
information necessary to present all of the required disclosures was not
available in time to be included in the Report. The Company is in the process of
preparing the required condensed consolidating financial information and intends
to file a Form 10-Q/A, which will include this information, as soon as it is
available.

/s/        William H. Joyce


William H. Joyce
Chief Executive Officer
August 19, 2002