Exhibit 23.21

                       CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the use in this Registration Statement on Form S-4 of
Hercules Incorporated of our report dated October 19, 2001 relating to the
financial statements of WSP, Inc. which appears in such Registration Statement.
We also consent to the reference to us under the heading "Experts" in such
Registration Statement.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania
October 26, 2001