WILMINGTON, DE, OCTOBER 6, 2006 . . . Hercules Incorporated (NYSE: HPC) today announced that due to scheduling conflicts with other peer companies, the time for the third quarter 2006 earnings teleconference has been changed FROM 9:00 a.m. TO 8:00 a.m., (Eastern) on October 24th, with the distribution of the earnings news release after the market closes on October 23rd.

Earnings Release: October 23, 2006 – After trading ends on the
New York Stock Exchange..

Distribution: By Business Wire and Hercules' website at www.herc.com.

Teleconference: October 24, 2006 — 8:00 a.m. (Eastern)

Dial in Number: 973-582-2854 — Ask for Conference ID #7917551
Please call 5-10 minutes before the scheduled start of the teleconference.

Webcast: Listen-only mode via Internet broadcast from Hercules
website at www.herc.com, under Shareholder Information.

Web Replay: Will be available by noon on October 24, 2006
on the web at www.herc.com, under Shareholder Information.

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Hercules manufactures and markets chemical specialties globally for making a variety of products for home, office and industrial markets. For more information, visit the Hercules website at www.herc.com.