WILMINGTON, DE, JANUARY 16, 2007 . . . Hercules Incorporated (NYSE: HPC) today announced the following schedule and teleconference information for its fourth quarter earnings release and teleconference:

Earnings Release: January 31, 2007 – After the stock market closes.

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

Teleconference: February 1, 2007 — 9:00 a.m. (Eastern).

Dial in Number: 973-935-8756 — Ask for Conference ID # 8340785
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 beginning at noon on February 1, 2007
on the web at www.herc.com, under Shareholder Information.

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