WILMINGTON, DE, JUNE 13, 2008 . . . Hercules Incorporated (NYSE: HPC) today announced the following schedule and teleconference information for its second quarter earnings release and teleconference:

Earnings Release: July 21, 2008 – After the stock market closes.

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

Teleconference: July 22, 2008 — 10:00 a.m. (Eastern).

Dial in Number: 973-935-8511 – Ask for Conference ID # 52211131
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 July 22, 2008 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.