2008-04-03 23:19:53 -

www.herc.com/ - Hercules Incorporated (NYSE:HPC) today announced the following schedule and teleconference information for its first quarter earnings release and teleconference: -0- Earnings Release: April 21, 2008 - After the stock market closes. Distribution: Business Wire and Hercules' website at www.herc.com. Teleconference: April 22, 2008 -- 8:00 a.m. (Eastern). Dial in Number: 973-935-8511 - Ask for Conference

ID # 42401160 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 April 22, 2008 on the web at www.herc.com, under Shareholder Information.

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.

Hercules Incorporated
Media Contact:
John S. Riley, 302-594-6025
or
Investor Contact:
Stuart L. Fornoff, 302-594-7151