Arch Chemicals, Inc. Declares Quarterly Dividend

The Arch Chemicals, Inc. Board of Directors on January 28, 2010 declared a quarterly dividend of 20-cents on each share of Arch Chemicals (NYSE:ARJ) common stock. The dividend is payable on March 16, 2010 to shareholders of record at the close of business on February 16, 2010.

Headquartered in Norwalk, Connecticut (USA), Arch Chemicals, Inc. is a global Biocides company with 2008 sales of approximately $1.5 billion. Arch and its subsidiaries provide innovative, chemistry-based solutions to control the growth of harmful microbes. The Company’s concentration is in water treatment, hair and skin care products, treated wood, preservation and protection applications such as for paints and building products and health and hygiene applications. Arch Chemicals operates in two segments: Treatment Products and Performance Products. Together with its subsidiaries, Arch has approximately 3,000 employees and manufacturing and customer-support facilities in North and South America, Europe, Asia, Australia and Africa.