The Arch Chemicals, Inc. Board of Directors on April 30, 2009 declared a
quarterly dividend of 20-cents on each share of Arch Chemicals
(NYSE:ARJ) common stock. The dividend is payable on June 15, 2009 to
shareholders of record at the close of business on May 15, 2009.
Headquartered in Norwalk, Connecticut (USA), Arch Chemicals, Inc. is a
global Biocides company with annual 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.

Arch Chemicals, Inc.
Investors:
Mark E. Faford, 203-229-2654
mefaford@archchemicals.com
or
Press:
Dale
N. Walter, 203-229-3033
dnwalter@archchemicals.com