Arch Chemicals Announces Global Price Increases for Biocides Used in Preservation & Protection and Health & Hygiene Applications.

NORWALK, Conn. -- Arch Chemicals, Inc. (NYSE:ARJ) has announced that to offset rising raw material, energy and packaging costs it is implementing price increases globally for biocides used in building products, marine antifouling paints, antidandruff shampoos, health and hygiene applications, metalworking fluids and plastics. In addition, Arch will implement fuel surcharges to address unprecedented increases in transportation costs.

The price increases are for both list and off-list prices and will become effective on or before July 1, 2008, or as contracts allow. Specific price increases and surcharges will vary by customer depending on the products purchased and their exposure to higher raw material, energy and shipping costs.

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, hair and skin care products, treated wood, paints and coatings, 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. For more information, visit the Company's Web site at http://www.archchemicals.com.

Except for historical information contained herein, the information set forth in this communication contains forward-looking statements that are based on management's beliefs, certain assumptions made by management and management's current expectations, outlook, estimates and projections about the markets and economy in which the Company and its various businesses operate. Words such as "anticipates," "believes," "estimates," "expects," "forecasts," "intends," "opines," "plans," "predicts," "projects," "should," "targets" and variations of such words and similar expressions are intended to identify such forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions ("Future Factors"), which are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expected or forecasted in such forward-looking statements. The Company undertakes no obligation to update publicly any forward-looking statements, whether as a result of future events, new information or otherwise. Future Factors which could cause actual results to differ materially from those discussed include but are not limited to: general economic and business and market conditions; lack of growth in U.S. and European economies; increases in interest rates; economic conditions in Asia; changes in foreign currencies against the U.S. dollar; customer acceptance of new products; efficacy of new technology; changes in U.S. or foreign laws and regulations; increased competitive and/or customer pressure; the Company's ability to maintain chemical price increases; higher-than-expected raw material costs and availability for certain chemical product lines; a change in the antidumping duties on certain products; price increases due to changes in Chinese taxes related to exports from China; increased foreign competition in the calcium hypochlorite markets; unfavorable court decisions, including unfavorable decisions in appeals of antidumping rulings, arbitration or jury decisions or tax matters; the supply/demand balance for the Company's products, including the impact of excess industry capacity; failure to achieve targeted cost-reduction programs; capital expenditures in excess of those scheduled, such as the China plant; environmental costs in excess of those projected; the occurrence of unexpected manufacturing interruptions/outages at customer or Company plants; a decision by the Company not to start up the hydrates manufacturing facility; unfavorable weather conditions for swimming pool use; inability to expand sales in the professional pool dealer market; the impact of global weather changes; changes in the Company's stock price; and gains or losses on derivative instruments.