ARJ Arch Chemicals

Arch Chemicals, Inc. announced today that it will incorporate Sporgard^™ technology into new biocide solutions to actively combat mold and fungi in paints, coatings and other building products.  Sporgard^™ technology, an advanced mold solution developed by Syngenta, has gained wide attention with its offering of multiple mold inhibitors used to protect the world's food crops and for other end-use applications.

"Arch Chemicals is excited about the opportunity to expand our family of biocides for building products with Sporgard^™ technology, which represents the next generation in dry-film fungicides for coatings products," said Mark Kenline, Global Business Director for Arch Chemicals' Industrial Biocides Building Products business.  "This alliance with Syngenta builds on Arch's well-established reputation for superior microbiology product formulation skills, regulatory and toxicological expertise and in-depth market knowledge."

"Protection from mold and fungi are of growing importance to builders and end-users," said Robert Vink, Business Manager Syngenta Materials Protection. "The Sporgard^™ combination of fungicides provides the most sophisticated mold control technology available."

About Arch Chemicals, Inc.

Headquartered in Norwalk, Connecticut (USA), Arch Chemicals, Inc. is a global Biocides company with annual sales of approximately $1.4 billion.  Arch and its subsidiaries provide innovative, chemistry-based solutions to selectively destroy and control the growth of harmful microbes.  The Company's concentration is in water treatment, hair and skin care products, wood treatment, 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 about Arch's Industrial Biocides business, please visit www.archbiocides.com.

About Syngenta

Syngenta is one of the world's leading companies with more than 24,000 employees in over 90 countries dedicated to our purpose: Bringing plant potential to life.  Through world-class science, global reach and commitment to our customers we help to increase crop productivity, protect the environment and improve health and quality of life. For more information about us please go to www.syngenta.com or www.growmorefromless.com.

Use Biocides Safely.

Always read the label and product information before use.

Some Arch Biocides may not be registered or registered for only certain uses in your country.

Arch Biocides is a business unit of Arch Chemicals, Inc.

Arch^® is a registered trademark of Arch Chemicals, Inc.

The Syngenta logo is a registered trademark of a Syngenta Participations AG.

Sporgard^™ is a trademark of Syngenta Participations AG.

CONTACT:  Arch Chemicals, Inc.

          Investor Contact:

          Mark E. Faford

            (203) 229-2654

          Press Contact:

          Dale N. Walter

            (203) 229-3033