ST. LOUIS, Nov. 10 /PRNewswire-FirstCall/ -- At the Board of Directors meeting held today, the Directors declared a quarterly cash dividend of $.145 per share, an 11.5% increase over the prior year level. The dividend is payable on December 15, 2009 to shareholders of record on December 1, 2009.

About Sigma-Aldrich: Sigma-Aldrich is a leading Life Science and High Technology company. Our chemical and biochemical products and kits are used in scientific research, including genomic and proteomic research, biotechnology, pharmaceutical development and as key components in pharmaceutical, diagnostic and other high technology manufacturing. The Company has customers in life science companies, university and government institutions, hospitals, and in industry. Over one million scientists and technologists use our products. Sigma-Aldrich operates in 38 countries and has 7,800 employees providing excellent service worldwide. Sigma-Aldrich is committed to Accelerating Customer Success through Innovation and Leadership in Life Science, High Technology and Service. For more information about Sigma-Aldrich, please visit its award-winning Web site at http://www.sigma-aldrich.com.