Sigma-Aldrich Continues to Expand Analytical Suite with Resource Technology Corporation Acquisition


ST. LOUIS, Jan. 31, 2011 - Sigma-Aldrich® Corporation (Nasdaq: SIAL) announced today that it has acquired the assets of Resource Technology Corporation (RTC) of Laramie, Wyoming, an industry leader in analytical standards and certified reference materials. The acquisition of RTC's business complements the recently completed acquisition of Cerilliant Corporation, and further expands and strengthens Sigma-Aldrich's analytical chemistry offerings, a key goal in assisting the Company in delivering on its strategic sales growth plans. Terms of the purchase were not disclosed.

The RTC product offerings also complement the Company's well-regarded Supelco and Fluka brand analytical reagents, standards and separation consumables with the addition of its core expertise in design, development, characterization and packaging of analytical standards, matrix standards, certified reference materials and proficiency testing. With this acquisition, Sigma-Aldrich now serves a wide range of applications, including the fast-growing environmental and pharmaceutical sectors.

"The strong and innovative products offered by RTC bring new opportunities for expanding our business," commented Russel Gant, Vice President of the Analytical Research business for Sigma-Aldrich. "Their experienced team, capabilities and customer contacts combine nicely with our breadth of product, high-quality portfolio, extensive scientific knowledge and global footprint. The RTC acquisition will allow Sigma-Aldrich to provide customers with an even broader range of specialized, analytical standards and services."

This is the second acquisition made by Sigma-Aldrich in recent weeks. In December 2010, the Company acquired Cerilliant Corporation, an industry leader in supplying high quality reference standards and materials that support the clinical diagnostics, environmental, nutraceutical, pharmaceutical, forensic and clinical toxicology markets.

About Sigma-Aldrich:

Sigma-Aldrich is a leading Life Science and High Technology company committed to Enabling Science to Improve the Quality of Life. Its 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. More than one million scientists and technologists use its products. Sigma-Aldrich operates in 40 countries and has 7,900 employees providing excellent service worldwide. For more information about Sigma-Aldrich, please visit its award-winning Web site at www.sigma-aldrich.com.

SOURCE Sigma-Aldrich Corporation

CONTACT:

Kirk Richter,

Vice President,

Treasurer & Interim CFO,

+1-314-286-8004,

or Dr. Frank Wicks,

President,

Research Essentials & Research Specialties & Managing Director,

North America,

+1-314-286-8008,

both of Sigma-Aldrich

Web Site: www.sigma-aldrich.com

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