SIGMA-ALDRICH TEAMS WITH 3M TO PROVIDE TIPS PENTACENE

Sigma-Aldrich has customers in life science companies, university and government institutions, hospitals, and in industry. Over one million scientists and technologists use its 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 website at http://www.sigma-aldrich.com.

Cautionary Statement: This press release contains forward-looking statements which can be identified by the use of forward looking terminology such as "intend", "committed", "exclusive" or similar expressions, or by discussions of strategy, plans or intentions that involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance, or achievements expressed or implied by such statements. There can be no assurance that the market for TIPS Pentacene will develop as the Company expects or that further products will be added to the collaboration between 3M and the Company. A further discussion of the Company’s risk factors can be found in Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2008. The Company does not undertake any obligation to update these forward-looking statements.