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NEW YORK ( TheStreet) -- The ex-dividend date for Sigma-Aldrich Corporation (Nasdaq: SIAL) is tomorrow, May 30, 2012. Owners of shares as of market close today will be eligible for a dividend of 20 cents per share. At a price of $71.94 as of 9:30 a.m. ET, the dividend yield is 1.1%. The average volume for Sigma-Aldrich has been 561,700 shares per day over the past 30 days. Sigma-Aldrich has a market cap of $8.6 billion and is part of the basic materials sector and chemicals industry. Shares are up 13.8% year to date as of the close of trading on Friday. Sigma-Aldrich Corporation, a life science and high technology company, develops, manufactures, purchases, and distributes various chemicals, biochemicals, and equipment worldwide. The company has a P/E ratio of 19.2, equal to the average chemicals industry P/E ratio and above the S&P 500 P/E ratio of 17.7.