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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model NEW YORK ( TheStreet) -- The ex-dividend date for Sigma-Aldrich Corporation (Nasdaq: SIAL) is tomorrow, August 29, 2012. Owners of shares as of market close today will be eligible for a dividend of 20 cents per share. At a price of $70.12 as of 9:30 a.m. ET, the dividend yield is 1.1%. The average volume for Sigma-Aldrich has been 638,100 shares per day over the past 30 days. Sigma-Aldrich has a market cap of $8.53 billion and is part of the basic materials sector and chemicals industry. Shares are up 13.1% year to date as of the close of trading on Monday. 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 18.8, equal to the average chemicals industry P/E ratio and above the S&P 500 P/E ratio of 17.7.