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NEW YORK ( TheStreet) -- The ex-dividend date for Sigma-Aldrich Corporation (Nasdaq: SIAL) is tomorrow, November 29, 2011. Owners of shares as of market close today will be eligible for a dividend of 18 cents per share. At a price of $60.93 as of 9:30 a.m. ET, the dividend yield is 1.2%. The average volume for Sigma-Aldrich has been 850,100 shares per day over the past 30 days. Sigma-Aldrich has a market cap of $7.21 billion and is part of the basic materials sector and chemicals industry. Shares are down 11.5% year to date as of the close of trading on Friday. Sigma-Aldrich Corporation, together with its subsidiaries, develops, manufactures, purchases, and distributes a range of chemicals, biochemicals, and equipment worldwide. The company has a P/E ratio of 16.4, below the average chemicals industry P/E ratio of 16.7 and below the S&P 500 P/E ratio of 17.7.