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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 Westlake Chemical Corporation (NYSE: WLK) is tomorrow, November 27, 2012. Owners of shares as of market close today will be eligible for a dividend of $3.94 per share. At a price of $75.89 as of 9:31 a.m. ET, the dividend yield is 1%. The average volume for Westlake Chemical has been 515,100 shares per day over the past 30 days. Westlake Chemical has a market cap of $4.94 billion and is part of the basic materials sector and chemicals industry. Shares are up 88.6% year to date as of the close of trading on Friday. Westlake Chemical Corporation manufactures and markets basic chemicals, vinyls, polymers, and fabricated building products. It operates in two segments, Olefins and Vinyls. The company has a P/E ratio of 15.7, below the S&P 500 P/E ratio of 17.7.