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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) -- Westlake Chemical Corporation (NYSE: WLK) hit a new 52-week high Friday as it is currently trading at $98.43, above its previous 52-week high of $98.27 with 251,259 shares traded as of 11:31 a.m. ET. Average volume has been 558,600 shares over the past 30 days. Westlake Chemical has a market cap of $6.17 billion and is part of the basic materials sector and chemicals industry. Shares are up 21.2% year to date as of the close of trading on Thursday. 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 14.7, below the S&P 500 P/E ratio of 17.7.