Westlake Chemical Closes Purchase of CertainTeed’s PVC Pipe, Fittings and Foundations Business PR Newswire HOUSTON, May 1, 2013 HOUSTON , May 1, 2013 /PRNewswire/ — Westlake Chemical Corporation (NYSE:WLK) announced today that all closing conditions, including regulatory review, have been met and it has closed the previously announced acquisition of CertainTeed Corporation’s Pipe and Foundation Group (PFG) business effective today. The PFG acquisition includes the PVC pipe, fittings, profiles and foundation business and associated facilities in Lodi, California and McPherson, Kansas with production capacity of approximately 150 million pounds per year. Westlake also has acquired technologies and intellectual properties for the production of a number of specialized products, including Certa-Lok restrained joint pipe and Yelomine™ branded products for a variety of end market applications. […]