Westlake Chemical Corp. is buying Vinnolit Holdings GmbH for €490 million (U.S. $668.5 million) from private equity firm Advent International.

Vinnolit, headquartered in Ismaning, Germany, manufactures polyvinyl chloride (PVC), a product used in the construction process. Boston-based Advent bought the company in 2000, and made several add-on acquisitions, including the 2007 deal for Ineos Paste PVC business, which increased the company's production capacity.

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