Hemlock, the largest producer of polysilicon in the United States, completed the acquisition of the trichlorosilane business and a stake in the Hemlock Semiconductor joint venture from DuPont, a chemicals company, for $725m. Based in Midland, Mich., the TCS business produces trichlorosilane, a key raw material for Hemlock Semiconductor Operation’s production of high-purity polysilicon and other industrial chemicals. "This transaction is consistent with our commitment to refine our portfolio and sharpenour focus on growth opportunities where DuPont’s unique innovation capabilities can create greater shareholder value. We have a defined strategy of active portfolio management to further align the company’s resources to deliver higher margins and returns, aligned with our disciplined approach to capital allocation," Ed Breen, DuPont Executive Chairman and CEO.