DuPont says it is investing $175 million to expand a line of solar materials used as a backing in solar cells, in addition to the $120 million the company announced it was investing in solar projects last August.

The money will be used at the company’s Circleville, Ohio plant, which will start producing Tedlar – polyvinyl fluoride films, resins and adhesives – in September 2011.

The company was recently given $50 million in manufacturing tax credits for the plant from the stimulus bill.

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See also DuPont completes US$295m solar PV expansion