The deal will see a GCL-Poly subsidiary and Evonik build factories in Jiangsu province for fumed silica (used for adhesives and sealants in buildings and cars) and ultra-pure silicon tetrachloride (used in fiber optic cables).

With a planned 20,000 metric tonnes of annual capacity, the plants will be 40% owned by GCL-Poly, and are due on line in 2016. The deal still requires the approval of the relevant authorities, Hong Kong-listed GCL-Poly says.

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