Stock Photo - Germany, Wesseling, 26/03/2015 Evonik, the industrial group from Germany, is one of the world's leading specialty chemicals company. At Wesseling near Cologne is the world's largest silica production. The material is essential for safe and environmentally friendly low rolling resistance tires. Photo: Employees in the filter cake exception of a filter press in silica-technical research - Wesseling, Germany, 26/03/2015

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