Showa Chemical Industry Co., Ltd.

Showa Chemical Industry Co., Ltd. manufactures and sells diatomite and perlite filter aids under the Radiolite and Topco brands in Japan and China. These filter aids are used to remove particulates from liquids and gases and in liquid filtration applications. The company also supplies functional additives for coatings, agricultural chemicals, and other industrial products. Founded in 1930, it is headquartered in Tokyo, Japan.