Showa Chemical Industry Co., Ltd. engages in manufacturing and selling diatomite and perlite filter aids under the Radiolite trademark and Topco brand in China and Japan. Its diatomite and perlite filter aids are used to remove particulates from liquids and gases, as well as liquid filtration applications. The company also provides functional additives for use in coatings, agricultural chemicals, and other industrial products. Showa Chemical Industry Co., Ltd. was founded in 1930 and is headquartered in Tokyo, Japan.