Showa Chemical Industry Co., Ltd. Showa Chemical Industry Co., Ltd. manufactures and sells diatomite and perlite filter aids and functional additives primarily under the Radiolite trademark and Topco brand; its diatomite filter aids and fillers serve applications in food and beverage processing, pharmaceuticals, chemical manufacturing, pool water treatment, wastewater treatment, incinerator exhaust filtration, building materials, silicone resins, and soil conditioners, while perlite products support liquid and gas filtration and particulate removal; the company also provides functional additives for coatings, agricultural chemicals, and other industrial products. Founded in 1930 and headquartered in Tokyo, Japan, Showa Chemical Industry operates mining and processing facilities at three diatomite sites in Akita, Okayama, and Oita Prefectures, a diatomite plant in Jilin Province, Northeast China, for domestic Chinese and Asian export markets, a high-purity filter aids specialty plant near Osaka for pharmaceutical and beverage sectors, and perlite mines in Akita and Yamagata Prefectures with processing at the Tochigi Plant. The company maintains leadership in Japan's diatomite and perlite markets through ongoing technological enhancements for product performance and quality, with approximately 218-220 employees and operations focused on the specialty chemicals sector serving industrial and consumer end-markets globally. In February 2024, Showa Chemical Industry established a strategic partnership via a memorandum of understanding with African Diatomite Industries Limited in Kenya to expand diatomaceous earth product reach and foster economic collaboration between Japan and Kenya.