The Tosoh Corporation was founded in 1935 as Toyo Soda Manufacturing. It is a Japanese multinational that specializes in specialty chemicals, and comprises of over 100 companies worldwide and a workforce of over 12,000. Its products include electrolytic manganese dioxide (EMD), specialty polymers, fine chemicals, scientific instrumentation, thin-film materials, fabricated silica glass and water treatment technologies. Today, its corporate headquarters are in Tokyo, Japan.