Sunpolymer Corp., a manufacturer and seller of extruded silicone rubber, high-performance sponge sheet and molded products, is planning to build a new factory at the Santo Industrial Park, Asago, Japan. Established in Osaka in 1980, Sunpolymer specializes in made-to-order production using silicone rubber as a primary material. The company manufactures products for a wide range of fields, from medical devices…