Nihon Seiko Co., Ltd. manufactures and sells antimony products and metal powders in Japan. It offers antimony trioxide, which is used as a flame-retardant additive for various plastics and rubbers, polyester polymerization catalysts, and solid lubricant in brake pads. The company also provides antimony metal for use in raw materials for semiconductors, film for optical memory disks, thermo-electron converters, storage batteries, bearing metals, hard lead castings, cable sheathing, typemetals, and sheet and pipe alloys; antimony metal powder for glass fining agents and alloys; antimony metal shots for alloys; and copper and antimony metal powder for electric detonators. In addition, it offers special treatment antimony trioxide; sodium antimonate for use in engineering plastics, and decolorization and fining of glasses; antimony trisulfide for use in friction materials, match box flints, fireworks, glass fining agents, powder for toys, and flash mixtures; and antimony pentasulfide for surface treatment of decorative trims and building materials. Further, the company provides antimony trichloride and antimony pentachloride for use as catalysts in fluorination, chlorination, and bromination of organic compounds, pigments, and semiconductor materials; and STEM series products that are mixtures of flame retardants for use in polyolefin plastics, such as PP and PE. Additionally, it manufactures and sells atomized metal powders of copper, tin, bronze, brass, silver, platinum, gold, stainless steel, nickel, nickel alloy, etc. The company was formerly known as Nakase Kogyo Co., Ltd. and changed its name to Nihon Seiko Co., Ltd. in 1936. Nihon Seiko Co., Ltd. was incorporated in 1935 and is headquartered in Tokyo, Japan.