Palm's Zinc Dust UP4 is a 99.0 % UltraPure® grade meeting ASTM D520 Type lll specifications for pigment's. UP4 is also designed for surface finishing's Mechanical Plating and Galvanizing systems plus a zinc dust purification / precipitation agent related to electroplating applications. Zinc Dust UP4 is manufactured from Special High Grade Zinc Metal that meets the SHG ASTM B6-98 specification and is subjected to stringent quality control standards and testing measures.Make in USA.