... materials is more strict about the products ‘ precise and fine grade . Micro-fine powder materials is easy to adhere , possessing with ... , 320-500 meshes zinc powder , 500 meshes black iron oxide , red iron oxide , 120—160 meshes Chinese medicine powder , 180- ... , copper powder , carbon black , active carbon , light calcium carbonate , iron ore sand ect .4.Features high sieving efficiency : more than ...