high quality Silicon Metal Powder 441The classification of metal silicon is usually according to the content of three main impurities, Fe,Al,Ca. According to the content of Fe,Al,Ca, the metal silicon can be  divided into different grades, such as 553,441,411,421,3303,3305,2202,2502,1501,1101. Feature: Silicon metal widely applied to refractory material and powder metallurgy industry to improve the heat resistance ,wear resistance and oxidation resistance . Uses: As non-ferrous alloy additives.      Grade Composition Si Impurities (%) Fe Al Ca ≤ 441 99.1 0.4 0.4 0.1 Size: 10-50mm,50-100mm or as customers' requirements. Packing: Ton parcel, 1000kg/bag