... Powder, Si02 99.3% CNPC brand,Factry price ,Good service from 200 to 8000 mesh D50:1.6um,D50 3um,D50 5um,D50 ... POWDER TECHNICAL DATA FEATURES Through chemical blanching and the superfine processing from the super purified and high quality natural silica ore. ... good gloss, anti-corrosive, anti- acid and anti alkali. The ideal raw materials and filler in comprehensive applications including polysilicon ...