High-purity silica sand

99.5 to 99.9% SiO2, Fe2O3 content 0-0.005% . They were 1-3 grade category of natural crystals and quality natural stone, carefully selected, meticulously processed. Size range 1 to 0.5 mm ,0.5 to 0.1 mm , 0.1 to 0.01 mm , 0.01 to0.005 mm . Production can also be customized.