Our Fused Silica made from silica sand. 1.SiO2: 99.9Min 2.All sizes are available 3.Competitive ... sand, through high temperature fusion, cooling, smash and selecting. The powder is produced using fused silica lump as material, it is ... linear expansion coefficient, low stress and low radioactivity.Chemical Composition (%) SiO2≥99.9Fe2O3≤15ppmLi2O≤1.0ppmAl2O3≤25ppmK2O≤20ppmNa2O≤11ppmSize Available0-1mm ...