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We've been making and exporting fused silica sand and powder for many years to the industry of refractory, investment casting, thermal ceramic,fused silica crucible,fused silica ceramic roller etc. 1. Fused silica grains/powder 1.1 Physical Properties Composition: SiO2 Structure: Amorphous Colour: Transparent or white Melting: Temperature approx.1750℃ Specific Gravity: 2.21g/cm3 Hardness:  7 Mohs Thermal Expansion:  0.5*10-6 1.2.Chemical composition SiO2>99.9%,Fe2O3<30ppm,Al2O3<200ppm,Na2O<30ppm,K2O<30ppm 1.3.Different sizes are available: 0-0.5mm, 0.2-0.5mm,0-1mm,1-3mm,3-5mm, -4/10mesh,-10/20mesh,-20/50mesh,-30/50mesh.-50/100mesh,-6/50mesh,-100mesh, 120F , 270F, 325F , 400F , 600mesh,…