Fused Silica Products Fused Silica Grains Grains 10/30 Mesh Grains 30/50 Mesh Grains 50/100 Mesh Fused Silica Powder Powder 200 Mesh Powder 325 Mesh Powder 400 Mesh Technical Specification SiO2 99.9% Minimum Density 2.20 gm/cm3 Hardness 5.5 – 6.5 Mohs