High Purity Fused Silica High Purity Silica 10mm - 30mm High Purity Silica 30mm - 50mm High Purity Silica 50mm - 100mm Technical Specification SiO2 99.7% Minimum Density 2.20 gm/cm3 Hardness 5.5 ~ 6.5 Mohs 100% Amorphous