Quartz Powder High Purity Silica Powder Filler Premium High Purity Silica Powder Filler Supreme Technical Specification Premium Supreme Medium SiO2 99.8% Minimum D@50(APS) 3μm ~ 50μm Whiteness 96 Minimum 93.5 ~ 95.9 90 ~ 93.4 Density 2.66 gm/cm3 Hardness 6~7 Mohs