Quartz Grits – 65 Micron Grade Grits 65 Micron Premium Grits 0.065 ~ 0.15 mm Grits 0.065 ~ 0.20 mm Grits 0.065 ~ 0.30 mm Grits 0.065 ~ 0.40 mm Grits 65 Micron Supreme Grits 0.065 ~ 0.15 mm Grits 0.065 ~ 0.20 mm Grits 0.065 ~ 0.30 mm Grits 0.065 ~ 0.30 mm Technical Specification PremiumSupremeSiO299.9% Minimum99.7% MinimumDensity2.66 gm/cm32.66 gm/cm3Hardness6 – 7 Mohs6 – 7 Mohs