MS63   Description This grade of micronized silica flour is manufactured from super fine silica sand having a SiO 2 content of up to 99%. Recommended Applications Ceramics , Construction chemicals Oil drilling, and Filler materials,. Typical Properties   Bulk Density 0.82g/m ³ Oil Absorption 26g/100g PH 7 Hardness 7 Moh's Maximum brightness 90 Chemical Composition   SiO 2 98.8-99.1% Fe 2 O 3 0.025-0.04% Al 2 O 3 0.50-1.00% TiO 2 0.04-0.09% Particle Distribution