MS25 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 Filler material, Heavy duty paints, coating, fiberglass and Chemicals. Typical Properties   Bulk Density 0.65g/cm ³ Oil Absorption 28g/100g PH 7 Hardness 7 Moh's Minimum 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