... min 4.Quality:SGS certificate with ASTM-C1240 Standard Brief introductionMicro silica ,also called silica fume or micro silica, ... non-crystalline) silicon dioxide(SiO2),its average granule diameter is 0.15~0.20um,specific surface area ... ,acids and sulfates5).Low chloride ion diffusion6).High reactive Pozzolan7).High temperature strength8).Improved stability ingeothermal environmentApplication areaThe ...