Silica Fume, Micro Silica 85%-97%

Silica fume, also called as micro silica, silica dust, which is a by-product of producing silicon metal or ferrosilicon alloys. Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2). The individual particles are extremely small, approximately 1/100th the size of an average cement particle. Because of its fine particles, large surface area, and the high SiO2 content, silica fume is a very reactive pozzolan when used in concrete. The quality of silica fume is specified by ASTM C 1240 and AASHTO M 307.
Specification :
Analysis Result
SF85 SF88 SF90 SF92 SF94 SF96
SiO2(%)(min.) 85.05 88.05 90.05 92.05 94.05 96.05
Fe2O3(%) 0.78 0.44 0.21 0.25 0.20 0.17
Al2O3(%) 0.29 0.20 0.21 0.25 0.20 0.15
CaO(%) 0.39 0.31 0.31 0.36 0.21 0.18
K2O+ Na2O (%) 0.29 0.24 0.22 0.20 0.20 0.20
Moisture(%) 3.05 2.55 2.05 2.05 1.03 0.85
Loss on Ignition (L.O.I) @975OC(%) 3.38 3.10 2.38 1.75 1.50 1.25
Bulk Density (kg/m³) 250-750 250-750 250-750 250-750 250-750 250-750