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Silica fume powder, also called Microsilica, is a byproduct ofproducing silicon metal or ferrosilicon alloys. Silicon metal andalloys are produced in electric furnaces. The raw materials arequartz, coal, and woodchips. The smoke that results from furnaceoperation is collected and sold as silica fume, rather than beingland filled. Silica fume consists primarily of amorphous(non-crystalline) silicon dioxide (SiO2), its average granulediameter is 0.15~0.20 µm,specific surface area is 15000~20000m2/kg, and it has extremely strong surface active.Silicafume
