Quanzhou Winitoor Industry Co.,Ltd is specilaing in microsilica. We own a system of produce, develop and export microsilica world wide. Our materials are collected form the ferrosilicon production. It is gray to off-white in color complying to ASTM C 1240 international stardard. www.globalsources.com/everwintiles. co Silica fume is a mineral admixture, composed of submicron particles of silicon dioxide, manufactured as co-product from the production of silicon and ferrosilicon metal. When added to concrete, silica fume acts as both a filler, improving the physical structure by occupying the spaces between the cement particles and as a 'pozzolan,' reacting chemically to impart far greater strength and durability to concrete. Also .silica ...
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