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Small company aime of producing silica. Silica Fume (Microsilica, Fumed Silica, Condensed Silica Fume, Silica Dust). Silica fume is a mineral admixture, composed of submicron particles of silicon dioxide, manufactured as a 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. Silica fume powder is gray to off-white in color, and is available in several product forms and packaging options.