silica

Silica is found in nature in several forms, including quartz and opal. In fact, it has 17 crystalline forms (see Nomenclature of Silica). The most common constituent of sand in inland continental settings and non-tropical coastal settings is silica, usually in the form of quartz because the considerable hardness of this mineral resists erosion. However, the composition of sand varies according to local rock sources and conditions.

Related products: Silica fume, Silica Fabrics, Silica Sand

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.