Silica is a chemical compound that is an oxide of silicon with the chemical formula SiO2, It has been known since ancient times. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms (frustule).
Silica is manufactured in several forms including fused quartz, crystal, fumed silica (or pyrogenic silica), colloidal silica, silica gel and aerogel.
Silica is used primarily in the production of glass for windows, Metal Casting, Metal Production, Chemical Production, Construction, Paint and Coatings, Ceramics & Refractories, Filtration and Water Production, Recreational Products, Oil and Gas Recovery, drinking glasses, beverage bottles, and many other uses, The majority of optical fibers for telecommunications are also made from silica, It is a primary raw material for many ceramics such as earthenware, stoneware and porcelain.
Silica is a common additive in the production of foods, where it is used primarily as a flow agent in powdered foods or to absorb water in hygroscopic applications, It is the primary component of diatomaceous earth which has many uses ranging from filtration to insect control, it is also the primary component of rice husk ash which is used for example in filtration and cement manufacturing.