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Silica Chemical formula SiO2 molecular weight: 60.08 Chinese Alias: silicone, silica, silica, silicic anhydride, quartz sand Synonyms: Silicon dioxide SiO, Silicon (IV) oxide, Silicic anhydride, Quartz sand CAS Number:? 7631-86- 9, also known as silica. It is widely distributed in nature, such as quartz, quartz sand. White or colorless particles, high iron content is pale yellow. The density of 2.2 to 2.66 melting point 1670 ℃ (tridymite); 1710 ℃ (cristobalite). Boiling point 2230 ℃, the relative dielectric constant of 3.9. Can play a role when the molten alkali insoluble in water slightly soluble in acid, in particulate state. Used in making glass, water glass, pottery, ceramics, refractories, ferrosilicon, sand, elemental silicon. Can reduce tire rolling resistance while improving the wear resistance of the tire and wet skid resistance. Silica gel material tensile strength, tear strength, abrasion resistance, etc. are improved. Coating the filler (the paint can be improved weatherability), can be used to produce the matting agent, the coating can also be used as a thickener. Food, medicine mainly used in the food industry to prevent caking powdered food gathering, in order to maintain a free flow of food additives or for the adsorption of liquid spices, oils, vitamins, etc., making powder, such as powdered fat, solid perfumes and solid wine like the products. (Example: milk) in the production of drugs can be used as a flow aid, a catalyst carrier. 1, medicinal Silica: mainly used as lubricants, anti-adherents, glidants 2, food and beverage with silica: flow aids, anti-caking properties.