White carbon black is a general description of the white powdery X-ray amorphous silicic acid and silicate products. It mainly refers to precipitated silica, fumed silica, and ultrafine silica; it also includes powdery synthetic silicate, calcium silicate and so on. White carbon black is a kind of porous substance. The chemical formula is SiO2•nH2O, in which nH2O exists in form of surface hydroxyl. It is soluble in caustic alkali and hydrofluoric acid; it is insoluble in water, solvent and acid (except for hydrofluoric acid). It is non-inflammable, flavorless and odorless. Besides, white carbon black has good resistance to high temperature as well as excellent electrical insulating property.