The white carbon black is generally divided into precipitated white carbon black and gas phase white carbon black according to the production method. Under normal conditions, fumed silica is white amorphous flocculent translucent solid colloidal nanoparticles (particle size less than 100nm), non-toxic, and has a huge specific surface area. The fumed silica is all nano silica, the product purity can reach 99%, and the particle size can reach 10-20 nm, but the preparation process is complex and expensive; Precipitation white carbon black can be divided into traditional precipitation white carbon black and special precipitation white carbon black. The former refers to silicon dioxide produced with sulfuric acid, hydrochloric acid, CO2 and water glass as basic raw materials, and the latter refers to silicon dioxide produced with special methods such as high gravity technology, sol gel method, chemical crystal method, secondary crystallization method or reverse micellar micro lotion method. Precipitated silica is mainly used as reinforcing agent of natural rubber and synthetic rubber, toothpaste friction agent, etc. Vapor phase silica is mainly used as reinforcing agent, coating and unsaturated resin thickener of silicone rubber, and ultra-fine silica gel and aerogel are mainly used as coating matting agent, thickener, plastic film opening agent, etc. Silica is a porous material, and its composition can be represented by SiO2 · nH2O, in which nH2O exists in the form of surface hydroxyl. It is soluble in caustic soda and hydrofluoric acid, but insoluble in water, solvent and acid (except hydrofluoric acid). High temperature resistance, nonflammable, tasteless, odorless, and good electrical insulation.