silica gel alias: silicate gel is a highly active adsorb material, belong amorphous material, chemical formula: mSiO2·nH2O; except strong base 、 hydrofluoric acid It does not react with any substance outside, is insoluble in water and any solvent, non-toxic and tasteless, chemical property stable. Various types of silica gel have different microporous structures due to different manufacturing methods. The chemical composition of silica gel and physical structure , It is determined that it has many characteristics that other similar materials are difficult to replace: adsorption high energy, Thermal stability well, chemical stability, and high mechanical strength. It is widely used in various industries such as food, medicine, electronics, equipment, and clothing, etc.