Silica gel is a kind of super absorbent material, which is non-toxic and tasteless, and does not conflict with anything except strong corrosive chemicals such as strong alkali and hydrofluoric acid. Mainly divided into silicone and inorganic silica, silicone is divided into liquid silica gel and solid silica gel, which can be used as many auxiliary tools and medical technologies in daily life, and are often used in construction, electronics, textiles, automobiles, daily necessities, ornaments, mechanical parts, leather and paper making, chemical industry, light industry, hardware painting, medicine and so on. Inorganic silica gel is a kind of finely divided porous atoms, which has adsorption and medical adhesion in life. At present, there are beer silica gel, pressure swing adsorption silica gel, medical silica gel, color-changing silica gel, silica gel desiccant, silica sol and so on.