1800℃. Mica powder is a nonmetallic mineral with a melting point of about 1800℃, and contains many components, among which SiO2 _ 2 is the main one, with a content of about 49% and Al _ 2O _ 3 about 30%. Mica is an excellent additive with good elasticity, toughness, insulation, high temperature resistance, acid and alkali resistance, corrosion resistance and strong adhesion. In addition, the chemical composition, structure and structure of mica powder are similar to kaolin, and it also has some characteristics of clay minerals, that is, good dispersion and suspension in water media and organic solvents, fine white particles, stickiness and so on. It is widely used in electrical appliances, welding electrodes, rubber, plastics, paper making, paints, coatings, pigments, ceramics, cosmetics, new building materials and other industries. With the continuous development of science and technology, people have opened up new application fields.