Electrical grade magnesium oxide is a scientifically proportioned magnesium oxide produced by beating and sieving powder particles of different mesh sizes through surface activation treatment of fused crystalline magnesium oxide. It is mainly used for refractory insulation of electric heating equipment such as Filling materials in electric heating tubes, electrical grade magnesium oxide is mainly divided into three types: low temperature magnesium oxide, medium temperature magnesium oxide, and high temperature magnesium oxide. The iron content is required to be less than 0.5