Fused magnesia is smelted from high-quality magnesite or high-grade caustic calcined magnesia powder by electric furnaces.As a kind of high-grade basic refractory material,it has such features of high purity,low impurity high bulk density,complete structure,and superior corrosion resistance,and widely used in the fields of metallurgy,building materials,chemical industry,national defence,scientific research,aerospace spaceflight industry,medical apparatus and instruments and household appliance.