Produced by using high-purity fused magnesia as the main raw material, high-pressure molding and high-temperature firing. This series of products have the advantages of high temperature strength, high temperature volume stability, strong slag resistance and high refractoriness. They are mainly used in permanent lining parts of steelmaking furnaces, lime kiln, glass kiln, regenerator, ferroalloy furnace, mixed iron furnace, non-ferrous metal furnaces, etc., different brands of magnesia bricks are selected according to different conditions of use.