premium high alumina refractory brick insulation with high service temperature, small thermal conductivity, small reheating linear change, long life and other characteristics, are widely used in petrochemical industrial hydrogenation, hydrogen production of ethylene cracking furnace, heating furnace, ammonia two stage gasifier thermal equipment lining. shaft furnace, the product is suitable for continuous casting and rolling furnace third storey brick, which is characterized by high temperature resistance, low coefficient of heat conductivity, high strength.