Mullite refractory castable is a medium to low temperature insulating material usually made of mullite aggregate, which is used as a raw material for Refractory, generally, it is used in tube-type heating furnace, light diesel oil, ethane cracking furnace lining, atmospheric and vacuum furnace, sulfur recovery device, steam boiler, heat insulation layer of Tortoise Shell Net, single layer of heat insulation of tube body and pipeline, other industrial furnace doors, fire-looking holes, inner lining of observation holes, etc. . The advantage of mullite refractory castable is that it has a higher refractory temperature than other insulating castable and can be used directly in contact with the flame and as the lining of a kiln. There is also a corundum mullite refractory castable corundum mullite castable is made of Corundum as aggregate and powder with some binders. Compared with high alumina castable and mullite castable, it has higher mechanical strength and abrasion resistance, but less thermal shock resistance.