High Alumina Castable Introduction High Alumina Castable is a kind of refractory castable which uses high alumina raw material as aggregates and the powder and then be added with binding agent. High aluminum refractory castable has high mechanical strength, good thermal shock resistance, good corrosion resistance. It's mainly used for furnace lining of boiler, blast furnace hot blast stove, heating furnace, ceramic kiln and various industrial furnaces. Phosphate Bonded Castable Features Compared with the calcium aluminate cement bonded castable, phosphate bonded castable has better cold crushing strength and thermal shock resistance.