It is mainly used for lining of blast furnace, hot air furnace, electric furnace top, blast furnace, reverberatory furnace and rotary kiln.
In addition, high alumina firebrick is widely used as open hearth grate brick of regenerative type, plug head of pouring system, nozzle brick and so on.
Usually divided into three classes:
ⅠClass: Al2O3 ≥ 75%;
Ⅱ Class: Al2O3: 60% ~ 75%;
Ⅲ Class: Al2O3: 48% ~ 60%.