High alumina brick is a kind of refractory material. The main component of this refractory brick is Al?O?.

If the Al?O? content is higher than 90%, it is called corundum brick. Due to different resources, national standards are not completely consistent. For example, European countries stipulate that the lower limit of Al?O? content for high aluminum refractory is 42%. In China, the Al?O? content in high-alumina bricks is usually divided into three grades: Ⅰ etc.-Al?O? content> 75%; Ⅱ etc.-Al?O? content is 60 ~ 75%; Ⅲ etc.-Al?O? content is 48 ~ 60%.