The content of alumina in corundum bricks is more than 90%, so corundum is the main crystal phase of refractory products. High normal temperature compressive strength (up to 340MPa). High load hardening onset temperature (greater than 1700 ℃). Good chemical stability, strong resistance to acidic or alkaline slag, metal and glass liquid, etc. The thermal shock stability has nothing to do with its structure. The corrosion resistance of the compact product is superior, but the thermal shock stability is poor.

Corundum bricks are divided into sintered corundum bricks and fused corundum bricks. It can be made by sintering alumina and fused corundum as raw materials or bauxite clinker with high Al2O3/SiO2 ratio and sintered alumina. Unfired corundum bricks can also be made of phosphoric acid or other binders. It is used in iron-making blast furnaces and blast furnace hot blast furnaces, refining furnaces outside steel-making furnaces, sliding water heaters, glass melting furnaces and petrochemical industry furnaces.

It is widely used in the lining of various low-temperature kilns and kiln furniture in the petrochemical and chemical fertilizer industries, such as cracking, reforming furnaces, and metallurgical industries.