Corundum mullite brick is a high alumina refractory product composed of corundum and mullite. Corundum mullite brick refers to refractory products made of high-purity or purer raw materials. The existence of oxide impurity with low melting point will reduce its high temperature performance. The raw material of mullite, especially the content of alkali metal oxide, which is synthesized from industrial alumina powder and pure clay, bauxite or silica, should be as low as possible. The products with mullite as aggregate have good thermal shock resistance, but less erosion resistance. The products with corundum sand as aggregate have good corrosion resistance, but less thermal shock resistance.

Project	High quality and high purity corundum brick	Sintered white corundum brick	Mullite corundum brick
Item	High Quality  and High Purity Corundum brick	sinter Corundum brick	Mullite- corundum brick
Al2O3 %	≥99	≥90	≥80
SiO2 %	≤0.2	≤8	≤18
Fe2O3%	≤0.2	≤0.2	≤0.3
bulk density g/cm3 Bulk density	≥3.2	≥3	≥2.8
Apparent porosity % Apparent porosity	≤19	≤20	≤20
Normal temperature compressive strength MPa CCS	≥100	≥100	≥100
Start temperature of  load softening ℃ (0.2Mpa,0.6%) Refractoriness under load	≥1700	≥1700	≥1700
Application	It is mainly used in key parts of kilns in iron and steel, electronics,  petrochemical, chemical fertilizer, nonferrous metals, refractories and other industries
Application	Primarily used for the key parts of the industrial furnace of steel,electronics,petrochemical, fertilizers,non-ferrous metals,refractory material, etc