　　High-alumina brick is a calcined high-alumina bauxite clinker and a binder that are first granulated and pulverized, then mixed at a certain ratio, and then pressed and fired at high temperature. According to the physical and chemical indicators are divided into five brands LZ-80, LZ-75, LZ-65, LZ-55, LZ-48. Mainly used in high temperature parts of industrial kiln.

Physical and chemical indicators:

Item	Indicator
Item	LZ-80	LZ-75	LZ-65	LZ-55	LZ-48
Al2O3 % ≥	80	75	65	55	48
Apparent porosity % ≤	21	24	24	22	22
Compressive strength at room temperature Mpa ≥	70	60	50	45	40
0.2MPaLoad softening start temperature ℃ ≥	1530	1520	1500	1450	1420
Heating permanent line change %	1500℃×2h -0.4～+0.2		1450℃×2h -0.4～+0.1

High aluminum standing brick

High-alumina brick

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