High alumina refractory brick

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High alumina firebricks are classified according to the alumina content which is from lowest 48% to highest 95%, manufactured from mineral of bauxite, corundum, etc. by mixing, press-forming, drying, sintering and machining. High alumina bricks feature stable mechanical strength and thermal shock resistance, with high refractoriness of no lower than 1880℃, High alumina bricks are commonly used as refractory lining exposed to heat directly or backup insulation linings in various types of industrial kiln or laboratory furnace.

Item	LZ-75	LZ-65	LZ-55	LZ-48
Al2O3 %	≥75	≥65	≥55	≥48
Cold crushing strength ,MPa	≥54	≥49	≥44	≥40
Apparent porosity ,%	≤23	≤23	≤22	≤22
Refractoriness under load , °C	≥1520	≥1500	≥1470	≥1420
Reheating linear change (1500°C,2h) %	+0.1-0.4	+0.1-0.4	+0.1-0.4	(1450°C,2h)+0.1-0.4
Refractoriness °C	>1790	>1790	>1770	>1750