High Alumina Fire Brick

Al2O3% (≥) 48-80

Bulk Density (g/cm³) 1.9-2.2

Refractoriness Under Load (℃) 1420-1530

Compressive Strength (MPa) 40-70

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High Alumina bricks are refractory bricks which has Alumina content of more than 48% . These are generally made from calcined bauxite or material having high alumina content . High Alumina bricks can withstand very high temperature as compared to normal fire bricks and are thus used in high temperature zones of boilers, kiln, furnaces etc.

Item	Specification
	LZ-80	LZ-75	LZ-70	LZ-65	LZ-55	LZ-48
Al₂O₃ %	≥80	≥75	≥70	≥65	≥55	≥48
Apparent Porosity, %	≤21	≤24	≤24	≤24	≤22	≤22
Compressive Strength MPa	≥70	≥60	≥55	≥50	≥45	≥40
0.2MPa Refractoriness Under load ℃	≥1530	≥1520	≥1510	≥1500	≥1450	≥1420
Permanent Linear Change, %	1500℃×2h -0.4~0.2		1450℃×2h -0.4~0.1