Refractory Bricks
High alumina refractory brick

High alumina refractory brick

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


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