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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.
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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 |