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High-aluminous brick
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In accordance with the maintenance of îxide of aluminium and sphere of application high-aluminous fire-resistant production is classified on following kinds: high-aluminous brick of a general purpose, alumina on a phosphatic sheaf for cement furnaces, heat resisting high-aluminous brick, a brick for building of blast furnaces, and also the alumina used for the arches of electroarc furnaces.
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Chemical compound and physical parameters
| Parameters | High-aluminous brick of a general purpose |
| LZ-48 | LZ-55 | LZ-65 | LZ-75 |
| Al2O3 ≥ (%) | 48 | 55 | 65 | 75 |
| Fe2O3 ≤ (%) | 2.0 | 2.0 | 2.0 | 2.0 |
| Physical properties |
| Property | LZ-48 | LZ-55 | LZ-65 | LZ-75 |
| Porosity, ≤ % | 22 | 22 | 23 | 23 |
| Limit of strength at compression, ≥MPa | 40 | 44 | 49 | 54 |
| Fire resistance, ≥°C | 1750 | 1770 | 1790 | 1790 |
| Fire resistance under loading ≥°C | 1440 | 1470 | 1500 | 1520 |
| Linear change at repeated heating, % | 1500°Cõ2h | | +0.1 ~ 0.4 | +0.1 ~ 0.4 | +0.1 ~ 0.4 |
| 1450°Cõ2h | +0.1 ~ 0.4 | | | |
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