Alumina hollow brick is a light-weight insulation material, which is made of alumina hollow balls and corundum powder fired at a high temperature of 1700℃. Alumina hollow bricks are composed of numerous interconnected hollow air cells, which leads to their lightweight characteristics. All the air bubbles are evenly distributed in the brick, forming a porous structure, which not only reduces the density of the brick but also maintains a high strength.
| Item/Grade | LQZ-99-1.4 | LQZ-99-1.6 | LQZ-99-1.8 | LQZ-95-1.4 | LQZ-95-1.6 | LQZ-95-1.8 | LQZ-90-1.4 | LQZ-90-1.6 | LQZ-90-1.8 |
|---|---|---|---|---|---|---|---|---|---|
| ω (Al2O3) ≥/% | 99 | 95 | 90 | ||||||
| ω (SiO2) ≤/% | 0.3 | / | / | ||||||
| ω (Fe2O3) ≤/% | 0.2 | 0.2 | 0.2 | ||||||
| Bulk Density (g/cm³) | 1.3-1.5 | 1.5-1.7 | 1.7-1.9 | 1.3~1.5 | 1.5-1.7 | 1.7-1.9 | 1.3-1.5 | 1.5-1.7 | 1.7-1.9 |
| Cold Crushing Strength ≥/MPa | 6 | 10 | 12 | 8 | 12 | 16 | 10 | 14 | 18 |
| Thermal Conductivity Coefficient (1000℃)/[W/(m·K)] | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 |
| Permanent Linear Change (1600℃*3h)/% | -0.3~+0.3 | -0.3~+0.3 | -0.3~+0.3 | ||||||
1.Excellent Heat Insulation Performance 2.Extremely High Heat Resistance 3.Saving Energy Consumption 4.Environmental Friendliness
1.Metallurgical industry: refractory lining and insulation layer of smelting furnaces; insulation layer and furnace wall of high-temperature heat treatment furnaces; insulation layer of casting molds;
2.Chemical industry: refractory lining of reactors; insulation of petrochemical plants; insulation of high-temperature pipelines and containers; insulation layer of high-temperature gas separation equipment;
3.Electric power industry: refractory lining and insulation layer of thermal power boilers; insulation and furnace wall of gas turbines; refractory structure and insulation of nuclear power plants;