High alumina insulation bricks are also called high-alumina lightweight bricks. It is a high-performance insulation material with an Al2O3 content of more than 48%. It is also possible to add a small amount of auxiliary materials such as silica sand and rare earth elements to improve the performance of bricks. The surface contact temperature is not higher than 1400℃.
| Item/Grade | LG140-1.2 | LG140-1.0 | LG140-0.8L | LG140-0.7L | LG140-0.6L | LG140-0.5L | |
|---|---|---|---|---|---|---|---|
| ω (Al2O3)/% | μ0 ≥ | 48 | |||||
| σ | 1.0 | ||||||
| ω (Fe2O3)/% | μ0 ≤ | 2.0 | |||||
| σ | 0.3 | ||||||
| Bulk Density/(g/cm³) | μ0 ≤ | 1.2 | 1 | 0.8 | 0.7 | 0.6 | 0.5 |
| σ | 0.05 | ||||||
| Cold Crushing Strength/MPa | μ0 ≥ | 4.5 | 3.5 | 2.5 | 2.2 | 1.6 | 1.2 |
| σ | 1.0 | 0.5 | 0.2 | ||||
| Xmin | 4.0 | 3.0 | 2.2 | 2.0 | 1.5 | 1.0 | |
| Permanent Linear Change/% (T/℃*12h) | Test Temperature T/℃ | 1400 | 1350 | 1250 | |||
| Xmin~Xmax | -2~1.0 | ||||||
| Thermal Conductivity Coefficient/[W/(m·K)] ≤ Average Temperature (350±25℃) | 0.55 | 0.50 | 0.35 | 0.30 | 0.25 | 0.20 | |
1.Low thermal conductivity, effectively reducing heat transfer. 2.High refractoriness, able to withstand high – temperature environments. 3.Good thermal shock resistance, enduring temperature fluctuations. 4.Low density, easy for installation and transportation.
1.In the metallurgical industry, it is used as blast furnace lining to reduce heat dissipation and improve smelting efficiency; 2.In the power generation industry, it is used as boiler insulation to improve heat utilization; 3.In ceramic kilns, it is used to stabilize the kiln temperature and ensure the firing quality.