Mullite Insulation Brick
Application:
Suitable for the refractory lining and backing insulation layer of pyrolysis furnaces, hot blast furnaces, ceramic roller kilns, electric porcelain drawer kilns and various industrial resistance furnaces.
Technical Data:
| Item/Grade | KR – 23 | ||||
|---|---|---|---|---|---|
| Type | A | B | C | D | |
| Al₂O₃, % | ≥ | 42 | 42 | 45 | 48 |
| Fe₂O₃, % | ≤ | 1.2 | 1.2 | 1 | 1 |
| Bulk Density, g/cm³ | 0.55 | 0.6 | 0.8 | 1.0 | |
| Reheating Linear Change, % | ≤ | -0.5 (1230°C×12h) | -0.55 (1260°C×12h) | -0.4 (1300°C×12h) | -0.3 (1300°C×12h) |
| Cold Compression Strength, MPa | ≥ | 1.2 | 1.5 | 2.3 | 3 |
| Thermal conductivity 350 °C, W/(m·K) | 0.17 | 0.19 | 0.24 | 0.31 |
| Item/Grade | KR – 26 | ||||
|---|---|---|---|---|---|
| Type | A | B | C | D | |
| Al₂O₃, % | ≥ | 54 | 55 | 56 | 56 |
| Fe₂O₃, % | ≤ | 0.9 | 0.9 | 1 | 1 |
| Bulk Density, g/cm³ | 0.7 | 0.8 | 0.9 | 1.0 | |
| Reheating Linear Change, % | ≤ | -1 (1400°C×12h) | -0.65 (1400°C×12h) | -0.5 (1400°C×12h) | -0.5 (1400°C×12h) |
| Cold Compression Strength, MPa | ≥ | 2 | 2.3 | 2.8 | 3.2 |
| Thermal conductivity 350 °C, W/(m·K) | 0.21 | 0.25 | 0.3 | 0.32 |
| Item/Grade | KR – 28 | KR – 30 | ||||
|---|---|---|---|---|---|---|
| Type | A | B | C | A | B | |
| Al₂O₃, % | ≥ | 64 | 65 | 66 | 72 | 72 |
| Fe₂O₃, % | ≤ | 0.75 | 0.65 | 0.65 | 0.55 | 0.55 |
| Bulk Density, g/cm³ | 0.8 | 0.9 | 1.0 | 1.0 | 1.1 | |
| Reheating Linear Change, % | ≤ | -1 (1500°C×12h) | -0.8 (1500°C×12h) | -0.7 (1500°C×12h) | -0.9 (1600°C×12h) | -0.7 (1600°C×12h) |
| Cold Compression Strength, MPa | ≥ | 2.3 | 2.8 | 3.3 | 3.0 | 3.5 |
| Thermal conductivity 350 °C, W/(m·K) | 0.28 | 0.32 | 0.34 | 0.4 | 0.43 |
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