Mullite castable are used at high temperature and can be used as working lining in direct contact with flame. It is suitable for petrochemical industry tubular heating furnace, light diesel oil, ethane cracking furnace lining, normal decompression furnace, sulfur recovery device, steam boiler, turtle net heat insulation layer, two ware barrel and pipe heat insulation single layer, other industrial furnace door, watch fire hole, observation hole door lining, etc.
Mullite castables performance index
| Product Grade | MJ55 | MJ60 | MJ65 | MJ70 |
| Al2O3 content, % ≥ | 55 | 60 | 65 | 70 |
| Bulk density, g/cm3 ≥ | 2.2 | 2.3 | 2.4 | 2.5 |
| Flexural strength, MPa ≥ | 7 | 7 | 8 | 9 |
| Compressive strength, MPa ≥ | 30 | 35 | 40 | 45 |
| Linear variation(%) ≤ | ±0.5 | ±0.5 | ±0.5 | ±0.5 |
| Maximum use temperature, ℃ | 1450 | 1500 | 1550 | 1600 |
