Mullite bricks are a high aluminum refractory with mullite as the main crystal phase. Generally, the content of alumina is between 65% and 75%. In addition to mullite, the minerals with lower alumina content also contain a small amount of vitreous phase and cristobalite. The higher alumina content also contains a small amount of corundum. It is mainly used for hot blast stove top, blast furnace body and bottom, glass furnace regenerator, ceramic kiln, dead corner lining of petroleum cracking system, etc.
| INDEX PRODUCT | Three low mullite | Beached mo lai stone | electric smelting mullite | ||||
| RBTM-47 | RBTM-65 | RBTM-70 | RBT-M75 | RBTM-80 | RBTFM-75 | ||
| Refractoriness（℃） ≥ | 1790 | 1790 | 1790 | 1790 | 1810 | 1810 | |
| Bulk Density（g/cm3） ≥ | 2.42 | 2.45 | 2.50 | 2.60 | 2.70 | 2.70 | |
| Apparent Porosity（%） ≤ | 12 | 18 | 18 | 17 | 17 | 16 | |
| cold crushing strength ≥
Cold Crushing Strength（MPa） |
60 | 60 | 70 | 80 | 85 | 90 | |
| Permanent Linear Change | 1400°×2h | +0.1
-0.1 |
|||||
| 1500°×2h | +0.1
-0.4 |
+0.1
-0.4 |
+0.1
-0.4 |
+0.1
-0.4 |
±0.1 | ||
| @0.2MPa ≥Refractoriness Under Load（℃） | 1520 | 1580 | 1600 | 1600 | 1620 | 1700 | |
| @0.2MPa 1200°×2hCreep Rate（%） ≤ | 0.1 | ― | ― | ― | ― | ― | |
| Al2O3（%） ≥ | 47 | 64 | 68 | 72 | 78 | 75 | |
| Fe2O3（%） ≤ | 1.2 | 0.8 | 0.8 | 0.7 | 0.7 | 0.5 | |