Description
Mullite insulation brick is a kind of insulating brick primarily made from mullite as the main raw material, with an alumina content generally ranging from 45% to 65%. The mineral composition, in addition to mullite, includes small amounts of glass phase and quartz when the alumina content is relatively low; whereas, when the alumina content is higher, small amounts of corundum are present. This product features low thermal conductivity, low thermal expansion, low impurity content, high resistance to high temperatures, high compressive strength and excellent thermal shock resistance.Moreover, they can be processed into special shapes and in direct contact with the fire side.
Specifications
| Item | Grade | |||||||
| MG-23 | MG-25 | MG-26 | MG-27 | MG-28 | MG-30 | MG-32 | ||
| ω(Al₂O₃)/% | ≥ | 40 | 50 | 55 | 60 | 65 | 70 | 77 |
| ω(Fe₂O₃)/% | ≤ | 1.0 | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 |
| Bulk density/(g/cm³) | ≤ | 0.55 | 0.80 | 0.85 | 0.90 | 0.95 | 1.05 | 1.35 |
| CCS / MPa | ≥ | 1.0 | 1.5 | 2.0 | 2.5 | 2.5 | 3.0 | 3.5 |
| Min | 0.9 | 1.3 | 1.8 | 2.2 | 2.2 | 2.7 | 3.2 | |
| HPLC（T/℃×12h）/% | T/℃ | 1230 | 1350 | 1400 | 1450 | 1510 | 1620 | 1730 |
| λ/[W/(m·k)]≤（±25℃） | 200 | 0.18 | 0.26 | 0.28 | 0.32 | 0.35 | 0.42 | 0.56 |
| 350 | 0.20 | 0.28 | 0.30 | 0.34 | 0.37 | 0.44 | 0.60 | |
| 600 | 0.22 | 0.30 | 0.33 | 0.36 | 0.39 | 0.46 | 0.64 | |
| R.U.L. (0.2 MPa T0.6) / ℃ ≥ | 1080 | 1200 | 1250 | 1300 | 1360 | 1470 | 1570 | |
Applications
Mullite insulation brick can be used for the insulation layer of hot blast furnace tops, blast furnace bodies and bottoms, heating furnaces and annealing furnaces, etc. Used as the lining for cracking furnaces, tube-type heating furnaces, gas generators, etc. Used as the lining for ceramic roller kilns, regenerator chambers of glass melting furnaces, and ceramic sintering kilns.
