Mullite insulating brick Low thermal conductivity, high temperature resistant, can be in direct contact with flames for long term use. Used for linings and insulation layers of kilns in glass, metallurgy and other industries.
Mullite Insulating Bricks are refractory materials with mullite as the main crystalline phase, containing a small amount of corundum, glass phase, etc. They are formed by the ball-milling and casting method or the vacuum extrusion method and then made through high-temperature calcination. They are suitable for the thermal insulation and lining of high-temperature industrial kilns.
Features and Properties
| Item/Grade | JM-23 | JM-26 | JM-28 | JM-30 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ω (Al2O3)/% | 42 | 45 | 48 | 54 | 55 | 56 | 56 | 64 | 65 | 66 | 72 | 72 |
| ω (Fe2O3)/% | 1.2 | 1.0 | 1.0 | 0.9 | 0.8 | 1.0 | 1.0 | 0.75 | 0.65 | 0.65 | 0.55 | 0.55 |
| Bulk Density (g/cm³) | 0.6 | 0.8 | 1.0 | 0.7 | 0.8 | 0.9 | 1.0 | 0.8 | 0.8 | 1.0 | 1.0 | 1.1 |
| Cold Crushing Strength/MPa | 1.5 | 2.3 | 3.0 | 2.0 | 2.3 | 2.8 | 3.2 | 2.3 | 2.8 | 3.3 | 3.0 | 3.5 |
| Permanent Linear Change/% | -0.55 | -0.4 | -0.3 | -1.0 | -0.65 | -0.5 | -0.5 | -1.0 | -0.8 | -0.7 | -0.9 | -0.7 |
| 1260℃×12h | 1300℃×12h | 1300℃×12h | 1400℃×12h | 1400℃×12h | 1400℃×12h | 1400℃×12h | 1500℃×12h | 1500℃×12h | 1500℃×12h | 1600℃×12h | 1600℃×12h | |
| Thermal Conductivity 350℃ ≤/[W/(m·K)] | 0.19 | 0.24 | 0.31 | 0.21 | 0.25 | 0.30 | 0.32 | 0.28 | 0.32 | 0.34 | 0.40 | 0.43 |
SiO₂:91%;
Bulk Density:0.8-1.2g/cm³;
Thermal Conductivity :0.26-0.35;
Al₂O₃:90-99%;
Bulk Density:1.35-1.70g/cm³;
Cold Crushing Strength:8-20MPa;
Al₂O₃:≥48%;
Bulk Density:0.6-1.2g/cm³;
Thermal Conductivity :0.25-0.50;
Bulk Density:0.6-1.3g/cm³;
Thermal Conductivity:0.25-0.55;
Cold Crushing Strength:1.5-8MPa;
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