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Product introduction of mullite insulation brick
The mullite insulation brick holds a special grade of mullite (3Al2O3-2SiO2) as the main crystal phase. The content of alumina in mullite insulating bricks is 42% – 72%. The operating temperature can reach 1250 ℃ – 1600 ℃.
Features of mullite insulation brick
- High porosity.
- Small bulk density.
- Good insulation effect.
- High mechanical strength.
- The thermal conductivity is small.
Application of mullite insulation brick
Mullite insulating bricks are widely used in different types of high-temperature furnaces or kilns. For example, it is widely used in hot blast furnaces, regenerators of glass melting furnaces, ceramic kilns, blind corner linings of petroleum cracking systems, shuttle kilns, roller kilns and petrochemical combustion pits.
Parameters of mullite insulation brick
| Item | JM23 | JM26 | JM28 | JM30 |
| AL2O3(%) | 38-44 | 50-58 | 65-70 | 70-73 |
| Fe2O3(%) | 1 | 0.9 | 0.8 | 0.7 |
| Classification Temperature (℃) | 1350 | 1430 | 1540 | 1600 |
| Bulk Density (g/cm3) | 0.6-1 | 0.8-1 | 0.8-1 | 0.8-1 |
| Reheating Linear Change (%) CT-30 ℃*8h | 1250℃ -0.5 | 1400℃ -0.5 | 1500℃ -0.5 | 1550℃ -0.5 |
| Cold Crushing Strength (Mpa) | 3.0-4.5 | 3.0-4.5 | 3.0-4.5 | 3.0-4.5 |
| Modulus of Rupture (Mpa) | 1.5 | 1.7 | 1.8 | 2 |
| Thermal conductivity400℃(W/m.k) | 0.25 | 0.27 | 0.32 | 0.41 |
| Thermal Expansion1000℃(%) | 0.5 | 0.7 | 0.8 | 0.9 |