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Mullite Insulation Brick

Mullite insulation brick refers to a lightweight refractory brick with mullite as the main crystal phase. Generally, the alumina content is between 42% and 72%.
Mineral composition In addition to mullite, those with lower alumina content also contain glass phase and cristobalite (Si02); those with higher alumina content also contain a small amount of corundum (A1203).


  1. Low thermal conductivity, good thermal insulation effect;
  2. Mullite insulation bricks have low thermal melting, due to low thermal conductivity, mullite series lightweight insulation bricks accumulate little heat energy, and the energy saving effect is obvious in intermittent operation;
  3. Low impurity content has very low content of oxides such as iron and alkali metals, so the refractoriness is high: the higher aluminum content makes it maintain good performance under reducing atmosphere;
    Mullite insulation bricks have high thermal compressive strength;
  4. Accurate appearance and size, speed up masonry, reduce the amount of refractory mortar used, ensure the strength and stability of masonry, thereby prolonging the life of the lining;
  5. Mullite insulation bricks can be processed into special shapes. To reduce the number of bricks and joints.


AL2O3 (%)38~4450~5865~7070~73
Fe2O3 (%)
Classification Temperature (℃)1350143015401600
Bulk Density (g/cm3)0.6~10.8~10.8~10.8~1
Reheating Linear Change (%)   CT-30 ℃*8h1250℃ -0.5 1400℃ -0.51500℃ -0.51550℃ -0.5
Cold Crushing Strength (Mpa)3.0~4.5 3.0~4.5 3.0~4.53.0~4.5
Modulus of Rupture (Mpa)
Thermal conductivity400℃(W/m.k)
Thermal Expansion1000℃(%)


Mullite insulation bricks are suitable for lining of cracking furnaces, hot blast furnaces, ceramic roller kilns, electric porcelain drawer kilns, glass crucibles and various electric furnaces. Hot blast stove roof, blast furnace body and bottom, glass melting furnace regenerator, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.

Mullite Insulation Brick Products


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