General description

Linght weight mullite bricks are high alumina refractories with mullite (3Al2O3·2SiO2) as the main crystal phase.

Generally, the alumina content is between 65% and 75%, and the refractory of mullite brick is relatively high, reaching above 1790 ℃. The starting temperature of load softening is 1600 ~ 1700 ℃. Good thermal shock resistance.

There are two kinds of sintered mullite bricks and fused mullite bricks. Standard size 230 x 114 x 65 mm or according to customer requirements.

Different processes of Sintered Mullite Brick and Fusion Cast Mullite Brick

Sintered Mullite Brick processes

Sintered Mullite Brick is made of bauxite chamotte as the main raw material by adding little clay or raw bauxite as the binding agent through molding and firing.

Fusion Cast Mullite Brick processes

Fusion Cast Mullite Brick is produced with high bauxite, commercial alumina and fireclay as the raw materials by adding wood carbon or coke particle as the reducing agent after molding with electric melting method.


Standard size 230 x 114 x 65 mm, we also accept customized sizes.

Performance parameters

Mullite refractory have advantages of low level impurities, excellent volume stability and high resistance to loading in high temperatures. Mullite refractories are suitable for use in electric furnace roofs, blast furnaces and the superstructure of glass tank furnaces.

Al2O3 %≥40≥50≥55≥60≥65≥70≥77
Fe2O3 %≤1.0≤1.0≤0.9≤0.8≤0.7≤0.6≤0.5
Bulk Density, g/%%m3≤0.55≤0.80≤0.85≤0.9≤0.95≤1.05≤1.35
CCS, MPa≥1.0≥1.5≥2.0≥2.5≥2.5≥3.0≥3.5
PLC, %1230℃×12h1350℃×12h1400℃×12h1450℃×12h1510℃×12h1620℃×12h1730℃×12h
Thermal Conductivity, W/(m·K)200±25℃≤0.18≤0.26≤0.28≤0.35≤0.35≤0.42≤0.56
0.05MPa RUL, T0.5 ℃≥1080≥1200≥1250≥1300≥1360≥1470≥1570

According to the chemical structure of light weight mullite bricks, its outstanding performance is as follows:

  1. Low heat melting, due to low thermal conductivity, mullite series light insulation bricks accumulate very little heat energy, and have obvious energy saving effect in intermittent operation;
  2. Low thermal conductivity, with good thermal insulation effect;
  3. High refractoriness. Low impurity content, with very low content of iron box alkali metal and other oxides, therefore, high refractoriness; higher aluminum content makes it still maintain good performance under reducing atmosphere;
  4. High hot compressive strength
  5. Хорошая устойчивость к термическому удару
  6. Strong acid erosion resistance
  7. High high-temperature strength
  8. Great wear resistance
  9. Low thermal expansion coefficient
  10. High thermal conductivit
  11. Can be processed into special shapes, to reduce the number of bricks and joints;
  12. Accurate appearance size, speed up the masonry speed, reduce the use of refractory cement, ensure the strength and stability of the masonry, and thus extend the life of the lining.


Lightweight Mullite Brick applies to all kinds of industry furnace hot-face lined and backing lining in metallurgical industry, petrochemical industry, building materials industry, ceramic industry, and mechanical industry. Such as cracking furnace, conversion furnace, heating equipment, refine equipment, regeneration device, hot blast stove, soaking pit furnace, heat treatment furnace, resistance furnace, tunnel kiln, roller kiln, bell kiln and glass melting furnace and etc.

Mullite Bricks Supplier

Sunshine has more than 12 years of experience in the high temperature heating industry. We provide you with high quality sintered mullite bricks, fused cast mullite bricks, corundum mullite bricks, lightweight mullite bricks and etc at reasonable prices.

Contact us for pricing and you’ll also get discounts.