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Mullite insulation brick is made of high-alumina bauxite clinker as the main material, plus a small amount of clay or raw bauxite as a binder, and then shaped and sintered at high temperatures.

mullite insulation brick
mullite insulation brick

Mullite refractory bricks are also called lightweight mullite brick and mullite thermal insulation brick, Mullite insulation brick is a high-alumina refractory material with mullite (3Al2O3·2SiO2) as the main crystal phase. Generally, the alumina content is between 40% and 75%. Those with lower aluminum content also contain a small amount of glass phase and cristobalite, and those with higher alumina content also contain a small amount of corundum.

refractory brick

Mullite insulation brick parameters

JM23 JM26 JM28 JM30 bricks
JM23 JM26 JM28 JM30 bricks

Physical and chemical indicators:

Al2O3  %≥40≥50≥55≥60
Fe2O3  %≤1.0≤1.0≤0.9≤0.8
Apparent porosity  %≤0.55≤0.80≤0.85≤0.9
Cold Crush Strength  MPa≥1.0≥1.5≥2.0≥2.5
Permanent Linear Change Rate %1230℃×12h1350℃×12h1400℃×12h1450℃×12h
Thermal Conductivity
0.05MPa Refractoriness Under LoadT0.5 ℃≥1080≥1200≥1250≥1300
Al2O3  %≥65≥70≥77
Fe2O3  %≤0.7≤0.6≤0.5
Apparent porosity  %≤0.95≤1.05≤1.35
Cold Crush Strength  MPa≥2.5≥3.0≥3.5
Permanent Linear Change Rate %1510℃×12h1620℃×12h1730℃×12h
Thermal Conductivity W/(m·K)200±25℃≤0.35≤0.42≤0.56
0.05MPa Refractoriness Under Load T0.5 ℃≥1360≥1470≥1570
refractory mullite brick

Mullite insulation brick advantages

jm brick
jm brick
  1. Low heat fusion
  2. Low thermal conductivity
  3. High refractoriness
  4. Good chemical stability
  5. High compressive and flexural strength
  6. Accurate appearance and size

Mullite insulating brick application

mullite insulation brick
mullite bricks

Mullite insulating bricks are suitable for lining cracking furnaces, hot blast furnaces, ceramic roller kilns, electric porcelain drawer kilns, glass crucibles, and various electric furnaces. It is used for the roof of the hot blast stove, furnace body and bottom of blast furnaces, regenerator of glass melting furnaces, ceramic sintering kiln, furnace lining of petroleum cracking system, etc. Mullite insulation bricks also have the characteristics of high load softening temperature, compact structure, low porosity, and good erosion resistance.

Mullite insulation brick refractories company

refractories company
refractories company

Insulating fire bricks success case

The refractory bricks of Rongsheng Refractories Co., Ltd. have been sold to more than 80 countries, including Russia, Uzbekistan, Ecuador, Chile, South Africa, Portugal, and other places. Customers are very satisfied with this mullite JM brick.

Insulating fire bricks
Insulating fire bricks

FAQ of mullite refractory bricks

mullite bricks manufacturers
mullite bricks manufacturers
What is the operating temperature range of mullite refractory bricks?

The operating temperature range of mullite insulation bricks is generally 1000°C-1650°C, and can be customized according to specific use requirements.

Can the size and shape be customized?

Yes, Support customization.

What are the precautions for storage and transportation?

Store in a dry and ventilated warehouse to avoid moisture. During transportation, care should be taken to avoid severe vibration and collision to avoid damage.

Contact us

    About Rongsheng Group

    About Rongsheng Group

    Rongsheng is a refractory exporter with 10 years of export experience. We have rich experience in refractory products and can provide customers with a complete set of kiln refractory usage solutions. Mullite insulation bricks are very popular refractory materials, and high alumina bricks, corundum bricks and magnesia carbon bricks are also popular products.


    mullite refractory bricks shipping

    mullite refractory bricks shipping

    The production time and transportation time are generally about 7-12 days, but this is related to the quantity ordered, but it will definitely be delivered according to the time stipulated in the contract. For details, please contact us.

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