Mullite Insulation Brick
Mullite insulation brick has good thermal insulation effects. Kerui Refractory is an ISO certified manufacturer. With customized thermal design and 1600°C service capabilities, we have won the trust of more than 1,000 industrial partners in more than 50 countries around the world. Our product quality has also passed strict third-party certification.
- Free Sample:
- Available
- Document:
- Certificates Supporting
- Performance Test:
- Support
- Shipment:
- 7-35 working days
Common Grades of Mullite Insulation Bricks
In addition to the regular JM series, Keru also provides B grades, C grades and other grades of insulation bricks.
- JM series: JM23, JM26, JM28, JM30;
- B series: B4, B5, B7;
- C series: C1, C2;
Quality Production of Kerui Mullite Insulation Bricks
Selected Raw Materials
Mullite bricks are insulating bricks made primarily from quality mullite. Mullite is a mineral compound composed mainly of aluminum oxide and silicon dioxide. Small amounts of glass phase, cristobalite, and corundum are also part of its composition. This brick has a unique crystal structure, with aluminum oxide content ranging between 70-78%. It has low impurity content. So, it is a popular choice for raw materials in high-temperature industries.
Quality Production
After firing, the aluminum oxide content in mullite insulation bricks ranges from 42-72%. Its main components include mullite, additives, and others. Mullite insulation bricks exhibit excellent properties such as resistance to acid and alkali erosion, low thermal conductivity, uniform expansion, and so on. Additionally, these insulation bricks have good workability and plasticity. These features enhance convenience in transportation and construction processes.
Video of Kerui Mullite Insulation Brick
This video gives you a comprehensive understanding of Kerui’s mullite insulation bricks. First, its appearance and texture are shown up close. Then, you will walk into the production workshop and see how the workers operate. The entire process is a mature and reliable conventional process, focusing on quality control at every step.
Properties of Mullite Insulating Bricks
High Refractoriness
The mullite insulating brick has a high refractoriness, reaching up to 1600 degrees Celsius. The load softening temperature is approximately 1230-1600 degrees Celsius. It is suitable for use in high-temperature environments and has a long service life.
Low Thermal Fusion
Insulation brick features low thermal fusion, low thermal conductivity, and light weight. These features provide effective thermal insulation to help maintain furnace temperatures and significantly reduce the structural load of the kiln.
Low Creep at High Temperatures
Mullite insulating bricks have high strength, low creep at high temperatures, and good thermal shock stability. They exhibit strong volume stability at high temperatures. And they can maintain a stable structure during rapid temperature changes.
Strong Chemical Resistance
This type of brick has extremely strong resistance to acid and alkali erosion. It will not corrode or damage when used in acidic or alkaline working environments. This helps reduce slag formation at high temperatures.
Environmental Friendly
The mullite is a tasteless, non-toxic, eco-friendly material composed of natural ingredients without harmful substances. It does not emit harmful gases at high temperatures during use, helping to reduce pollution and waste.
Low Impurity Content
Mullite insulating bricks have high purity and low impurity content. This factor results in stable performance and durability. This brick reduce low melting point impurities to improve refractoriness.
Mullite Insulating Bricks VS. Mullite Refractory Bricks
| Property | Mullite Insulation Brick | Mullite Refractory Brick |
| Additives | Hollow microspheres, perlite (reduce density) | Al₂O₃, ZrSiO₄, FeCr₂O₄ (enhance high-temp performance) |
| Porosity | High (50%-80%), porous | Low (≤20%), dense |
| Density | 0.55-1.1 g/cm³ (lightweight) | 2.6-2.7 g/cm³ (high density) |
| Refractoriness | 1600°C | 1680°C |
| Thermal Conductivity | 0.17-0.43 W/m·K (very low) | 1.5-2.5 W/m·K (relatively high) |
| Thermal Shock Resistance | Moderate (porous structure may crack) | Excellent (withstands rapid thermal cycling) |
| Advantages | • Energy-saving • Lightweight • Reduces load |
• High temp resistance • Corrosion resistance • Structural stability |
| Typical Applications | • Furnace insulation • Pipeline insulation |
• High-temp furnace linings (glass, cement) • Direct flame/melt contact |
Industrial Implementation Scenarios of Kerui Mullite Bricks
Steel Smelting Industry
The mullite insulation brick in the steel metallurgy industry is mainly used to reduce heat loss in high-temperature environments. It is commonly used in the construction of hot blast stoves, blast furnaces, annealing furnaces, resistance furnaces, aluminum reduction cells, and insulation furnaces.
High-Temperature Industrial Kiln
In the building materials industry, there is a high demand for mullite insulation bricks to maintain temperature and corrosion resistance. They are used in glass melting furnaces, glass heat storage chambers, cement kilns, rotary kilns, bell kilns, ceramic sintering kilns, high-temperature ceramic furnaces, and so on.
Petrochemical Industry
In the petrochemical industry, mullite bricks improve energy efficiency. They are used in petroleum fractionation furnaces, ethylene pyrolysis furnaces, pyrolysis furnaces, conversion furnaces, heating equipment, petrochemical combustion pits, and other equipment.
Power Generation Industry
In the power generation industry, mullite insulation bricks are widely used in boilers, furnaces, incinerators, and so on. They enhance the insulation and efficiency of power generation equipment. And they improve the overall performance of the industry’s equipment.
Packaging Upgrade of Kerui Mullite Insulation Bricks
Kerui has upgraded the packaging of insulation bricks, and the main benefits are as follows:
- Prevents loosening and collapsing stacks: The reinforcement strips tightly secure the bricks. They reduce the risk of damage by preventing packaging loosening or stack collapses during transport vibrations and bumps.
- Suitable for long-distance transport: This is especially ideal for high-vibration scenarios like sea freight and railway shipping. It maintains packaging integrity.
- Reduces edge wear: Insulation brick edges are fragile. The reinforcement strips avoid damage from friction and impacts.
- Unitized organization: The secured packaging allows easier stacking. It saves storage and transportation space, lowering logistics costs.
- Customized package: We can customize the packaging logo and materials according to customer requirements.
Kerui Mullite Insultion Bricks is Trusted by Global Industry Leaders
Partners across 50+ countries, including RUSAL, CHALCO, ALBA, POSCO, and PSM, choose Kerui for reliable performance, demonstrating strong recognition and fostering long-term partnerships. View some videos on YouTube.
Specification Data of Kerui Mullite Bricks
Kerui Refractory offers four grades of mullite insulation bricks, including JM-23 (KR-23), JM-26 (KR-26), JM-28 (KR-28), and JM-30 (KR-30).
In addition, kerui refractory also provides B and C series insulation bricks. Please contact us for more details.
KR/JM23 Mullite Brick
| Item/Grade | KR-23 | |||
|---|---|---|---|---|
| Type | A | B | C | D |
| Al2O3, % | ≥42 | ≥42 | ≥45 | ≥48 |
| Fe2O3, % | ≤1.2 | ≤1.2 | ≤1.0 | ≤1.0 |
| Bulk Density, g/cm³ | 0.55 | 0.6 | 0.8 | 1.00 |
| Reheating Linear Change, % | ≤-0.5 | ≤-0.55 | ≤-0.4 | ≤-0.3 |
| Temperature*12h | 1230℃ | 1260℃ | 1300℃ | 1300℃ |
| Cold Crushing Strength, MPa | ≥1.2 | ≥1.5 | ≥2.3 | ≥3 |
| Thermal Conductivity 350℃, W/(m·K) | 0.17 | 0.19 | 0.24 | 0.31 |
KR/JM26 Mullite Brick
| Item/Grade | KR-26 | |||
|---|---|---|---|---|
| Type | A | B | C | D |
| Al2O3, % | ≥54 | ≥55 | ≥56 | ≥56 |
| Fe2O3, % | ≤0.9 | ≤0.9 | ≤1.0 | ≤1.0 |
| Bulk Density, g/cm³ | 0.7 | 0.8 | 0.9 | 1.0 |
| Reheating Linear Change, % | ≤-1 | ≤-0.65 | ≤-0.5 | ≤-0.5 |
| Temperature*12h | 1400℃ | |||
| Cold Crushing Strength, MPa | ≥2 | ≥2.3 | ≥2.8 | ≥3.2 |
| Thermal Conductivity 350℃, W/(m·K) | 0.21 | 0.25 | 0.3 | 0.32 |
KR/JM28 & KR/JM30 Mullite Brick
| Item/Grade | KR-28 | KR-30 | |||
|---|---|---|---|---|---|
| Type | A | B | C | A | B |
| Al2O3, % | ≥64 | ≥65 | ≥66 | ≥72 | ≥72 |
| Fe2O3, % | ≤0.75 | ≤0.65 | ≤0.65 | ≤0.55 | ≤0.55 |
| Bulk Density, g/cm³ | 0.8 | 0.9 | 1.0 | 1.0 | 1.1 |
| Reheating Linear Change, % | ≤-1 | ≤-0.8 | ≤-0.7 | ≤-0.9 | ≤-0.7 |
| Temperature*12h | 1500℃ | 1600℃ | |||
| Cold Crushing Strength, MPa | ≥2.3 | ≥2.8 | ≥3.3 | ≥3.0 | ≥3.5 |
| Thermal Conductivity 350℃, W/(m·K) | 0.28 | 0.32 | 0.34 | 0.4 | 0.43 |
Kerui Refractory is Your Ideal Expert
Kerui Refractory’s mullite insulation bricks are multifunctional. And they have a long lifespan. When you choose our products, you are not just investing in mullite insulation bricks, but also in quality assurance and peace of mind service. Kerui Refractory provides you with the most suitable insulation bricks and insulation solutions. Please send us your detailed requirements now.
