Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Mullite Brick
Mullite Brick | High Temperature Refractory Solution with Excellent Thermal Stability and Strength
Mullite brick is a high-performance refractory material mainly composed of mullite phase, featuring excellent high-temperature strength, thermal shock resistance and chemical stability.
Compared with ordinary alumina bricks, mullite bricks provide better dimensional stability under high temperature conditions and are widely used in industrial kilns requiring long service life and reliable performance.
Parameters of Mullite Brick
| Item | MLZ-60 |
MLZ-65 |
MLZ-70 |
MLZ-75 |
|
Al₂O₃(%)≥ |
60 | 65 | 70 | 75 |
|
SiO₂(%)≤ |
35 | 33 | 26 | 24 |
|
Fe₂O₃(%)≤ |
1.0 | 1.0 | 0.6 | 0.4 |
|
Apparent porosity(%)≤ |
17 | 17 | 17 | 18 |
|
Bulk density(g/cm³)≥ |
2.55 | 2.55 | 2.55 | 2.55 |
|
Cold crushing strength(MPa)≥ |
60 | 60 | 80 | 80 |
|
Refractoriness under load, ℃(0.2MPa,0.6%)≥ |
1580 | 1600 | 1600 | 1650 |
|
Permanent Linear Change On Reheating,%(1500℃*2h) |
0～+0.4 |
0～+0.4 |
0～+0.4 |
0～+0.4 |
|
Thermal Shock Resistances 100℃ water cycles≥ |
18 | 18 | 18 | 18 |
|
Thermal Conductivity (W/MK) 1000℃ |
1.74 | 1.84 | 1.95 | 1.95 |
Product Advantage
• Excellent Thermal Shock Resistance:Mullite structure provides good resistance against rapid temperature changes, reducing cracking during heating and cooling cycles.
• High Temperature Strength:Maintains mechanical strength under continuous high-temperature operation.
• Low Thermal Expansion:Stable volume performance helps prevent deformation during long-term service.
• Good Chemical Resistance:Suitable for various industrial furnace atmospheres.
Product Application
• Glass Furnaces：Used in areas requiring resistance to high temperature and chemical corrosion.
• Heat Treatment Furnaces：Suitable for furnace linings, supports and high-temperature structures.
• Tunnel Kilns：Provide stable performance during continuous operation.
Product Process
Why Choose ZKD Refractory Mullite Brick
• Stable Production Quality：Strict control from raw material selection to firing process.
• Customized Solutions：Different grades and shapes available according to working conditions.
• Export Experience：Professional packing and international shipment service.
• Factory Direct Supply：Competitive price with reliable quality.
FAQ
Q:What temperature can mullite bricks withstand?
A:The working temperature of mullite bricks depends on the grade and application conditions. Generally, mullite bricks can be used in high-temperature environments around 1500℃-1700℃.
Q:What is the difference between mullite brick and <a href="https://www.zkdrefractories.com/e_products/High-Alumina-Brick-6-28.html">high alumina brick</a>?
A:Mullite bricks have excellent thermal shock resistance and dimensional stability at high temperatures due to their mullite crystal structure.
High alumina bricks usually have higher Al₂O₃ content and provide better resistance to certain chemical corrosion.
The right choice depends on the furnace operating conditions.
Q:Can you provide customized mullite bricks?
A:Yes. We can manufacture mullite bricks according to customer requirements, including:
• Custom sizes
• Special shapes
• Different alumina grades
• Specific application requirements
Customers can provide drawings or technical specifications for evaluation.
Q:How do you ensure mullite brick quality?
A:Our quality control includes:
• Raw material inspection
• Chemical composition testing
• Physical property testing
• Dimension inspection
• Final product inspection before shipment
Q:What is the difference between mullite brick and <a href="https://www.zkdrefractories.com/e_products/Mullite-Insulation-Brick-8-24.html">mullite insulation brick</a>?
A:Mullite brick is a dense refractory material designed for high temperature strength and durability.
Mullite insulation brick is lightweight and mainly used for thermal insulation, reducing heat loss and furnace weight.
The selection depends on whether the application requires strength or insulation performance.
