Mullite Refractory Bricks are high-temperature ceramic bricks made from high-purity mullite, offering excellent thermal shock resistance, low thermal conductivity, and superior strength.
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info@rsrefractories.comMullite Refractory Bricks are engineered using high-purity mullite minerals or synthesized mullite produced through controlled firing processes. With their exceptional combination of high melting point, low thermal expansion, and superior chemical stability, these bricks provide outstanding resistance to high temperatures, thermal shock, and acidic or neutral slags. Mullite bricks have a dense structure and excellent mechanical strength, ensuring long service life in demanding industrial applications. They are widely used in furnace linings where both insulation efficiency and structural durability are required.
| Items | MU 65 | MU 70 | MU 75 | |
| Chemical Composition | Al2O3 % | ≥65 | ≥70 | ≥75 |
| SiO2 % | ≤33 | ≤26 | ≤24 | |
| Fe2O3 % | ≤1.0 | ≤0.6 | ≤0.4 | |
| Bulk Density g/cm3 | ≥2.55 | ≥2.55 | ≥2.55 | |
| Reheating Linear Change (%) 1500℃×2h | 0~+0.4 | 0~+0.4 | 0~+0.4 | |
| Apparent Porosity % | ≤17 | ≤17 | ≤18 | |
| Thermal Conductivity W/(m·K) 1000℃ | 1.84 | 1.95 | 1.95 | |
| Cold Crushing Strength MPa | ≥60 | ≥80 | ≥80 | |
| Thermal Expansion Coefficient (×10-6℃-1) | 0.6 | 0.6 | 0.55 | |
| 0.2Mpa Refractoriness Under Load T0.6 ℃ | ≥1600 | ≥1600 | ≥1650 | |
| Thermal Shock Resistance 1000℃ water cycles | ≥18 | ≥18 | ≥18 | |
Mullite Refractory Bricks are used in:
Hot blast stoves
Ceramic kilns and tunnel kilns
Glass furnaces and regenerator chambers
Petrochemical heaters and incinerators
High-temperature insulation zones requiring low thermal conductivity
Comprehensive Refractory Product Range
We manufacture 3 main types of refractory materials — refractory castables, high alumina cement, and refractory bricks — covering 100+ industrial furnace types worldwide.
Certified Quality and International Standards Compliance
All batches undergo strict quality control. Products comply with ISO, ASTM, and GB standards, ensuring reliable performance in high-temperature industrial applications.
Annual Production Capacity of 130,000 Tons
With a large-scale capacity of 130,000 tons per year, we guarantee stable supply and on-time delivery for long-term and large-volume projects.
Exported to 120+ Countries and 1,000+ Projects
Our products have been successfully delivered to over 120 countries, supporting more than 1,000 industrial projects, including cement, steel, incineration, glass, and petrochemical furnaces.
20+ Years of Experience in Refractory Manufacturing
With over 20 years of experience, we understand real furnace conditions and deliver materials proven in long-term industrial operations worldwide.
Professional Technical Support and Free Samples
We provide technical assistance from material selection to installation guidance, with free samples available for testing and supporting 1,000+ projects globally.
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