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China Suppliers Factory High-Quality Mullite Bricks with Exceptional Thermal Shock Resistance for Industrial Furnaces
Core Advantages
Exceptional High-Temperature Stability
With refractoriness up to 1790℃ and load softening temperature 1600–1700℃, they maintain structural integrity under extreme heat, ensuring long service life.
Superior Thermal Shock Resistance
Resisting cracking from rapid temperature changes, suitable for intermittent operation furnaces.
Strong Corrosion & Wear Resistance
Resists most acid slags, chemical attack, and oxidation, with high cold crushing strength (70–260 MPa) for erosion-prone environments.
Low Thermal Conductivity
Reduces heat loss, improving energy efficiency of industrial kilns while ensuring stable temperature distribution.
Customizable Specifications
Available in sintered/fused cast types and various sizes, tailored to specific furnace structures and working conditions.
Product Parameters
| Item | Sintered Mullite Brick | ||
| Al₂O₃ % | ≥75–80 | ≥72–75 | ≥70 |
| Fe₂O₃ % | ≤1.2 | ≤1.2 | ≤2.0 |
| Bulk Density (g/cm³) | ≥2.70 | ≥2.65 | ≥2.65 |
| Apparent Porosity (%) | ≤18 | ≤19 | ≤20 |
| Cold Crushing Strength (MPa) | ≥90 | ≥90 | ≥70 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1650 | ≥1650 | ≥1530 |
| Creep Rate — 0.2MPa (1400℃×50h) % | ≤0.8 | ≤0.8 | ≤0.8 |
Detailed Application Scenarios
1
Metallurgy Industry
◎ Applied in hot blast furnace roofs, blast furnace stacks and bottoms, torpedo tanker slag line areas, and hot air channel hanging parts. Resists iron liquid scouring and high-temperature furnace atmospheres, ensuring stable operation of metallurgical equipment.
2
Petrochemical Industry
◎ Suitable for slag gasification furnaces, synthetic ammonia conversion furnaces, carbon black reactors, and cracking furnace linings. Withstands chemical corrosion from reaction media and high-temperature creep, extending furnace service life.
3
Glass & Ceramic Industry
◎ Used in glass melting furnace regenerative chambers, clarification tank walls, ceramic tunnel kilns, roller kilns, and kiln furniture. Features low thermal conductivity and excellent thermal stability, adapting to continuous high-temperature working conditions.
4
Building Materials & Other Industries
◎ Ideal for rotary cement kilns, lime kiln inner linings, heat treatment furnaces, and resistance furnaces. Available as lightweight insulation bricks for backing linings and standard bricks for fire-facing surfaces, meeting diverse insulation and load-bearing needs.
5
Product Type
◎ Sintered Mullite Bricks: Cost-effective with balanced performance, suitable for general high-temperature kiln linings like ceramic kilns and hot blast stoves.
◎ Fused Cast Mullite Bricks: Higher purity and density, superior erosion resistance, ideal for harsh environments like glass kiln key parts and acid slag contact areas.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
What is the maximum service temperature of mullite bricks?
Mullite bricks have a refractoriness of up to 1790℃, with a load softening temperature ranging from 1600℃ to 1700℃, making them suitable for extremely high-temperature industrial applications such as blast furnaces and glass melting kilns.
What is the difference between sintered and fused cast mullite bricks?
Sintered mullite bricks are cost-effective and offer balanced performance for general high-temperature kiln linings. Fused cast mullite bricks feature higher purity and density with superior erosion resistance, making them ideal for harsher environments such as glass kiln key parts and acid slag contact areas.
Which industries are mullite bricks most commonly used in?
Mullite bricks are widely used across metallurgy, petrochemical, glass & ceramic, and building materials industries. Typical applications include blast furnace stacks, cracking furnace linings, glass melting furnace regenerative chambers, and rotary cement kiln linings.
What Al₂O₃ content levels are available in your mullite bricks?
Our sintered mullite bricks are available in three Al₂O₃ content grades: ≥75–80%, ≥72–75%, and ≥70%, allowing customers to select the appropriate grade based on their specific temperature and chemical resistance requirements.
Can mullite bricks be customized to fit specific furnace structures?
Yes. We offer customizable specifications for both sintered and fused cast mullite bricks. Various sizes and shapes can be tailored to match specific furnace structures and working conditions, including lightweight insulation versions for backing linings.
How do mullite bricks improve energy efficiency in industrial kilns?
Thanks to their low thermal conductivity, mullite bricks significantly reduce heat loss through kiln walls. This helps maintain stable temperature distribution throughout the kiln, lowers fuel consumption, and improves the overall energy efficiency of industrial heating equipment.