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Premium Lightweight Alumina Bubble Brick from China Suppliers | High-Temperature Refractory Factory
Core Advantages
Superior Thermal Insulation Performance
The unique hollow sphere structure minimizes thermal conductivity, effectively reducing heat loss in high-temperature equipment. Compared to traditional refractory bricks, cutting operational costs significantly.
Lightweight & High Strength
With low bulk density (1.4–1.7 g/cm³), it eases equipment load and simplifies installation. Meanwhile, high alumina purity ensures excellent mechanical strength and wear resistance, avoiding cracking under extreme temperature changes.
Exceptional High-Temp Stability
Made of high-purity alumina (Al₂O₃ ≥90%), it can withstand continuous temperatures up to 1800°C and resist corrosion from molten metal, slag, and chemical media, extending the service life of furnace linings.
Product Parameters
| Item | Alumina Bubble Brick | ||
|---|---|---|---|
| Al₂O₃ Grade | ≥85% | ≥90% | ≥99% |
| Al₂O₃ % | ≥85 | ≥90 | ≥99 |
| Fe₂O₃ % | ≤0.20 | ≤0.20 | ≤0.20 |
| Bulk Density (g/cm³) | 1.4–1.7 | 1.4–1.7 | 1.4–1.7 |
| Cold Crushing Strength (MPa) | ≥12 | ≥10 | ≥9 |
| Refractoriness Under Load (℃) (0.2 MPa, 0.6%) |
≥1650 | ≥1700 | ≥1700 |
| Permanent Linear Change 1600℃ × 3h |
±0.3 | ±0.3 | ±0.3 |
| Coefficient of Thermal Expansion (Room Temp – 1300℃) |
~7.8 | ~0.8 | ~8.6 |
| Thermal Conductivity | ≤0.80 | ≤1.30 | ≤1.50 |
Detailed Application Scenarios
1
Metallurgical Industry
◎ Widely used in lining of blast furnace hot blast stoves, electric arc furnaces, and ladle tundishes. It resists high-temperature erosion from molten steel and slag, improves thermal insulation effect, and ensures stable production of metallurgical equipment.
2
Ceramic & Glass Industry
◎ Suitable for kiln linings in ceramic tile, sanitary ware, and glass melting furnaces. Its excellent thermal insulation reduces heat loss during firing, maintains uniform furnace temperature, and enhances product quality while saving energy.
3
Petrochemical Industry
◎ Applied in linings of catalytic cracking units, reforming furnaces, and hydrogenation reactors. It withstands high temperatures and chemical corrosion, ensures safe operation of equipment, and extends maintenance cycles.
4
Other High-Temp Equipment
◎ Also used in waste incinerators, industrial boilers, and solar thermal power generation equipment. It adapts to complex high-temperature environments, improves equipment efficiency, and reduces environmental pollution.
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 operating temperature of Alumina Bubble Brick?
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Alumina Bubble Brick can withstand continuous operating temperatures of up to 1800°C. Thanks to its high-purity alumina content (Al₂O₃ ≥90%), it maintains structural integrity and excellent thermal insulation performance even under extreme, sustained heat conditions.
What Al₂O₃ grades are available for Alumina Bubble Brick?
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We offer three standard grades of Alumina Bubble Brick: ≥85% Al₂O₃, ≥90% Al₂O₃, and ≥99% Al₂O₃. Each grade is engineered to meet different performance requirements in terms of refractoriness, thermal conductivity, and cold crushing strength.
How does Alumina Bubble Brick reduce energy consumption in industrial furnaces?
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The unique hollow sphere microstructure of Alumina Bubble Brick creates numerous air pockets that significantly reduce thermal conductivity (as low as ≤0.80 W/m·K for the ≥85% grade). This minimizes heat loss through furnace walls, allowing equipment to maintain target temperatures with less energy input, directly lowering operational fuel or electricity costs.
Is Alumina Bubble Brick resistant to chemical corrosion from molten metal and slag?
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Yes. Alumina Bubble Brick demonstrates excellent resistance to corrosion from molten metals, slag, and various chemical media. Its high alumina purity provides a chemically stable matrix that withstands attack in metallurgical, petrochemical, and glass industry environments, significantly extending the service life of furnace linings.
What industries commonly use Alumina Bubble Brick?
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Alumina Bubble Brick is widely used across multiple high-temperature industries, including: the metallurgical industry (blast furnaces, electric arc furnaces, ladle tundishes), the ceramic and glass industry (kiln linings, glass melting furnaces), the petrochemical industry (catalytic cracking units, reforming furnaces, hydrogenation reactors), and other applications such as waste incinerators, industrial boilers, and solar thermal power generation systems.
What is the bulk density of Alumina Bubble Brick and why does it matter?
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The bulk density of Alumina Bubble Brick ranges from 1.4 to 1.7 g/cm³ across all three Al₂O₃ grades. This low bulk density is a key advantage — it reduces the structural load on furnaces and industrial equipment, simplifies installation, and lowers transportation costs, while still delivering high mechanical strength (cold crushing strength ≥9–12 MPa) and wear resistance.