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China Alumina Bubble Brick - Lightweight Refractory Material from Reliable Suppliers and Factory for Industrial Furnaces
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 (℃) (0.2MPa, 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
Q
What is the maximum operating temperature of Alumina Bubble Brick?
Alumina Bubble Brick can withstand continuous operating temperatures up to 1800°C. Made from high-purity alumina (Al₂O₃ ≥90%), it maintains structural integrity and thermal insulation performance even under extreme and prolonged high-temperature conditions.
Q
What are the available Al₂O₃ purity grades for Alumina Bubble Brick?
We offer three standard purity grades: ≥85%, ≥90%, and ≥99% Al₂O₃. Each grade is designed to suit different application requirements, with higher purity grades providing superior refractoriness, chemical resistance, and high-temperature stability.
Q
How does Alumina Bubble Brick compare to traditional refractory bricks in terms of energy savings?
Thanks to its unique hollow sphere microstructure, Alumina Bubble Brick has significantly lower thermal conductivity (≤0.80–1.50 W/m·K depending on grade) compared to conventional dense refractory bricks. This translates to reduced heat loss, lower fuel consumption, and measurable operational cost savings in industrial furnaces and kilns.
Q
Which industries are best suited for Alumina Bubble Brick applications?
Alumina Bubble Brick is widely used across multiple high-temperature industries, including metallurgy (blast furnaces, electric arc furnaces, ladle tundishes), ceramics and glass manufacturing (kiln linings), petrochemical processing (catalytic cracking units, reforming furnaces), as well as waste incineration, industrial boilers, and solar thermal energy systems.
Q
What is the bulk density of Alumina Bubble Brick and why does it matter?
The bulk density of Alumina Bubble Brick is 1.4–1.7 g/cm³ across all purity grades. This low density significantly reduces the overall structural load on furnace equipment, simplifies installation procedures, and lowers transportation costs — without compromising mechanical strength or thermal performance.
Q
Can Alumina Bubble Brick resist chemical corrosion from molten metals and slag?
Yes. The high alumina purity composition provides excellent chemical inertness and corrosion resistance against molten metals, slag, and aggressive chemical media commonly encountered in metallurgical and petrochemical environments. This resistance directly extends the service life of furnace linings and reduces maintenance frequency and downtime.