Description
Alumina bubble brick is made primarily from alumina hollow balls and alumina powder, combined with other binders and fired at a high temperature. It is a type of ultra-high temperature energy-saving thermal insulation material. The characteristics of these bricks include excellent thermal insulation properties (low thermal conductivity and high thermal resistance), high fire resistance, chemical stability, good thermal stability, and a certain degree of mechanical strength.
Advantages of Alumina Bubble Brick
• Ultra-light
Lightweight alumina bubble structure helps reduce furnace lining weight and heat storage.
• High-strength
Provides reliable mechanical strength for demanding high-temperature insulation layers.
• High-refractoriness
Designed for stable performance in industrial furnaces operating at ≥1800℃.
• Hollow Ball Structure
Unique alumina hollow spheres improve insulation while maintaining structural stability.
Specification of Alumina Bubble Brick
| Item | LQZ-99 -1.4 | LQZ-99 -1.6 | LQZ-99 -1.8 | LQZ-95 -1.4 | LQZ-95 -1.6 | LQZ-95 -1.8 | LQZ-90 -1.4 | LQZ-90 -1.6 | LQZ-90 -1.8 |
| ω(Al₂O₃) / % ≥ | 99 | 95 | 90 | ||||||
| ω(SiO₂) / % ≤ | 0.3 | – | – | ||||||
| ω(Fe₂O₃) / % ≤ | 0.2 | 0.2 | 0.2 | ||||||
| Bulk density / (g/cm³) | 1.3~1.5 | 1.5~1.7 | 1.7~1.9 | 1.3~1.5 | 1.5~1.7 | 1.7~1.9 | 1.3~1.5 | 1.5~1.7 | 1.7~1.9 |
| CCS / MPa ≥ | 6 | 10 | 12 | 8 | 12 | 16 | 10 | 14 | 18 |
| λ [W/m·k] (350±25℃) ≤ | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 |
| HPLC (1600℃×3h) / % | -0.3~+0.3 | -0.3~+0.3 | -0.3~+0.3 | ||||||
Product Size: We offer refractory brick sizes that comply with ISO, EN, ASTM, JIS, etc, and customized sizes.
Applications of Alumina Bubble Bricks
Alumina bubble bricks are suitable for high-temperature industrial furnaces requiring lightweight insulation, low heat storage and stable service performance. They are commonly used as insulation linings, backup layers and selected working layers in furnaces operating under severe thermal conditions.
- Iron and Steel Industry: Insulation and working layers in blast furnace hot blast stoves, heating furnaces, and soaking pits.
- Glass Industry: Insulation layers for tank walls, breast walls, and other critical sections of glass melting furnaces.
- Industrial Kilns: Linings and insulation layers for tunnel kilns, shuttle kilns, roller kilns, and other high-temperature ceramic or glass furnaces.
- Power Plants: Thermal insulation in furnace chambers, flues, air preheaters, and other components of boilers in thermal power plants.
- Non-Ferrous Metallurgy: Reliable insulation layers in furnaces for non-ferrous metal smelting.
Certificates and Patents
JHYRef is certified under ISO 9001, ISO 14001 and ISO 45001 management systems, reflecting standardized quality control, environmental management and occupational health and safety practices throughout production.
Our patented refractory-related technologies and standardized production control help support stable product quality, responsible manufacturing and reliable long-term supply.
Quality Assurance
Each batch of alumina bubble bricks is tested under strict quality control procedures to ensure stable performance and compliance with project requirements. Key performance indicators include bulk density, cold crushing strength, thermal conductivity, permanent linear change and high-temperature volume stability.
Testing procedures can be carried out according to international standards such as ISO, ASTM and EN. Batch-specific test reports are available upon request to support transparent quality verification and customer confidence.
Technical Support and Services
JHYRef provides technical support for alumina bubble brick projects, including product specification confirmation, customized size recommendations, installation drawing review and refractory lining guidance.
For furnace projects, our team can also support special-shaped brick customization, refractory castable matching, installation supervision and other project-based refractory solutions.
