Alumina Bubble Brick
Ruitai Lianxin alumina bubble bricks combine high refractoriness with low bulk density—typically 40%–50% lighter than standard high-alumina bricks. This weight reduction not only lowers the structural load on the furnace steel structure but also reduces heat storage in the furnace lining, thereby accelerating heating and cooling cycles and shortening production cycles, making it a cost-effective insulation solution for heat treatment equipment in metallurgy, ceramics, glass, petrochemicals, and electronics.
Features of Alumina Bubble Bricks
Alumina bubble bricks are manufactured using precision-grade raw materials and advanced sintering technology, exhibiting balanced performance across all key thermal insulation and refractory properties. Their main characteristics include:
- Excellent thermal insulation with low thermal conductivity, effectively raise furnace thermal efficiency and reduce heat loss.
- Small heat capacity enables fast heating & cooling, greatly shorten kiln production cycles.
- Ultra-light hollow sphere structure lightens overall furnace load and reduces construction cost.
- Outstanding energy-saving refractory material, obviously cut long-term fuel and power consumption.
Wide Range of Applications of Alumina Bubble Bricks
As a professional lightweight refractory and insulation material, alumina bubble bricks can be used as working furnace linings in the medium-temperature zone, as well as as a supporting insulation layer behind refractory materials in the high-temperature zone.
Used as a supporting insulation layer for blast furnaces, heating furnaces, heat-insulating pools, and heat treatment furnaces. Its low thermal conductivity reduces heat loss from the furnace shell, lowers the outer wall temperature, thereby improving worker safety and reducing overall fuel consumption in steel production.
Used in the regenerator, superstructure, and furnace top back lining of glass melting furnaces. Its high alumina content ensures compatibility with alkaline atmospheres, while its insulation properties help maintain a stable furnace top temperature and extend the furnace’s service life.
Widely used in tunnel kilns, shuttle kilns, and roller kilns for firing ceramic products and refractory materials. The lightweight lining has low heat storage, which can accelerate the firing cycle, improve temperature uniformity, and thus directly improve product consistency and increase kiln output.
Used as an insulating lining for cracking furnaces, reformers, and gasifiers to meet the requirements of high thermal efficiency and heat cycle resistance. Its low heat storage characteristics support frequent start-up and shutdown operations without causing excessive thermal stress to the furnace structure.
Technical Parameters of Alumina Bubble Bricks
To meet the high-temperature insulation requirements under different temperature levels and atmospheres, Alumina bubble bricks are available in various grades and specifications. The corresponding physicochemical properties are detailed in the table below:
Alumina Bubble Brick
| Alumina bubble brick | Alumina bubble brick | |||
| 85 | 90 | 99 | 98 | |
| Maximum service temperature℃ | 1680 | 1700 | 1800 | 2200 |
| Al203% | 85 | 90 | 99 | |
| ZrO₂% | 一 | 一 | 98(Stabilizer containing) | |
| SiO₂%≤ | 13 | 8 | 0.2 | 0.2 |
| Fe₂O₃%≤ | 0.2 | 0.2 | 0.2 | 0.2 |
| Bulk density g/cm³≤ | 1.4-1.7 | 1.4-1.7 | 1.4-1.7 | 3.0 |
| C.C.S MPa ≥ | 12 | 10 | 9 | 8 |
| Refractoriness Under Load 0.1MPa 0.6%℃ ≥ | 1650 | 1700 | 1700 | 1700 |
| Permanent Linear Change on heating (1600℃×3h)% | ±0.3 | ±0.3 | ±0.3 | ±0.2 |
| Thermal expansion coefficient (×10-6)(-1300℃)% | ~7.8 | ~8.0 | 8.6 | ~9.1 |
| Thermal Conductivity W/m·k(average800℃)≤ | 0.6 | 0.7 | 1.5 | 0.3 |
Why Choose Ruitai Lianxin Aumina Hollow Spherical Bricks?
Ruitai Lianxin is committed to providing global customers with superior high-temperature kiln refractory material solutions.
Factory Direct Supply
Factory direct price reduces your overall refractory procurement cost, bulk full-container orders get extra volume discount.
Full-Range Quality Control
Each batch passes thermal conductivity, refractoriness and compressive strength test to meet international refractory standards.
Custom Refractory Service
We produce non-standard size, arch brick, groove bricks strictly per customer kiln drawings, matching all kinds of industrial furnace lining demands.
Global Export Logistics
20+ years refractory export experience, proficient in customs clearance, FOB/EXW terms. Standard delivery cycle 15–30 working days.
Price of Alumina Bubble Bricks
The final price quote for alumina bubble bricks from Ruitai Lianxin refractory materials factory depends on several factors: alumina purity grade, order quantity, standard or custom shape, packaging method, and sea freight costs.
Please send your kiln drawings and order quantity to our sales team to obtain a transparent and competitive wholesale price.
Ruitai Lianxin Refractory Brick Manufacturing Process
Our standardized production line ensures that the quality of every batch of alumina bubble bricks remains consistent.
Ruitai Lianxin Refractory Brick Customer Case
As one of China’s leading professional refractory material manufacturers, we focus on exporting high-standard refractory bricks and providing factory-direct refractory bricks to industrial clients worldwide. Our products and customized kiln fire bricks solutions are widely praised globally, and we have stable, long-term partners in many countries, including Uzbekistan, Syria, and Pakistan.
Pakistan | Corundum Refractory Fire Brick | Rotary Kiln Lining
Indian Customers | High Alumina Refractory Fire Brick | Cement Kiln
Uzbekistan | Magnesium Aluminum Chromium Spinel Brick | Rotary Kiln
Syria | Refractory Cement | Blast Furnace Refractory Materials
Russia | Magnesium Chrome Brick | Cement Kiln Fire Bricks
Egypt | Sintered Zirconia Corundum Bricks | Glass Kiln
Cooperation Partners
Contact Us
If you are looking for a trustworthy refractory brick manufacturer or supplier, or need wholesale services for alumina bubble bricks and other refractory bricks, we are the ideal choice. As a factory-direct refractory brick supplier, Ruitai Lianxin not only offers highly competitive prices, but also provides professional customization services and comprehensive after-sales support.
Contact us today for a free quote and customized kiln refractory brick solutions. Let us become your long-term partner in the refractory materials field!