Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Alumina Bubble Brick
Alumina Bubble Brick | High-Temperature Lightweight Refractory Brick
Alumina Bubble Brick is a lightweight refractory insulation material primarily made from high-purity alumina (Al₂O₃). Featuring a unique hollow ball structure and excellent overall performance, it is a high-performance insulating brick ideal for ultra-high-temperature applications (>1500°C) that require lightweight properties and superior thermal shock resistance.
Characters of Alumina Bubble Brick:
✅ 🪶Lightweight & Low Density: Reduces kiln structure load and lowers installation costs.
✅ ❄️High-Efficiency Insulation: Improves energy savings by 30%-50%, minimizing heat loss.
✅ 🔥Ultra-High Temperature Resistance: Ideal for steel, petrochemical, and other extreme high-temperature industries.
✅ ⚡Superior Thermal Shock Resistance: Extends lifespan in kilns with frequent start-stop cycles.
✅ 🧪Excellent Chemical Stability: Resistant to acid, alkali, and reducing atmospheres, making it suitable for metallurgical, chemical, and other complex environments.
Typical Applications of Fireclay Insulating Brick:
✅🏭 High-Temperature Industries: Used for petrochemical cracking furnace linings and insulation layers in ladles/intermediate ladles.
✅🛰️ Specialized Equipment: Applied in thermal insulation for spacecraft high-temperature components and laboratory electric furnace chambers.
✅🍕 Residential Use: Ideal for high-end pizza ovens and regenerative chambers in glass kilns.
Parameters of Alumina Bubble Brick:
Item
LG-85
LG-90
LG-95
LG-99
Al₂O₃ (%)≥
85
90
95
99
SiO₂(%)≤
15
8
0.3
0.2
Fe₂O₃(%)≤
0.2
0.2
0.2
0.15
Bulk Density (g/cm³)
1.4-1.7
1.4-1.7
1.4-1.7
1.4-1.7
Max Service Temperature (℃)
1680
1700
1750
1800
Cold Crushing Strength（MPa)≥
12
10
9
9
Refractoriness Under Load (0.1MPa, 0.6%)℃≥
1650
1700
1700
1700
Reheating Linear Change Rate (1600℃*3h)%
±0.3
±0.3
±0.25
±0.2
Thermal Conductivity (at 800℃ )≤
0.8
1.3
1.5
1.5
FAQ:
Q:What is an alumina bubble brick?
A:Alumina bubble brick is a high-temperature insulating refractory product made from fused alumina hollow spheres. It offers excellent thermal insulation, low thermal conductivity, and can withstand temperatures up to 1800°C.
Q:What’s the maximum operating temperature?
A:Our alumina bubble bricks can withstand continuous temperatures of up to 1800°C (3272°F), depending on the design and service environment.
Q:Are your bricks customizable in shape and size?
A:Yes. We support custom manufacturing based on your technical drawings or application requirements. We also offer various standard sizes for quick delivery.
Q:Do you offer OEM or private labeling services?
A:Absolutely. As a factory, we support OEM, ODM, and private labeling to suit your branding and distribution needs.
Q:Can I get samples before placing a bulk order?
A:Yes, we offer free samples for quality evaluation. You only need to cover the shipping fee.
Q: What is your minimum order quantity (MOQ)?
A:For standard sizes, MOQ is typically 1 pallet (approximately 500–800 bricks). For custom designs, we will confirm MOQ based on your specifications.
Q:How is the product packaged and shipped?
A:Products are packed in fumigation-free wooden crates with protective film. We support FOB, CIF, DDP and deliver globally by sea, air, or rail.
Q:What certifications do you provide?
A:We provide ISO 9001, SGS test reports, and material data sheets to ensure quality and compliance.
