Zhengzhou Zhongkeda Refractory Materials Co., Ltd
High Alumina Insulation Brick
Lightweight High Alumina Insulating Brick
High Strength • Excellent Thermal Insulation • Custom Sizes Available
High-alumina insulating brick is a lightweight thermal insulation refractory material primarily composed of high-purity alumina (Al₂O₃), designed for thermal insulation in high-temperature industrial equipment. It features high porosity, low bulk density, excellent insulation performance, high mechanical strength, low thermal conductivity, and long service life. As an essential refractory material for energy-saving and insulation in various industrial kilns and furnaces, it plays a crucial role in thermal efficiency and durability.
Key Features
• Low Bulk Density：0.6-1.2 g/cm³ lightweight structure reduces furnace load.
• Excellent Thermal Insulation：Low thermal conductivity helps reduce heat loss and energy consumption.
• High Temperature Performance：Suitable for high temperature industrial kiln insulation.
• Good Thermal Shock Resistance：Stable performance under repeated heating and cooling cycles.
• Easy Installation：Lightweight bricks reduce construction difficulty.
• Customized Sizes Available：Standard and special shapes can be supplied.
Technical Specifications of Lightweight High-alumina Brick:
| Item |
LG-1.2 |
LG-1.0 |
LG-0.8 |
LG-0.7 |
LG-0.6 |
LG-0.5 |
|
Al₂O₃/(%)≥ |
48 |
48 |
48 |
48 |
48 |
48 |
|
Fe₂O₃/（%）≤ |
2.0 |
2.0 |
2.0 |
2.0 |
2.0 |
2.0 |
|
Bulk Density (g/cm³)≤ |
1.2 | 1.0 | 0.8 | 0.7 | 0.6 | 0.5 |
|
Cold Crushing Strength (MPa)≥ |
4.5 | 3.5 | 2.5 | 2.2 | 1.6 | 1.2 |
|
Permanent Linear Change on Heating/（%）（T/℃*12h) |
1400 | 1400 | 1400 | 1350 | 1350 | 1250 |
|
Thermal conductivity W/(m•K)Mean temperature (350±25)℃ ≤ |
0.55 | 0.50 | 0.35 | 0.30 | 0.25 | 0.20 |
Typical Application
✔Ceramic Industry：Tunnel kiln, shuttle kiln insulation layer
✔Steel Industry：Heating furnace, heat treatment furnace
✔Cement Industry：Rotary kiln insulation zones
✔Non-ferrous Industry：Industrial furnace lining
Why Choose Us
FAQ:
A1: Our bricks are rated for continuous use up to 1350°C (2462°F), depending on the alumina content. They're ideal for insulating layers in high-temperature industrial furnaces.
Q2: Are these bricks suitable for direct contact with flame?
A2: Lightweight high alumina bricks are primarily used for insulation purposes and should not be exposed to direct flame or heavy mechanical load. For hot face applications, consider dense firebricks or mullite bricks.
Q3: Can you customize the brick size and shape?
A3: Yes, we offer OEM customization based on your drawings or standard dimensions. We can produce arch bricks, special curves, or complex shapes as needed.
Q4: Are the bricks environmentally safe?
A4: Absolutely. Our products are asbestos-free, meet RoHS and REACH standards, and are manufactured in accordance with ISO 9001 quality systems.
Q5: Do you provide free samples for testing?
A5: Yes, free samples are available for qualified B2B buyers. Please contact us with your requirements and shipping details.
Q6: What is the typical lead time for bulk orders?
A6: For standard sizes, our lead time is around 7–15 working days. For custom orders, it may vary depending on the complexity and quantity.
Q7: Do you support international shipping?
A7: Yes, we ship worldwide via sea or air freight. We can also assist with CIF/DDU/DAP terms and work with your freight forwarder if needed.
