Alumina Bubble Insulation Brick is a high-performance refractory material made from high-purity alumina and hollow alumina bubbles. This unique composition results in a lightweight brick with excellent thermal insulation properties, superior thermal shock resistance, and outstanding mechanical strength. With a maximum service temperature up to 1800℃, these bricks are widely used in various high-temperature industrial furnaces and kilns to reduce heat loss, improve energy efficiency, and extend furnace service life.
Technical Specifications
| Item / Grade | 85 | 90 | 99 |
|---|---|---|---|
| Max Service Temperature (℃) | 1680 | 1700 | 1800 |
| Al₂O₃ Content (%) | ≥85 | ≥90 | ≥99 |
| SiO₂ Content (%) | ≤13 | ≤8 | ≤0.2 |
| Fe₂O₃ Content (%) | ≤0.2 | ≤0.2 | ≤0.2 |
| Bulk Density (g/cm³) | 1.4–1.7 | 1.4–1.7 | 1.4–1.7 |
| Cold Crushing Strength (MPa) | ≥12 | ≥10 | ≥9 |
| Reheating Linear Change (1600℃ × 3h) | ±0.3% | ±0.3% | ±0.3% |
| Thermal Expansion Coefficient | ~7.8×10⁻⁶/℃ | ~8.0×10⁻⁶/℃ | ~8.6×10⁻⁶/℃ |
| Thermal Conductivity (at 1800℃) | ≤0.8 W/m·K | ≤1.3 W/m·K | ≤1.5 W/m·K |
Key Features
Lightweight & High Strength: Combines low bulk density with good mechanical strength to withstand handling and installation stresses.
Superior Thermal Insulation: Low thermal conductivity reduces heat loss and enhances furnace energy efficiency.
Excellent Thermal Shock Resistance: Maintains structural integrity under rapid temperature changes.
High Purity Alumina: Ensures chemical stability and resistance to corrosion in various furnace atmospheres.
Customizable Sizes: Supports tailored shapes and dimensions to fit specific furnace designs.
Typical Applications
Industrial kilns and furnaces in metallurgy, ceramics, glass, and chemical industries.
Heat insulation layers in high-temperature zones such as hot faces and backup linings.
Thermal insulation for crystal growth and vacuum furnaces.
Petrochemical reactor insulation where corrosion resistance is critical.
Energy-saving retrofit and maintenance of existing refractory linings.
Production Details
Our Alumina Bubble Insulation Bricks are produced using advanced high-temperature sintering technology and strict quality control procedures. The incorporation of high-purity alumina bubbles creates a porous, lightweight structure that delivers excellent insulation and mechanical performance. Each batch undergoes rigorous testing for chemical composition, density, strength, and thermal properties to ensure consistent product quality.
Packing and Shipping Details
Packaging: Standard wooden crates or pallets, securely wrapped to prevent damage during transportation.
Quantity per Crate: Depends on brick size; typically 50-100 pcs per crate.
Shipping Method: Sea freight, air freight, or express courier based on customer requirements.
Delivery Time: 15-30 working days after order confirmation.
Custom Packaging: Available upon request for special project needs.
Frequently Asked Questions (FAQ)
Q1: What is the maximum service temperature of alumina bubble insulation bricks?
The bricks can operate reliably up to 1800℃ depending on the grade.
Q2: Can custom sizes or shapes be made?
Yes, we offer customization based on customer drawings or specific furnace requirements.
Q3. How does alumina bubble brick compare to traditional insulation bricks?
It is lighter, has better thermal shock resistance, and provides superior insulation due to the hollow alumina bubbles.
Q4: What is the typical delivery time after placing an order?
Usually between 15 to 30 working days, depending on order quantity and customization.
Q5: Are these bricks resistant to chemical corrosion?
Yes, with high alumina content and proper sintering, the bricks resist various corrosive atmospheres.
