High Purity Alumina Bubble Insulation Brick is specially formulated for demanding industrial furnace environments. Made from ultra-high purity alumina combined with hollow alumina bubbles, these bricks provide superior thermal insulation with low thermal conductivity and excellent mechanical strength. They are ideal for reducing heat loss, improving energy efficiency, and extending furnace life in a variety of high-temperature industrial applications up to 1800℃.
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
Ultra-high purity alumina ensures excellent chemical stability and corrosion resistance.
Lightweight, porous structure created by alumina bubbles delivers outstanding insulation performance.
High mechanical strength suitable for harsh industrial furnace conditions.
Excellent thermal shock resistance extends service life under cyclic temperature changes.
Customizable dimensions to meet specific furnace design requirements.
Typical Applications
Insulation lining for metallurgical, ceramic, and glass industrial furnaces.
Thermal protection for vacuum and crystal growth furnaces.
Energy-saving insulation for high-temperature reactors and kilns.
Petrochemical and chemical processing furnace insulation.
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.
