High Alumina Poly Light Insulation Brick, also known as high alumina poly-sphere brick, is a lightweight insulating refractory product made from selected high-grade alumina bauxite and hollow alumina poly-spheres. It is sintered at high temperature to achieve a robust yet lightweight structure with Al₂O₃ content ≥ 60% and excellent thermal resistance up to 1600°C.
Thanks to its low bulk density (0.6–1.35 g/cm³), high porosity (66%–73%), and strong compressive strength, this brick provides excellent thermal insulation and energy-saving performance while maintaining structural integrity under high-temperature environments. It is suitable for direct flame contact and can withstand a working temperature range of 1200–1400°C.
Technical Specifications
| Property | Unit | Typical Value / Range | Remarks |
|---|---|---|---|
| Brand | — | Xintai | — |
| Material | — | High Alumina + Poly-spheres | Lightweight refractory brick |
| Al₂O₃ Content | % | ≥ 60% | Provides high refractoriness |
| Bulk Density | g/cm³ | 0.6 – 1.35 | Based on grade and customer requirement |
| Apparent Porosity | % | 66 – 73 | High porosity for insulation performance |
| Cold Crushing Strength | MPa | 2.5 – 5.5 | Higher density grades yield higher strength |
| Thermal Conductivity | W/m·K | 0.25 – 0.45 | At 350 ±25°C average temperature |
| Maximum Service Temperature | °C | 1600 | Sintered, not ceramic bonded |
| Recommended Working Temperature | °C | 1200 – 1400 | For stable long-term use |
| Thermal Shock Resistance | Times (1100°C→Water) | ≥ 20 | Excellent shock resistance |
| Corrosion Resistance | — | Good | Suitable for reducing/oxidizing atmospheres |
| Standard Size | mm | 230 × 114 × 65 | Custom shapes available |
| Color | — | Light yellow to beige | May vary slightly by batch |
| Packing | — | Wooden pallets with shrink wrap | Export-grade packaging |
| Delivery Time | Days | 7 – 15 working days | Depends on quantity |
Key Features
High Alumina Composition – Ensures high refractoriness and structural reliability
Lightweight with High Strength – Reduces furnace load while maintaining mechanical stability
Excellent Thermal Insulation – High porosity and low thermal conductivity help retain heat and save energy
Outstanding Thermal Shock Resistance – Suitable for repeated heating and cooling cycles
Corrosion Resistance – Performs well in chemically aggressive environments
Direct Flame Contact – Suitable for hot-face applications in industrial kilns and furnaces
Typical Applications
High Alumina Poly Light Insulation Bricks are widely used in:
Ceramic kilns: Tunnel kilns, roller kilns, shuttle kilns
Steel industry: Reheating furnaces, coking furnaces, soaking pits
Heat treatment equipment: Inner linings and insulation layers
General thermal equipment: Backing insulation or working linings for various high-temperature industrial furnaces
Production Details
Packaging: Seaworthy wooden pallets with protective wrapping
Delivery Time: 7–15 working days based on order volume
Customization: Available in sizes, shapes, and density grades
Packing and Shipping Details
Packaging: Packed in strong wooden pallets with protective wrapping
Shipping Time: 7–15 working days after order confirmation
Storage: Keep in dry, ventilated area to avoid moisture absorption
Customization: Shapes and sizes can be tailored to customer specifications
Frequently Asked Questions (FAQ)
Q1: What is a High Alumina Poly Light Insulation Brick?
It is a lightweight insulating brick made from high-grade alumina bauxite and hollow alumina poly-spheres. It offers high thermal resistance, low density, and excellent insulating performance in high-temperature environments.
Q2: What is the maximum service temperature of this brick?
The maximum service temperature is 1600°C, while the recommended continuous working temperature is between 1200°C and 1400°C for optimal performance and durability.
Q3. Can this brick be used in direct contact with flame?
Yes, High Alumina Poly Light Insulation Bricks are suitable for direct flame contact, making them ideal for high-temperature industrial furnaces and kilns.
Q4: What are the available sizes?
The standard size is 230 × 114 × 65 mm. However, custom shapes and sizes are available upon request to meet specific project requirements.
Q5: Can you provide technical support or installation guidance?
Yes, we offer technical consultation and can provide installation guidance or refractory layout drawings based on your application.
