Maximum Service Temperature: Up to 1800 degrees Celsius (3270 degrees Fahrenheit).
High Alumina Purity: Typically 98 percent to 99 percent Al2O3, ensuring zero contamination for glass and sapphire growth industries.
Ultra-Low Bulk Density: Ranging from 1.1 to 1.5 g/cm3. This reduces the total weight of the furnace structure, allowing for lighter steel frameworks and lower construction costs.
Superior Thermal Conductivity: Our "bubble" technology provides insulation that is 3 times more effective than standard heavy firebricks, drastically cutting your monthly gas or electricity bills.
(1) Ultra-lightweight structure with high alumina purity
(2) Excellent high-temperature insulation performance
(3) High service temperature capability
(4) Low heat storage and fast thermal response
(5) Good dimensional stability at high temperatures
(6) Adequate mechanical strength for insulation linings
(1) High-temperature industrial furnaces:Electric furnace, heat treatment furnace, laboratory furnace, shuttle kiln, batch kiln, annealing furnace, sintering furnace.
(2) Ceramic and advanced materials industry:High-temperature ceramic kilns, technical ceramic firing furnaces, catalyst calcination furnaces, powder sintering furnaces.
(3) Nonferrous metal and special metallurgy:Aluminum holding furnace insulation layer, copper and nickel heat treatment furnaces, nonferrous alloy melting furnace insulation zones.
(4) Energy-saving and special thermal equipment: High-temperature insulation lining of reformer furnaces, cracking furnaces, waste incinerators, high-temperature reactors and thermal processing units
Below are representative technical specifications. Custom grades are available upon request.
| Property | Typical Value | Practical Meaning |
| Al₂O₃ Content | 90–99% | Higher purity ensures higher service temperature |
| Bulk Density | 1.3–1.9 g/cm³ | Lightweight structure reduces furnace load |
| Apparent Porosity | ≥70% | Improves insulation efficiency |
| Cold Crushing Strength | 6–18 MPa | Sufficient strength for furnace construction |
| Thermal Conductivity (1000°C) | 0.9–1.2 W/m·K | Lower heat loss, better energy saving |
| Refractoriness | ≥1800°C | Suitable for ultra-high temperature zones |
| Permanent Linear Change | ≤0.5% | Stable dimensions during long-term use |
Note: Exact parameters can be adjusted according to application requirements.
Foam Insulation Brick: The Ultimate Lightweight Solution for Extreme Heat
In the pursuit of furnace efficiency, traditional dense firebricks often fall short. They absorb too much heat and waste too much energy. This is where the foam insulation brick—professionally known as the Alumina Bubble Brick—becomes the secret weapon for modern high-temperature industries.
At Highland Refractory, our foam insulation bricks are engineered by trapping microscopic air bubbles within high-purity alumina crystals. This "foam-like" structure creates an elite thermal barrier that can withstand direct flame contact at temperatures where other insulating bricks would melt.
Technical Performance: Why 1800C Rated "Foam" Matters
When you search for "foam insulation brick," you are looking for more than just a lightweight material; you are looking for thermal stability. Highland's bubble bricks offer performance metrics that lead the industry:
Maximum Service Temperature: Up to 1800 degrees Celsius (3270 degrees Fahrenheit).
High Alumina Purity: Typically 98 percent to 99 percent Al2O3, ensuring zero contamination for glass and sapphire growth industries.
Ultra-Low Bulk Density: Ranging from 1.1 to 1.5 g/cm3. This reduces the total weight of the furnace structure, allowing for lighter steel frameworks and lower construction costs.
Superior Thermal Conductivity: Our "bubble" technology provides insulation that is 3 times more effective than standard heavy firebricks, drastically cutting your monthly gas or electricity bills.
Where Highland Foam Insulation Bricks Shine
These are not standard fireplace bricks. Our foam insulation bricks are designed for the most critical heat zones in high-value manufacturing:
Ceramic and Kiln Industry: Used as the hot-face lining in shuttle kilns and tunnel kilns where rapid heating and cooling cycles are required.
Semiconductor and Sapphire Growth: Because of the high Alumina purity, our bricks provide a clean environment for crystal growth without outgassing or mineral contamination.
Petrochemical Reactors: Ideal for lining gasifiers and sulfur recovery units where both heat resistance and chemical inertness are non-negotiable.
Glass Industry: Used in the upper structures of glass melting furnaces to prevent heat loss through the crown.
The Highland Advantage: Precision and Protection
As a professional B2B exporter, Highland Refractory focuses on the two things that matter most to international buyers: Precision and Safe Delivery.
CNC Precise Dimensions A "foam" brick is only as good as its fit. If the gaps between bricks are too wide, heat escapes. We use precision grinding machines to ensure that every brick has a perfect 90-degree edge. This allows for thin-joint masonry, which extends the life of the entire furnace lining.
Professional Export Packaging Because foam insulation bricks are lightweight and have a porous structure, they can be more fragile than dense bricks. We have perfected a 4-layer protection system for all global shipments:
Individual foam separators between high-value bricks.
Reinforced, heat-treated wooden crates.
Vacuum-sealed moisture barriers to prevent hydration during ocean transit.
Steel-banded corner protectors for every pallet.
Installation and Maintenance Tips
To get the most out of your insulation bricks, Highland engineers recommend:
Use High-Purity Alumina Mortar: Always match the chemistry of your mortar to the brick. Using a low-grade mortar with a high-purity bubble brick will create a weak point in your lining.
Avoid Mechanical Impact: Foam bricks are designed for thermal resistance, not physical abrasion. Do not use them in zones where heavy materials will hit or scrape the walls.
Controlled Drying: Even though these bricks are "pre-fired," the mortar used to set them contains moisture. Follow a slow ramp-up schedule during the first firing to avoid steam-pressure cracks.
Frequently Asked Questions (FAQ)
Q: What is the difference between a foam insulation brick and a standard firebrick?
A: A standard firebrick is dense and designed to store heat and resist abrasion. A foam insulation brick (Alumina Bubble Brick) is lightweight and designed to stop heat from passing through. You use the foam brick to save energy and reduce the weight of your furnace.
Q: Can I use foam insulation bricks for a pizza oven?
A: While they provide amazing insulation, they are generally "over-engineered" for home pizza ovens. These are industrial-grade tools designed for temperatures above 1500C. For most pizza ovens, our JM23 or JM26 series is a more cost-effective choice.
Q: How do I know if I need 95 percent or 99 percent Alumina?
A: It depends on your atmosphere. If you are working with sensitive electronics, sapphire, or specialty glass, 99 percent is required to prevent contamination. For general furnace insulation, 95 percent is usually sufficient.
Partner with Highland Refractory for Your Thermal Projects
Don't let rising energy costs eat into your profit margins. Highland Refractory’s foam insulation solutions provide the thermal barrier you need to stay competitive in a global market. Whether you need a thousand bricks for a new kiln or custom-machined shapes for a specialized reactor, our team is ready to deliver.
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
