Lightweight corundum bricks are lightweight shaped refractories made primarily from high-purity alumina (Al₂O₃). By introducing a controlled pore structure and firing at high temperatures, the material retains the high-temperature and corrosion resistance of corundum while significantly reducing bulk density. They are mainly used in insulation layers or high-temperature furnace linings in industrial furnaces and kilns.
In modern industrial furnaces, relying solely on dense refractory materials is no longer sufficient to meet modern energy-efficiency and structural requirements. With an optimized pore structure, lightweight corundum bricks significantly reduce thermal conductivity while maintaining high-temperature resistance, thereby reducing furnace lining thickness and overall energy consumption.
This product is typically used in combination with dense corundum bricks, high-alumina bricks, or refractory castables to form a composite furnace lining consisting of a working layer and an insulation layer. This structure maximizes energy efficiency while ensuring safe operation.
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Brand project |
Alumina hollow sphere products |
Corundum Mullite, Mullite |
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HX-GK-99 |
HX-GK-90 |
HX-GK-85 |
HX-GK-80 |
HX-GM -1.5-2.0 |
HX-GM -1.3 |
HX-M -1.0 |
HX-M -0.9 |
HX-M -0.8 |
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Al2O3 % |
≥98 |
≥90 |
≥85 |
≥80 |
≥80 |
≥63 |
≥60 |
≥60 |
≥55 |
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Bulk density g/cm3 |
1.4～2.0 |
1.4～2.0 |
1.4～2.0 |
1.4～2.0 |
1.5～2.0 |
1.2～1.5 |
1.0L |
0.9L |
0.8L |
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room temperature compressive strength MPa |
≥8 |
≥10 |
≥10 |
≥10 |
≥12 |
≥7 |
≥4 |
≥4 |
≥3 |
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0.1MPa Load softening Starting temperature T2℃ |
≥1700 |
≥1700 |
≥1680 |
≥1650 |
≥1700 |
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Reheating linear change rate % |
1500℃ ×8h -1.0 |
1450℃ ×8h -1.0 |
1450℃ ×8h -1.0 |
1350℃ ×8h -1.0 |
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Maximum operating temperature ℃ |
1780 |
1750 |
1720 |
1700 |
1680 |
1550 |
1500 |
1450 |
1400 |
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Purpose |
High-temperature insulating heat pipes and working linings suitable for high-temperature kilns and thermal equipment |
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●Low density: Reduces the overall weight of the kiln and reduces structural load;
●High strength: Provides excellent mechanical strength and impact resistance;
●Low thermal conductivity: Effectively reduces heat transfer and improves heat retention;
●Good chemical stability: Resistant to acid and alkali corrosion, extending service life.
● Made from high-purity corundum with a lightweight structure
● Combines high-temperature resistance with excellent thermal insulation
● Reduces energy consumption and extends the service life of the furnace lining system
● Widely used in insulation layers for high-temperature industrial furnaces
● Insulation linings for high-temperature industrial furnaces
● Metallurgical heating and heat-treatment furnaces
● Petrochemical cracking furnaces and reactors
● Laboratory furnaces and high-temperature testing equipment
● Furnace components requiring high energy efficiency and weight reduction
The products are packed in sturdy wooden crates with foam or EPE foam padding to prevent damage during transportation. Various shipping methods are available, including sea freight and air freight, and door-to-door service can also be provided upon request. The packaging is clearly labeled with product information, moisture-proof labels, and fragile-item markings.
Q1: What is the difference between lightweight corundum bricks and lightweight high-alumina bricks?
A: Lightweight corundum bricks have higher purity, higher refractoriness, and a higher service temperature, making them more suitable for demanding high-temperature applications.
Q2: Can lightweight corundum bricks be used as a working layer?
A: They are typically used as an insulation layer and are not recommended for direct use as a working layer exposed to erosion.
Q3: Can the density and size be customized?
A: Yes. The density and dimensions can be customized according to furnace type and energy-efficiency requirements.
Q4: Will the bricks pulverize or shrink at high temperatures?
A: The product has excellent volume stability and will not show noticeable pulverization or abnormal shrinkage under normal operating conditions.
Q5: Is it suitable for furnaces and kilns that operate continuously for long periods?
A: Yes. It is especially suitable for continuously operating furnaces with strict energy-efficiency and load requirements.
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