Alumina Bubble Bricks
Alumina hollow ball brick/Alumina bubble brick is a high-grade lightweight refractory insulation brick made from high-purity alumina hollow balls as aggregate, matched with ultra-fine alumina powder and special binder. After forming, drying and firing at an ultra-high temperature of 1750℃, the brick features a closed porous honeycomb structure. It combines excellent high-temperature resistance and ultra-low thermal conductivity, making it an ideal lining material for ultra-high temperature industrial furnaces.
Customization & Service
1. Customized standard bricks, curved bricks and special-shaped bricks according to drawings
2. Products with different purities: 90%, 95%, 98% available
3. Export standard packaging, suitable for sea and air transportation
4. Provide quality inspection reports, certificates of origin and other foreign trade documents
Key Advantages:
1. Ultra-high Temperature Resistance
Long-term service temperature: 1700–1750℃, max up to 1800℃. Small permanent linear change on reheating and stable dimension at high temperature.
2. Excellent Thermal Insulation & Energy Saving
Ultra-low thermal conductivity with remarkable energy-saving effect. Energy saving rate can reach over 30%, greatly reducing fuel cost.
3. Lightweight & High Strength
Low bulk density reduces furnace load. With good cold crushing strength, it can be directly used as high-temperature working layer.
4. Good Thermal Shock & Corrosion Resistance
Resistant to acid and alkali corrosion, slag erosion, and with excellent thermal shock resistance, suitable for frequent heating and cooling conditions.
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INDEX
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RBTHB-85
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RBTHB-90
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RBTHB-98
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RBTHB-99
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Max Service Temperature(℃)
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1750
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1800
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1800
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1800
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Bulk Density(g/cm3) ≥
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1.4~1.9
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1.4~1.9
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1.4~1.9
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1.5~2.0
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Cold Crushing Strength(MPa) ≥
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10
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10
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11
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12
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Permanent Linear Change@1600℃×3h (%)
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±0.3
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±0.3
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±0.3
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±0.3
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Thermal Conductivity(W/m.k)
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0.30
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0.35
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0.50
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0.50
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Al2O3(%) ≥
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85
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90
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98
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99
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Fe2O3(%) ≤
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0.5
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0.2
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0.1
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0.1
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ZrO2(%) ≥
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―
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―
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―
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―
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Metallurgical industry: Alumina hollow ball bricks can be used for thermal insulation of high-temperature equipment such as blast furnaces, hot blast furnaces, converters, etc.
Chemical industry: used for thermal insulation of furnaces, heat exchangers, steampipes, etc.
Building materials industry: used for thermal insulation of sintering kilns, rotary kilns, pulverized coal hot blast furnaces, etc.
Light industry, ceramics, glass, electronics and other industries: widely used in the lining of various high-temperature kilns, such as cracking furnaces, tunnel kilns, push plate kilns, crucible furnaces and various electric furnaces and electric kilns.
Petrochemical Industry
Carbon Black Industry
Metallurgical Industry
Chemical Industry
Frequently Asked Questions
Need help? Be sure to visit our support forums for answers to your questions!
We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
Yes, of course, you are welcome to visit RBT company and our products.
There is no limit, we can provide the best suggestion and solution according to your situation.
We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
