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Alumina Bubble Brick

Strong thermal insulation properties.

Low thermal conductivity.

good thermal stability.

Small change rate of reburning line.

Customized processing of special-shaped alumina bubble bricks.

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Alumina bubble bricks are made of alumina hollow balls and alumina powder as the main raw materials, combined with other binders, and fired at a high temperature of 1750 degrees.


  1. For reducing the weight of the furnace body, transforming the structure, saving materials and saving energy, it will achieve obvious results.
  2. Up to 1750 degrees or more, good thermal stability. The change rate of the reburning line is small, and it can be used for a longer period of time.
  3. Alumina bubble balls have obvious thermal insulation characteristics and low thermal conductivity, which can play a good thermal insulation effect, reduce heat dissipation, improve thermal efficiency, and thus achieve the purpose of saving energy. The energy saving effect can reach more than 30%.


ItemLevel ILevel IILevel III
Al2O3 (%)≥98≥98≥98
SiO2 (%)≤1≤1≤1
Fe2O3 (%)≤0.7≤0.7≤0.7
Refractoriness under load ℃≥1790≥1790≥1790
Refractorines under load, 0.1MPa ℃≥1600≥1600≥1600
Bulk density, g/cm3≤1.2≤1.4≤1.6
True porosity (%)626058
Cold crushing strength, MPa31012
Thermal Conductvity, 1100℃, W.(m.k)0.931.041.16


Alumina Bubble Brick is widely used in high-temperature and high-temperature furnaces such as petrochemical industry gasifiers, carbon black industrial reaction furnaces, and metallurgical industry induction furnaces.

Alumina bubble bricks can be used in high-temperature energy-saving (>30%) downdraft kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, nitriding furnaces, etc. For reducing the weight of the furnace body, reforming the structure, saving materials and saving energy, obvious effects will be achieved.


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