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AC3493 Bubble Alumina Tube

  • Catalog No. AC3493
  • Material Al2O3
  • Purity >99%
  • Bulk Density 0.96 g/cc

Bubble Alumina Tube Description

Bubble Alumina is a rigid, low-density, insulating refractory. Bubble Alumina’s structure consists primarily of closed air-filled thin-walled cells which combine to give it exceptional hot strength and low thermal conductivity. This makes Bubble Alumina an effective high-temperature thermal insulator in structural applications. It is appropriate for use at temperatures as high as 1825℃. It is pre-fired, contains no organics, and exhibits high microwave and RF transparency. Its high alumina content makes it compatible with many extreme chemical environments.

Bubble Alumina Tube Specifications

Color White
Composition (Al2O3), % 99+
Bulk Density, g/cc 0.96
Cold Crush Strength, Mpa (psi) 11 (1600)
Shrinkage, % Average of Length & width
4 hr. at 1750℃ 0.19
4 hr. at 1800℃ 1.77
Specific Heat, Btu/lb ℉(J/kg·K) 0.27


Bubble Alumina Tube Applications

* Structural hot face refractory in high-temperature furnaces and thermal process systems with temperatures of 1825℃.

* Backup insulation in crystal growth furnaces with temperatures in excess of 2000℃.

* Low-mass kiln furniture.

* High-temperature load-bearing insulation.


Our Bubble Alumina Tube is carefully handled during storage and transportation to preserve the quality of our product in its original condition.

Related Documents
Alumina Ceramic Materials Brochure
Technical brochure for Alumina Ceramic Materials, all grades. Revision March 2023.
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