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
|Composition (Al2O3), %
|Bulk Density, g/cc
|Cold Crush Strength, Mpa (psi)
|Shrinkage, % Average of Length & width
|4 hr. at 1750℃
|4 hr. at 1800℃
|Specific Heat, Btu/lb ℉(J/kg·K)
Bubble Alumina Tube Applications
* Structural hot face refractory in high-temperature furnaces and thermal process systems with temperatures to 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.