Bubble Alumina

Bubble Alumina is produced by fusing special high purity alumina. The melt is atomized with compressed air which leads to the hollow spheres.

Bubble Alumina is hard but extremely friable with respect to its pressure strength.

The melting point is approximately 2100ºC. Due to its hollow spheres it has a low bulk density and extremely low thermal conductivity. Bubble Alumina is chemically inert.

Chemical and Physical Analysis in wt.% (1-3mm)
Index Al2O3 SiO2 Fe2O3 Na2O B.D g/cm3
Typical value 99.51 0.14 0.05 0.28 0.74
Grits Available:

0-0.2mm. 0.2-1mm,1-3mm, 3-5mm
Other sizes are also available on request.


Due to the above noted properties bubble Alumina is used to form pores in high porosity abrasives and as a media to filtrate aggressive liquids or melts. It can also be used as a bed in the firing process of vitrified grinding wheels.