Brown Fused Alumina


Brown fused alumina, also known as carborundum, is made from bauxite and petroleum coke as raw material, melting in an electric arc furnace at a high temperature of 2200℃. It is a brown hexagonal crystal with a hardness of mosh 9.


  • Brown fused alumina is called as the teeth of industry, it is widely used in refractory material, sandblasting, free grinding, resin abrasives, coated abrasives, waterjet cutting, water filtration and function filter, etc.
  • Brown fused alumina for lapping and polishing process.
  • Brown fused alumina for producing mold of precision casting.

Physical Index of Brown Fused Alumina

Color Brown
Basic Mineral α-AI2O3
True Density 3.90g/cm3
Bulk Density 1.68-1.95g/cm3
Mosh hardness 9.0
Microhardness HV1800-2200

Chemical Composition of Brown Corundum Typical Value:

AI2O3 95.88%
TiO2 2.50%
SiO2 0.80%
Fe2O3 0.09%

Abrasives Grade

Grit size AI2O3 TiO2 SiO3 Fe2O3
F12-F80 >96.0% 1.50-3.50% 1.3% 0.3%
F90-F150 >95.2%
F180-F220 >95.0%
F220 Finer >93.0%

Refractory Grade

Grade size AI2O3 TiO2 SiO2 Fe2O3
0-1mm >95.2% >3.5% >1.0% >0.2%
200mesh >95.0% >3.5% >2.0% >0.4%