Brown Fused Aluminum Oxide

Brown aluminum oxide abrasive is fused and crystallized under high temperature from a mixture of bauxite and other materials. It is characterized by its high bfa2hardness, good toughness and sharp shape in particles. Suitable for grinding metals of high-tensile strength such as carbon stele, general purpose alloy steel, malleable cast-iron and hard bronze etc.

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 the most common abrasives used by industry for refractory materials, sandblasting, free grinding, resin abrasives, coated abrasives, waterjet cutting, water filtration and function filter, etc.
  • Brown fused alumina is used for lapping and polishing process.
  • Brown fused alumina is used for making producing molds in 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%


Size Available:
Abrasives F16-F1200, P12-P1200
Refractory 0-1mm,1-3mm,3-5mm,200mesh,325mesh
Other special specifications could be supplied as required