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Black aluminum oxide for glass polishing

Product: Black aluminum oxide

Raw material: Bauxite

Color: Black

Usage: glass polishing

Common size: 46 60 80 120 mesh etc.

Packing: 25kg/bag


Black aluminum oxide use bauxite as its raw material, produced through the procedure of material sorting-electrolytic smelting-crushing-iron removal-magnetic separation-screening-physical and chemical inspection. It has 70-85% Al2O3 content, with suitable hardness and toughness, it can be used as a good media for glass polishing.

Advantages of Black Aluminum Oxide

  • Moderate hardness
  • High toughness
  • Temperature resistance
  • Stable thermal performance
  • Low coefficient of linear expansion

Application of Black Aluminum Oxide

  • Glass polishing

Specification of Black Aluminum Oxide

Item Indicators
Color Black
Crystal Trigonal system
Hardness (Mohs) ≥ 9.0
Melting point (°C) 2050
The maximum temperature (°C) 1850
True Density (g/cm3) ≥ 3. 50
Al2O3% 70-85
Fe2O3% 10
SiO2 8


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