Brown Aluminum Oxide is manufactured in an electric furnace that produces an extremely tough, long-lasting blasting grain which is graded to exacting standards. It may be repeatedly recirculated and is chemically stable and not affected by alkalies, acids or harmful atmospheres.
| Application | Size | Chemical composition(%) | ||||
| Al2O3 | Fe2O3 | SiO2 | TiO2 | |||
| Abrasives | 12#-54# | ≥95 | ≤0.5 | ≤1.5 | ≤3.0 | |
| 54#-120# | ≥94 | |||||
| 150#-240# | ≥93 | |||||
| 240#-400# | ≥94 | ≤2.0 | ≤1.5 | ≤3.0 | ||
| 600#-1000# | ≥93.5 | |||||
| 1000#-1500# | ≥93 | ≤2.0 | ≤1.5 | ≤3.0 | ||
The process of manufacturing fused aluminum oxide was developed at the end of the 19th century and involves smelting calcined bauxite and alumina in electric arc furnaces by electrothermal fusion at temperatures of around 2000°C. The resultant fused aluminum oxides are synthetic hard minerals based on α-aluminum oxide.
Fused aluminum oxides show a value of 9 on the Mohs scale of hardness close to diamond (Mohs 10), the hardest known substance. Besides their superior hardness, the characteristics of fused aluminum oxides include sharp-edged grains, great load bearing capacity, a high degree of shock resistance and thermal and chemical stability.
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