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| Grade | Leading indicator | |||
| AI2O3 | Fe2O3 | SiO2 | TiO2 | |
| A | ≥62 | 6-12 | ≤25 | 2-4 |
| B | ≥80 | 4-8 | ≤10 | 2-4 |
| Density | maximum service temperature | Hardness(mohs) | Melting point | Application | Size | Crystal shape |
| 3.5g/cm3 | 1850ºC | 9 | 2050ºC | Polishing, grinding, sanding, sandblasting | 12--320mesh | Trigonal crystal system |
Key differences between various types.
1)Aluminum content is one of the vital differences between white, brown and black corundums. White corundum contains more than 99% aluminum. Black corundum contains 45-75% aluminum. Brown corundum contains 75-94% aluminum.
2) Hardness. White corundum has the highest hardness. Brown corundum has average hardness. The hardness of black corundum considered to be minimal among these three types of corundum.
3) Different colors. Black corundum has metallic black color. Brown corundum is brownish red. White corundum is transparent and has white color.
4) Different Uses. White one is used for the manufacturing of advanced refractory materials and precision polishing and grinding. Brown corundum is used for sandblasting and rust removal. Black corundum is cost effective and mainly used for rough polishing and non-slippery and wear resistant floor aggregates.
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