| Customization: | Available |
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| Natural Abrasive Type: | Fused Alumina |
| Artificial Abrasive Type: | Other |
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Black Aluminum Oxide is produced by fusing bauxite, iron oxide and other elements in an arc-furnace. The resulting product has a moderate hardness, high toughness, high temperature resistance, good thermal stability, and excellent self-sharpening.
Black Aluminum Oxide, due to its thermal stability and low heat generation when polishing, is used to polish metal pieces, especially stainless steel, producing a high smooth finish with little surface discoloration. It is also used in resin bonded abrasives, blasting applications, as anti-skid surfacing material, abrasive belts, flap wheels, fiber wheels, and other polishing and lapping applications.
| 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.
| 1. Preferred material of the slip-prevented road and coal pits warehousing. | |||
| 2. Manufacturing resin-cutting slice, edges and corners grinding and coated abrasives. | |||
| 3. Light ornament, plastic and hardware polishing, and also applicable to the sand blasting. | |||
| 4. Suitable for stainless steel work piece polishing and abrading and making the whetstone and polishing paste. | |||
| 5. Used for the bicycle, motorcycle, sewing machine, and clock parts. |
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