Black fused alumina (BFA) (also known as low-aluminum corundum sand, iron sand powder) is a high-performance abrasive made from high-quality bauxite, a new type of polishing material with a unique black color.
Excellent performance: With moderate hardness, good toughness and strong self-sharpening properties, black corundum accumulates less grinding heat on the surface of various workpieces, is not easy to burn the surface of the workpiece, has high finish and slight color change.
Low contamination: Its low iron content minimizes the risk of contamination in sensitive applications.
Cost-effective solution: Balancing high performance with affordability makes it a wise choice for manufacturers.
Black Fused Alumina Applications:
Cutting wheels: for making resin cutting discs, resin grinding discs, ultra-thin discs, resin grinding wheels and other resin abrasives.
Coated abrasives and nylon wheel abrasives: emery cloth, flap wheels, abrasive belts, sponge blocks, nylon abrasive belts, nylon take-up wheels, laminated wheels and other porous long fiber abrasives.
Polishing and finishing: for polishing bamboo, glass, copper and aluminum alloys, hardware tools, especially stainless steel workpieces.
Anti-slip: for making wear-resistant floor pavement, wear-resistant and anti-slip pavement aggregate.
Physical Properties and Chemical Composition
| Quality Level | Chemical Composition% | |||
| AI2O3 | Fe2O3 | TiO2 | SiO2 | |
| Ordinary | >62 | 6~12 | 2~4 | <25 |
| Top Quality | >80 | 4~8 | 2~4 | <1 |
| Color | Crystal Structure | Hardness(Monhs) | Hardness (Vickers)(kg/cmm2) | |
| Black | Trigonal | 8~9 | 2000-2200 | |
| Melting Point | Maximum operating temperature | True Density | ||
| 2050 | 1850 | >3.5 | ||
| Ordinary Section Sand Size | 3.5-5mm,1-3mm,0.4-1mm,0-1mm | |||
| Ordinary Grit Sand Size | F12-F400 | |||
| Top Quality Section Sand Size | F46-F240 | |||
| Top Quality Grit Sand Size | F280-F1000 | |||
| HS CODE | 2818109000 | |||
Why Choose DOMILL?
With three decades of experience, DOMILL Abrasives offers top-tier Black Fused Alumina that meets rigorous industry standards. Our commitment to consistent quality, bulk availability, and prompt delivery, combined with outstanding customer service, sets us apart.
