Black Fused Alumina (BFA) is an artificial abrasive produced by smelting low-grade bauxite and iron filings in a high-temperature electric arc furnace (above 2000°C). Its primary chemical composition includes aluminum oxide (Al₂O₃ 70-85%) and iron oxide (Fe₂O₃ 7-15%), with a Mohs hardness of approximately 8.5-9.0. The crystals appear black or dark gray, exhibiting high toughness, heat resistance, and excellent impact resistance. Compared to brown and white fused alumina, BFA has slightly lower hardness but offers superior wear resistance and lower cost, making it ideal for medium-to-low intensity grinding and surface treatment.

In industrial applications, BFA is widely used for:

• Polishing: Fine polishing of stainless steel, glass, and stone
• Abrasive Coatings: Manufacturing coated abrasives like sandpaper and abrasive belts
• Sandblasting: Rust and scale removal on metal surfaces, especially where high surface finish is not critical
• Refractory Materials: As aggregates in castables or firebricks

Due to its cost-effectiveness and versatility, BFA is extensively applied in hardware processing, construction materials, automotive parts, and other industries, making it a highly economical industrial abrasive.

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