Black Fused Alumina
Black fused alumina is a black abrasive containing alumina and iron spinel phases. It is used in resin-bonded wheels, cutting discs and other abrasive applications. Select the grade by grain size, alumina content and intended workpiece.
Specifications, application and selection
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Physical and product data
The following values are transcribed from the product catalog. Confirm acceptance criteria before supply.
| Item | Details |
|---|---|
| Color | Black |
| Crystal system | Trigonal |
| Mohs hardness | 8.0–9.0 |
| Vickers hardness | 2000–2200 (unit not stated in source) |
| True density | ≥3.5 g/cm³ |
Grades and chemical data
Percentages follow the source grade table. Confirm the required size and batch specification.
| Grade | Al₂O₃ % | Fe₂O₃ % | SiO₂ % | TiO₂ % |
|---|---|---|---|---|
| Aggregate 0–1 / 1–3 / 3–5 mm | 70–88 | 4–12 | 10–25 | 2–4 |
| F4–F360 | 65–88 | 6–12 | 12–25 | 2.5–4 |
| P12–P400 | 65–88 | 6–12 | 12–25 | 2.5–4 |
| F400–F1200 | 65–85 | 6–12 | 12–27 | 3–5 |
| P600–P2500 | 65–85 | 6–12 | 12–27 | 3–5 |
Application review and samples
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