| Abrasive materials | Hardness | ||
| Synthetic abrasives | |||
| Synthetic Diamond | 10 | 10,000 | 8,000–10,000 |
| Boron Nitride (cubic) | 10 | 7,300–10,000 | 4,700–10,000 |
| Boron Carbide | 9–10 | 3,300–4,300 | 2,200–5,100 |
| Silico Carbide | 9 | 2,800–3,300 | 2,000–3,700 |
| Alumina | 9 | 2,200 | 2,000–2,600 |