| Slijtmateriaal | Hardheid | Afmeting in mm |
| Kwartszand | 7 Mohs | 1,0 - 2,0 2,0 - 3,0 0,5 – 3,0 |
| Nonsil | 7-8 Mohs | 1,0 – 2.0 1,0 – 3,0 |
| Amaril | 8,5-9 Mohs | 0,5 - 2,5 1,0 – 2,0 1,0 – 3,0 3,0 – 5,0 3,0 – 6,0 |
| Siliciumcarbide | 9-10 Mohs | 0,5 - 0,7 0,6 - 0,85 0,7 - 1,0 0,8 - 1,2 1,0 - 1,4 1,2 - 1,7 1,0 - 3,0 |