FEPA standard 42-2:2006, Microgrits, powder, F230~F2000 for grains of fused aluminium oxide, silicon carbide and other abrasive materials for bonded abrasives.
Abrasive grade White fused alumina, brown fused alumina, black silicon carbide, green silicon carbide FEPA standard.
| Grits Designation | D3 value max um | D50 Value um | D94 value min um |
| F230 | 82 | 53.0±3 | 34 |
| F240 | 70 | 44.5±2 | 28 |
| F280 | 59 | 36.5±1.5 | 22 |
| F320 | 49 | 29.2±1.5 | 16.5 |
| F400 | 32 | 17.3±1 | 8 |
| F500 | 25 | 12.8±1 | 5 |
| F600 | 19 | 9.3±1 | 3 |
| F800 | 14 | 6.5±1 | 2 |
| F1000 | 10 | 4.5±0.8 | 1 |
| F1200 | 7 | 3.0±0.5 | 1(at 80%) |
| F1500 | 5 | 2.0±0.4 | 0.8(at 80%) |
| F2000 | 3.5 | 1.2±0.3 | 0.5(at 80%) |
