FEPA standard 42-2:2006. Microgrits F230~F2000 for grains of fused aluminium oxide, silicon carbide and other abrasive materials for bonded abrasives.
| Grit Designation Grit |
d3 value max μm |
d50 value μm |
d94 value min μm |
| F 230 | 82 | 53.0 ± 3 | 34 |
| F 240 | 70 | 44.5 ± 2 | 28 |
| F 280 | 59 | 36.5 ± 1.5 | 22 |
| F 320 | 49 | 29.2 ± 1.5 | 16.5 |
| F 360 | 40 | 22.8 ± 1.5 | 12 |
| F 400 | 32 | 17.3 ± 1 | 8 |
| F 500 | 25 | 12.8 ± 1 | 5 |
| F 600 | 19 | 9.3 ± 1 | 3 |
| F 800 | 14 | 6.5 ± 1 | 2 |
| F 1000 | 10 | 4.5 ± 0.8 | 1 |
| F 1200 | 7 | 3.0 ± 0.5 | 1 (at 80%) |
| F 1500 | 5 | 2.0 ± 0.4 | 0.8 (at 80%) |
| F 2000 | 3.5 | 1.2 ± 0.3 | 0.5 (at 80%) |
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