Mean Diameter of white fused alumina FEPA standard
White Fused alumina was made from the high quality alumina by melting above 2000 in the electric arc furnace and cooling. It is white with the main crystal phase α-Al2O3.
Sizes of white fused alumina standard:F4 F5 F6 F7 F8 F10 F12 F14 F16 F20 F22 F24 F30 F36 F40 F46 F54 F60 F70 F80 F90 F100 F120 F150 F180 F220 F320 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 F2000
Mean diameter of above sizes:
| Macrogrits | Microgrits | |||
| Grit designation | Mean Diameter in µm | Grit designation | Mean grain size ds50-value in μm | |
| F4 | 4890 | F230 | 53.0±3.0 | |
| F5 | 4125 | F240 | 44.5±2.0 | |
| F6 | 3460 | F280 | 36.5±1.5 | |
| F7 | 2900 | F320 | 29.2±1.5 | |
| F8 | 2460 | F360 | 22.8±1.5 | |
| F10 | 2085 | F400 | 17.3±1.0 | |
| F12 | 1765 | F500 | 12.8±1.0 | |
| F14 | 1470 | F600 | 9.3±1.0 | |
| F16 | 1230 | F800 | 6.5±1.0 | |
| F20 | 1040 | F1000 | 4.5±0.8 | |
| F22 | 885 | F1200 | 3.0±0.5 | |
| F24 | 745 | F1500 | 2.0±0.4 | |
| F30 | 625 | F2000 | 1.2±0.3 | |
| F36 | 525 | |||
| F40 | 438 | |||
| F46 | 370 | |||
| F54 | 310 | |||
| F60 | 260 | |||
| F70 | 218 | |||
| F80 | 185 | |||
| F90 | 154 | |||
| F100 | 129 | |||
| F120 | 109 | |||
| F150 | 82 | |||
| F180 | 69 | |||
| F220 | 58 | |||
