The mean diameters of macrogrits shown in the table are estimated and for information only, the FEPA "F" standard defines them as a range and not a single value.
MACROGRITS |
|
MICROGRITS |
Grit designation |
Mean
Diameter
in µm |
|
Grit
Number |
Mean
Diameter
ds 50 µm |
F4 |
4890 |
|
F230 |
53.0 ± 3 |
F5 |
4125 |
|
F240 |
44.5 ± 2 |
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 |
F12 |
1765 |
|
F500 |
12.8 ± 1 |
F14 |
1470 |
|
F600 |
9.3 ± 1 |
F16 |
1230 |
|
F800 |
6.5 ± 1 |
F20 |
1040 |
|
F1000 |
4.5 ± 0.8 |
F22 |
885 |
|
F1200 |
3.0 ± 0.5 |
F24 |
745 |
|
|
|
F30 |
625 |
|
|
|
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 |
|
|
|
The particle size distribution of macrogrits is determined by sieving, while the microgrits have been measured by sedimentation (photosedimentometer).
More information can be found in the FEPA-standard 42-1984 R 1993 and in ISO 8486.
|
