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- FEPA Powder Size Specification Synonyms:
FEPA, federation of european producers of abrasive products, grit size, microgrits, designation, standard values micro-f series, eppendorf photosedimentometer, photosedimentromety, size limits, grading, lapping, polishing. macrogrit, microgrit, mean diameter
- FEPA Powder Size Specifications:
| Grit Size |
3% max.
larger than, mcm |
50% min.
in size range, mcm |
94% min.
larger than, mcm |
Grit Size |
3% max.
larger than, mcm |
50% min.
in size range, mcm |
94% min.
larger than, mcm |
| F12 |
2000 |
N/A |
1400 |
F120 |
125 |
N/A |
90 |
| F14 |
1700 |
N/A |
1180 |
F150 |
106 |
N/A |
63 |
| F16 |
1400 |
N/A |
1000 |
F180 |
90 |
N/A |
53 |
| F20 |
1180 |
N/A |
850 |
F220 |
75 |
50.0 - 56.0 |
45 |
| F24 |
850 |
N/A |
600 |
F240 |
70 |
42.5 - 46.5 |
28 |
| F30 |
410 |
N/A |
500 |
F280 |
59 |
35.0 - 38.0 |
22 |
| F36 |
600 |
N/A |
425 |
F320 |
49 |
27.7 - 30.7 |
16.5 |
| F40 |
500 |
N/A |
355 |
F360 |
40 |
21.3 - 24.3 |
12 |
| F46 |
425 |
N/A |
300 |
F400 |
32 |
16.3 - 18.3 |
8 |
| F54 |
355 |
N/A |
250 |
F500 |
25 |
11.8 - 13.8 |
5 |
| F60 |
300 |
N/A |
212 |
F600 |
19 |
8.3 - 10.3 |
3 |
| F70 |
250 |
N/A |
180 |
F800 |
14 |
5.5 - 7.5 |
2 |
| F80 |
212 |
N/A |
150 |
F1000 |
10 |
3.7 - 5.3 |
1 |
| F90 |
180 |
N/A |
125 |
F1200 |
7 |
2.5 - 3.5 |
1 |
| F100 |
150 |
N/A |
106 |
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- Macrogrit And Microgrit Mean Diameter Conversion:
|
MACROGRITS
|
|
MICROGRITS
|
|
Grit
designation
|
Mean
Diameter
in µm
|
|
Grit
designation
|
Mean grain
size ds50-value in μm
|
|
F 4
|
4890
|
|
F 230
|
53.0 ± 3
|
|
F 5
|
4125
|
|
F 240
|
44.5 ± 2
|
|
F 6
|
3460
|
|
F 280
|
36.5 ± 1.5
|
|
F 7
|
2900
|
|
F 320
|
29.2 ± 1.5
|
|
F 8
|
2460
|
|
F 360
|
22.8 ± 1.5
|
|
F 10
|
2085
|
|
F 400
|
17.3 ± 1
|
|
F 12
|
1765
|
|
F 500
|
12.8 ± 1
|
|
F 14
|
1470
|
|
F 600
|
9.3 ± 1
|
|
F 16
|
1230
|
|
F 800
|
6.5 ± 1
|
|
F 20
|
1040
|
|
F 1000
|
4.5 ± 0.8
|
|
F 22
|
885
|
|
F 1200
|
3.0 ± 0.5
|
|
F 24
|
745
|
|
|
2.0 ± 0.4
|
|
F 30
|
625
|
|
|
1.2 ± 0.3
|
|
F 36
|
525
|
|
|
|
|
F 40
|
438
|
|
|
|
|
F 46
|
370
|
|
|
|
|
F 54
|
310
|
|
|
|
|
F 60
|
260
|
|
|
|
|
F 70
|
218
|
|
|
|
|
F 80
|
185
|
|
|
|
|
F 90
|
154
|
|
|
|
|
F 100
|
129
|
|
|
|
|
F 120
|
109
|
|
|
|
|
F 150
|
82
|
|
|
|
|
F 180
|
69
|
|
|
|
|
F 220
|
58
|
|
- Warning: The diameters of grits shown in the table are estimated and for information only, the FEPA "F" standard defines them as a range and not a single value.
- FEPA= Federation of European Producers of Abrasives
- The 3% and 94% limits fix the relative slope of the size distribution curve for a particular size determined by photosedimentromety.
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