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The mean diameters of macrogrits shown in the table are estimated and for information only, the FEPA "P" standard defines them as a range and not a single value.
MACROGRITS |
MICROGRITS |
Grit designation |
Mean
Diameter
in µ |
Grit
Number |
Mean
Diameter
ds 50 µm |
P12 |
1815 |
P240 |
58.5 ± 2 |
P16 |
1324 |
P280 |
52.2 ± 2 |
P20 |
1000 |
P320 |
46.2 ± 1.5 |
P24 |
764 |
P360 |
40.5 ± 1.5 |
P30 |
642 |
P400 |
35.0 ± 1.5 |
P36 |
538 |
P500 |
30.2 ±1.5 |
P40 |
425 |
P600 |
25.8 ± 1 |
P50 |
336 |
P800 |
21.8 ± 1 |
P60 |
269 |
P1000 |
18.3 ± 1 |
P80 |
201 |
P1200 |
15.3 ± 1 |
P100 |
162 |
P1500 |
12.6 ± 1 |
P120 |
125 |
P2000 |
10.3 ± 0.8 |
P150 |
100 |
P2500 |
8.4 ± 0.5 |
P180 |
82 |
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P220 |
68 |
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The particle size distribution of macrogrits is determined by sieving, while the microgrits have been measured by sedimentation (US-sedimentometer).
More information can be found in the FEPA-standard 43-1984 R 1993 and in ISO 6344.
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