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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

 

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

 

 

 

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.

 
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