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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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