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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

         

         

        P220

         68

         

         

         

        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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