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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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