Mesh sizes have traditionally been measured by the number of wires per square inch used to sieve the material. This table gives a grit size measurement for the mesh/grit numbers in common use.
Mesh = Mesh opening (mm)
12 = 1.5240
14 = 1.2954
20 = 0.8636
30 = 0.5156
40 = 0.3810
50 = 0.2794
60 = 0.2337
80 = 0.1778
100 = 0.1397
120 = 0.1168
200 = 0.0737
325 = 0.0432
400 = 0.037
625 = 0.020
1200=0.012
2500=0.005
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