Sieve sizes based on ASTM E 11:

mm Inches Sieve Size
75 mm 3 3"
50 mm 2 2"
37.5 mm 1.5 1-1/2"
25.0 mm 1 1"
19.0 mm 0.75 3/4"
9.5 mm 0.375 3/8"
4.75 mm 0.187 No. 4
2.36 mm 0.0937 No. 8
1.18 mm 0.0469 No. 16
600 um 0.0234 No. 30
300 um 0.0117 No. 50
75 um No. 200

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