Particle Size Comparator

US Sieve NumberMicron OpeningAstm 11 ToleranceOpening Inches
25
710
+/-30um
0.0278
30
600
+/-25um
0.0234
35
500
+/-20um
0.0197
40
420
+/-19um
0.0165
45
350
+/-16um
0.0139
50
300
+/-14um
0.0117
60
250
+/-12um
0.0098
80
180
+/-9um
0.007
100
150
+/-8um
0.0059
120
125
+/-7um
0.0049
140
106
+/-6um
0.0041
170
90
+/-5um
0.0035
200
75
+/-5um
0.0029
230
63
+/-4um
0.0025
270
53
+/-4um
0.0021
325
45
+/-3um
0.0017
400
38
+/-3um
0.0015
500
25