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U.S. Mesh vs. Micron

Filter media is sometimes rated in U.S. Mesh instead of microns. This gauge standard is the number of openings per linear inch using standard wire diameters. Wire mesh measures the number of wires (or threads) per linear inch, not the size of the holes between them. As the number of wires per inch goes up, the size of the holes (in microns) goes down.

 

The chart below roughly converts between U.S. Mesh, microns, and fractions of an inch. There is no simple formula to convert between microns and wire mesh because it would have to account for changing wire diameter.


U.S. Mesh Microns Inches
10 2000 0.0787
12 1680 0.0661
14 1410 0.0555
16 1190 0.0469
18 1000 0.0394
20 840 0.0311
25 710 0.0280
30 590 0.0232
35 500 0.0197
40 420 0.0165
45 350 0.0137
50 297 0.0117
60 250 0.0098
70 210 0.0083
80 177 0.0070
100 149 0.0059
120 125 0.0049
140 105 0.0041
170 88 0.0035
200 74 0.0029
230 62 0.0024
270 53 0.0021
325 44 0.0017
400 37 0.0015
550 25 0.0009
800 15 0.0006
1250 10 0.0004

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