Mesh to Micron Conversion Chart

How to convert mesh into micron, here is some introduction and chart, micron-rated filter meshes
 
TAIZHOU, China - March 29, 2016 - PRLog -- MESH TO MICRON CONVERSION CHART

U.S. MESH  INCHES
MICRONS   MILLIMETERS
3  0.2650  6730  6.730
4  0.1870  4760  4.760
5  0.1570  4000  4.000
6  0.1320  3360  3.360
7  0.1110  2830  2.830
8  0.0937  2380  2.380
10  0.0787  2000  2.000
12  0.0661  1680  1.680
14  0.0555  1410  1.410
16  0.0469  1190  1.190
18  0.0394  1000  1.000
20  0.0331  841  0.841
25  0.0280  707  0.707
30  0.0232  595  0.595
35  0.0197  500  0.500
40  0.0165  400  0.400
45  0.0138  354  0.354
50  0.0117  297  0.297
60  0.0098  250  0.250
70  0.0083  210  0.210
80  0.0070  177  0.177
100  0.0059  149  0.149
120  0.0049  125  0.125
140  0.0041  105  0.105
170  0.0035  88  0.088
200  0.0029  74  0.074
230  0.0024  63  0.063
270  0.0021  53  0.053
325  0.0017  44  0.044
400  0.0015  37  0.037

Mesh Sizes and Microns

What does mesh size mean?
 Figuring out mesh sizes is simple.  All you do is count the number of openings in one inch of screen (in the United States, anyway.)  The number of openings is the mesh size.  So a 4-mesh screen means there are four little squares across one linear inch of screen.  A 100-mesh screen has 100 openings, and so on.  As the number describing the mesh size increases, the size of the particles decreases.   Higher numbers equal finer material.  Mesh size is not a precise measurement of particle size.

What do the minus (-) and plus (+) plus signs mean when describing mesh sizes?  Here's a simple example of how they work.  -200-mesh would mean that all particles smaller than 200-mesh would pass through. +200 mesh means that all the particles 200-mesh or larger are retained.

How fine do screens get?  That depends on the wire thickness.  If you think about it, the finer the weave, the closer the wires get together, eventually leaving no space between them at all. For this reason, beyond 325-mesh particle size is usually described in "microns."

What is a micron?  A micron is another measurement of particle size.  A micron is one-millionth of a meter or one twenty-five thousandth of an inch.

Sieve Mesh #  Inches  Microns  Typical Material
14  .0555  1400  -
28  .028  700  Beach Sand
60  .0098  250  Fine Sand
100  .0059  150  -
200  .0029  74  Portland Cement
325  .0017  44  Silt
400  .0015  37  Plant Pollen
(1200)  .0005  12  Red Blood Cell
(2400)  .0002  6  -
(4800)  .0001  2  Cigarette Smoke

The mesh numbers in parentheses are too small to exist as actual screen sizes; they are estimates included for reference.

This table was adapted from a post made by Ken Kosanke to the PML and previously published in a PGII Bulletin. It has also been modified and edited for use on this site.


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