29 June 2012

MESH TO MICRON CONVERSION CHART


(150 mesh filter, 250 mesh filter, how to convert mesh to micron)





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.