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Conversion factors

Listed below are links to numerous everyday conversion factors.  These are listed for reference only.

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 0.037 550 0.0009 25 0.025 800 0.0006 15 0.015 1250 0.0002 5 0.005

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.