Standard sieves and Mesh sizes
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Sieves Standard no. Mesh sizes and Designations
See below for Particle size conversions
Mesh Size
(microns)TYLER ASTM-E11 BS-410 DIN-4188 µm Mesh No. Mesh mm 5 2500 2500 0.005 10 1250 1250 0.010 15 800 800 0.015 20 625 625 0.020 22 0.022 25 500 500 0.025 28 0.028 32 0.032 36 0.036 38 400 400 400 40 0.040 45 325 325 350 0.045 50 0.050 53 270 270 300 56 0.056 63 250 230 240 0.063 71 0.071 75 200 200 200 80 0.080 90 170 170 170 0.090 100 0.100 106 150 140 150 112 0.112 125 115 120 120 0.125 140 0.140 150 100 100 100 160 0.160 180 80 80 85 0.180 200 0.200 212 65 70 72 250 60 60 60 0.250 280 0.280 300 48 50 52 315 0.315 355 42 45 44 0.355 400 0.400 425 35 40 36 450 0.450 500 32 35 30 0.500 560 0.560 600 28 30 25
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Particle Size Conversion
Sieve Designation Nominal Sieve Opening Standard Mesh Inches mm Microns 25.4mm 1 in. 1.00 25.4 25400 22.6mm 7/8 in. 0.875 22.6 22600 19.0mm 3/4 in. 0.750 19.0 19000 16.0mm 5/8 in. 0.625 16.0 16000 13.5mm 0.530 in. 0.530 13.5 13500 12.7mm 1/2 in. 0.500 12.7 12700 11.2mm 7/16 in. 0.438 11.2 11200 9.51mm 3/8 in. 0.375 9.51 9510 8.00mm 5/16 in. 0.312 8.00 8000 6.73mm 0.265 in. 0.265 6.73 6730 6.35mm 1/4 in. 0.250 6.35 6350 5.66mm No. 3 1/2 0.223 5.66 5660 4.76mm No. 4 0.187 4.76 4760 4.00mm No. 5 0.157 4.00 4000 3.36mm No. 6 0.132 3.36 3360 2.83mm No. 7 0.111 2.83 2830 2.38mm No. 8 0.0937 2.38 2880 2.00mm No. 10 0.0787 2.00 2000 1.68mm No. 12 0.0661 1.68 1680 1.41mm No. 14 0.0555 1.41 1410 1.19mm No. 16 0.0496 1.19 1190 1.00mm No. 18 0.0394 1.00 1000 841µm No. 20 0.0331 0.841 841 707µm No. 25 0.0278 0.707 707 595µm No. 30 0.0234 0.595 595 500µm No. 35 0.0197 0.500 500 420µm No. 40 0.0165 0.420 420 345µm No. 45 0.0139 0.345 345 297µm No. 50 0.0117 0.297 297 250µm No. 60 0.0098 0.250 250 210µm No. 70 0.0083 0.210 210 177µm No. 80 0.0070 0.177 177 149µm No. 100 0.0059 0.149 149 125µm No. 120 0.0049 0.125 125 105µm No. 140 0.0041 0.105 105 88µm No. 170 0.0035 0.088 88 74µm No. 200 0.0029 0.074 74 63µm No. 230 0.0025 0.063 63 53µm No. 270 0.0021 0.053 53 44µm No. 325 0.0017 0.044 44 37µm No. 400 0.0015 0.037 37 NOTES:
Larger sieve openings (1 in. to 1/4 in.) have been designated by a sieve "mesh" size that corresponds to the size of the opening in inches.
Smaller sieve "mesh" sizes of 3 1/2 to 400 are designated by the number of openings per linear inch in the sieve.
The following convention is used to characterize particle size by mesh designation:
a "+" before the sieve mesh indicates the particles are retained by the sieve; a "-" before the sieve mesh indicates the particles pass through the sieve; typically 90% or more of the particles will lie within the indicated range.
For example, if the particle size of a material is described as -4 +40 mesh, then 90% or more of the material will pass through a 4-mesh sieve (particles smaller than 4.76 mm) and be retained by a 40-mesh sieve (particles larger than 0.420 mm).
If a material is described as -40 mesh, then 90% or more of the material will pass through a 40-mesh sieve (particles smaller than 0.420 mm).
This information is also provided on page T848 of the Aldrich 2003-2004 Catalog/Handbook of Fine Chemicals.
Signature: Dhanlal De Lloyd, Chem. Dept, The University of The West Indies, St. Augustine campus
The Republic of Trinidad and Tobago.
Copyright: delloyd2000© All rights reserved.
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