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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
StandardInchesMeshmmMicrons
25.4mm 1 in. 21.00  25.4 225400
222.6mm  7/8 in. 20.875  22.6 222600
219.0mm  3/4 in. 20.750  19.0 219000
216.0mm  5/8 in. 20.625  16.0 216000
213.5mm  0.530 in. 20.530  13.5 213500
212.7mm  1/2 in. 20.500  12.7 212700
211.2mm  7/16 in. 20.438  11.2 211200
29.51mm  3/8 in. 20.375  9.51 29510
28.00mm  5/16 in. 20.312  8.00 28000
26.73mm  0.265 in. 20.265  6.73 26730
26.35mm  1/4 in. 20.250  6.35 26350
25.66mm  No. 3 1/2 20.223  5.66 25660
24.76mm  No. 4 20.187  4.76 24760
24.00mm  No. 5 20.157  4.00 24000
23.36mm  No. 6 20.132  3.36 23360
22.83mm  No. 7 20.111  2.83 22830
22.38mm  No. 8 20.0937  2.38 22880
22.00mm  No. 10 20.0787  2.00 22000
21.68mm  No. 12 0.0661  1.68 21680
21.41mm  No. 14 20.0555  1.41 21410
1.19mm  No. 16 20.0496  1.19 21190
21.00mm  No. 18 20.0394  1.00 21000
2841Ám  No. 20 20.0331  0.841 2841
2707Ám  No. 25 20.0278  0.707 2707
2595Ám No. 30 20.0234  0.595 2595
2500Ám  No. 35 20.0197  0.500 2500
2420Ám  No. 40 20.0165  0.420 2420
2345Ám  No. 45 0.0139  0.345 2345
2297Ám  No. 50 20.0117  0.297 2297
2250Ám  No. 60 20.0098  0.250 2250
2210Ám  No. 70 20.0083  0.210 2210
2177Ám  No. 80 20.0070  0.177 2177
2149Ám  No. 100 20.0059  0.149 2149
2125Ám  No. 120 20.0049  0.125 2125
2105Ám  No. 140 20.0041  0.105 2105
288Ám  No. 170 20.0035  0.088 288
274Ám  No. 200 20.0029  0.074 274
263Ám  No. 230 20.0025  0.063 263
253Ám  No. 270 20.0021  0.053 253
244Ám  No. 325 20.0017  0.044 244
237Ám  No. 400 20.0015  0.037 237
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.