Chemistry infolab reagents and resources
Mesh sizes, sieve opening, sieve numbers.

Particle size conversions.
    Back to Homepage


Standard sieve Designations

Standard sieves 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  

Copyright © 1995-2003,  Process Associates of America.  All Rights Reserved.

Particle Size Conversion

Sieve Designation Nominal Sieve Opening
StandardMeshInchesmmMicrons
 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  0.354  354
 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.