`
`Particle Size - US Sieve Series and Tyler Mesh Size
`Equivalents
`
`Background
`Sieving or screening is a method of separating a mixture or grains or particles into 2 or more size fractions, the over sized
`materials are trapped above the screen, while undersized materials can pass through the screen.
`
`Sieves can be used in stacks, to divide samples up into various size fractions and hence determine particle size distributions.
`
`Sieves and screen are usually used for larger particle sized materials i.e., greater than approximately 50µm (0.050mm).
`Size Equivalents
`Two scales that are used to classify particle sizes are the US Sieve Series and Tyler Equivalent, sometimes called Tyler Mesh
`Size or Tyler Standard Sieve Series. The most common mesh opening sizes for these scales are given in the table below and
`provide an indication of particle sizes.
`
`US Sieve
`Size
`
`-
`
`-
`
`No. 3½
`
`No. 4
`
`No. 5
`
`No. 6
`
`No. 7
`
`No. 8
`
`No.10
`
`No. 12
`
`No. 14
`
`No. 16
`
`No. 18
`
`No. 20
`
`Tyler Equivalent
`
`Opening
`
`2½ Mesh
`
`3 Mesh
`
`3½ Mesh
`
`4 Mesh
`
`5 Mesh
`
`6 Mesh
`
`7 Mesh
`
`8 Mesh
`
`9 Mesh
`
`10 Mesh
`
`12 Mesh
`
`14 Mesh
`
`16 Mesh
`
`20 Mesh
`
`mm
`
`8.00
`
`6.73
`
`5.66
`
`4.76
`
`4.00
`
`3.36
`
`2.83
`
`2.38
`
`2.00
`
`1.68
`
`1.41
`
`1.19
`
`1.00
`
`0.841
`
`in
`
`0.312
`
`0.265
`
`0.233
`
`0.187
`
`0.157
`
`0.132
`
`0.111
`
`0.0937
`
`0.0787
`
`0.0661
`
`0.0555
`
`0.0469
`
`0.0394
`
`0.0331
`
`Saved from URL: http://www.azom.com/article.aspx?ArticleID=1417
`
`P
`
`/21
`
`1
`
`EX 1016
`IPR of U.S. Pat. No. 7,829,595
`
`
`
`Particle Size - US Sieve Series and Tyler Mesh Size Equivalents
`
`No. 25
`
`No. 30
`
`No. 35
`
`No. 40
`
`No. 45
`
`No. 50
`
`No. 60
`
`No. 70
`
`No. 80
`
`No.100
`
`No. 120
`
`No. 140
`
`No. 170
`
`No. 200
`
`No. 230
`
`No. 270
`
`No. 325
`
`No. 400
`
`24 Mesh
`
`28 Mesh
`
`32 Mesh
`
`35 Mesh
`
`42 Mesh
`
`48 Mesh
`
`60 Mesh
`
`65 Mesh
`
`80 Mesh
`
`100 Mesh
`
`115 Mesh
`
`150 Mesh
`
`170 Mesh
`
`200 Mesh
`
`250 Mesh
`
`270 Mesh
`
`325 Mesh
`
`400 Mesh
`
`0.707
`
`0.595
`
`0.500
`
`0.420
`
`0.354
`
`0.297
`
`0.250
`
`0.210
`
`0.177
`
`0.149
`
`0.125
`
`0.105
`
`0.088
`
`0.074
`
`0.063
`
`0.053
`
`0.044
`
`0.037
`
`0.0278
`
`0.0234
`
`0.0197
`
`0.0165
`
`0.0139
`
`0.0117
`
`0.0098
`
`0.0083
`
`0.0070
`
`0.0059
`
`0.0049
`
`0.0041
`
`0.0035
`
`0.0029
`
`0.0025
`
`0.0021
`
`0.0017
`
`0.0015
`
`The mesh number system is a measure of how many openings there are per linear inch in a screen. Sizes vary by a factor of √2.
`This can easily be determined as screens are made from wires of standard diameters, however, opening sizes can vary slightly
`due to wear and distortion.
`
`US sieve sizes differ from Tyler Screen sizes in that thay are arbitrary numbers.
`
`Primary author: AZoM.com
`
`Date Added: May 15, 2002 | Updated: Jun 11, 2013
`
`Saved from URL: http://www.azom.com/article.aspx?ArticleID=1417
`
`P
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`
`2
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