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`Chemistry > Stockroom Reagents > Learning Center > Lab Basics Technical Library > Particle Size Conversion
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`Chemicals - Technical Library
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`Particle Size Conversion Table
`Sieve Designation
`Nominal Sieve Opening
`Standard
`Mesh
`inches
`mm
`Microns
`25.4 mm
`1 in.
`1.00
`25.4
`25400
`22.6 mm
`7/8 in.
`0.875
`22.6
`22600
`19.0 mm
`3/4 in.
`0.750
`19.0
`19000
`16.0 mm
`5/8 in.
`0.625
`16.0
`16000
`13.5 mm
`0.530 in.
`0.530
`13.5
`13500
`12.7 mm
`1/2 in.
`0.500
`12.7
`12700
`11.2 mm
`7/16 in.
`0.438
`11.2
`11200
`9.51 mm
`3/8 in.
`0.375
`9.51
`9510
`8.00 mm
`5/16 in.
`0.312
`8.00
`8000
`6.73 mm
`0.265 in.
`0.265
`6.73
`6730
`6.35 mm
`1/4 in.
`0.250
`6.35
`6350
`5.66 mm
`No.3 1/2
`0.223
`5.66
`5660
`4.76 mm
`No. 4
`0.187
`4.76
`4760
`4.00 mm
`No. 5
`0.157
`4.00
`4000
`3.36 mm
`No. 6
`0.132
`3.36
`3360
`2.83 mm
`No. 7
`0.111
`2.83
`2830
`2.38 mm
`No. 8
`0.0937
`2.38
`2380
`2.00 mm
`No. 10
`0.0787
`2.00
`2000
`1.68 mm
`No. 12
`0.0661
`1.68
`1680
`1.41 mm
`No. 14
`0.0555
`1.41
`1410
`1.19 mm
`No. 16
`0.0469
`1.19
`1190
`1.00 mm
`No. 18
`0.0394
`1.00
`1000
`0.841 mm
`No. 20
`0.0331
`0.841
`841
`0.707 mm
`No. 25
`0.0278
`0.707
`707
`0.595 mm
`No. 30
`0.0234
`0.595
`595
`0.500 mm
`No. 35
`0.0197
`0.500
`500
`0.420 mm
`No. 40
`0.0165
`0.420
`420
`0.354 mm
`No. 45
`0.0139
`0.354
`354
`0.297 mm
`No. 50
`0.0117
`0.297
`297
`0.250 mm
`No. 60
`0.0098
`0.250
`250
`0.210 mm
`No. 70
`0.0083
`0.210
`210
`0.177 mm
`No. 80
`0.0070
`0.177
`177
`0.149 mm
`No. 100
`0.0059
`0.149
`149
`0.125 mm
`No. 120
`0.0049
`0.125
`125
`0.105 mm
`No. 140
`0.0041
`0.105
`105
`0.088 mm
`No. 170
`0.0035
`0.088
`88
`0.074 mm
`No. 200
`0.0029
`0.074
`74
`0.063 mm
`No. 230
`0.0025
`0.063
`63
`0.053 mm
`No. 270
`0.0021
`0.053
`53
`0.044 mm
`No. 325
`0.0017
`0.044
`44
`0.037 mm
`No. 400
`0.0015
`0.037
`37
`Larger sieve openings (1 in. to 1/4 in.) have been designated by a sieve "mesh" size that corresponds to t
`size of the opening in inches. Smaller sieve "mesh" sizes of 3 1/2 to 400 are designated by the number o
`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 mater
`will pass through a 4-mesh sieve (particles smaller than 4.76 mm) and be retained by a 40-mesh sieve
`
`http://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/particle...
`
`Enzo Exhibit 2025
`BD v. Enzo
`Case IPR2017-00172
`
`Exhibit 2025 Page 1
`
`
`
`Particle Size Conversion Table | Sigma-Aldrich
`
`Page 2 of 2
`
`(particles larger than 0.420 mm). If a material is described as -40 mesh, then 90% or more of the materia
`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.
`Return to LabBasics Technical Library homepage
`
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`http://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/particle...
`
`Exhibit 2025 Page 2
`
`
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