Bang Chuyen Doi Don Vi Sàng
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Particle Size Conversion Sieve Designation Nominal Sieve Opening Standard Mesh inches mm Microns 25.4 mm 1 in. 1 25.4 25400 22.6 mm 7/8 in. 0.875 22.6 22600 19.0 mm 3/4 in. 0.75 19 19000 16.0 mm 5/8 in. 0.625 16 16000 13.5 mm 0.530 in. 0.53 13.5 13500 12.7 mm 1/2 in. 0.5 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 8000 6.73 mm 0.265 in. 0.265 6.73 6730 6.35 mm 1/4 in. 0.25 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 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 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 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 0.5 500 0.420 mm No. 40 0.0165 0.42 420 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 0.25 250 0.210 mm No. 70 0.0083 0.21 210 0.177 mm No. 80 0.007 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
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Bang chuyen doi don vi sang
Transcript of Bang Chuyen Doi Don Vi Sàng
Sheet1Particle Size ConversionPowders and granular materials
are sometimes described as having a certain mesh size (e.g. 30 mesh
sand). By itself, this type of description is somewhat ambiguous.
More precise specifications will indicate that a material will pass
through some specific mesh (that is, have a maximum size; larger
pieces won't fit through this mesh) but will be retained by some
specific tighter mesh (that is, a minimum size; pieces smaller than
this will have passed through the mesh). This type of description
establishes a range of particle sizes.Sieve DesignationNominal
Sieve OpeningStandardMeshinchesmmMicrons25.4 mm1 in.125.42540022.6
mm7/8 in.0.87522.62260019.0 mm3/4 in.0.751919000PHN B C HT16.0
mm5/8 in.0.6251616000Vt liu dng ht v dng bt i khi c m t bng c sng
no (th d: ct mt 30 - 30 mesh). Kiu m t ny, t n, hi m h 1 cht. Thng
s k thut chnh xc hn s ch ra 1 vt liu s i qua 1 vi sng tiu chun
(ngha l, c 1 kch thc max; cc ht ln hn khng th i qua sng ny) nhng
cng s b gi li bi 1 vi sng tiu chun st hn (ngha l, c 1 kch thc min;
cc ht nh hn kch thc ny s i qua sng). Kiu m t ny thnh lp 1 di cc kch
thc (c) ht.13.5 mm0.530 in.0.5313.51350012.7 mm1/2
in.0.512.71270011.2 mm7/16 in.0.43811.2112009.51 mm3/8
in.0.3759.5195108.00 mm5/16 in.0.312880006.73 mm0.265
in.0.2656.7367306.35 mm1/4 in.0.256.3563505.66 mmNo.3
1/20.2235.665660One notation for indicating particle size
distribution using mesh size is to use + and - designations. A "+"
before the sieve mesh indicates the particles are retained by the
sieve, while a "-" before the sieve mesh indicates the particles
pass through the sieve. This means that typically 90% or more of
the particles will have mesh sizes between the two values.4.76
mmNo. 40.1874.7647604.00 mmNo. 50.157440003.36 mmNo.
60.1323.3633602.83 mmNo. 70.1112.8328302.38 mmNo.
80.09372.3823802.00 mmNo. 100.078722000Mt k hiu ch s phn b c ht dng
c sng l s dng cc k hiu + v -. Du + ng trc mt sng ngha l cc ht b gi
li bi ry ny, cn du - trc l sng ngha l cc ht i qua ry ny. iu ny c
ngha l ni chung 90% hoc nhiu hn lng ht s c cc c sng nm gia 2 gi tr
ny.1.68 mmNo. 120.06611.6816801.41 mmNo. 140.05551.4114101.19 mmNo.
160.04691.1911901.00 mmNo. 180.039411000For instance, if the
particle size of a material is described as -80/+170 (or could also
be written -80 +170), then 90% or more of the material will pass
through an 80 mesh sieve and be retained by a 170 mesh sieve. Using
the conversion chart below, the resulting particles will have a
range of diameters between 0.089 and 0.178 mm (89 and 178
micrometers).0.841 mmNo. 200.03310.8418410.707 mmNo.
250.02780.7077070.595 mmNo. 300.02340.5955950.500 mmNo.
350.01970.55000.420 mmNo. 400.01650.42420Chng hn nh, nu kch thc ht
ca 1 vt liu c m t l -80/+170 (hoc cng c th vit -80 +170), th 90%
hay nhiu hn vt liu ny s i qua ry mt 80 (80 mesh) v b gi li bi ry mt
170. Dng chuyn di, cc ht tra c s c 1 di ng knh nm gia 0.089 v
0.178mm (89 v 178m).0.354 mmNo. 450.01390.3543540.297 mmNo.
500.01170.2972970.250 mmNo. 600.00980.252500.210 mmNo.
700.00830.212100.177 mmNo. 800.0070.1771770.149 mmNo.
1000.00590.1491490.125 mmNo. 1200.00490.1251250.105 mmNo.
1400.00410.1051050.088 mmNo. 1700.00350.088880.074 mmNo.
2000.00290.074740.063 mmNo. 2300.00250.063630.053 mmNo.
2700.00210.053530.044 mmNo. 3250.00170.044440.037 mmNo.
4000.00150.03737Larger 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.
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