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Size Reduction Equipments

Powders and granular materials are sometimes described as having a certain mesh or micron size. By itself, this type of description is somewhat ambiguous. More precise specifications will indicate that a material will pass through some specific mesh or micron screen (that is, have a maximum size; larger pieces won't fit through this mesh or micron) but will be retained by some specific tighter mesh or micron (that is, a minimum size; pieces smaller than this will have passed through the mesh or micron). This type of description establishes a range of particle sizes.

Particle size conversion chart

B.S.S. MESH A.S.T.M. MESH I.S.S. MESH MICRON IN NM
4 5 - 4000 4.00
6 7 280 2812 2.81
8 10 200 2057 2.05
10 12 170 1680 1.68
12 14 150 1405 1.40
14 16 120 1240 1.20
16 18 100 1003 1.00
18 20 85 850 0.85
22 25 70 710 0.71
30 35 50 500 0.50
36 40 40 420 0.42
44 45 35 355 0.35
52 50 30 300 0.30
60 60 25 250 0.25
72 70 20 210 0.21
85 80 18 180 0.18
100 100 15 150 0.15
120 120 12 125 0.12
150 140 10 105 0.10
170 170 9 90 0.09
200 200 8 75 0.075
240 230 6 63 0.063
300 270 5 53 0.053
350 325 4 45 0.045
400 400 - 37 0.037
500 500 - 35 0.025
625 625 - 20 0.020
800 800 15 0.015
1250 1250 - 10 0.010
2500 2500 - 5 0.005

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