The so-called mesh size refers to the particle size or fineness of the material, which is generally defined as the size within 1 inch × The number of mesh in an area of 1 inch, that is, the number of mesh of the screen, is defined as the number of mesh through which the material can pass: for example, 200 mesh, that is, the material can pass through 1 inch × A screen with 200 meshes in 1 inch. By analogy, the larger the number of mesh, the finer the particle size of the material; the smaller the number of mesh, the larger the particle size of the material.
Mesh size (standard mesh)
4.75mm 4
4.00mm 5
3.35mm 6
2.80mm 7
2.36mm 8
2.00mm 10
1.70mm 12
1.40mm 14
1.18mm 16
1.00mm 18
0.850mm 20
0.710mm 25
0.600mm 30
0.500mm 35
0.425mm 40
0.355mm 45
0.300mm 50
0.250mm 60
0.212mm 70
0.180mm 80
0.150mm 100
0.125mm 120
0.106mm 140
0.090mm 170
0.0750mm 200
0.0630mm 230
0.0530mm 270
0.0450mm 325
Generally speaking, mesh × Pore size (microns) = 15000. For example, the aperture of the 400 mesh screen is about 38 microns; The pore size of the 500 mesh screen is about 30 microns

0.15mm * 10000 mesh = 15000mm mesh

Mesh micron（ μ m) Mesh micron（ μ m)
2 8000 100 150
3 6700 115 125
4 4750 120 120
5 4000 125 115
6 3350 130 113
7 2800 140 109
8 2360 150 106
10 1700 160 96
12 1400 170 90
14 1180 175 86
16 1000 180 80
18 880 200 75
20 830 230 62
24 700 240 61
28 600 250 58
30 550 270 53
32 500 300 48
35 425 325 45
40 380 400 38
42 355 500 25
45 325 600 23
48 300 800 18
50 270 1000 13
60 250 1340 10
65 230 2000 6.5
70 212 5000 2.6
80 180 8000 1.6
90 160 10000 1.3