Mesh Sizes and Openings

Mesh Size is the number of adjacent holes in one inch length of a sieve:

Mesh Size/Opening Reference Table and Diagram

Mesh Size Sieve Openings [µm] US Grade Market Grade ASTM E 11-61 British Standard BS 410:1962 10 2215 1910 2000 1680 12 1890 1520 1680   14 1565 1300 1410 1200 16 1330 1130 1190 1000 18 1135 980 1000   20 970 860 841   24   700     25 815   707 600 30 695 520 595 500 35 585 450 500   40 502 380 420   45 425   354   50 363 280 297   60 306 230 250 250 70 263 200 210   80 227 180 177   100 192 160 149 150 110   129.5     120 163 117 125 125 140 141 107 105   150   104   105 160   96.5     170 122 88.9 88 90 180   83.8     200 103 73.7 74 75 230 89   63   250   61     270 76 53.3 53   325 66 43.2 44   400 57 37 37

Mesh/Micrometer Calculator (only defined between 30 - 140 mesh, 75 - 600 µm)

Expected Flow for Packed Columns