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- Mesh Size

Particle Size – US Sieve Series and Tyler Mesh Size Equivalents
Background Sieving or screening is a method of separating a mixture or grains or particles into 2 or more sizefractions, the over sized materials are trapped above the screen, while undersized materials can pass through the screen. Sieves can be used in stacks, to divide samples up into various size fractions andhence determine particle size distributions. Sieves and screen are usually used for larger particle sized materials i.e., greater than approximately 50µm (0.050mm). Size Equivalents Two scales that areused to classify particle sizes are the US Sieve Series and Tyler Equivalent, sometimes called Tyler Mesh Size or Tyler Standard Sieve Series. The most common mesh opening sizes for these scales aregiven in the table below and provide an indication of particle sizes. US Sieve Size No. 3½ No. 4 No. 5 No. 6 No. 7 No. 8 No.10 No. 12 No. 14 No. 16 No. 18 No. 20 No. 25 No. 30 No. 35 No. 40 No. 45 No.50 No. 60 No. 70 No. 80 Tyler Equivalent mm 2½ Mesh 3 Mesh 3½ Mesh 4 Mesh 5 Mesh 6 Mesh 7 Mesh 8 Mesh 9 Mesh 10 Mesh 12 Mesh 14 Mesh 16 Mesh 20 Mesh 24 Mesh 28 Mesh 32 Mesh 35 Mesh 42 Mesh 48 Mesh 60Mesh 65 Mesh 80 Mesh 8.00 6.73 5.66 4.76 4.00 3.36 2.83 2.38 2.00 1.68 1.41 1.19 1.00 0.841 0.707 0.595 0.500 0.420 0.354 0.297 0.250 0.210 0.177 Opening in 0.312 0.265 0.233 0.187 0.157 0.132 0.1110.0937 0.0787 0.0661 0.0555 0.0469 0.0394 0.0331 0.0278 0.0234 0.0197 0.0165 0.0139 0.0117 0.0098 0.0083 0.0070file://///Fs/agm%20file%20server/Engineering/Department...tpub/wwwroot/technical%20info/Mesh_Size_Equivalents.htm (1 of 2)11/27/2006 1:35:42 PM

- Mesh Size

No.100 No. 120 No. 140 No. 170 No. 200 No. 230 No. 270 No. 325 No. 400

100 115 150 170 200 250 270 325 400

Mesh MeshMesh Mesh Mesh Mesh Mesh Mesh Mesh

0.149 0.125 0.105 0.088 0.074 0.063 0.053 0.044 0.037

0.0059 0.0049 0.0041 0.0035 0.0029 0.0025 0.0021 0.0017 0.0015

The mesh number system is a measure of...
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