One of the first steps in defining the right bag filter solution is to determine the required filtration performance of the media.  This is most-often quantified using a micron rating.  However, in some instances a mesh size is specified.

The chart below provides a nominal correlation between the US customary mesh sizes and the micron rating.

MeshinmmMicrons
No. 4000.00150.03737
No. 3250.00170.04444
No. 2700.00210.05353
No. 2300.00250.06363
No. 2000.00290.07474
No. 1700.00350.08888
No. 1400.00410.105105
No. 1200.00490.125105
No. 1000.00590.149149
No. 800.0070.177177
No. 700.00830.21210
No. 600.00980.25250
No. 500.01170.297297
No. 450.01390.354354
No. 400.01650.42420
No. 350.01970.5500
No. 300.02340.595595
No. 250.02780.707707
No. 200.03310.841841
No. 180.039411000
No. 160.04691.191190
No. 140.05551.411410
No. 120.06611.681680
No. 100.075722000
No. 80.09372.382380
No. 70.1112.832830
No. 60.1323.363360
No. 50.15744000
No. 40.1874.764760
No. 3 1/20.2235.665660
1/4 in.0.256.356350
0.265 in.0.2656.736730
5/16 in.0.31288000
3/8 in.0.3759.519510
7/16 in.0.43811.211200
1/2 in.0.512.712700

If you don’t find the information that you’re looking for above, please use the form below to contact us with specific details about the filtration screen or fabric that you are working with so that we can provide additional guidance.

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Contact Filter Products Company for filter bags customized to your precise needs and specifications. We will respond within 24 hours.