Mesh and grit sizes are most often refered to by a number. This relates to the number of wires per inch - and in a subsidary fashion also to the size of the wire used to form the grid through which the material falls and so is sorted into various sizes. The table below gives some of these figures most useful for mould making - mesh number, percentage of open area, the wire diameters in mm, and the mesh opening or material size in mm.
No.12 ; % open 51.8 ; dia. 0.5842 ; size 1.5240
No.14 ; % open 51.0 ;dia. 0.5080 ; size 1.2954
No.20 ; % open 46.2 ; dia. 0.4064 ; size 0.8636
No.30 ; % open 37.1 ; dia. 0.3048 ; size 0.5156
No.40 ; % open 36.0 ; dia. 0.2286 ; size 0.3810
No.50 ; % open 30.3 ; dia. 0.1905 ; size 0.2794
No.60 ; % open 30.5 ; dia. 0.1397 ; size 0.2337
No.80 ; % open 31.4 ; dia. 0.1143 ; size 0.1778
No.100;% open 30.3 ; dia. 0.0940 ; size 0.1397
No.120; % open 30.7 ; dia. 0.0940 ; size 0.1168
No.200; % open 33.6 ; dia. 0.0533 ; size 0.0737
No.325;% open 30.0 ; dia. 0.0356 ; size 0.0432
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