A measure of retention, expressed in microns, that specifies the equivalent diameter of the smallest particle from which the filter has retention of 100%. In actual practice, most manufacturers assign absolute ratings on the basis of retention in the range from 98% - 99.999999%.
Bolting Cloth – A thin, strong, flexible precisely woven group of meshes which are used for sieving and sifting powders.
Coarse Stainless Steel Mesh - Openings that range from about the size of a pencil lead (1/16 inch) and downward to the size of a medium human hair (1/125 inch).
Fine Stainless Steel Mesh - Group of stainless steel wire cloth mesh has openings that range from about the size of a medium human hair (200 microns) and downward to the size of a large bacteria (2 microns).