PDF AP42, CH : Ceramic Products Manufacturing US EPA
( in., 325 mesh). Dry forcedair sieving and sonic sizing can be used to size dry powders down to 37 µm ( in., 400 mesh), and wet sieving can be used for particles down to 25 µm ( in., 500 mesh). Air classifiers generally are effective in the range of 420 µm to 37 µm EMISSION FACTORS 7/96