Mesh (scale) - Sieve Sizing and Conversion Charts | Sieve ...
Further information on equivalent mesh sizes from 5μm to 25.4mm is available. Available sieve sizes are usually regulated by standards. Those in common use are ISO 565:1990 and ISO 3310-1:2000 (international), EN 933-1 (European) and ASTM E11:01 (US). EN standards are available with national 'badging' so appear as BS EN, FR EN, DE EN, etc.