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ISO 565:1990
Test sieves -- Metal wire cloth, perforated metal plate and electroformed sheet -- Nominal sizes of openings
Applies to metal wire cloth with square openings and perforated plates or sheets with square or circular openings. Tables include principal sizes and supplementary sizes. Sizes of 1 mm and above shall be expressed in millimetres and sizes below 1 mm in micrometres.
International Organization for Standardization [iso]