ISO INTERNATIONAL STANDARD 2591-1 First edition 1988-12-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION so ORGANISATION INTERNATIONALE DE NORMALISATION MEKAYHAPOAHAA OPIAHM3ALMH HO CTAHAAPTM3ALMM Test sieving Part 1 : Methods using test sieves of woven wire cloth and perforated metal plate Tarmisage de controle - Partie 1 : Modes operatoires utilisant des tamis de controle en tissus metalliques et en toles métalliques perforées Reference number ISO 2591-1 : 1988 (E) ed without license from IHS Not for Resale ISO 2591-1 : 1988 (E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (iso member bodies). The work of preparing International Standards is normally carried out through ISo technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at International Standard ISO 2591-1 was prepared byTechnical Committee ISO/TC 24 Sieves, sieving and other sizing methods. This edition of ISO 2591-1 cancels and replaces in part ISO 2591 : 1973, of which it constitutes a technical revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. ? International Organization for Standardization,1988 Printed in Switzerland Copyright International Organization for Standardization nsefrom IHS Not for Resale ISO 2591-1 : 1988 (E) INTERNATIONAL STANDARD Test sieving Part 1 : Methods using test sieves of woven wire cloth and perforated metal plate Introduction 0 simplified procedure with a given operator and particular ap- paratus in one set-up may be found adequate for control pur- poses, even though the reproducibility of the procedure as 0.1 General considerations used between different laboratories may not be very good. Test sieving is used in many industries on a wide variety of materials and for different purposes. No single method of test 0.2Principles of sieving sieving can be specified to cover the many applications, and certain industries have already produced specifications for siev- A single test sieve separates a particular material into two frac- ing procedures which are incorporated in the appropriate Inter- tions, of which one is retained by the sieving medium and the national Standard for a limited application. Standardized series other of which passes through its apertures. When applied to of nominal openings of test sieve media are specified in particles of non-spherical shape the procedure is complicated ISO 565, and standardized technical requirements on test by the fact that a specific particle with a size close to that of the sieves are standardized in IS0 3310. nominal aperture size of the test sieve may pass through the apertures only when presented in a favourable position, and ISo 2591 is intended as a guide to all who are responsible for will not pass through when presented in other positions. As deciding on test sieving procedures, including those concerned there is inevitably a variation in the size of the sieve apertures, with specific materials, and it formulates general principles of prolonged sieving will cause the larger apertures to exert an un- sieving which may be applied to many natural and artificial duly significant effect on the sieve analysis: the proportion of materials. sieves. The proc