ISO INTERNATIONAL STANDARD 2591-1 First edition 1988-12-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ISo ORGANISATION INTERNATIONALE DE NORMALISATION ME)KAYHAPOAHAA OPTAHW3ALMR nO CTAHAAPTИ3ALWИ Test sieving Part 1 : Methodsusingtestsievesofwovenwireclothand perforatedmetalplate Tamisagedecontrole Partie 1:Modes operatoires utilisant des tamis de controle en tissus metalliques et en toles metalliquesperforées Reference number ISO 2591-1 : 1988 (E) ISO2591-1:1988 (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 withtheInternational Electrotechnical Commission(lEC)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 least 75 % approval by the member bodies voting. International StandardISO2591-1was prepared by Technical 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 forStandardization,1988 Printed in Switzerland INTERNATIONALSTANDARD ISO2591-1:1988 (E) Test sieving Part 1 : Methods s using test sieves of woven wire cloth and perforatedmetalplate 0 Introduction 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 0.2 Principles 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- 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 thefact that a specific particle with a size close to that of the sieves arestandardized inISO3310. apertures only when presented in a favourable position, and ISo2591 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. oversize apertures is limited by the specifications for test sieves.The procedure is also complicated inmany cases by the The procedures given depend on the predominant size range of the particles in a sample, and it is recognized in this part of cause blinding of the sieve apertures and reduce the effective ISo 259