ISO INTERNATIONAL STANDARD 565 Third edition 1990-07-15 Test sieves -- Metal wire cloth, perforated metal plate and electroformed sheet -- Nominal sizes of openings Tamis de controle -- Tissus metalliques, toles metalliques perforees et feuilles électroformees -Dimensions nominales des ouvertures Reference number ISO 565:1990(E) CopyrightInemationalganizainfStandardizain No reroduction or networking permited ithoutlicense from IHs Not forResale,12/14/200522:39:14M ng, jiangang ISO 565:1990(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 voting. Publication as an Interna- tional Standard requires approval by at least 75 % of the member bodies casting a vote. Iso/Tc 24, Sieves, sieving and other sizing methods. Thisthird editioncancelsandreplacesthe second edition (Iso 565:1983), of which it constitutes a technical revision (see the In- troduction). Annex A of this International Standard is for information only. ISO1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization Case Postale 56.CH-1211Geneve 20·Switzerland PrintedinSwitzerland ii Copyrght Intermational Organization for Standardization n.TX/5919206101,User=wang.jangang nse from IHS ISO 565:1990(E) Introduction When test sieves of electroformed sheet were incorporated in the sec- of openings were extended down to 5μm by introducing the values of the R'10 series, in accordance with IsO 497, for all principal sizes from 32 μm and smaller. In the meantime it has been recognized that there is little call for some of the smaller sizes of openings in metal wire cloth and in electroformed sheet. It was agreed therefore to delete the supplementary sizes 28 μm and 22 μm and the principal sizes 12,5 μm, 8 μm and 6,3 μm from the tables of nominal sizes ofopenings. Apart from these omissions, the ratio of successive sizes in the series is as shown in table0.1. Table 0.1 Series ISo3 Step Ratio and Iso 497 R 20/3 about 40 % 1,40 R'10 about 25 % 1,25 R 40/3 about 19 % 1,19 R 20 about12% 1,12 This International Standard will be further revised if it becomes evident that one of the supplementary series given in table 1 and table 2, namely R 20 or R 40/3, has found sufficient general and worldwide recognition that it is no longer necessary to include both series. Requirements for test sieves, for example tolerances on sizes of openings and methods for verification, are given in Iso 3310-1, ISO 3310-2 and ISO 3310-3. ili Copyright Intermational Organization for Standardization n.TX/5919206101,User=wang. jangang vithout license from IHS