ISO INTERNATIONAL STANDARD 3310-3 First edition 1990-07-15 Test sieves -- Technical requirements and testing -- Part 3: Test sieves of electroformed sheets Tamis de controle -- Exigences techniques et verifications Partie 3: Tamis de controle en feuilles électroformees Reference number ISO 3310-3:1990(E) ISO 3310-3:1990(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. International Standard iso 3310-3 was prepared by Technical Committee Iso/Tc 24, Sieves, sieving and other sizing methods. Iso 3310 consists of the following parts, under the general title Test sieves -- Technical requirements and testing : Part 1: Test sieves of metal wire cloth Part 2: Test sieves of perforated metal plate Part 3: Test sieves of electroformed sheets AnnexAofthispartofisO3310isforinformationonly 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 Organization for Standardization Case Postale 56: CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii ISO3310-3:1990(E) Introduction Since the accuracy of test sieving depends on the dimensional accuracy of the test sieve openings, the consistency of size within very close tol- erances that can be achieved for the openings of electroformed sheet makes them attractive for test sieving of very fine particulate material. Test sieves of electroformed sheet must be handled with particular care as the very fine apertures are invisible to the unaided eye. Notes on cleaning these sieves before and after use are given in annex A. ii