ISO INTERNATIONAL STANDARD 14887 First edition 2000-09-01 Sample preparation Dispersing procedures for powders in liquids Préparation de I'échantillon - Procédures pour la dispersion des poudres danslesliquides Reference number ISO 14887:2000(E) ISO @ ISO 2000 ISO 14887:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobeis atrademarkof AdobeSystems Incorporated Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by isO member bodies. In the unlikely event ?ISO2000 All rights reserved. Unless otherwise specified, 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 either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland ii @ IsO 2000 - All rights reserved ISO 14887:2000(E) Contents Page Foreword. iv Introduction 1 Scope 2 Normative reference. 3 Terms and definitions 4 Symbolsandabbreviatedterms 5 Examination of the dry powder 6 Selection of a liquid and trial dispersion . 7 Examination of the dispersion 8 Identification of possible dispersing agents . 6 6 Optimization of the dispersion method. 12 10 Maintenance of dispersion stability during sample handling. Annex A (informative) Alternative dispersion-stability tests. Annex B (informative) Commercial dispersing agents in the various dispersing agent categories.. Bibliography Iso 2000-All rights reserved ili ISO 14887:2000(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights International Standard ISO 14887 was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods, Subcommittee SC 4, Sizing by methods other than sieving. Annexes A and B of this International Standard are for information only iv @ IO 2000 - All rights reserved ISO 14887:2000(E) Introduction process control, quality control, and other technical activities where particle size effects are important. Paints, inks, analysis for their commercial production. A typical powder is composed of clumps of “primary" particles that are held together by weak or strong forces. The size of clumps remaining after the powder has been wetted into a liquid depends in part on how much energy has distribution to larger sizes than if all the clumps were broken up. A particle size analysis is useful only if the sample is prepared so that the particles are in a well-defined degree of dispersion, preferably one in which most clumps are container during the time required for analysis. powder into a liquid using a low-shear process that does not break moderately