ISO INTERNATIONAL STANDARD 502 Third edition 2015-06-15 Coal Determination of caking power Gray-King coke test Charbon - Deétermination du pouvoir agglutinant Essai Gray-King Reference number IS0502:2015(E) SO International Organization for Standardization Zhejang Institute of Standardization 5956617 IS02015 vided by IHS underI itted without license from IHS IS0 502:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org PrganizationforStandardization Not for Resale, 2015/9/22 08:04:21 etworking permitted without license from IHS IS0 502:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Principle 4 Reagent. ..1 4.1 Standard electrode carbon (see 10.1) ..1 5 Apparatus .2 6 Preparation of sample ..2 7 Procedure. 7.1 Coals with a Gray-King coke type within the range A to G2 (see 10.3) 7.2 Coals with a Gray-King coke type greater than G2 (see 10.3) .3 8 Expression ofresults ..3 9 Precision ofthemethod 9.1 General ..3 9.2 Repeatability ..4 9.3 Reproducibility ..4 10 Notes on procedure ..4 11 Test report ..5 Annex A (normative) Determination of the bulk density of electrode carbon ..11 iii vided by IHS under I thout license from IHS