ISO INTERNATIONAL STANDARD 20274 First edition 2017-07 Vitreous and porcelain enamels Preparation of samples and determination of thermal expansion coefficient Emaux vitrifiés - Preparation d'échantillons d'émail et détermination du coefficient de dilatation thermique Reference number IS0 20274:2017(E) International Organization for Standardization @ IS0 2017 e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 mitted without license from IHS IS0 20274:2017(E) COPYRIGHT PROTECTED DOCUMENT IS0 2017, 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 copyright office 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 Licensee-ZHEJIANG INST OF STANDARDIzRoISQ 7 - All rights reserved networking permited without license from IHS IS0 20274:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Apparatus ..1 5 Requirements for the test specimen ..1 6 Preparation of the test specimens ..2 6.1 General .2 6.2 Production by casting. .2 6.3 Production by drawing out of the melt .2 6.4 Production by sintering. ..3 7 Determination of the thermal expansion coefficient ..3 8 Calculation and indication of the results ..4 9 Testreport ..4 Annex A (informative) Metallic casting mould ..5 Annex B (informative) Drawing from the melt .6 Inteainal oganzation @stSr207 - All rights reserved iii nsee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS