ISO INTERNATIONAL STANDARD 48-4 First edition 2018-08 Rubber, vulcanized or thermoplastic Determination of hardness Part 4: Indentation hardness by durometer method (Shore hardness) Caoutchouc vulcanisé ou thermoplastique - Détermination de la dureté Partie 4: Dureté par pénetration par la méthode au durometre (dureté Shore) Reference number IS0 48-4:2018(E) ISO @ IS0 2018 Provided by IHS Markit under license with ANS IS0 48-4:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 40i: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved Provided by IHS Markit under iense withANS IS0 48-4:2018(E) Contents Page Foreword iv Introduction 1 Scope. 1 2 Normative references. .1 3 Terms and definitions. 4 Principle 5 Choice of durometer. 6 Apparatus. 2 6.1 Durometer types A, D and AO 6.1.1 Pressure foot 6.1.2 Indentor 6.1.3 Indicating device. 6.1.4 Calibrated spring . 6.1.5 Automatic timing device (optional) 6.2 Durometer type AM.. 6.2.1 Pressure foot 6.2.2 Indentor 6.2.3 Indicating device. 6.2.4 Calibrated spring. 6.2.5 Automatic timing device (optional) 6 6.3 Stand.. 6.4 Durometer spring force calibration 6 7 Test pieces 7.1 General.. 7.2 Thicknes .. 7.3 Surface 8 Conditioning and test temperature. 8 9 Procedure 8 9.1 General. 9.2 Test time. 8 9.3 Measurements. 8 10 Calibration and checking. 8 10.1 Calibration.. 10.2 Checking using standard rubber blocks 9 11 Precision 12 Test report Annex A (informative) Precision. 10 Bibliography 15 @IS0 2018 - All rights reserved iii Provided by IHS Markit under license with ANSI