ISO INTERNATIONAL 1432 STANDARD Fifth edition 2021-03 Rubber, vulcanized or thermoplastic - Determination of low-temperature stiffening (Gehman test) CaoutchoucvulcaniséouthermoplastiqueDéterminationde la rigidite a basse température (Essai Gehman) Referencenumber IS0 1432:2021(E) ISO @ISO2021 IS0 1432:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 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 Email: [email protected] Website: www.iso.org Published in Switzerland i IS0 2021-All rights reserved IS01432:2021(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references ..1 3 Terms and definitions 4 Principle. ..1 5 Apparatus. .1 6 Calibration .3 7 Test piece. .3 7.1 Preparation of test piece. .3 7.2 Conditioning oftest piece .4 8 Procedure. .4 8.1 Mounting oftestpiece 4 8.2 Stiffnessmeasurements in liquidmedia .4 8.3 Stiffness measurements in gaseous media .5 8.3.1 General. 5 Measurements .5 8.3.2 8.4 Crystallization .5 .5 9 Number oftests. 10 Expression ofresults. .5 10.1 Torsional modulus .5 10.2 Relative modulus. .6 10.3 Apparent torsional modulus of rigidity 11 Precision ..8 12 Test report Annex A (normative) Calibration schedule .10 AnnexB (informative)Precision. ..13 Bibliography ..16 @ IS0 2021 - All rights reserved iii