ISO INTERNATIONAL STANDARD 7685 Second edition 2019-07 Glass-reinforced thermosetting plastics (GRP) pipes Determination of initial ring stiffness Tubes en plastiques thermodurcissables renforcés de verre (PRV) - Détermination de la rigidité annulaire initiale Reference number IS0 7685:2019(E) osi @ IS0 2019 IS0 7685:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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 401 : 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 i @ IS0 2019 - All rights reserved