ISO INTERNATIONAL STANDARD 8639 Third edition 2023-04 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural design of flexible joints Tubes et raccords en plastiques thermodurcissables renforcés de verre (PRV) - Méthodes d'essai pour I'étanchéité et preuve de conception structurelle de joint flexible Reference number IS0 8639:2023(E) ISO @ ISO 2023 IS0 8639:2023(E) COPYRIGHTPROTECTED DOCUMENT @IS02023 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 or ISoO'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:copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2023- All rights reserved