ISO INTERNATIONAL STANDARD 4433-4 First edition 1997-12-15 Thermoplastics pipes Resistance to liquid chemicals Classification - Part 4: Poly(vinylidene fluoride) (PVDF) pipes Tubes en matieres thermoplastiques - Résistance aux liquides chimiques Classification - Partie 4: Tubes en poly(fluorure de vinylidene) (PVDF) Tso Referencenumber ISO 4433-4:1997(E) ISO 4433-4:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federationofnationalstandardsbodies(lsOmemberbodies).Theworkof preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which atechnicalcommitteehasbeenestablishedhastherighttoberepresented on that committee. International organizations, governmental and non- governmental, in liaison with SO, also take part in the work. iSO collaborates closely with the International Electrotechnical Commission (lEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard SO 4433-4 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee Sc 3, Plastics pipes and fittings for industrial applications. and replaces ISO 4433:1984, which has been technically revised. IsO 4433 consists of the following parts, under the general title Thermo- plastics pipes-Resistance to chemical fluids-Classification: Part 1: Immersion test method Part 2: Polyolefin pipes Part 3: Unplasticized poly(vinyl chloride)(PvC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C)pipes Part 4: Poly(vinylidene fluoride) (PVDF) pipes Annex A of this part of ISO 4433 is for information only. @ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56.CH-1211 Geneve 20· Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; =isocs; s=central Printed in Switzerland ii @ ISO ISO 4433-4:1997(E) Introduction chemical resistance of PVDF pipes. The method is based on the change in mass and changes in tensile properties resulting from immersion of test specimens taken from the walls of PvDF pipes in the liquid to be conveyed, in the absence of pressure If the pipes are to be used under stress, for example for conveying liquids under pressure, the method only allows incompatibilities between the liquid to be confirmed by subsequent tests using IsO 8584-1[1] and ISO/TR 8584-2[2] (see annex A). NOTES 1 If pertinent to the proposed application, consideration should be given to whether particular liquids permeate the pipe wall. 2 The possibility of a build-up of electrostatic charge in pipes during use should also be considered. ili