ISO INTERNATIONAL STANDARD 4433-2 First edition 1997-12-15 Thermoplastics pipes Resistance to liquid chemicals- Classification- Part 2: Polyolefin pipes Tubes en matieres thermoplastiques-Résistance aux liquides chimiques-Classification- Partie2:Tubesenpolyolefines This material is reproduced from Iso documents under International Organization for Standardization (IsO) Copyright License number IHS/IcC/1996.Not for resale.No part of these isO documents may be reproduced inanyform,electronic retrievalsystem orotherwise,exceptas allowed in the copyright law of the country of use, or with the prior written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 7341079),IHsortheIsoLicensor'smembers. ISO Referencenumber ISO4433-2:1997(E) ISO4433-2:1997(E) Foreword Iso (the International Organization for Standardization) is a worldwide preparing International Standards is normally carried out through Iso technical committees.Each member body interested in a subjectfor which on that committee. International organizations, governmental and non- governmental, in liaison withiso, also take part in thework. .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 ISO 4433-2 was prepared by Technical Committee ISO/TC138,Plastics pipes,fittings and valvesforthetransport of fluids, Subcommittee SC 3, Plastics pipes and fitings for industrialapplications. andreplacesISO4433:1984,whichhasbeentechnicallyrevised. isO 4433 consists of the following parts, under the general title Thermo- plasticspipesResistancetochemicalfluids-Classification: Part 1: Immersion test method Part2:Polyolefinpipes Part3:Unplasticized poly(vinylchloride)(PVC-U)， high-impact (PVC-C) pipes Part 4:Poly(vinylidene fluoride) (PVDF)pipes AnnexAof this part of ISO4433 is for information only. @ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfitm, without permission in writing from the publisher. Intermational Organization for Standardization Case postale 56:CH-1211Geneve 20·Switzerland Intemet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; s=contral Printed in Switzerland ii @ISO ISO4433-2:1997(E) Introduction chemical resistanceofpolyolefinpipes. properties resulting from immersion of test pieces, taken from the walls of polyolefin 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 underpressure,themethod onlyallows incompatibilitiesbetweentheliquid and the material to be detected; a "satisfactory" or"limited" result needs to be confirmed by subsequent tests using ISO 8584-1[1] (see annex A). NOTES 1 if pertinent to the proposed application,consideration should be given to whetherparticularliquidspermeatethepipewall. 2 The possibility of a build-up of electrostatic charge in pipes during use should also be considered. ili