ISO INTERNATIONAL STANDARD 8361-2 First edition 1991-09-01 Thermoplastics pipes and fittings -- Water absorption Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings Tubes et raccords en matieres thermoplastiques --Absorption d'eau Partie 2: Conditions particulieres d'essai pour tubes et raccords en poly(chlorure devinyle)nonplastifie (Pvc-U) Reference number ISO 8361-2:1991(E) ISO 8361-2:1991(E) Foreword Iso(the International Organization for Standardization)isa worldwide federation ofnational standardsbodies (iso memberbodies).Thework of preparing International Standards is normally carried out through Iso technicalcommittees.Eachmemberbodyinterestedinasubjectfor which atechnical committee has been established has the righttobe represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso,alsotake part in the work.IsocollaboratescloselywiththeInternationalElectrotechnical Commission (IEC)on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an Inter- bodies castingavote. International Standard Iso8361-2waspreparedbyTechnical Committee Iso/TC138,Plasticspipes,fittingsandvalvesforthetransportoffluids. Iso 8361 consists of the following parts,underthegeneral title Thermoplasticspipesandfittings--Waterabsorption: Part1:Generaltestmethod Part2:Testconditions for unplasticizedpoly(vinyl chloride) (PvC-U)pipes andfittings Part3:Test conditions foracrylonitrile/butadiene/styrene (ABS) pipes andfittings NOTE E-Pipesand fittings made of othermaterials,i.e.chlorinated poyly(vinyl chloride) (PVC-C), high-impact poly(vinyl chloride) (PVC-Hi), and acryionitrile/styrene/acrylate (AsA), will be dealt with later in addi- tional parts. AnnexAofthispartofiso8361isforinformationonly. ?ISO1991 All rights reserved.No part of this publication may be reproduced or utiized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO 8361-2:1991(E) INTERNATIONALSTANDARD Thermoplastics pipes and fittings -- Water absorption Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings Scope 3Principle 1 ThispartofIso8361specifiesthetestconditionsfor Test pieces are first conditioned and their mass and determiningthewaterabsorptionofunplasticized total surface area determined. poly(vinyl chloride) (PVC-U) pipes and fittings. Theconditionedtestpiecesarethenimmersedfor 24 h in boiling distilled water. NOTE1 Thegeneraltestmethodforthedetermination of thewater absorption of thermoplastics pipes and fit- The mass of each test piece is determined again tingsisgiveninIsO8361-1. and the change in mass per unit area calculated. This part of iso 8361 also gives,for information purposes,thepreferredmaximumvalueofthewater 4 Procedure absorption. The water absorption values appropriate for the in- 4.1Measure the dimensions of the test pieces in tended applications of particular PvC-U pipes and accordancewith7.1of1so8361-1:1991. fittings are specified in the relevant product stan- dards. 4.2Calculate the total area A of each of the test piecesinaccordancewith7.1ofisO8361-1:1991. 4.3Immersethetestpieces(seeclause6of 2 Normative references ISo8361-1:1991)for1min intheaceticacid(4.3in ISo8361-1:1991)at23°C±2°C,andthenimmerse The following standards contain provisions which, them in distilledwater(4.1 inISO8361-1:1991)at through reference in this text, constitute provisions 23°C±2°Cfor1h. of this part of Iso 8361.At the time of publication, theeditions indicatedwerevalid.All standardsare 4.4Removethetestpiecesfromthedistilledwater subjectto revision,and partiesto agreementsbased and wipethem with filter paper.Place them in the onthispartof iso8361are encouragedtoinvesti- desiccator(5.2inIso 8361-1:1991)andleavefor2h gate the possibility of app