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 de vinyle) non plastifie (Pvc-U) Reference number iSO8361-2:1991(E) Not for Resale ISO 8361-2:1991(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mentat and non-governmental, in liaison with isO, also take part in the work. Iso collaborates closely with the Internatlonal Electrotechnical 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 casting a vote. International Standard Iso 8361-2 was prepared by Technical Committee Iso/TC 138, Plastics pipes, fittings and valves for the transport of fluids. Iso 8361 consists of the following. parts, under the generat title Thermoplastics pipes and fittings -- Water absorption: -- Part 1: General test method Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings Part 3: Test conditions for acrylonitrilelbutadiene/styrene (ABS) pipes and fittings NOTE - Pipes and fittings made of other materials, i.e. chlorinated poyly(vinyl chioride) (PVC-C), high-impact poly(vinyl chloride) (PVC-Hi), and acrylonitrile/styrene/acrylate (AsA), will be dealt with later in addi- tional parts. Annex A of this part of Iso 8361 is for information only. iso 1991 All rights reserved. No part of thls publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permisslon In writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland cense from IHS Not for Resale 1SO 8361-2:1991(E) INTERNATIONAL STANDARD Thermoplastics pipes and fittings -- Water absorption - Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings Scope 3 Principle This part of Iso 8361 specifies the test conditions for Test pieces are first conditioned and their mass and determining the water absorption of unplasticized total surface area determined. pofy(vinyl chloride) (PVC-U) pipes and fittings. The conditioned test pieces are then immersed for 24 h in boiling distilled water. NOTE 1 The general test method for the determination of the water absorption of thermoplastics pipes and fit- The mass of each test piece is determined again tings is given in IsO 8361-1. and the change in mass per unit area calculated. This part of 1so 8361 also gives, for information purposes, the preferred maximum value of the water Procedure 4 absorption. The water absorption values appropriate for the in- 4.1 Measure the dimensions of the test pieces in tended applications of particular PvC-U pipes and accordance with 7.1 of IsO 8361-1:1991. fittings are specified in the relevant product stan- dards. 4.2 Calculate the total area A of each of the test pieces in accordance with 7.1 of IsO 8361-1:1991. 4.3 Immerse the test pieces (see clause 6 of Normative references Iso 8361-1:1991) for 1 min in the acetic acid (4.3 in ISO 8361-1:1991) at 23 °C ± 2 C, and then immerse The following standards contain provisions which, them in distiled water (4.1 in ISO 8361-1:1991) at through reference in this text, constitute provisions 23 ℃ ± 2 °℃ for 1 h. of t