ISO INTERNATIONAL STANDARD 8361-1 First edition 1991-09-01 Thermoplastics pipes and fittings --- Water absorption Part 1: General test method Tubes et raccords en matieres thermoplastiques -- Absorption d'eau -- Partie 1: Methode generale d'essai Reference number ISO 8361-1:1991(E) IHS under li e with ISO No reproductio Not for Resale d without license from IHS ISO 8361-1:1991(E) Foreword Iso (the International Organization for Standardization) is a woridwide 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- mental and non-governmental, in liaison with iso, also take part in the work. Iso collaborates. closely with the International 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 fnter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 8361-1 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 general 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 acrylonitrilelbutadienelstyrene (ABs) pipes and fittings NOTE - Pipes and fittings made of other materials, i.e. chiorinated poyly(vinyl chioride) (PVC-C), high-impact poty(vinyl chloride) (PVC-Hl), 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. C ISO 1991 All rights reserved. No part of this publication may be reproduced or utillzed in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permisslon in writing from the pubilsher. International Organization for Standardization Case Postale 56*CH-1211 Geneve 20* Switzerland Printed in Switzerland i censefromIHS Not for Resale ISO 8361-1:1991(E) INTERNATIONAL STANDARD Thermoplastics pipes and fittings --- Water absorption Part 1: General test method The conditioned test pieces are then immersed for Scope 24 h in distilled water at a specified temperature (which depends on the material from which the pipe This part of IsO 8361 specifies a general test method or fitting is made). for determining the water absorption of thermo- plastics pipes and fittings. The mass of each test piece is determined again, and the change in mass per unit area calculated. Normative references 4 Immersion ffuids The following standards contain provisions which through reference in this text, constitute provisions of this part of IsO 8361. At the time of publication, 4.1 Distilled water, at a temperature of 23 'C the editions indicated were valid. All standards are ± 2 °℃. subject to revision, and parties to agreements based on this part of IsO 836i are encouraged to investi- 4.2 Distilled water (hot), at a temperature specific gate the possibility of applying the most recent edi- to the type gf pipe or fitting under test (see tions of the standards indicated below.Members of ISO 8361-2 and ISO 8361-3)1). IEC and IsO maintain registers of currently valid In- ternational Standards. 4.3 Acetic acid, between 98 % (m/m) 100 % (m/m) and at a temperature of 23 oc ± 2 °C. IsO 3126:1974, Plastics pipes -- Measurement of di- mensions. 5 Apparatus IsO8361-2:1991.Thermoplasticspipesandfittings Water absorption conditions for Part 2: Test unplasticized poly(vinyl chloride) (Pvc-U) pipes and Balance, accurate to 0,1 mg. fittings. 5.2 Des