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 Referencenumber ISO 8361-1:1991(E) 1SO 8361-1:1991(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 so 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 Inter- bodies casting a vote. International Standard Iso8361-1waspreparedbyTechnicalCommittee Iso/Tc138,Plastics pipes,fittingsandvaives forthetransportoffluids. iso 8361 consists of the followingparts,under the general title Thermoplasticspipes andfittings -Water absorption: Part 1:General test method Part 2:Test conditions for unplasticized poly(vinyl chloride) (PVC-U)pipes and fittings Part3:Test conditions for acrylonitrile/butadiene/styrene (ABS) pipes andfittings NOTE E-Pipes and fittings made of other materials,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. AnnexAof thispartof iso8361 is for information only. ISO1991 or byanymeans,electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. International OrganizationforStandardization CasePostale56.CH-1211Geneve20·Switzerland Printed in Switzerland ii INTERNATIONALSTANDARD ISO 8361-1:1991(E) Thermoplastics pipes and fittings --- Water absorption : Part 1: General test method Scope The conditioned test pieces are then.immersed for 1 24 h in distilled water at a specified temperature This partofiso 8361specifies a general testmethod (which depends on the material from which the pipe for determining the water absorption of thermo- or fitting is made). plastics pipes and fittings. The mass of each test piece is determined again, and the change in mass per unit area calculated. 2 Normative references 4 Immersion fluids The following standards contain provisions which throughreferenceinthistext,constituteprovisions of this part of Iso 8361.At the time of publication, 4.1 Distilled water, at a temperature of 23C the editions indicated were valid. All standards are ± 2 °℃. subjecttorevision,andpartiesto 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 of pipe or fitting under test (see tionsofthestandards indicatedbelow.Members of ISo 8361-2 and IsO 8361-3)"), IEC andiSOmaintainregisters ofcurrentlyvalid In- ternational Standards. 4.3 Acetic acid, between 98 % (m/m) and Iso3126:1974,Plasticspipes-Measurementofdi- 100 % (m/m) and at a temperature of 23 °C ± 2 °C. mensions. Iso8361-2:1991,Thermoplasticspipesandfittings 5 Apparatus Water absorption Part 2: Test conditionsfor unplasticized poly(vinyl chloride) (PvC-U)pipes and 5.1Balance,accurateto0,1mg fittings. Iso8361-3:1991,Thermoplasticspipesandfittings- 5.2 Desiccator, containing silica gel. Water absorption Part 3:Test conditions for acrylonitrile/butadiene/styrene (ABS)pipes and fit- 5.3 Thermostatic baths, capable of maintaining the tings. distilled water (4.1 and 4.2)at respective tempera- tures of 23°C ± 2 °C and the temperature specific to the type of pi