ISO INTERNATIONAL STANDARD 9865 First edition 1991-12-15 Corrected and reprinted 1992-04-15 Textiles -- Determination of water repellency of fabrics by the Bundesmann rain-shower test Textiles -Hydrophobicite de tissus a I'aide d'un essai d'arrosage suivantlamethodeBundesmann Reference number ISO9865:1991(E) ISO 9865:1991(E) Foreword iso (the International Organization for Standardization) is a worldwide federation of nationai 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.so 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- national Standard requires approval by at least 75% of the member bodies castinga vote. International Standard is0 9865 was prepared by Technical Committee ISO/TC38,Textiles. @ isO 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfim, without permission inwritingfromthepublisher. International Organization for Standardization Case Postale 56.CH-1211Geneve 20·Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD ISO 9865:1991(E) Textiles --- Determination of water repellency of fabrics by the Bundesmann rain-shower test Principle Scope 1 4 This International Standard describes a method for Test specimens of textile fabrics are mounted on thedeterminationofthewaterrepellencyoftextile fabrics by a rain-shower the under defined conditions. The water repellency is testknown as assessed by visual comparison of the wet speci- Bundesmann method. mens with reference photographs. The water ab- The test may be used to assess the effectiveness of finishing procedures for rendering textile fabrics The water penetrating the specimens is also col- water-repellent. lected in the cups and recorded. Apparatus and materials 5 2 Normative reference NOTE 1 The rain shower equipment produces an arti- The following standard contains provisions which, ficial rain shower defined by water flow, drop size and through reference in this text, constitute provisions drop fall height. The rain shower equipment may have one ofthisInternationalStandard.Atthetime ofpubli- or more devices for hoiding the specimens. To remove cation, the edition indicated was valid. All standards excess water from the specimens, a centrifuge for hori- are subject to revision, and parties to agreements zontal rotation at a specific speed is used. based on this International Standard are encour- aged to investigate the possibility of applying the 5.1 Rain shower equipment,1" comprising a system most recent edition of the standard indicated below. of 300 identical drop-forming devices, e.g. nozzles Members of IEC and Iso maintain registers of cur- or jets, equally distributed over a circular horizontal rently valid International Standards. surface (area ~ 1 300 cm2) of 406 mm diameter. IsO 139:1973,Textiles - Standard atmospheres for The approximate diameter of the drop produced by conditioning and testing. each drop former is 4 mm. Water emerging from the drop former produces a drop of approximately 0,o7 ml. The water flow of the rain shower equip- ment can be varied so that the time-related flow of 3 Definition prescribed for the test beset water can t to (100 ± 5) ml/min for a rain shower surface area of For the purposes of this International Standard, the 100 cm2. The drop fall height, i.e. the vertical dis- following definitionapplies. tance between the drop former and