ISO INTERNATIONAL STANDARD 9237 First edition 1995-06-15 Textiles -- Determination of the permeability of fabrics to air Textiles - Détermination de la perméabilité a I'air des étoffes ISO Reference number ISO9237:1995(E) for Standardizatior Not for Resale ISO 9237:1995(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 which a technical committee has been established has the right to be represented on that committee. International organizations, governmental 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. circulated to the member bodies for voting. Publication as an International a vote. International Standard ISO 9237 was prepared by Technical Committee ISO/TC 38, Textiles. Annexes A and B of this International Standard are for information only. ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland No reproduction or networking permitted without license from IHS Not for Resale ISO 9237:1995(E) INTERNATIONAL STANDARDISO Textiles - Determination of the permeability of fabrics to air 1 Scope 4 Principle This International Standard describes a method for The rate of flow of air passing perpendicularly through measuring the permeability of fabrics to air and is ap- a given area of fabric is measured at a given pressure plicable to most types of fabrics, including industrial difference across the fabric test area over a given fabrics for technical purposes, nonwovens and time period. made-up textile articles that are permeable to air. 5 Sampling Normative references Select samples either in accordance with the pro- cedure laid down in the material specification for the The following standards contain provisions which, fabric, or as agreed between the interested parties. through reference in this text, constitute provisions of this International Standard. At the time of publi- In the absence of specification, follow the example cation, the editions indicated were valid. All standards of sampling given in annex B. are subject to revision, and parties to agreements based on this International Standard are encouraged 6 Atmospheres for conditioning and to investigate the possibility of applying the most re- testing cent editions of the standards indicated below Members of IEC and ISO maintain registers of cur- The atmospheres for preconditioning, conditioning rently valid International Standards. and testing shall be as specified in ISO 139. IsO 48:1994, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 Apparatus IRHD and 100 IRHD). Metrological confirmation of the test apparatus shall ISO 139:1973, Textiles - Standard atmospheres for be carried out in accordance with ISO 10012-1. conditioning and testing. 7.1 Circular specimen holder, with an orifice al- Is010012-1:1992,Qualityassurancerequirements lowing the test to be carried out on an area of for measuring equipment - Part 1:Metrological 5 cm², 20 cm², 50 cm²or 100 cm². confirmation system for measuring equipment. The tolerance on the test area shall not exceed ± 0,5 %. 3Definition NOTE 1 Adequate support of the test specimen, particu For the purposes of this International Standard, the larly for large test surfaces, is recommended. following definition applies. 7.2 Means for clamping, to secure the specimen 3.1 air permeability: Velocity of an air flow passing without distortion. perpendicularly through a tes