ISO INTERNATIONAL STANDARD 7231 Third edition 2023-08 Polymeric materials, cellular, flexible Determination of air flow value at constant pressure-drop Matériaux polymeres alveolaires souples - Détermination de I'indice d'écoulement d'air a chute de pression constante Reference number IS0 7231:2023(E) osi @IS02023 IS0 7231:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on or ISo's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2023 - All rights reserved