ISO INTERNATIONAL STANDARD 5636-4 Third edition 2013-11-01 Paper and board Determination of air permeance (medium range) - Part 4: Sheffield method Papier et carton - Détermination de la perméance a I'air (valeur moyenne)- Partie 4: Méthode Sheffield Reference number IS0 5636-4:2013(E) ISO @IS02013 Not for Resale IS0 5636-4:2013(E) COPYRIGHTPROTECTED DOCUMENT @ISO2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved Not for Resale IS0 5636-4:2013(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Principle 5 Apparatus. ..2 6 Sampling. 7 Conditioning ..3 8 Preparation of test pieces ..3 9 Calibration .4 9.1 Variable-area flow-measuring device ..4 9.2 Electronic flow-measuring device .4 10 Procedure .4 11 Expression of results 4 11.1 Calculationofairpermeance .4 11.2 Reporting the results .5 11.3 Standard deviation and coefficient of variation ..5 12 Test report ..5 AnnexA(normative)Calibrationofflowmeters ..6 Annex B (informative) Conversion of Sheffield units (SU) to SI units ..10 Annex C (informative) Precision data ..11 Bibliography ..13 ii thout license from IHS Not for Resale