ISO INTERNATIONAL STANDARD 1136 Secondedition 2015-03-01 Wool Determination of mean diameter of fibres Air permeability method LaineDéterminationdudiametremoyendesfibres-Methode perméamétrique Reference number ISO1136:2015(E) ISO Intermational Organization for Standardization @IS02015 No reproduction or itted without license from IHS IS0 1136:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2015 All rights reserved. Unless otherwise specified, 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 the internet or an intranet, without prior 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. + 4122 749 0111 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland PrganizationforStandardization No reproduction or networking permitted without license from IHS Not for Resale, 2015/6/2 07:03:3 IS0 1136:2015(E) Contents Page Foreword ..iv Introduction.. 1 Scope.. 2 Normativereferences 3 Terms and definitions ..1 4 Principle ..1 5 Apparatus. .2 5.1 Forms of apparatus .2 5.2 Detailed parts. ..2 6 Conditioningand testing atmosphere .4 7 Preparation of test specimens ..4 7.1 Unopenedsliver .4 7.1.1 Cleaning 4 7.1.2 Number of specimens 4 7.1.3 Selection of specimens .5 7.1.4 Specimen mass 5 7.1.5 Preparation .5 7.2 Openedsliver 5 7.2.1 Cleaning .5 7.2.2 Preparation .5 7.2.3 Number of specimens. .5 7.2.4 Selection ofspecimens .5 7.2.5 Specimen mass .5 8 Procedure. .6 8.1 Unopened sliver ..6 8.2 Openedsliver .6 9 Expression of results .1 10 Test report .7 AnnexA(informative)Calibrationofapparatus ..8 AnnexB (informative)Reproducibilityofresults .11 AnnexC (normative)Correctionforrelativehumidity ..12 AnnexD (informative)Specialtypesofwool ..13 AnnexE(informative)Referencesliversforcalibration ..14 Bibliography .15 iii vithoutlicense from IHS