ISO INTERNATIONAL STANDARD 20754 First edition 2018-04 Textiles Man-made fibres Determination of shape factors in cross section Textiles -Fibres fabriquees Détermination des facteurs de forme danslasection Reference number IS0 20754:2018(E) ISO Copyright International Organization for Standardization @IS02018 IS0 20754:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 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 below or Iso's member body in the country of the requester. ISO copyright office CP401·Ch.deBlandonnet8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland Copyightilerational Organizationfor Standardization @ IS0 2018 - All rights reserved IS0 20754:2018(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Principle 5 .2 Apparatus 6 Testing conditions and specimen .2 6.1 Testing conditions. 2 6.2 Sampling.. .3 6.3 Preparation of the test specimen 3 6.3.1 Microtome method. .3 6.3.2 Platemethod .3 7 Testing procedure .3 7.1 Calibration of indicating value. .3 7.2 Image capture of fibre cross-section 3 7.3 Number of tests. .4 7.4 Shape factor in radius 4 7.5 Shape factor in cross-section ..4 7.6 Coefficient of perimeter .5 7.7 Degree of hollowness .5 7.8 Coefficient of perimeters of hollowness .6 7.9 Specific factors. .7 7.9.1 Length of contour line 7.9.2 Arc radius .7 7.9.3 Angle. 7.9.4 Distance between two lines ..8 8 Result. ..8 6 Test report .9 Annex A (normative) Number of additional tests .10 CopyightIntermatinal OrgSraizA rights reserved iii