ISO INTERNATIONAL STANDARD 2370 Third edition 2019-01 Textiles Determination of fineness of flax fibres Permeametric methods Textiles - Détermination de la finesse des fibres de lin - Méthodes perméamétriques Reference number ISO2370:2019(E) so @ IS0 2019 IS0 2370:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 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 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 2370:2019(E) Contents Page Foreword ..iv Introduction. ... 1 Scope 2 Normative references 3 Terms and definitions 4 Conditioning and test atmosphere ..2 5 Constant flow method .2 5.1 Principle. .2 5.2 Sampling. .2 5.3 Test pieces. .2 5.3.1 Reguirement 2 5.3.2 Preparation. 2 5.4 Apparatus .3 5.5 Procedure 4 5.5.1 Determination of output ..4 5.5.2 Measurement of resistance, R1 4 5.5.3 Measurement of resistance, R2 ..5 5.6 Control of apparatus functioning .6 5.7 Calculation and expression of results .6 6 Simplified constant flow method .7 6.1 Principle. .7 6.2 Sampling. .7 6.3 Test pieces. 6.3.1 Requirement ..8 6.3.2 Preparation 6.3.3 Determination of the mass of the test pieces ..8 6.4 Apparatus. ..8 6.5 Procedure. ..10 6.6 Control of apparatus functioning .11 6.7 Calculation and expression of results. ..11 7 Constant pressure method .11 7.1 Principle .11 7.2 Sampling. .11 7.3 Test pieces. .12 7.3.1 Requirement .12 7.3.2 Preparation ..12 7.3.3 Determination of the mass of the test pieces .12 7.4 Apparatus .12 7.5 Procedure .12 7.6 Control of apparatus functioning .13 7.7 Calculation and expression of results .13 8 Test report ..13 Annex A (normative) Carding of flax tow in wads. .14 Annex B (normative) Conversion of test results in constant flow method ..17 IS0 2019 - All rights reserved iii