ISO INTERNATIONAL STANDARD 8031 Fourth edition 2020-06 Rubber and plastics hoses and hose assemblies Determination of electrical resistance and conductivity Tuyauxet flexibles en caoutchouc et en plastique-Determination de larésistanceetdelaconductivitéélectriques Referencenumber IS0 8031:2020(E) ISO @ISO 2020 IS0 8031:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS02020 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+4122749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 8031:2020(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normativereferences 3 Termsand definitions ..1 4 Measurement of resistance of conductive, antistatic and non-conductive hoses ..1 4.1 General .1 4.2 Apparatus 4.2.1 Testinstruments 1 4.2.2 .2 Electrodesandcontacts 4.3 Preparation and cleaning for the test 3 4.4 Conditioning .4 4.5 Procedureforhoses withconductinglining (on fullhoselength) 4 4.6 Procedureforhoses with conductingcover .4 4.6.1 Methodforfullhoselengths 4 4.6.2 Methodfortestpieces astested inthelaboratory .5 4.7 Procedure for hoses with conducting compounds throughout .6 4.7.1 Methodforhoses up to 6 m in length .6 .6 4.7.2 Method forhoses over6m inlength 4.8 Hose assemblies fitted withmetal endfittings .6 4.9 Test procedureto determinetheelectricalresistancethroughthewall ofhoses and hose assemblies. .7 4.9.1 .7 General. 4.9.2 Testprocedurefor hoses (without end fittings) 7 4.9.3 Test procedure for hose assemblies with metailic end fittings but without 8 aninternalwirehelixincontactwiththeendfittings 5 Measurement ofelectrical continuitybetweenmetal end fittings of hose assemblies. ..10. 6 Measurement ofelectrical discontinuity ofhose assemblies .10 7 Measurement of electrical resistance of a hose assembly lining (conductive or static dissipating)orhoseassemblycover (conductiveor staticdissipating)incontact with the metal end fitting. .11 7.1 General .11 7.2 .11 Apparatus. 7.3 Preparationand cleaningforthetest .11 7.4 Conditioning .11 7.5 Test procedure. ..11 Test report .13 8 AnnexA (informative)Recommended terminologyand limitsforelectrical conductivity and resistance .15 IS0 2020-All rights reserved ili