IEC_62073ed1.0en.pdf

TECHNICALSPECIFICATIONIEC TS 62073First edition2003-06Guidance on the measurement of wettabilityof insulator surfacesMesure de lhydrophobicitde la surface des isolateursReference numberIEC/TS 62073:2003(E)Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(http:/www.iec.ch/searchpub/cur_fut.htm)enables you to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just Published This summary of recently issued publications(http:/www.iec.ch/online_news/justpub/jp_entry.htm)is also available by email.Please contact the CustomerService Centre(see below)for further information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00TECHNICALSPECIFICATIONIECTS 62073First edition2003-06Guidance on the measurement of wettabilityof insulator surfacesMesure de lhydrophobicitde la surface des isolateursPRICE CODE IEC 2003 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chSFor price,see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical Commission 2 TS 62073 IEC:2003(E)CONTENTSFOREWORD.4INTRODUCTION.61Scope and object.72Terms and definitions.73Methods for measurement of wetting properties.94Method A Contact angle method.104.1General.104.2Equipment.104.3Measurement procedure.104.4Evaluation.115Method B Surface tension method.115.1General.115.2Safety precautions.125.3Equipment and reagents.125.4Measurement procedure.125.5Evaluation.136Method C The spray method.136.1General.136.2Equipment.136.3Measurement procedure.136.4Evaluation.147Documentation.15Annex A(normative)Guidelines regarding the applicability and comments on thelimitations of the different methods described in this technical specification.16Annex B(normative)Method A Contact angle method.18Annex C(normative)Method B Surface tension method.19Annex D(normative)Method C Spray method.21Figure 1 Definition of the static contact angle.8Figure 2 Definition of the advancing angle(a)and the receding angle(r)inside a liquid drop resting on an inclined solid surface.9Figure 3 Measurements of the advancing angle(a)and the receding angle(r)by adding or withdrawing water from a droplet.11Figure B.1 Measurement of the advancing angle(a)and the receding angle(r)by using the captive bubble technique.18TS 62073 IEC:2003(E)3 Table 1 Criteria for the determination of wettability class(WC).14Table C.1 Concentrations of ethylene-glycol-monoethyl-ether(cellosolve),formamidemixtures used in measuring surface tension of insulator surfaces in the range 30 mN/mto 56 mN/m(T=20 C).19Table C.2 Concentrations of distilled water and formamide mixture used in measuringsurface tension of insulator surfaces in the range 58 mN/m to 73 mN/m(T=20 C).20Table C.3 Concentrations of distilled water and sodium chloride in mixtures usedin measuring surface tension of insulator surfaces in the range 73 mN/m to 82 mN/m(T=20 C).20 4 TS 62073 IEC:2003(E)INTERNATIONAL ELECTROTECHNICAL COMMISSION_GUIDANCE ON THE MEASUREMENT OF WETTABILITYOF INSULATOR SURFACESFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the e