ISO INTERNATIONAL STANDARD 2064 Third edition 1996-10-01 Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness Revetements metalliques etautres revetements inorganiques-Definitions et principes concernant le mesurage de I'epaisseur ISO Reference number ISO 2064:1996(E) Copyright Intermational Organization for Standardization rovided by IHS rmitted without license from IHS Not for Resale ISO 2064:1996(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which atechnicalcommitteehasbeenestablishedhastherighttoberepresented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. ISO collab- orates closely with the international Electrotechnical Commission (IEC) on allmattersofelectrotechnicalstandardization Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 2064 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 2, Methodsofinspectionandcoordinationoftestmethods This third edition cancels and replaces the second edition (ISO 2064:1980), of which it constitutes a technical revision. @ISO1996 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii Copyright Intemational Oorganizatin for Standardization ed without license from IHS Not for Resale ISO 2064:1996(E) @ISO Introduction An important requirement of most coating specifications is that the coating have a thickness not less than a given value (and in a few cases not greater than a given value). The method to be used for measuring the thickness of a particular coating is laid down in the coating specification. The main purpose of this International Standard is to define exactly what is meant by the term “minimum thickness” when used in specifications for metallic and related coatings. In this context, the minimum thickness is de- fined as a local thickness over a small area. With some methods, for example the microscopical method, isO 1463, it is possible to detect appreciable variations in thickness across extremely small areas (for example pits or cracks) which might be considered as However, with other test methods (for example the coulometric method, Iso 2177:1985, Metallic coatings - Measurement of coating thickness Therefore, the only practicable definition of minimum thickness is one that allows comparable results to be obtained by any of the approved test methods. Hence the minimum thickness should be a local thickness over an area that is as small as practicable, but not too small to accommodate measurements by the chosen method. In order to obtain consistent results, such tests on the reference area should be taken as the local thickness. In practice, it is usually permissible to test the coating at any place on the significant surface in order to find the minimum thickness on an article. be thinnest and so the definition of minimum thickness is the lowest value of local thickness (as defined in clause 3) found by the chosen method. In the case of some coatings, such as hot-dipped and sprayed metal coat- ings,thecoatingspecificationsmaycallforcompliancewithaminimumlo defined in this International Standard and the relevant product specifi- cationsshouidbeconsuited. Copyriaht Intemational Oorganizatin for Standardization ili d without license from I