BS ISO BRITISH STANDARD 20508:2003 Fine ceramics (advanced ceramics, advanced technical ceramics)- Determination of light transmittance of ceramic films with transparent substrate ICS 81.060.30 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTL British Standards BS ISO 20508:2003 National foreword This British Standard reproduces verbatim IS0 20508:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled "International Standards Correspondence Index", or by using the “Search" facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and ii, a blank page, pages 1 to 4, an inside back cover and a back cover The BSI copyright notice displayed in this document indicates when the documentwaslastissued. Amendments issued since publication This British Standard was published under the authority Amd. No. Date Comments of the Standards Policy and Strategy Committee on 13February2004 @ BSI 13 February 2004 ISBN 0 580 43442 7 BS ISO 20508:2003 INTERNATIONAL ISO STANDARD 20508 First edition 2003-12-01 Fine ceramics (advanced ceramics, advanced technical ceramics) : Determination of light transmittance of ceramic films with transparent substrate Céramiques techniques - Détermination de la transmission de la lumiere des films céramiques avec substrats transparents Reference number ISO 20508:2003(E) ISO BS ISO 20508:2003 ii BS ISO 20508:2003 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with ISO, also take part in the work. iSO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. 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. rights. isO shall not be held responsible for identifying any or all such patent rights. ISO 20508 was prepared by Technical Committee ISO/TC 206, Fine ceramics ii BS ISO 20508:2003 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of light transmittance of ceramic films with transparent substrate 1 Scope This International Standard specifies a test method for determining the visible light transmittance of a transparent coating material, e.g., the transparent electrode for display devices, in which a fine ceramic thin film non-parallelfacedtestpieces.Atranslucentmediumisnot included inthisInternationalStandard 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 transmittance proportion of incident light which is transmitted through a transparent or semi-transparent