BRITISH STANDARD AEROSPACE SERIES BS EN 2155 3 1993 Test methods for transparent materials for aircraft glazing — Part 3 Determination of refractive index The European Standard EN 2155 3 1993 has the[.]
BRITISH STANDARD AEROSPACE SERIES Test methods for transparent materials for aircraft glazing — Part 3: Determination of refractive index The European Standard EN 2155-3:1993 has the status of a British Standard UDC 629.73.023.26:620.1:535.32 BS EN 2155-3:1993 BS EN 2155-3:1993 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1993 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/62 Draft for comment 91/74927 DC ISBN 580 22064 Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standardiseringsraad Suomen Standardisoimisliito, r.y Association franỗaise de normalisation Deutsches Institut fỹr Normung e.V Hellenic Organization for Standardization Technological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Normalisatie-instituut Norges Standardiseringsforbund Instituto Portugs da Qualidade Asociación Espola de Normalización y Certificación Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution Amendments issued since publication Amd No Date Comments BS EN 2155-3:1993 Contents Cooperating organizations National foreword Foreword Introduction Scope and field of application Purpose of the method Definition Apparatus and material Specimens Conditioning Procedure Test report National annex NA (informative) Committees responsible © BSI 11-1999 Page Inside front cover ii 3 3 3 3 Inside back cover i BS EN 2155-3:1993 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN 2155-3:1991 Aerospace Series — Test methods for transparent materials for aircraft glazing — Part 3: Determination of refractive index, published by the European Committee for Standardization (CEN) EN 2155-3 was produced as a result of international discussion in which the UK took an active part A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 4, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 11-1999 EN 2155-3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM January 1993 UDC 629.73.023.26:620.1:535.32 Descriptors: Aircraft industry, glazing, transparent plastics, glass, tests, determination, refractivity English version Aerospace series Test methods for transparent materials for aircraft glazing Part 3: Determination of refractive index Série aérospatiale Méthodes d’essais pour matériaux transparents pour vitrages aéronautiques Partie 3: Détermination de l’indice de réfraction Luft- und Raumfahrt Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen Teil 3: Bestimmung des Brechungsindexes This European Standard was approved by CEN on 1993-01-04 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1993 Copyright reserved to CEN members Ref No EN 2155-3:1993 E EN 2155-3:1993 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA) After inquiries and votes carried out in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 1993, and conflicting national standards shall be withdrawn at the latest by July 1993 According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom © BSI 11-1999 EN 2155-3:1993 Introduction The method described in this standard differs from ISO 489, method A, in the testing conditions Scope and field of application This standard specifies the method used for the determination of the refractive index applicable for transparent materials used in aircraft glazing Purpose of the method This method is used for the control of purity and composition of materials The refractive index shall be considered when designing the parts Definition The refractive index n 23 is the ratio of the velocity D of light in a vacuum to that in the material measured at 23 °C for the sodium D line wavelength 589,3 nanometres Apparatus and material Abbe refractometer or any other refractometer that can be shown to give the same results, the accuracy shall be 0,001 4.2 Source of white light 4.1 4.3 Contacting liquid Saturated aqueous solution of zinc chloride made slightly acid Specimens The test specimen cut from the sample shall be of such a size as will fit on the face of the fixed half of the refractometer prisms For the Abbe refractometer the dimensions are as follows: — mm wide, — 12 mm long, — mm thick For necessary accuracy the surface of the test specimen in contact with the prism shall be sufficiently flat and polished in order to obtain satisfactory contact between the test specimen and the prism This contact is indicated by the dividing line between the light and dark halves of the eyepiece field appearing sharp and straight © BSI 11-1999 A second surface is prepared under the same conditions perpendicular to the first and on one end of the test specimen These two surfaces shall intersect along a sharp line without a bevelled or rounded edge Conditioning The specimen shall be preconditioned at (23 ± 2) °C, (50 ± 5) % relative humidity for at least 48 h prior to testing Before the determination, the apparatus shall reach the same conditions The test is to be performed immediately after conditioning Procedure The procedure for the Abbe refractometer is described herebelow For other refractometers the procedure may be modified if necessary The determination is carried out at (23 ± 0,5) °C A small drop of the contacting liquid is placed on the polished surface of the test specimen which is then placed in firm contact with the surface of the prism with the polished small edge of the specimen towards the source of light The index arm of the refractometer is then adjusted until half of the eyepiece field is dark The compensator (Amici prisms) drum is then adjusted until all colour is removed from the field, after which the index arm is adjusted by means of the vernier until the dividing line between the light and dark portions of the field coincides exactly with the point of intersection of the eyepiece cross hairs The refractive index for the sodium D line is then read on the instrument scale Test report The test report shall include the following information: — reference to this standard — refractive index to the nearest significant figure warranted by the precision and repeatability of measurement (if the refractive index is expressed to more than three significant figures, the wavelength of light for which the measurement was made is also reported) — position on the original sample from which the test specimen was cut blank BS EN 2155-3:1993 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/62 upon which the following bodies were represented: British Plastics Federation Ministry of Defence Society of British Aerospace Companies Limited © BSI 11-1999 BS EN 2155-3:1993 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or 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