BRITISH STANDARD AEROSPACE SERIES BS EN 2155 14 1993 Test methods for transparent materials for aircraft glazing — Part 14 Determination of the 1/10 Vicat softening temperature The European Standard E[.]
BRITISH STANDARD AEROSPACE SERIES Test methods for transparent materials for aircraft glazing — Part 14: Determination of the 1/10 Vicat softening temperature The European Standard EN 2155-14:1993 has the status of a British Standard UDC 629.73.023.26:620.1:536.421.2 BS EN 2155-14:1993 BS EN 2155-14:1993 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 Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y France Association franỗaise de normalisation Germany Deutsches Institut für Normung e.V Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugs da Qualidade Spain Asociación Espola de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution 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 Amendments issued since publication © BSI 12-1999 Amd No The following BSI references relate to the work on this standard: Committee reference ACE/62 Draft for comment 91/74928 DC ISBN 580 22067 Date Comments BS EN 2155-14:1993 Contents Cooperating organizations National foreword Foreword Introduction Scope and field of application Principle Apparatus Specimens Procedure Test report Figure — Schematic diagram of apparatus for the determination of the Vicat softening temperature National annex NA (informative) Committees responsible © BSI 12-1999 Page Inside front cover ii 3 3 3 Inside back cover i BS EN 2155-14:1993 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 2155-14:1993 Aerospace series — Test methods for transparent materials for aircraft glazing — Part 14: Determination of the /10 Vicat softening temperature, published by the European Committee for Standardization (CEN) EN 2155-14 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 6, 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 12-1999 EN 2155-14 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM February 1993 UDC 629.73.023.26:620.1:536.421.2 Descriptors: Aircraft industry, glazing, transparent plastics, glass, tests, determination, softening point English version Aerospace series Test methods for transparent materials for aircraft glazing Part 14: Determination of the 1/10 Vicat softening temperature Série aérospatiale — Méthodes d’essais pour matériaux transparents pour vitrages aéronautiques Partie 14: Détermination du point de ramollissement Vicat 1/10 Luft- und Raumfahrt — Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen Teil 14: Bestimmung der 1/10-Vicat Erweichungstemperatur This European Standard was approved by CEN on 1993-02-19 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 2155-14:1993 E EN 2155-14:1993 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 August 1993, and conflicting national standards shall be withdrawn at the latest by August 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 12-1999 EN 2155-14:1993 Introduction The method described in this standard differs from ISO 306, method A, in the penetration depth Scope and field of application This standard specifies the method used for the determination of the 1/10 VICAT softening temperature of transparent thermoplastic materials used for aircraft glazing Principle Determination of the temperature at which a standard indenter under a load of 9,81 N penetrates 0,1 mm into the surface of a test specimen; this temperature is attained during a defined uniform rate of increase of temperature The temperature corresponding to the 0,1 mm penetration is called 1/10 VICAT softening temperature; it is expressed in °C Apparatus The apparatus consists essentially of: 3.1 A rod provided with a load carrying plate, held in a rigid metal frame so that it can move freely and vertically, the base of the frame serving to support the specimen under the indenter at the end of the rod (see Figure) 3.2 Indenting tip An indenting tip, preferably of hardened steel, mm long, of circular cross-section and area (1,000 ± 0,015) mm2 is fixed at the bottom of the rod The lower surface of the indenting tip shall be flat and perpendicular to the axis of the rod and free from burrs 3.3 Micrometer dial gauge (or other suitable measuring instrument) A micrometer dial gauge (or other suitable measuring instrument), graduated in divisions of 0,01 mm, shall be used to measure the penetration of the indenter into the specimen The thrust of the dial gauge, which contributes to the thrust on the specimen, shall be known and shall comply with clause 3.4 below 3.4 A load carrying plate shall be fitted to the rod (3.1 ) and a slotted weight adjusted centrally such that the total load applied to the test specimen can be made up to between 9,81 N and 10,30 N The combined masses of the rod, indenter and load carrying plate shall not exceed 100 g NOTE The construction of the apparatus shall be such that the micrometer dial gauge reading caused by differential thermal expansion over the intended temperature range does not exceed 0,02 mm when the specimen is replaced by a piece of borosilicate glass or low thermal expansion alloy steel © BSI 12-1999 It is recommended that the apparatus be constructed of low thermal expansion alloy 3.5 A heating bath, containing a suitable liquid (see note 1), shall be provided in which the apparatus is placed so that the specimen is at least 35 mm below the surface of the liquid An efficient stirrer shall be provided The heating bath shall be equipped with a means of control so that the temperature can be raised at a uniform rate of (50 ± 5) K per hour (see note 2) 3.6 A mercury in glass thermometer (or other accurate temperature measuring device), of appropriate range and with graduations at least at each 0,5 K shall be used to measure temperature The scale error at any reading shall not exceed 0,5 K NOTE A suitable liquid heat transfer media shall be used In all cases, it shall be established that the liquid chosen is stable at the temperature used and does not affect the material under test NOTE A uniform rate of temperature rise can be obtained by controlling the heat input either manually or automatically, although the latter is strongly recommended One method of operation found to be satisfactory is to provide an immersion heater adjusted to give the correct rate of temperature rise at the starting temperature of the test and then to increase the power input (either in the same heater or in a subsidiary heater) by adjustment of a rheostat or variable transformer NOTE It is desirable to have a cooling coil in the liquid bath in order to reduce the time required to lower the temperature after previous determinations It shall be removed or drained before starting a test, as boiling of coolant may affect the rate of temperature rise Specimens Two specimens shall be used to test each sample Their surfaces shall be flat and parallel 4.2 For sheet materials, the thickness of the test specimens shall be equal to the thickness of the sheet However: a) if the thickness exceeds mm, the specimens shall be reduced in thickness to approximately mm by machining one surface, the other surface being left intact, b) if the thickness of the sheet is less than mm, not more than three pieces shall be stacked together to give a total thickness of between mm and mm 4.1 Procedure The specimen is mounted horizontally under the indenting tip (3.2 ) of the unloaded rod (3.1 ) see Figure The tip of the indenter shall at no point be nearer to the edge of the test specimen than mm The surface of the test specimen in contact with the base of the apparatus shall be flat 5.1 EN 2155-14:1993 5.2 The assembly is immersed in the heating bath (3.5 ), the temperature of which shall be constant and at least 50 K below the expected softening temperature of the material (see note 3, clause ) The bulb of the thermometer (3.6 ) shall be at the same level as, and as close as is practical to the specimen 5.3 The slotted weight is then added to the load carrying plate (3.4) such that the total thrust on the specimen is between 9,81 N and 10,30 N After min, with the indenter still in position, the reading of the micrometer dial gauge is noted or the micrometer (3.3 ) is set to zero 5.4 The temperature of the bath is then raised at a uniform rate of (50 ± 5) K per hour The liquid is well stirred during the test 5.5 The temperature of the bath at which the indenting tip has penetrated into the specimen by 0,1 mm beyond its starting position defined in clause 5.3 is noted and recorded as the 1/10 VICAT softening temperature (1/10 VST) of the specimen 5.6 The 1/10 VST of the material under test is expressed as the arithmetic mean of the 1/10 VST’s of two specimens If the individual results differ by more than K it shall be verified that the test has been carried out correctly Test report The test report shall include the following information: — reference to this standard, — VICAT softening temperature (1/10 VST) of the material, — if composite specimens are used, ie more than one layer, then the thickness and number of layers shall be stated, — the nature of the immersion medium, — any particular characteristics of the specimen noted during the test or after removal from the apparatus © BSI 12-1999 EN 2155-14:1993 Figure — Schematic diagram of apparatus for the determination of the Vicat softening temperature © BSI 12-1999 blank BS EN 2155-14:1993 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 12-1999 BS EN 2155-14:1993 BSI — British Standards Institution BSI is the independent national body 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