www bzfxw com BRITISH STANDARD BS EN 702 1995 Protective clothing — Protection against heat and flame — Test method Determination of the contact heat transmission through protective clothing or its ma[.]
BRITISH STANDARD Protective clothing — Protection against heat and flame — Test method: Determination of the contact heat transmission through protective clothing or its materials The European Standard EN 702:1994 has the status of a British Standard BS EN 702:1995 BS EN 702:1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PSM/35, Clothing for protection against heat and flame, upon which the following bodies were represented: Amalgamated Engineering Union British Clothing Industry Association British Foundry Association British Leather Confederation British Railways Board British Steel plc British Textile Confederation British Textile Technology Group Chemical Industries’ Association Chief and Assistant Chief Fire Officers’ Association Confederation of British Wool Textiles Limited Health and Safety Executive Home Office Industrial Safety (Protective Equipment) Manfacturers’ Association Institute of Occupational Hygienists Institute of Purchasing and Supply Institution of Fire Engineers International Wool Secretariat Lambeg Industrial Research Association Medical Research Council Ministry of Defence Society of British Gas Industries Trades Union Congress This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 May 1995 © BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PSM/35 Draft for comment 92/39066 DC ISBN 580 23995 Amendments issued since publication Amd No Date Comments BS EN 702:1995 Contents Committees responsible National foreword Foreword Text of EN 702 © BSI 03-1999 Page Inside front cover ii i BS EN 702:1995 National foreword This British Standard has been prepared by Technical Committee PSM/35 and is the English language version of EN 702:1994 Protective clothing — Protection against heat and flame — Test method: Determination of the contact heat transmission through protective clothing or its materials, published by the European Committee for Standardization (CEN) EN 702 was produced as a result of international discussions in which the United Kingdom 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 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 03-1999 EUROPEAN STANDARD EN 702 NORME EUROPÉENNE November 1994 EUROPÄISCHE NORM ICS 13.340.10 Descriptors: Personal protective equipment, accident prevention, protective clothing, heat protection, fire protection, tests, determination, heat transfer, testing conditions English version Protective clothing — Protection against heat and flame — Test method: Determination of the contact heat transmission through protective clothing or its materials Vêtements de protection — Protection contre la chaleur et la flamme — Méthode d’essai: Détermination de la transmission thermique par contact travers les vêtements de protection ou leurs matériaux Schutzkleidung — Schutz gegen Hitze und Flammen — Prüfverfahren: Bestimmung des Kontaktwärmedurchgangs durch Schutzkleidungen oder deren Materialien ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This European Standard was approved by CEN on 1994-11-10 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 © 1994 Copyright reserved to CEN members Ref No EN 702:1994 E EN 702:1994 Foreword This European Standard has been prepared by Technical Committee CEN/TC 162, Protective clothing including hand and arm protection and lifejackets, of which the secretariat is held by DIN This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s) This European Standard corresponds to ISO 12127 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 May 1995, and conflicting national standards shall be withdrawn at the latest by May 1995 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, United Kingdom Contents Foreword Scope Definitions Principle Apparatus Sampling and conditioning Test method Test report Figure — Heating cylinder Figure — Calorimeter Figure — Assembly Page 3 3 4 4 5 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 EN 702:1994 Scope Apparatus This European Standard specifies a test method for the determination of the contact heat transmission It is applicable to protective clothing (including hand protectors) or its constituent materials intended to protect against high contact temperature The application of the standard is restricted to contact temperatures from 100 °C to 500 °C 4.1 Heating cylinder Definitions For the purposes of this standard, the following definitions apply 2.1 contact temperature Tc the surface temperature of the contact area of the heating cylinder which is kept constant 2.2 start of the time measurement the moment when the upper surface of the calorimeter and the bottom edge of the heating cylinder have approached to 10 mm 2.3 threshold time tt 4.2 Calorimeter The calorimeter as shown in Figure consists of a cylindrical disc of black anodized pure aluminium of (25 ± 0,05) mm diameter and (5 ± 0,02) mm thickness which is fixed on a mounting made from polyamide 6.6 The upper contact surface of the calorimeter shall be surface ground before anodization and on the lower surface a temperature sensor (e.g platinum resistor) shall be fixed ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ the time between the start of the time measurement and the moment when the temperature of the calorimeter is 10 °C above its starting value 2.4 contacting speed the relative speed by which the heating cylinder and calorimeter with the sample are brought into contact with each other 2.5 contact force the force acting on the specimen and the calorimeter when they have been brought into contact with the heating cylinder Principle The heating cylinder is heated up to the contact temperature and the specimen is placed on to the calorimeter The heating cylinder is lowered on to the specimen supported by the calorimeter, or alternatively, the calorimeter with the specimen is lifted up to the heated cylinder; in each case the operation shall be carried out at a constant speed By monitoring the temperature of the calorimeter, the threshold time is determined © BSI 03-1999 The heating cylinder is constructed from a suitable metal which can withstand temperatures up to over 500 °C (e.g pure nickel) Figure shows a possible version of the heating cylinder The contact surface shall have a diameter of (25,2 ± 0,05) mm and shall be surface ground A central boring ends mm above the lower surface of the heating cylinder This boring is intended to hold the temperature sensor, necessary for the temperature regulation of the heating cylinder, and its diameter should be chosen accordingly A spiral slot of depth D, width B and pitch Z is machined in the upper part of the heating cylinder D, B and Z shall be chosen in such a way that the total heated length of a heating conductor can be placed in the slot The heating cylinder shall be enclosed by a heat resistant insulation, leaving free the bottom contact surface 4.3 Assembly Figure shows a possible version of the assembly The heating cylinder and calorimeter are mounted with parallel faces and with their symmetrical axes in line in a supporting frame Provision shall be made for a controlled speed movement of either the heating cylinder down towards the calorimeter or the calorimeter up towards the heating cylinder The additional weight shall be dimensioned in such a way that the contact force is (49 ± 0,5) N Between measurements, during cooling periods, a suitable shielding shall be put between the heating cylinder and calorimeter in order to prevent the calorimeter from being heated up by the thermal radiation of the heating cylinder 4.4 Electronics Suitable electronic devices shall be provided to: — heat up the heating cylinder to at least 500 °C and control the temperature; — control the contacting speed; — measure and register the calorimeter temperature to an accuracy of ± 0,1 °C; — measure the threshold time EN 702:1994 Sampling and conditioning 5.1 Sampling At least three circular specimens of 80 mm diameter shall be taken for each contact temperature from the product or from a piece of the material intended for the manufacture of the product 5.2 Conditioning Before the test the specimens shall be conditioned for at least 24 h in an atmosphere of (20 ± 2) °C and (65 ± 5) % relative humidity Test method 6.1 Starting conditions The measurements shall be carried out in an atmosphere having a temperature of (20 ± 5) °C and a relative humidity between 15 % and 80 % The heating cylinder shall be brought to the selected contact temperature ± % (in °C) The temperature of the calorimeter shall be at room temperature ± °C before the start of each test The test shall be started not later than after the specimen has been taken out of the conditioning atmosphere according to 5.2 6.2 Procedure Place the specimen on the calorimeter so that its outer face looks upward Remove the shielding between the heated cylinder and the calorimeter and bring the heated cylinder into contact with the calorimeter with a contacting speed of (5,0 ± 0,2) mm/s Measure and record the temperature of the calorimeter during the test Carry out at least three measurements at each contact temperature 6.3 Evaluation ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Heating cylinder Determine the threshold time tt to the nearest 0,1 s Test report The test report shall contain the following particulars: a) reference to this European Standard; b) name of supplier of product or material; c) name, as given by the supplier, and description of the product or the material; d) contact temperature(s) Tc; e) threshold time tt: individual values or, if five or more measurements per contact temperature have been made, mean value and standard deviation; f) description of observed changes of the specimens; g) date of testing; h) any deviation from this standard © BSI 03-1999 EN 702:1994 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Calorimeter © BSI 03-1999 Figure — Assembly BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | 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