1、BRITISH STANDARDBS EN 3475-602:2007Aerospace series Cables, electrical, aircraft use Test methods Part 602: ToxicityICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60
2、g53g44g42g43g55g3g47g36g58BS EN 3475-602:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 61215 2National forewordThis British Standard is the UK implementation of EN 3475-602:2007.The UK participati
3、on in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Panel ACE/6/-/2, Aerospace Cables.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to inclu
4、de all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-602Augu
5、st 2007ICS 49.060English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 602: ToxicitySrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 602 : ToxicitLuft- und Raumfahrt - Elektrische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 602: Gi
6、ftigkeitThis European Standard was approved by CEN on 21 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical
7、references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN membe
8、r into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv
9、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels
10、2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-602:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle of method .5 5 Preparation for analysis5 5.1 General5 5.2 Probes
11、 for gas sampling.5 5.3 Gas sampling system for non-reactive gases 6 5.4 Gas sampling for reactive Gases.7 5.5 Checking of sampling systems8 6 Analytical chemistry9 6.1 Colorimetric method of measurement.9 6.2 Potentiometric method of measurement (Wet Analysis) for determination of the halogenides F
12、, Cl .9 7 Requirements.11 8 Report .11 EN 3475-602:20073 Foreword This document (EN 3475-602:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, thi
13、s Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, 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
14、latest by February 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or
15、 all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
16、Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3475-602:20074 1 Scope This test method is intended for use in determining the concentration of specific gas compon
17、ents of smoke released by cable insulation materials. This test method should be used to measure and describe the properties of cable insulation materials in response to heat and flame under controlled laboratory conditions. This standard should be used to measure and describe the properties of prod
18、ucts in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However results of this test may be used as elements of a fire risk assessment whi
19、ch takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undate
20、d references, the latest edition of the referenced document (including any amendments) applies. EN 3475-601, Aerospace series Cables, electrical, aircraft use Test methods Part 601: Smoke density. 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3
21、.1 ppm parts per million, concentration 3.2 colorimetry analytical procedure using colour comparison 3.3 potentiometry determination of ionic concentration by electrochemical measurements 3.4 in situ at the site (in this case: in the NBS chamber) 3.5 halogenides group of chlorides, fluorides, bromid
22、es and iodides They have a strong electrophilic character and are therefore very reactive. 3.6 absorbent liquid suitable for collecting gas components EN 3475-602:20075 3.7 impinger bottle special glass vessel for the absorption solution 3.8 test tube glass tube filled with a special reagent for qua
23、ntitative identification of a specific gas component 3.9 molarity concentration of a solution expressed as mol (gr/molecular weight) of solute per litre of solution 3.10 ISA lonic Strength Adjuster 3.11 NTP Normal Temperature and Pressure 3.12 NBS National Bureau of Standards, Washington 4 Principle
24、 of method The smoke gas produced under the conditions of the smoke density test described in EN 3475-601 is subjected to an analysis depending on the gas components to be investigated. The concentration of non-reactive gas components is determined by means of the colorimetric procedure. In this cas
25、e, test tubes filled with a solid reagent are used; if a specific gas component exists, the indicating layer discolours due to chemical reactions. The length of the colour change is a measure for the concentration. The concentration of the reactive gases is determined by potentiometry; in this case,
26、 electrochemical potentials which can be converted into ppm concentrations after plotting of a calibration curve are measured with ion-specific electrodes in connection with a special reference electrode. 5 Preparation for analysis 5.1 General The specimens arranged vertically in a closed test chamb
27、er, are chemically decomposed according to EN 3475-601 by thermal radiation alone or in combination with flaming. The resulting smoke portions are optically measured according to this test method. In this connection, a gas sample is taken at a time, which has to specified in a test plan. The decompo
28、sition gases resulting from thermal degradation are determined qualitatively and quantitatively by means of the analytical procedure described herein. 5.2 Probes for gas sampling The gases are sampled by means of three probes (internal diameter 6-8 mm) extending into the geometric center of the cham
29、ber. EN 3475-602:20076 Resistant probe materials (such as polypropylene or PTFE) are to be selected due to the reactive behaviour of the halogenides. The probes are to be connected gastight to the tube fittings for gas sampling at the upper side of the test chamber. Connections not used are to be se
30、aled. One of the probes inserted into the chamber is to be provided with a rubber sleeve for attachment of the test tube for colorimetric “in situ“ measurement. 5.3 Gas sampling system for non-reactive gases 5.3.1 General Figures 1 and 2 show the basic set-ups for allowable gas sampling systems. 5.3
31、.2 Pipe system for the gas bag A pipe system with a maximum length of 3 m is to be installed between the gas sampling point at the chamber and the place of gas collection. If the gas pipe system cannot be heated, thermal insulation of the pipes is to be provided so as to avoid the formation of conde
32、nsates. The pipes must have an inner width of 6 mm to 8 mm. Plastic hoses or pipes must be used and, depending on the suitability, polyethylene; butadiene or silicone rubber types can also be used. PTFE are recommended for special requirements with regard to corrosion resistance with temperature loa
33、d. The gas pipe end facing the chamber is to be provided with a stopcock. 5.3.3 Collection of gases Foil bags with a capacity of 10 l to 15 l and a high mechanical and chemical resistance are to be used for the collection of the non-reactive gas components to be analyzed. Polyvinylidene fluoride wit
34、h low gaseous diffusion and water vapour permeability is recommended as foil material so that a change in the gas composition due to diffusion processes is negligible: Permeability of gas for O2max. 20 cm3NTP/m2per 24 h N2max. 6 cm3NTP/m2per 24 h CO2 max. 140 cm3NTP/m2per 24 h Water vapour max. 13 g
35、/m2per 24 h Furthermore, the bags used must be provided with a stopcock. 5.3.4 Gas collection Two approved gas collection processes are available, collection by means of vacuum or by suction pump. Vacuum method: A vacuum tank with a minimum capacity of 15 l is recommended for collecting the gas comp
36、onents to be analyzed in the above-stated foil bag. The design of the tank should be 5 l greater then the volume of the bag. The evacuation pressure is to be monitored by a vacuum gauge. The vacuum tank is to be provided with a ventilation valve and a connection for the vacuum pump. The tank cover o
37、f 10 mm thick acrylic glass minimum is provided with a hole into which a quick-release coupling is to be installed gastight in order to connect the gas bag, on the one side, with the gas pipe, on the other side. A vacuum pump producing a vacuum in the tank capable of filling a gas bag according to w
38、ithin 20 s is to be used. EN 3475-602:20077 Procedure: The shut-off valve at the chamber is to be closed. The gas bag is to be connected to the gas sampling system via the quick-release coupling while ensuring that the shut-off valve at the gas bag is open. The tank is to be sealed with a cover. The
39、 vacuum pump is to be switched on and the following components are to be evacuated: gas pipe; gas bag; vacuum tank. At the time of sampling, the stopcock at the test chamber (1) and the stopcock at the vacuum tank (2) are opened. The other shut-off valves are still closed. After filling of the gas b
40、ag, both stopcocks (1) and (2) in the supply line are to be closed. Then the vacuum tank is vented via the ventilation valve (5) and the pump is switched off. The stopcock at the bag is closed and the filled bag is disconnected from the quick-release coupling and to be immediately analyzed. Suction
41、pump method: The following procedure can also be used as an alternative to the vacuum method for filling the foil bag. The set-up of the equipment up to the suction pump is in accordance with 5.3.2. A manifold is to be installed at the inlet and outlet of the pump as shown in Figure 2. The manifold
42、is used to vent the gas bag and to flush the gas pipe. The suction pump capable of filling a gas bag according to within 20 s is to be used. Procedure: The shut-off valve (1) at the chamber is to be closed. The gas bag is to be connected to the coupling (8) in front of the pump manifold. The shut-of
43、f valves (2) and (4) are to be opened. The shut-off valve at the gas bag is to be opened. The suction pump is to be switched on and the gas bag is to be evacuated. The shut-off valve at the gas bag and the shut-off valve (2) are to be closed and the pump is to be switched off. The shut-off valve (3)
44、 is opened and the shut-off valve (4) is closed. The closed gas bag is to be connected to the coupling (6) at the pump outlet and the shut-off valve at the gas bag is to be opened. At the time of sampling, the shut-off valve (1) at the test chamber is opened. The suction pump is to be switched on. A
45、fter 30 s at the earliest, the shut-off valve (3) is closed and the shut-off valve (4) in front of the gas bag is opened. After filling the gas bag, the shut-off valve (4), the gas bag valve and the chamber shut-off valve (1) are all to be closed. The suction pump is to be switched off. The filled b
46、ag is disconnected from the suction pump and the contents immediately analyzed. 5.4 Gas sampling for reactive Gases 5.4.1 “In situ” measurements for colorimetric determination of Hydrogenchloride (HCI) and Hydrogenfluoride (HF) The samples for measuring the hydrogen fluoride and chloride with colori
47、metric test tubes are taken directly from test chamber by means of a suction pump. The suction capacity of the pump under load must comply with the values specified by the manufacturer of the test tubes. A gas pipe of the material and diameter recommended in 5.3.2 connects the probe to the suction p
48、ump. A shut-off valve is to be installed in front of the suction pump as well as a volumetric flowmeter for flow control. The basic set-up is shown in Figure 3. Procedure: Prior to the commencement of the test, both tips of the test tube are broken off with a tube opener and inserted into the probe
49、with the arrow pointing towards the pump. EN 3475-602:20078 The volumetric suction flow at the suction pump is selected and checked as specified by the manufacturer for the test tube. A certain quantity of the gas sample to be tested, which was specified by the manufacturer, is now sucked through the test tube at the set volumetric suction flow. The existence of the specific gas results in instantaneous discoloration. Observe for cross-sensitivities which are explained in the relevant directions for use. 5.4.2 “In situ” measurement for potentiometric
