1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 2826:2011Aerospace series Burningbehaviour of non metallicmaterials under the influenceof radiating heat and flames Determination of gascomponents in the smokeBS EN 2826:20
2、11 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 2826:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65, Non-metallic materials for aerospace purposes(excluding textiles).A list of organizations represented on this committ
3、ee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72915 7ICS 13.220.40; 49.025.99Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2011.Amendments issued since publicationDate Text affectedBS EN 2826:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2826 February 2011 ICS 13.220.40; 49.025.9
5、9 English Version Aerospace series - Burning behaviour of non metallic materials under the influence of radiating heat and flames - Determinationof gas components in the smoke Srie arospatiale - Comportement au feu des matriaux non mtalliques sous laction de chaleur rayonnante et de flammes - Dtermi
6、nation des composants de gaz de fumeLuft- und Raumfahrt - Brandverhalten nicht metallicher Werkstoffe unter Einwirkung von strahlender Wrme und Flammen - Bestimmung von Rauchgaskomponenten This European Standard was approved by CEN on 17 December 2010. CEN members are bound to comply with the CEN/CE
7、NELEC 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 CEN-CENELEC Management Centre
8、 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 CEN-CENELEC Management Centre has the same status as the o
9、fficial versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
10、Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved world
11、wide for CEN national Members. Ref. No. EN 2826:2011: EBS EN 2826:2011EN 2826:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Short description of the test method .44 Terms and definitions .55 Designation 56 Test equipment 57 Specimens 57.1 Number of specimens .57.2 Conditionin
12、g .57.3 Dimensions and shape of specimens .57.4 Specimen mounting.58 Procedure .59 Gas sampling and analysis .69.1 General 69.2 Sampling by means of plastic bags .69.3 Alternative sampling methods .69.4 Direct sampling using a dosing pump.69.5 Handling of colorimetric tubes .69.6 Determination of ha
13、logens .79.6.1 Hydrogen chloride (using colorimetric tubes) 79.6.2 Hydrogen fluoride and hydrogen chloride (potentiometric measurement; wet analysis) .79.7 Determination of other gases .89.8 After the test .89.9 Sources of errors .810 Test report 8Annex A (normative) Example for a test report on the
14、 determination of gas components in the smoke 9BS EN 2826:2011EN 2826:2011 (E) 3 Foreword This document (EN 2826:2011) 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 t
15、his Association, this 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
16、endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. 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 id
17、entifying any or 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, G
18、ermany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 2826:2011EN 2826:2011 (E) 4 1 Scope This European Standard defines a test method to det
19、ermine the concentration of certain gas components due to pyrolitic decomposition of solid materials and composite materials under the influence of radiant heat only or with simultaneous flame application. NOTE 1 The gas components in the smoke are determined according to the specific environmental
20、and test conditions defined in EN 2824 and this standard. No studies have been made up to now to determine whether the results can be transferred to different conditions, particularly to actual fire conditions. The inhalatory toxical risk and irritancy affect cannot be assessed by merely measuring t
21、he concentration of individual gas components in the smoke. NOTE 2 The burning behaviour and consequently the gas components in the smoke of aerospace materials are not only influenced by the type of material but also to a large extent by the configuration, the specific surface and mass, the combina
22、tion with other materials, the means of joining as well as the processing technique. NOTE 3 These influences shall be taken into account in the preparation of tests, the selection of test specimens and the interpretation of test results. 2 Normative references The following referenced documents are
23、indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2824, Aerospace series Burning behaviour of non-metallic materials under the influenc
24、e of radiating heat and flames Determination of smoke density and gas components in the smoke of materials Test equipment apparatus and media 1)EN 2825, Aerospace series Burning behaviour of non metallic materials under the influence of radiating heat and flames Determination of smoke density EN ISO
25、 13943:2008, Fire safety Vocabulary (ISO 13943:2008) 3 Short description of the test method 3.1 General The specimens are vertically arranged in a closed test chamber according to EN 2824 and subjected to decomposition by radiant heat with or without flame application. During the test, gas samples a
26、re taken at specified intervals from the generated decomposition products to determine the concentration of selected components. The methods described in 3.2 and 3.4 are used to determine the gas components in the smoke. 3.2 The hydrogen chloride (HCl) taken from the test chamber can be indicated di
27、rectly during the test using colorimetric tubes or analyzed by wet analysis. 3.3 Hydrogen fluoride (HF) is measured by wet analysis. 3.4 For determination of other gases, the fumes are collected in a plastic bag with a high gas-isolation value; they can be measured consecutively using colorimetric t
28、ubes. 1) Published as ASD-STAN Prestandard at the date of publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). BS EN 2826:2011EN 2826:2011 (E) 5 4 Terms and definitions For the purposes of this document, the terms and
29、definitions given in EN ISO 13943 apply. 5 Designation EXAMPLE Description block TEST Identity block EN2826A Number of this standard Code letter of test method (see below) A = indicates that the method is used to test a material in the Flaming mode only. B = indicates that the method is used to test
30、 a material in both the Flaming mode and the Norm-Flaming mode. 6 Test equipment Testing shall be carried out in a test chamber according to EN 2824. 7 Specimens 7.1 Number of specimens According to EN 2824. 7.2 Conditioning According to EN 2824. 7.3 Dimensions and shape of specimens According to EN
31、 2824. 7.4 Specimen mounting According to EN 2824. 8 Procedure The specimens conditioned according to EN 2824 are tested in line with the requirements of EN 2825, Clause 8; gas samples are taken according to Clauses 8 and 10. Testing may be carried out concurrently to the determination of the smoke
32、density according to EN 2825. When the specimens are being examined for gas components in the smoke only, the requirements specified for the adjustment of the optical system are not applicable. BS EN 2826:2011EN 2826:2011 (E) 6 9 Gas sampling and analysis 9.1 General The gas-sampling test set-up sha
33、ll conform to EN 2824, Figure 9. Unless otherwise specified, gas sampling shall be started at 4 min. If gas samples are taken during the measurement of smoke, the smoke measurement values may be affected. The point of time indicated for the measurement means the beginning of the measurement, i. e. o
34、f the gas sampling. If the sampling period exceeds 40 s, this shall be noted separately in the test report. 9.2 Sampling by means of plastic bags The sampling by means of plastic bags shall be carried out according to EN 2824, Figure 9. Before starting the test, the sampling bag shall be evacuated.
35、The bag is introduced into the vacuum chamber and then connected to the quick release coupling on the cover. The shut-off valve on the bag is opened and the tubing between test chamber and plastic sampling bag is evacuated. Then the vacuum chamber is evacuated to a pressure of 500 hPa. The sample is
36、 introduced into the test chamber and tested according to EN 2825. The chamber shut-off valve and the valve of the vacuum chamber are opened at the time required for starting the gas measurement. After filling of the bag, both supply line valves shall be closed. The vacuum chamber shall be ventilate
37、d by means of valve 2 2). The shut-off valve 4 2)near the gas bag is closed, the bag is closed and disconnected from the cover. The measuring of the gases contained in the plastic bag shall be carried out within 5 h. The measurement of SO2shall be carried out within 5 min after the end of the sampli
38、ng procedure. 9.3 Alternative sampling methods Alternatively, to the sampling method of filling the bag in a vacuum chamber, other methods may also be appropriate, e.g. filling a sampling bag by a suitable pump. 9.4 Direct sampling using a dosing pump Sampling to measure hydrogen chloride using colo
39、rimetric tubes is affected during the test directly from the test chamber by a dosing pump to EN 2824, 3.15. The sampling system and the dosing pump shall be checked for leakages. 9.5 Handling of colorimetric tubes For handling and/or preparation of the test tubes, the instructions of the manufactur
40、er shall be observed. 2) See EN 2824, Figure 9. BS EN 2826:2011EN 2826:2011 (E) 7 9.6 Determination of halogens 9.6.1 Hydrogen chloride (using colorimetric tubes) Immediately before starting the test, the prepared HCl test tube shall be fixed in the support of the probe in the test chamber. At the s
41、pecified time after start of the test, the supply line to the gas pump shall be opened by shut-off valve and the gas pump shall be switched on. The duration of the pumping operation shall be noted. 9.6.2 Hydrogen fluoride and hydrogen chloride (potentiometric measurement; wet analysis) 9.6.2.1 Measu
42、ring method The quantity of fluoride and chloride is measured by means of an ion specific fluoride or chloride electrode as indicator electrode and a reference electrode (e.g. silver chloride). The corresponding HF or HCl concentration is determined by means of a calibration curve. In order to plot
43、this curve the electrode potentials of some NaF or NaCl buffer solutions with different molarity are determined and plotted in a calibration curve. NOTE 1 When measuring HCl, the presence of sulphur may influence the test results. In this case, Ni(NO3)2shall be added to the test solution. Care shall
44、 be taken to maintain a pH value 3. Moreover, the electrode shall be recalibrated in the presence of Ni(NO3)2. NOTE 2 The presence of bromide, too, substantially influences the measuring of HCl. If the material under test is suspected of containing bromide, this shall be verified by means of other m
45、easuring methods (e.g. ion chromatography). NOTE 3 Products containing large quantities of HCN, NO, and NO2, can affect the amount of HCl measured. It is therefore necessary to adjust the solution to a pH value of 3. 9.6.2.2 Procedure The test set-up shall conform to EN 2824. A scrubber according to
46、 EN 2824 is filled with 10 ml 0,1 molarity CH3COONa, which has been adjusted to pH6, using glacial acetic acid. 1000 cm3of the combustion gas to be tested are passed through this liquid at a flow rate of (400 50) ml/min. The scrubber location in the test chamber shall conform to EN 2824. The content
47、 of the scrubber is put into a 50 ml measuring flask and completed with distilled water, ionic strength adjuster and a buffer solution suitable to bind potentially existing metal ions e.g. a complexing agent such as 1,2 cyclohexylene-dinitrilotetra-acetic acid (monohydrate) up to the measuring mark.
48、 9.6.2.3 Calculation The HF or HCl concentration in Vppmis calculated as follows: Vppm(HF) = )cm 000(1 gas combustion absorbed ofQuantity 10 22,4 ml) (500 (molarity) HF36Vwhere Vppm is the gas concentration in parts, per million; HF (molarity) is the concentration of HF in molecular weight, per litr
49、es; V is the volume of measuring flask, in millilitres, here 50 ml. The HF molarity (mol/l) is determined by inserting the mV readout in the calibration curve. BS EN 2826:2011EN 2826:2011 (E) 8 9.7 Determination of other gases The measurement of other gases is affected by means of sampling bags. The dosing pump extension hose and the sampling bag filled with flue gas are connected by means of the quick release coupling. The corresponding colorimetric tube provided for the measurement of the gas to
