EN 2825:2011
(Main)Aerospace series - Burning behaviour of non metallic materials under the influence of radiating heat and flames - Determination of smoke density
Aerospace series - Burning behaviour of non metallic materials under the influence of radiating heat and flames - Determination of smoke density
This European Standard defines a test method for determination of the smoke density due to pyrolitic decomposition of solid materials and composite materials of up to 25 mm in thickness under the influence of radiant heat only or with simultaneous flame application.
The test results enable a comparison of the smoke production of different materials or material configurations under the conditions specified in this standard.
NOTE 1 The smoke gas density is determined according to the specific environmental 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 differing conditions, particularly to actual fire conditions.
NOTE 2 The burning behaviour - and consequently the smoke density - 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 combination with other materials, the means of joining as well as the processing technique.
Luft- und Raumfahrt - Brandverhalten nichtmetallischer Werkstoffe unter Einwirkung von strahlender Wärme und Flammen - Bestimmung der Rauchdichte
Diese Norm legt ein Prüfverfahren zur Bestimmung der Rauchdichte durch pyrolytische Zersetzung von Feststoffen und Verbundmaterialien von bis zu 25 mm Dicke unter der Einwirkung von Wärmestrahlung allein oder bei gleichzeitiger Flammeinwirkung fest.
Die Prüfergebnisse ermöglichen einen Vergleich der Rauchentwicklung verschiedener Materialien oder Materialkonfigurationen unter den in dieser Norm festgelegten Bedingungen.
ANMERKUNG 1 Die Rauchgasdichte wird gemäß den in EN 2824 und dieser Norm festgelegten, spezifischen Umgebungs- und Prüfbedingungen bestimmt. Bisher liegen keine Untersuchungen dazu vor, ob sich die Ergebnisse auf andere Bedingungen übertragen lassen, insbesondere auf den tatsächlichen Brandfall.
ANMERKUNG 2 Das Brandverhalten – und folglich die Rauchdichte – von Werkstoffen in der Luft- und Raumfahrt werden nicht allein durch den Werkstofftyp bestimmt, sondern in hohem Maße auch durch die Konfiguration, die spezifische Oberfläche und Masse, die Kombination mit anderen Werkstoffen, das Fügeverfahren sowie die Verarbeitungsmethode.
Série aérospatiale - Comportement au feu des matériaux non métalliques sous l'action de chaleur rayonnante et de flammes - Détermination de la densité de fumée
Aeronavtika - Gorljivost nekovinskih materialov zaradi žarčenja toplote in plamena - Ugotavljanje gostote dima
Ta evropski standard opredeljuje preskusno metodo za ugotavljanje gostote dima zaradi pirolitske razgradnje trdnih materialov in kompozitnih materialov debeline do 25 mm samo pod vplivom žarčenja toplote ali s hkratno uporabo ognja. Preskusni rezultati omogočajo primerjavo proizvodnje dima iz različnih materialov ali konfiguracij materialov pod pogoji, določenimi v tem standardu.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2011
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Aerospace series - Burning behaviour of non metallic materials under the influence of
radiating heat and flames - Determination of smoke density
Luft- und Raumfahrt - Brandverhalten nicht metallischer Werkstoffe unter Einwirkung von
strahlender Wärme und Flammen - Bestimmung der Rauchdichte
Série aérospatiale - Comportement au feu des matériaux non métalliques sous l'action
de chaleur rayonnante et de flammes - Détermination de la densité de fumée
Ta slovenski standard je istoveten z: EN 2825:2011
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
49.025.01 Materiali za letalsko in Materials for aerospace
vesoljsko gradnjo na splošno construction in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 2825
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2011
ICS 13.220.40; 49.025.99
English Version
Aerospace series - Burning behaviour of non metallic materials
under the influence of radiating heat and flames - Determination
of smoke density
Série aérospatiale - Comportement au feu des matériaux Luft- und Raumfahrt - Brandverhalten nichtmetallischer
non métalliques sous l'action de chaleur rayonnante et de Werkstoffe unter Einwirkung von strahlender Wärme und
flammes - Détermination de la densité de fumée Flammen - Bestimmung der Rauchdichte
This European Standard was approved by CEN on 17 December 2010.
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 CEN-CENELEC 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 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 official 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2825:2011: E
worldwide for CEN national Members.
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Short description of the test method .4
4 Terms and definitions .4
5 Designation .5
6 Test equipment .5
7 Specimens .5
7.1 Number of specimens .5
7.2 Conditioning .5
7.3 Dimensions and shape of specimens .5
7.4 Specimen mounting.5
8 Procedure .5
9 Calculation of test results .7
10 Test report .7
Annex A (normative) Example for a test report on the determination of smoke density .8
Foreword
This document (EN 2825:2011) 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 this 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 endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at
the latest by October 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 identifying 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard defines a test method for determination of the smoke density due to pyrolitic
decomposition of solid materials and composite materials of up to 25 mm in thickness under the influence of
radiant heat only or with simultaneous flame application.
The test results enable a comparison of the smoke production of different materials or material configurations
under the conditions specified in this standard.
NOTE 1 The smoke gas density is determined according to the specific environmental 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
differing conditions, particularly to actual fire conditions.
NOTE 2 The burning behaviour - and consequently the smoke density - 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 combination with
other materials, the means of joining as well as the processing technique.
2 Normative references
The following referenced documents are 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 influence of radiating
heat and flames — Determination of smoke density and gas components in the smoke of materials — Test
1)
equipment apparatus and media
EN ISO 13943:2008, Fire safety — Vocabulary
3 Short description of the test method
The specimens are vertically arranged in a closed test chamber according to EN 2824 and subjected to
decomposition by radiant heat only or with flame application. The smoke density is measured by means of the
reduction of light transmission as smoke accumulates and expressed in terms of specific optical density which
is derived from a geometric factor and the measured light obscuration.
4 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 13943 apply.
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).
5 Designation
EXAMPLE
Description block Identity block
TEST EN2825A
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 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 2824.
7.4 Specimen mounting
According to EN 2824.
8 Procedure
8.1 When performing the test, precautions shall be taken to remove potentially hazardous gases from the
area of operation.
8.2 During the warm-up period, all electric systems (furnace, light source, photometer-readout) shall be
switched on, the exhaust vent and chamber door shall be closed and the inlet vent be open. When the
temperature on the centre surface of the back wall has reached a steady-state value of (35 ± 2) °C, the
chamber is ready for calibrating or testing. To increase the chamber wall surface temperature to the stated
level, an auxiliary heater may be used, but shall be removed prior to performing tests. Conversely, to
decrease this temperature, the exhaust blower may be used to introduce cooler air. The furnace shall be
calibrated at periodic intervals.
8.3 A specimen holder with inserted calcium silicate sheet shall always be located directly in front of the
furnace, except when it is replaced by the specimen holder during a test or the radiometer during calibration. It
shall be returned immediately to this position when testing or calibration is completed to prevent excessive
heating of the opposite wall surface.
8.4 During the daily calibration, the radiometer shall be placed on the horizontal rods of the furnace support
framework and accurately positioned in front of the furnace opening by displacing the "blank" specimen holder
against the prepositioned stop. With the chamber door closed and the inlet vent opened, the compressed air
supply to the radiometer cooler shall be adjusted to maintain the radiometer body temperature at (93 ± 3) °C.
After the system has reached steady-state the furnace transformer shall be adjusted to obtain - as per
radiometer calibrating curve - an output signal corresponding to an irradiance of (25,0 ± 0,5) kW/m averaged
over the radiometer receiver area. After the prescribed irradiance level has reached steady-state, the
radiometer shall be removed from the chamber and replaced by the "blank" specimen holder. A suitable
voltmeter or recorder shall indicate the radiometer signal.
The calibration of the radiometer has to be checked regulary because the characteristics may change by use.
The whole system has to be verified finally by testing standardized samples or by comparative testing.
8.5 After the system has reached steady-state (end of warm-up period), the amplifier sensitivity shall be
adjusted to obtain a 100 % transmittance indication in the least sensitive measuring range with free light path.
The "dark current" reading shall be set to zero by compensating the dark current with the light beam blocked
in the most sensitive measuring range of the photometer to 0 % transmittance. Prior to commencing the test
the zero line of the recorder shall be adjusted accordingly.
8.6 For non-flaming exposures the burner shall be removed. For flaming exposures the burner shall be
positioned in front of the lower edge of the specimen, as described in 8.3 and Figure 8 of EN 2824. The burner
distances relative to the blank specimen holders shall be checked prior to testing.
8.7 Before accurately positioning the specimen in front of the furnace, the chamber shall be flushed for
about 2 min with the door and exhaust and inlet vents open. The wall temperature, measured with the back
wall thermocouple according to EN 2824, shall be verified when starting the test (see 8.2).
8.8 The exhaust vent and blower shall be closed. The loaded specimen holder shall be placed on the bar
support and pushed into position in front of the furnace by displacing the blank holder to the stop. The
chamber door shall be closed quickly, starting simultaneously the recorder or plotter. The inlet vent shall only
be completely closed when the photometer indicates the presence of smoke.
8.9 The light transmittance and the corresponding time shall recorded as a continuous plot. The necessary
full-scale range changes shall be made and noted in decade steps.
The percentage error of a reading becomes progressively worse at the lower portion of the scale. Avoid light
transmittance measurement on scale readings less than 10 by making the appropriate decade range change.
8.10 The increase in chamber pressure shall be observed using the manometer described in EN 2824. If
negative pressure develops after very intense burning of specimen, the inlet vent shall be slightly opened for
pressure equalization.
Duri
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