SIST EN ISO 5659-2:2007

Plastics - Smoke generation - Part 2: Determination of optical density by a single-chamber test (ISO 5659-2:2006)

This part of ISO 5659 specifies a method of measuring smoke production from the exposed surface of specimens of essentially flat materials, composites or assemblies not exceeding 25 mm in thickness when placed in a horizontal orientation and subjected to specified levels of thermal irradiance in a closed cabinet with or without the application of a pilot flame. This method of test is applicable to all plastics and may also be used for the evaluation of other materials (e.g. rubbers, textile-coverings, painted surfaces, wood and other materials). It is intended that the values of optical density determined by this test be taken as specific to the specimen or assembly material in the form and thickness tested, and are not to be considered inherent, fundamental, properties. The test is intended primarily for use in research and development and in fire safety engineering of buildings, trains, ships, etc., and not as a basis for ratings for building codes or other purposes. No basis is provided for predicting the density of smoke that maybe generated by the materials upon exposure to heat and flame under other (actual) exposure conditions, nor is any correlation established with measurements derived from other test methods. This test procedure excludes the effect of irritants on the eye.

Kunststoffe - Rauchentwicklung - Teil 2: Bestimmung der optischen Dichte durch Einkammerprüfung (ISO 5659-2:2006)

1.1   Dieser Teil von ISO 5959 legt ein Verfahren zur Messung des Rauches fest, der auf der Oberfläche von Probekörpern entsteht, wenn im Wesentlichen flache Werkstoffe, Verbundstoffe oder vorgefertigte Teile mit einer Dicke von höchstens 25 mm horizontal angeordnet und in einer geschlossenen Prüfkammer mit oder ohne Anwendung einer Zündflamme einer Wärmebestrahlung mit einer bestimmten Intensität ausgesetzt werden. Dieses Prüfverfahren gilt für alle Kunststoffe und darf auch zur Bewertung anderer Werkstoffe (z. B. Gummi, textile Abdeckungen, Flächen mit Farbanstrichen, Holz und andere Baustoffe) angewendet werden.
1.2   Es wird davon ausgegangen, dass die Werte der nach dieser Prüfung bestimmten optischen Dichte für den Probekörper oder das vorgefertigte Teil nur in der untersuchten Form und Dicke spezifisch angesehen werden und nicht als werkstoffspezifische, grundlegende Eigenschaften.
1.3   Die Prüfung ist in erster Linie für die Anwendung in der Forschung und Entwicklung sowie bei der brandschutztechnischen Auslegung von Gebäuden, Zügen, Schiffen usw. und nicht als Bewertungsgrundlage für Bauvorschriften oder sonstige Anwendungen bestimmt. Weder ist eine Vorhersage für die Dichte des Rauches möglich, den Werkstoffe bei einer Beanspruchung durch Wärme und Flammen unter anderen Expositionsbedingungen erzeugen können, noch besteht eine Korrelation zu Messergebnissen, die nach anderen Verfahren ermittelt wurden. Dieses Prüfverfahren schließt den Einfluss von Reizstoffen auf die Augen aus.
ANMERKUNG      Dieses Prüfverfahren berücksichtigt die Verdunkelung des Sichtvermögens durch die Rauchentwicklung, die generell nicht in Beziehung zur Reizwirkung, wie im Teil 1 dieser Norm erklärt, steht.
1.4    Es wird darauf hingewiesen, dass die von einem Werkstoff ausgehende Rauchentwicklung von der Bestrahlungsstärke abhängt, die auf den Probekörper einwirkt. Bei Anwendung der Ergebnisse dieses Verfahrens sollte beachtet werden, dass die Ergebnisse bei einer Beanspruchung durch spez

Plastiques - Production de fumée - Partie 2: Détermination de la densité optique par un essai en enceinte unique (ISO 5659-2:2006)

L'ISO 5659-2:2006 spécifie une méthode pour le mesurage de la production de fumée provenant de la surface exposée des éprouvettes constituées par des matériaux essentiellement plats, des composites ou des assemblages dont l'épaisseur est inférieure à 25 mm, lorsqu'ils sont orientés horizontalement et soumis à des niveaux spécifiés d'éclairement énergétique thermique dans une enceinte fermée, avec ou sans utilisation de flamme pilote. La présente méthode d'essai est applicable à tous les plastiques et peut également être utilisée en vue de l'évaluation d'autres matériaux (par exemple caoutchoucs, revêtements textiles, surfaces peintes, bois et autres matériaux de construction).
Les valeurs de densité optique déterminées par le présent essai sont propres au matériau de l'éprouvette ou de l'assemblage soumis à essai, sous la forme et avec l'épaisseur sélectionnées pour l'essai. Ces valeurs ne doivent pas être considérées comme révélatrices de propriétés de base, inhérentes au produit.
L'essai est principalement destiné à être utilisé en recherche et développement et en ingénierie de sécurité incendie dans les bâtiments, les trains, les navires, etc., et non en tant que base d'appréciation pour des codes de construction ou pour d'autres fins. Aucun élément fondamental n'est fourni pour prévoir la densité de la fumée susceptible d'être produite par les matériaux exposés à la chaleur et à une flamme dans d'autres conditions (réelles) d'exposition, et aucune corrélation n'a été établie avec des mesurages obtenus au moyen d'autres méthodes d'essai. Le présent mode opératoire d'essai ne traite pas de l'effet des irritants sur les yeux.

Polimerni materiali - Nastajanje dima - 2. del: Določanje optične gostote s preskusom v eni preskusni komori (ISO 5659-2:2006)

General Information

• Status: Withdrawn
• Publication Date: 31-Mar-2007
• Withdrawal Date: 08-Apr-2014
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 24-Mar-2014
• Due Date: 16-Apr-2014
• Completion Date: 09-Apr-2014
• Ref Project: EN ISO 5659-2:2006 - Plastics - Smoke generation - Part 2: Determination of optical density by a single-chamber test (ISO 5659-2:2006)

Relations

• Replaced By: SIST EN ISO 5659-2:2014 - Plastics - Smoke generation - Part 2: Determination of optical density by a single-chamber test (ISO 5659-2:2012)
• Effective Date: 01-May-2014
• Replaces: SIST EN ISO 5659-2:2000 - Plastics - Smoke generation - Part 2: Determination of optical density by a single-chamber test (ISO 5659-2:1994, including Technical Corrigendum 1: 1997)
• Effective Date: 01-Apr-2007

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 5659-2:2007
01-april-2007
1DGRPHãþD
SIST EN ISO 5659-2:2000
3ROLPHUQLPDWHULDOL1DVWDMDQMHGLPDGHO'RORþDQMHRSWLþQHJRVWRWHV
SUHVNXVRPYHQLSUHVNXVQLNRPRUL,62
Plastics - Smoke generation - Part 2: Determination of optical density by a single-
chamber test (ISO 5659-2:2006)
Kunststoffe - Rauchentwicklung - Teil 2: Bestimmung der optischen Dichte durch
Einkammerprüfung (ISO 5659-2:2006)
Plastiques - Production de fumée - Partie 2: Détermination de la densité optique par un
essai en enceinte unique (ISO 5659-2:2006)
Ta slovenski standard je istoveten z: EN ISO 5659-2:2006
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 5659-2:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 5659-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 83.080.01; 13.220.40 Supersedes EN ISO 5659-2:1998
English Version
Plastics - Smoke generation - Part 2: Determination of optical
density by a single-chamber test (ISO 5659-2:2006)
Plastiques - Production de fumée - Partie 2: Détermination Kunststoffe - Rauchentwicklung - Teil 2: Bestimmung der
de la densité optique par un essai en enceinte unique (ISO optischen Dichte durch Einkammerprüfung (ISO 5659-
5659-2:2006) 2:2006)
This European Standard was approved by CEN on 30 November 2006.
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, 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: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5659-2:2006: E
worldwide for CEN national Members.

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EN ISO 5659-2:2006 (E)





Foreword


This document (EN ISO 5659-2:2006) has been prepared by Technical Committee ISO/TC 61
"Plastics" in collaboration with Technical Committee CEN/TC 249 "Plastics", the secretariat of
which is held by IBN.

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 June 2007, and conflicting national
standards shall be withdrawn at the latest by June 2007.

This document supersedes EN ISO 5659-2:1998.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
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.


Endorsement notice

The text of ISO 5659-2:2006 has been approved by CEN as EN ISO 5659-2:2006 without any
modifications.

2

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INTERNATIONAL ISO
STANDARD 5659-2
Second edition
2006-12-01

Plastics — Smoke generation —
Part 2:
Determination of optical density
by a single-chamber test
Plastiques — Production de fumée —
Partie 2: Détermination de la densité optique par un essai en enceinte
unique




Reference number
ISO 5659-2:2006(E)
©
ISO 2006

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ISO 5659-2:2006(E)
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ii © ISO 2006 – All rights reserved

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ISO 5659-2:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Principles of the test. 3
5 Suitability of a material for testing. 3
6 Specimen construction and preparation. 3
7 Apparatus and ancillary equipment. 5
8 Test environment. 17
9 Setting-up and calibration procedures. 18
10 Test procedure. 21
11 Expression of results. 24
12 Precision. 24
13 Test report. 25
Annex A (normative) Calibration of heat flux meter . 26
Annex B (informative) Variability in the specific optical density of smoke measured in the single-
chamber test. 27
Annex C (informative) Determination of mass optical density. 29
Annex D (informative) Precision data from tests on intumescent materials . 34
Bibliography . 36

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ISO 5659-2:2006(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 5659-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning
behaviour.
This second edition cancels and replaces the first edition (ISO 5659-2:1994), which has been technically
revised.
ISO 5659 consists of the following parts, under the general title Plastics — Smoke generation:
⎯ Part 1: Guidance on optical-density testing
⎯ Part 2: Determination of optical density by a single-chamber test
⎯ Part 3: Determination of optical density by a dynamic-flow method [Technical Report]

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ISO 5659-2:2006(E)
Introduction
Fire is a complex phenomenon: its development and effects depend upon a number of interrelated factors.
The behaviour of materials and products depends upon the characteristics of the fire, the method of use of the
materials and the environment in which they are exposed (see also ISO/TR 3814 and ISO 13943).
A test such as is specified in this part of ISO 5659 deals only with a simple representation of a particular
aspect of the potential fire situation, typified by a radiant heat source, and it cannot alone provide any direct
guidance on behaviour or safety in fire. A test of this type may, however, be used for comparative purposes or
to ensure the existence of a certain quality of performance (in this case, smoke production) considered to
have a bearing on fire behaviour generally. It would be wrong to attach any other meaning to results from this
test.
The term “smoke” is defined in ISO 13943 as the visible part of fire effluent. It is one of the first response
characteristics to be manifested and should almost always be taken into account in any assessment of fire
hazard as it represents one of the greatest threats to occupants of a building, and other enclosed spaces such
as ships and trains, on fire.
The responsibility for the preparation of ISO 5659 was transferred during 1987 from ISO/TC 92 to ISO/TC 61
on the understanding that the scope and applicability of the standard for the testing of materials should not be
restricted to plastics but should also be relevant to other materials where possible, including building materials.

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INTERNATIONAL STANDARD ISO 5659-2:2006(E)

Plastics — Smoke generation —
Part 2:
Determination of optical density by a single-chamber test
1 Scope
1.1 This part of ISO 5659 specifies a method of measuring smoke production from the exposed surface of
specimens of essentially flat materials, composites or assemblies not exceeding 25 mm in thickness when
placed in a horizontal orientation and subjected to specified levels of thermal irradiance in a closed cabinet
with or without the application of a pilot flame. This method of test is applicable to all plastics and may also be
used for the evaluation of other materials (e.g. rubbers, textile-coverings, painted surfaces, wood and other
materials).
1.2 It is intended that the values of optical density determined by this test be taken as specific to the
specimen or assembly material in the form and thickness tested, and are not to be considered inherent,
fundamental, properties.
1.3 The test is intended primarily for use in research and development and in fire safety engineering of
buildings, trains, ships, etc., and not as a basis for ratings for building codes or other purposes. No basis is
provided for predicting the density of smoke that may be generated by the materials upon exposure to heat
and flame under other (actual) exposure conditions, nor is any correlation established with measurements
derived from other test methods. This test procedure excludes the effect of irritants on the eye.
NOTE This test procedure addresses the loss of visibility due to smoke density, which generally is not related to
irritancy potency, as explained in Part 1 of this International Standard.
1.4 It is emphasized that smoke production from a material varies according to the irradiance level to which
the specimen is exposed. In making use of the results of this method, it should be borne in mind that the
2 2
results are based on exposure to the specific irradiance levels of 25 kW/m and 50 kW/m .
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.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 5659-1, Plastics — Smoke generation — Part 1: Guidance on optical-density testing
ISO 13943, Fire safety — Vocabulary
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ISO 5659-2:2006(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.
3.1
assembly
a fabrication of materials and/or composites
EXAMPLE Sandwich panels.
NOTE The assembly may include an air gap.
3.2
composite
a combination of materials which are generally recognized in building construction as discrete entities
EXAMPLES Coated and laminated materials.
3.3
essentially flat surface
surface which does not deviate from a plane by more than 1 mm
3.4
exposed surface
that surface of the product subjected to the heating conditions of the test
3.5
irradiance
radiant flux incident on an infinitesimal element of the surface containing the point divided by the area of that
element
3.6
material
basic single substance or uniformly dispersed mixture
EXAMPLES Metal, stone, timber, concrete, mineral fibre and polymers.
3.7
mass optical density
MOD
measure of the degree of opacity of smoke in terms of the mass loss of the material
3.8
optical density of smoke
D
measure of the degree of opacity of smoke, taken as the negative common logarithm of the relative
transmission of light
3.9
product
material, composite or assembly about which information is required
3.10
specific optical density
D
s
optical density multiplied by a factor which is calculated by dividing the volume of the test chamber by the
product of the exposed area of the specimen and the path length of the light beam
NOTE See 11.1.
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ISO 5659-2:2006(E)
3.11
specimen
representative piece of the product to be tested together with any substrate or surface coating
NOTE The specimen may include an air gap.
3.12
intumescent material
dimensionally unstable material, developing a carbonaceous expanded structure of thickness > 10 mm during
the test, with the cone heater 25 mm from the specimen
4 Principles of the test
Specimens of the product are mounted horizontally within a chamber and exposed to thermal radiation on
2
their upper surfaces at selected levels of constant irradiance up to 50 kW/m .
The smoke evolved is collected in the chamber, which also contains photometric equipment. The attenuation
of a light beam passing through the smoke is measured. The results are reported in terms of specific optical
density.
5 Suitability of a material for testing
5.1 Material geometry
5.1.1 The method is applicable to essentially flat materials, composites and assemblies not exceeding
25 mm in thickness.
5.1.2 The method is sensitive to small variations in geometry, surface orientation, thickness (either overall
or of the individual layers), mass and composition of the material, and so the results obtained by this method
only apply to the thickness of the material as tested. It is not possible to calculate the specific optical density of
one thickness of a material from the specific optical density of another thickness of the material.
5.2 Physical characteristics
Materials submitted for evaluation by this method could have faces which differ or could contain laminations of
different materials arranged in a different order in relation to the two faces. If either of the faces is likely to be
exposed to a fire condition when in use, then both faces shall be evaluated.
6 Specimen construction and preparation
6.1 Number of specimens
6.1.1 The test sample shall comprise a minimum of twelve specimens if the test is to be carried out in all
2
four modes (see 10.9.1): six specimens shall be tested at 25 kW/m (three specimens with a pilot flame and
2
three specimens without a pilot flame) and six specimens shall be tested at 50 kW/m (three specimens with a
pilot flame and three specimens without a pilot flame).
If the test is carried out in fewer than four modes, a minimum of three specimens shall be tested per mode.
6.1.2 An additional number of specimens as specified in 6.1.1 shall be used for each face, in accordance
with the requirements of 5.2.
6.1.3 An additional twelve specimens (i.e. three specimens per test mode) shall be held in reserve if
required by the modes specified in 10.9.2.
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ISO 5659-2:2006(E)
6.1.4 In the case of intumescent materials, it is necessary to make a preliminary test with the cone heater
50 mm from the specimen, so at least two additional specimens are required.
6.2 Size of specimens
6.2.1 The specimens shall be square, with sides measuring 75 mm ± 1 mm.
6.2.2 Materials of nominal thickness 25 mm or less shall be evaluated at their full thickness. For
comparative testing, materials shall be evaluated at a thickness of 1,0 mm ± 0,1 mm. All materials consume
oxygen when they burn in the chamber, and the smoke generation of some materials (especially rapid-burning
or thick specimens) is influenced by the reduced oxygen concentration in the chamber. As far as possible,
materials shall be tested in their end-use thickness.
6.2.3 Materials with a thickness greater than 25 mm shall be cut to give a specimen thickness of
25 mm ± 0,1 mm, in such a way that the original (uncut) face can be evaluated.
6.2.4 Specimens of multi-layer materials with a thickness greater than 25 mm, consisting of core material(s)
with facings of different materials, shall be prepared as specified in 6.2.3 (see also 6.3.2).
6.3 Specimen preparation
6.3.1 The specimen shall be representative of the material and shall be prepared in accordance with the
procedures described in 6.3.2 and 6.3.3. The specimens shall be cut, sawn, moulded or stamped from
identical sample areas of the material, and records shall be kept of their thicknesses and, if required, their
masses.
6.3.2 If flat sections of the same thickness and composition are tested in place of curved, moulded or
speciality parts, this shall be stated in the test report. Any substrate or core materials for the specimens shall
be the same as those used in practice.
6.3.3 When coating materials, including paints and adhesives, are tested with the substrate or core as used
in practice, specimens shall be prepared following normal practice and, in such cases, the method of
application of the coating, the number of coats and the type of substrate shall be included in the test report.
6.4 Wrapping of specimens
6.4.1 All specimens shall be covered across the back, along the edges and over the front surface periphery,
leaving a central exposed specimen area of 65 mm × 65 mm, using a single sheet of aluminium foil
(approximately 0,04 mm thick) with the dull side in contact with the specimen. Care shall be taken not to
puncture the foil or to introduce unnecessary wrinkles during the wrapping operation. The foil shall be folded in
such a way as to minimize losses of any melted specimen material at the bottom of the specimen holder. After
mounting the specimen in its holder, any excess foil along the front edges shall be trimmed off.
6.4.2 The requirements for backing the wrapped specimens are as follows:
a) Wrapped specimens of thickness up to 12,5 mm shall be backed with a sheet of non-combustible
3 3
insulating board of oven-dry density 850 kg/m ± 100 kg/m and nominal thickness 12,5 mm and a layer
3
of low-density (nominally 65 kg/m ) refractory-fibre blanket under the non-combustible board.
b) Wrapped specimens of thickness greater than 12,5 mm but less than 25 mm shall be backed with a layer
3
of low-density (nominally 65 kg/m ) refractory-fibre blanket.
c) Wrapped specimens of thickness 25 mm shall be tested without any backing board or refractory-fibre
blanket.
6.4.3 For resilient materials, each specimen in its aluminium foil wrapper shall be fitted in the holder in such
a way that the exposed surface lies flush with the inside face of the opening of the specimen holder. Materials
with uneven exposed surfaces shall not protrude beyond the plane of the opening in the specimen holder.
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ISO 5659-2:2006(E)
6.4.4 When thin impermeable specimens, such as thermoplastic films, become inflated during the test
owing to gases trapped between the film and backing, they shall be maintained essentially flat by making two
or three cuts (20 mm to 40 mm long) in the film to act as vents.
6.5 Conditioning
6.5.1 Before preparing the specimens for test, they shall be conditioned to constant mass at 23 °C ± 2 °C
and (50 ± 10) % RH, where constant mass shall be considered to have been reached when two successive
weighing operations, carried out at an interval of 24 h, do not differ by more than 0,1 % of the mass of the test
specimen or 0,1 g, whichever is the greater (see ISO 291).
6.5.2 While in the conditioning chamber, specimens shall be supported in racks so that air has access to all
surfaces.
NOTE Forced-air movement in the conditioning chamber may be used to assist in accelerating the conditioning
process.
The results obtained from this method are sensitive to small differences in specimen conditioning. It is
important, therefore, to ensure that the requirements of 6.5 are followed carefully.
7 Apparatus and ancillary equipment
7.1 General
The apparatus (see Figure 1) shall consist of an airtight test chamber with provision for containing a specimen
holder, radiation cone, pilot burner, light transmission and measuring system and other, ancillary facilities for
controlling the conditions of operation during a test.
7.2 Test chamber
7.2.1 Construction
7.2.1.1 The test chamber (see Figure 1 and Figure 2) shall be fabricated from laminated panels, the inner
surfaces of which shall consist of either a porcelain-enamelled metal not more than 1 mm thick or an
equivalent coated metal which is resistant to chemical attack and corrosion and easily cleaned. The internal
dimensions of the chamber shall be 914 mm ± 3 mm long, 914 mm ± 3 mm high and 610 mm ± 3 mm deep. It
shall be provided with a hinged front-mounted door with an observation window and a removable opaque door
cover to the window to prevent light entering the chamber. A safety blow-out panel, consisting of a sheet of
2
aluminium foil of thickness not greater than 0,04 mm and having a minimum area of 80 600 mm , shall be
provided in the chamber, fastened in such a way as to provide an airtight seal.
The blow-out panel may be protected by a stainless-steel wire mesh. It is important that any such mesh is
spaced at least 50 mm from the blow-out panel to prevent any obstruction in the event of an explosion.
7.2.1.2 Two optical windows, each with a diameter of 75 mm, shall be mounted, one each in the top and
bottom of the cabinet, at the position shown in Figure 2, with their interior faces flush with the outside of the
chamber lining. The underside of the window in the floor shall be provided with an electric heater of
approximately 9 W capacity in the form of a ring, which shall be capable of maintaining the upper surface of
the window at a temperature just sufficient to minimize smoke condensation on that face (a temperature of
50 °C to 55 °C has been found suitable) and which shall be mounted around its edge so as not to interrupt the
light path. Optical platforms 8 mm thick shall be mounted around the windows on the outside of the chamber
and shall be held rigidly in position relative to each other by three metal rods, with a diameter of at least
12,5 mm, extending through the chamber and fastened securely to the platforms.
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ISO 5659-2:2006(E)
7.2.1.3 Other openings in the chamber shall be provided for services as specified and where appropriate.
They shall be capable of being closed so that a positive pressure up to 1,5 kPa (150 mm water gauge) above
atmospheric pressure can be developed inside the chamber (see 7.2.2) and maintained when checked in
accordance with 7.6 and 9.6. All components of the chamber shall be capable of withstanding a greater
positive internal pressure than the safety blow-out panel.
7.2.1.4 An inlet vent with shutter shall be provided in the front of the chamber at the top or on the roof of
the chamber and away from the radiator cone, and an exhaust vent with shutter shall be provided in the
bottom of the chamber lead, via flexible tubing with a diameter of 50 mm to 100 mm, to an extraction fan
capable of creating a negative pressure of at least 0,5 kPa (50 mm water gauge).

Key
1 photomultiplier tube housing
2 radiator cone
3 pilot burner
4 blow-out panel
5 optical-system floor window
Figure 1 — Typical arrangement of test apparatus
6 © ISO 2006 – All rights reserved

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ISO 5659-2:2006(E)
Dimensions in millimetres
(not to scale)

Key
1 exhaust vent
2 wall thermocouple
3 optical platform
4 radiator cone assembly
5 optical window
6 blow-out panel
7 window heater
Figure 2 — Plan view of typical chamber
7.2.2 Chamber pressure control facilities
Provision shall be made for controlling the pressure inside the test chamber. A water manometer, with a range
of up to 1,5 kPa (150 mm water gauge), shall be provided for connection to a pressure regulator and to a tube
in the top of the chamber.
A suitable pressure regulator (see Figure 3) consists of an open water-filled bottle in the front of the chamber
and, inserted 100 mm below to the water surface, a length of flexible tubing of diameter 25 mm; the other end
of the tubing is connected to the manometer and the chamber. The regulator shall be vented to the exhaust
system.
NOTE Another suitable indicating fluid may be used as an alternative to the water-dye solution in the manometer.
© ISO 2006 – All rights reserved 7

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ISO 5659-2:2006(E)
Dimensions in millimetres

Key
1 to exhaust system
2 chamber wall
3 restriction to prevent liquid blow-out
4 effluent from chamber
5 glass jar with cover
6 glass manometer or U-tube (filled to zero mark with water-dye solution)
Figure 3 — Typical chamber pressure relief manometer
7.2.3 Chamber wall temperature
A thermocouple measuring junction, made from wires of diameter not greater than 1 mm, shall be mounted on
the inside of the back wall of the
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