SIST EN ISO 5659-2:2017

SLOVENSKI STANDARD
01-september-2017
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SIST EN ISO 5659-2:2014
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SUHVNXVRPYHQLSUHVNXVQLNRPRUL,62
Plastics - Smoke generation - Part 2: Determination of optical density by a single-
chamber test (ISO 5659-2:2017)
Kunststoffe - Rauchentwicklung - Teil 2: Bestimmung der optischen Dichte durch
Einkammerprüfung (ISO 5659-2:2017)
Plastiques - Production de fumée - Partie 2: Détermination de la densité optique par un
essai en enceinte unique (ISO 5659-2:2017)
Ta slovenski standard je istoveten z: EN ISO 5659-2:2017
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 5659-2
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2017
EUROPÄISCHE NORM
ICS 13.220.40; 83.080.01 Supersedes EN ISO 5659-2:2012
English Version
Plastics - Smoke generation - Part 2: Determination of
optical density by a single-chamber test (ISO 5659-2:2017)
Plastiques - Production de fumée - Partie 2: Kunststoffe - Rauchentwicklung - Teil 2: Bestimmung
Détermination de la densité optique par un essai en der optischen Dichte durch Einkammerprüfung (ISO
enceinte unique (ISO 5659-2:2017) 5659-2:2017)
This European Standard was approved by CEN on 9 May 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5659-2:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 5659-2:2017) 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
NBN.
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 December 2017, and conflicting national standards
shall be withdrawn at the latest by December 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5659-2:2012.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5659-2:2017 has been approved by CEN as EN ISO 5659-2:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 5659-2
Fourth edition
2017-05
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 5659-2:2017(E)
©
ISO 2017
ISO 5659-2:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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the requester.
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copyright@iso.org
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ii © ISO 2017 – All rights reserved

ISO 5659-2:2017(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of the test . 3
5 Suitability of a material or product for testing . 3
5.1 Material or product geometry . 3
5.2 Surface characteristics . 3
5.3 Asymmetrical products . 3
6 Specimen construction and preparation. 4
6.1 Number of specimens . 4
6.2 Size of specimens . 4
6.3 Specimen preparation . 4
6.4 Conditioning . 5
6.5 Wrapping of specimens . 5
7 Apparatus and ancillary equipment . 5
7.1 General . 5
7.2 Test chamber . 6
7.2.1 Construction . 6
7.2.2 Chamber pressure control facilities . 6
7.2.3 Chamber wall temperature . 9
7.3 Specimen support and heating arrangements .10
7.3.1 Radiator cone .10
7.3.2 Framework for support of the radiator cone, specimen holder and heat
flux meter .10
7.3.3 Radiator shield.13
7.3.4 Heat flux meter .13
7.3.5 Specimen holder .14
7.3.6 Pilot burner .14
7.4 Gas supply .15
7.5 Photometric system .15
7.5.1 General.15
7.5.2 Light source .15
7.5.3 Photo detector .15
7.5.4 Additional equipment . .17
7.6 Chamber leakage .17
7.7 Cleaning materials .18
7.8 Ancillary equipment .18
7.8.1 Balance .18
7.8.2 Timing device .18
7.8.3 Linear measuring devices .18
7.8.4 Auxiliary heater .18
7.8.5 Protective equipment .18
7.8.6 Recorder .18
7.8.7 Water-circulating device .18
8 Test environment .18
9 Setting-up and calibration procedures .19
9.1 General .19
9.2 Alignment of photometric system .19
9.2.1 General.19
ISO 5659-2:2017(E)
9.2.2 Beam collimation .19
9.2.3 Beam focusing .19
9.3 Selection of compensating filter(s) .19
9.4 Linearity check .20
9.5 Calibration of range-extension filter .20
9.6 Chamber leakage rate test .21
9.7 Burner calibration .21
9.8 Radiator cone calibration.21
9.9 Cleaning .22
9.10 Frequency of checking and calibrating procedure .22
10 Test procedure .22
10.1 General .22
10.2 Preparation of test chamber .22
10.3 Tests with pilot flame .23
10.4 Preparation of the photometric system .23
10.5 Loading the specimen .23
10.6 Recording of light transmission .23
10.7 Observations .24
10.8 Termination of test .24
10.9 Testing in different modes .25
11 Expression of results .25
11.1 Specific optical density, D .25
s
11.2 Clear-beam correction factor, D .26
c
12 Precision .26
13 Test report .26
Annex A (normative) Calibration of heat flux meter .28
Annex B (informative) Variability in the specific optical density of smoke measured in the
single-chamber test .29
Annex C (informative) Determination of mass optical density .31
Annex D (informative) Precision data from tests on intumescent materials .36
Annex E (informative) Guidance on optical density testing .38
Annex F (informative) Specific sample preparation .46
Bibliography .49
iv © ISO 2017 – All rights reserved

ISO 5659-2:2017(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning
behaviour.
This fourth edition cancels and replaces the third edition (ISO 5659-2:2012), which has been technically
revised. It details several technical points for sampling (essentially Annex F) and harmonizes sample
preparation with other standards like ISO 5660-1.
A list of all parts in the ISO 5659 series can be found on the ISO website.
ISO 5659-2:2017(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 to (see also ISO/TS 3814
and ISO 13943).
A test such as is specified in this document 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 a visible suspension of solid and/or liquid particles in gases
resulting from incomplete combustion. 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 or other enclosure, such as a ship or train, 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.
vi © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 5659-2:2017(E)
Plastics — Smoke generation —
Part 2:
Determination of optical density by a single-chamber test
1 Scope
This document specifies a method of measuring smoke production from the exposed surface of
specimens of materials or composites. It is applicable to specimens that have an essentially flat surface
and do not exceed 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.
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 fire safety engineering in
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 can be generated by the materials upon exposure
to heat and flame under other (actual) exposure conditions. 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 (see Annex E).
It is emphasized that smoke production from a material varies according to the irradiance level to
which the specimen is exposed. The results yielded from the method specified in this document are
2 2
based on exposure to the specific irradiance levels of 25 kW/m and 50 kW/m .
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 13943, Fire safety — Vocabulary
ISO 14934-3, Fire tests — Calibration and use of heat flux meters — Part 3: Secondary calibration method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
ISO 5659-2:2017(E)
3.1
assembly
fabrication of materials (3.6) and/or composites (3.2)
Note 1 to entry: Sandwich panels are an example of an assembly.
Note 2 to entry: The assembly may include an air gap.
3.2
composite
combination of materials (3.6) which are generally recognized in building construction as discrete
entities
Note 1 to entry: Coated or laminated materials are examples of composites.
3.3
essentially flat surface
surface which does not deviate from a plane by more than 1 mm
3.4
exposed surface
surface of the product (3.9) 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
Note 1 to entry: Metal, stone, timber, concrete, mineral fibre and polymers are examples.
3.7
mass optical density
MOD
measure of the degree of opacity of smoke in terms of the mass loss of the material (3.6)
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 (3.6), composite (3.2) or assembly (3.1) 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 (3.9) of the exposed area of the specimen (3.11) and the path length of the light beam
Note 1 to entry: See 11.1.1.
3.11
specimen
representative piece of the product to be tested together with any substrate or surface coating
Note 1 to entry: The specimen may include an air gap.
2 © ISO 2017 – All rights reserved

ISO 5659-2:2017(E)
3.12
intumescent material
dimensionally unstable material (3.6), developing a carbonaceous expanded structure
Note 1 to entry: Generally, a material developing an expanded structure of thickness >10 mm during the test,
with the cone heater 25 mm from the specimen, is considered as intumescent material.
4 Principles of the test
Specimens of the product are mounted horizontally within a chamber and exposed to thermal radiation
on 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 or product for testing
5.1 Material or product geometry
5.1.1 The method is applicable to essentially flat materials, products, composites or 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 or product as tested.
5.1.3 It is not possible to calculate the specific optical density of one thickness of a material or product
from the specific optical density of another thickness of the material or product.
5.2 Surface characteristics
A material or product having one of the following properties is suitable for testing:
a) an essentially flat exposed surface;
b) a surface irregularity which is evenly distributed over the exposed surface provided that
1) at least 50 % of the surface of a representative 100 mm area lies within a depth of 10 mm from
a plane taken across the highest points on the exposed surface or
2) for surfaces containing cracks, fissures, or holes not exceeding 8 mm in width or 10 mm in
depth, the total area of such cracks, fissures, or holes at the surface does not exceed 30 % of a
representative 100 mm area of the exposed surface.
When an exposed surface does not meet the requirements of either 5.2 a) or 5.2 b), the material or
product shall be tested in a modified form complying as close as possible with the requirements given
in 5.2. The test report shall state that the material or product has been tested in a modified form and
clearly describe the modification.
5.3 Asymmetrical products
It is possible that a product submitted to this test will have faces which differ or contain laminations of
different materials arranged in a different order in relation to the two faces. If either of the faces can be
exposed in use within a room, cavity, or void, both faces shall be tested.
ISO 5659-2:2017(E)
6 Specimen construction and preparation
6.1 Number of specimens
6.1.1 The test sample shall comprise a minimum of 12 specimens if all four modes are to be tested: six
specimens shall be tested at 25 kW/m (three specimens with a pilot flame and 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 fewer than four modes are to be tested, a minimum of three specimens per mode shall be tested.
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 12 specimens (i.e. three specimens per test mode) shall be held in reserve if
required by the modes specified in 10.9.
6.1.4 In case of intumescent materials, it is necessary to make a preliminary test with the cone heater
at 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 25 mm nominal thickness 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.
6.3.4 This test method has been found suitable for applications outside the field of plastics, or to
transformed products in their end-use shape. Such specific sampling conditions are proposed in Annex F.
4 © ISO 2017 – All rights reserved

ISO 5659-2:2017(E)
6.4 Conditioning
6.4.1 Before the test, specimens shall be conditioned to constant mass at a temperature of (23 ± 2) °C
and a relative humidity of (50 ± 5) % in accordance with ISO 291.
Constant mass is considered to be 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 piece or 0,1 g, whichever is
the greater. Materials, such as polyamides, which require more than one week of conditioning to reach
equilibrium, may be tested after conditioning for a period specified by the sponsor. This period shall
not be less than one week and shall be described in the test report.
6.4.2 While in the conditioning chamber, specimens shall be supported in racks so that air has access
to all surfaces.
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.
6.5 Wrapping of specimens
6.5.1 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.
6.5.2 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
of low-density (nominal 65 kg/m ) refractory fibre blanket under the non-combustible board.
Wrapped specimens of thickness greater than 12,5 mm but less than 25 mm shall be backed with a
layer of low-density (nominal 65 kg/m ) refractory fibre blanket.
Wrapped specimens of a thickness of 25 mm shall be tested without any backing board or refractory
fibre blanket.
6.5.3 For resilient materials, each specimen in its aluminium foil wrapper shall be installed 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.
6.5.4 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.
7 Apparatus and ancillary equipment
7.1 General
The apparatus (see Figure 1) shall consist of an air-tight 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.
ISO 5659-2:2017(E)
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 capable of easy
cleaning. 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.
The door of the chamber shall occupy a complete side of the smoke chamber. A safety blow-out panel,
consisting of a sheet of 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.
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 (towards the top of the chamber) 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 connected to an extraction fan capable of creating a negative
pressure of at least 0,5 kPa (50 mm water gauge). The outlet of the fan should be connected to the
laboratory exhaust system, typically using flexible tubing with a diameter between 50 mm and 100 mm.
7.2.2 Chamber pressure control facilities
Provision shall be made for controlling the pressure inside the test chamber. A 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. The manometer can be either electronic or a suitable fluid in a tube
(water or an appropriate indicating fluid).
A suitable pressure regulator (see Figure 3) consists of a vented water-filled bottle and a length of
flexible tubing of diameter 25 mm, inserted 100 mm below the water surface: the other end of the tubing
is connected to the manometer and the chamber. The regulator shall be vented to the exhaust system.
6 © ISO 2017 – All rights reserved

ISO 5659-2:2017(E)
a) Schematic drawing of typical test apparatus
b) Typical example of test apparatus
Key
1 optical measurement system 8 pilot burner
2 pressure controller 9 specimen in specimen holder
3 optical path 10 weighing de
...