SIST EN ISO 4589-3:2017
(Main)Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated-temperature test (ISO 4589-3:2017)
Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated-temperature test (ISO 4589-3:2017)
ISO 4589-3:2017 specifies methods for determining the minimum volume fraction of oxygen, in a mixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over a range of temperatures between 25 °C and 150 °C. The range of temperatures is typically between 40 °C and 150 °C. The results are defined as temperature index values at the test temperature, which is typical of the practical temperature that a plastic material can experience in an overheated service situation.
Methods are provided for testing materials that are self-supporting at the test temperature in the form of vertical bars or sheet up to 10,5 mm thick. However, they are not applicable to form V which requires a supporting frame as defined in ISO 4589‑2:2017, Table 2. These methods are suitable for solid, laminated or cellular materials characterized by an apparent density 100 kg/m3 or higher. The methods are also applicable to some cellular materials having an apparent density of less than 100 kg/m3. A method is provided for testing flexible sheet or film materials while supported vertically.
ISO 4589-3:2017 also includes a method (see Annex A) for determining the temperature at which the OI of small vertical test specimens in air is 20,9 % under specified test conditions. The temperature at which this occurs is defined as the flammability temperature (FT) and the method is limited to the determination of temperatures less than 400 °C. The method is not applicable to materials having an OI of <20,9 %.
Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 3: Prüfung bei erhöhter Temperatur (ISO 4589-3:2017)
Dieser Teil von ISO 4589 legt die Verfahren zur Bestimmung des minimalen Volumenanteils an Sauerstoff im Gemisch mit Stickstoff fest, bei dem die Verbrennung kleiner Probekörper in senkrechter Lage unter festgelegten Prüfbedingungen in einem Temperaturbereich zwischen 25 °C und 150 °C aufrechterhalten wird. Der übliche Temperaturbereich liegt zwischen 40 °C und 150 °C. Die Ergebnisse sind als Temperaturindexwerte bei der Prüftemperatur definiert, die für die Temperatur charakteristisch ist, der Kunststoffmaterialien in der Praxis bei Übertemperatur ausgesetzt sein können.
Es werden Verfahren zur Prüfung von Werkstoffen angegeben, die als senkrechte Stäbe oder Platten einer Dicke bis zu 10,5 mm bei der Prüftemperatur selbsttragend sind. Sie sind jedoch nicht auf Probekörper der Form V anwendbar, die einen Auflagerrahmen, wie in Tabelle 2 von Teil 2 festgelegt, erfordern. Diese Verfahren sind für feste und laminierte Werkstoffe oder für Schaumstoffe mit einer Schütt und Stopfdichte von 100 kg/m3 oder höher geeignet. Die Verfahren dürfen auch auf einige Schaumstoffe mit einer Schütt und Stopfdichte unter 100 kg/m3 angewendet werden. Es wird ein Verfahren zur Prüfung senkrecht gehaltener flexibler Platten oder Folienwerkstoffe beschrieben.
Dieser Teil von ISO 4589 enthält auch ein Verfahren (siehe Anhang A) zur Bestimmung der Temperatur, bei der kleine senkrecht angeordnete Probekörper in Luft unter festgelegten Prüfbedingungen einen Sauerstoff-Index von 20,9 % aufweisen. Die Temperatur, bei der das eintritt, ist als Entflammbarkeitstemperatur (FT) definiert, und das Verfahren ist auf die Bestimmung von Temperaturen unter 400 °C beschränkt. Das Verfahren ist auf Werkstoffe nicht anwendbar, deren Sauerstoff-Index < 20,9 % ist.
Die in Übereinstimmung mit diesem Teil von ISO 4589 erzielten Ergebnisse sind nicht dafür anwendbar, um die Brandgefahr zu beschreiben oder abzuschätzen, die ein bestimmter Werkstoff oder eine bestimmte Formgebung bei einem tatsächlichen Brand darstellt, es sei denn, sie werden nur als Teil einer Brand-risikobewertung verwendet, die alle für die Bewertung der Brandgefahr bei einer bestimmten Werkstoffanwendung sachdienlichen Faktoren in Betracht zieht.
ANMERKUNG 1 Diese Verfahren sind unter Umständen auf Werkstoffe mit großem Schrumpf bei Erwärmung, z. B. stark gereckte dünne Folien, nicht zufriedenstellend anwendbar.
ANMERKUNG 2 Zur Bewertung der Brandfortleitungseigenschaften von Schaumstoffen mit einer Dichte < 100 kg/m3 wird auf das Verfahren in ISO 3582:2000, Flexible cellular polymeric materials — Laboratory assessment of horizontal burning characteristics of small specimens subjected to a small flame, verwiesen.
Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène - Partie 3: Essai à haute température (ISO 4589-3:2017)
ISO 4589-3:2017 spécifie des méthodes pour la détermination de la fraction volumique minimale d'oxygène, dans un mélange oxygène/azote, qui permet d'entretenir la combustion de petites éprouvettes verticales dans des conditions d'essai spécifiées dans une gamme de températures comprises entre 25 °C et 150 °C. La gamme de températures est généralement comprise entre 40 °C et 150 °C. Les résultats sont définis en tant que valeurs de l'indice de température à la température d'essai, laquelle est caractéristique de la température à laquelle un matériau plastique est susceptible d'être soumis dans des conditions d'utilisation avec surchauffe.
Les méthodes sont définies pour les essais de matériaux rigides, à la température d'essai, sous la forme de barreaux verticaux ou de feuilles ayant une épaisseur maximale de 10,5 mm. Cependant, ces méthodes ne s'appliquent pas au type V qui nécessitent un châssis comme défini dans l'ISO 4589‑2:2017, Tableau 2. Ces méthodes sont utilisables avec les matériaux compacts, stratifiés ou alvéolaires ayant une masse volumique apparente égale ou supérieure à 100 kg/m3. Ces méthodes sont également applicables à certains matériaux alvéolaires ayant une masse volumique apparente inférieure à 100 kg/m3. Une méthode comportant un support vertical est également prévue pour les films et feuilles souples.
ISO 4589-3:2017 inclut également une méthode (voir Annexe A) pour la détermination de la température à laquelle l'indice d'oxygène de petites éprouvettes verticales est de 20,9 % dans l'air, dans des conditions d'essai spécifiées. La température à laquelle cela se produit est définie en tant que température d'inflammabilité (FT) et la méthode décrite permet uniquement l'obtention de températures inférieures à 400 °C. Cette méthode n'est pas applicable aux matériaux ayant un indice d'oxygène ≤20,9 %.
Polimerni materiali - Določanje gorljivosti s kisikovim indeksom - 3. del: Preskus pri zvišani temperaturi (ISO 4589-3:2017)
Ta dokument opisuje metodo za določanje najmanjšega prostorninskega deleža kisika v mešanici in z dušikom, namenjeni za podporo pri zgorevanju majhnih navpičnih preskušancev pri
določenih preskusnih pogojih. Rezultati so opredeljeni kot vrednosti kisikovega indeksa.
Zagotovljene so metode za preskušanje samonosnih materialov v obliki navpičnih palic ali plošč debeline do 10,5 mm. Te metode so primerne za trdne, laminirane ali penjene materiale, za katere je značilna gostota 100 kg/m3 ali več. Metode se lahko uporabijo tudi pri nekaterih penjenih materialih z gostoto manj kot 100 kg/m3. Metoda je zagotovljena za preskušanje prožnih plošč ali tankoslojnih materialov, ki so navpično podprti.
Za primerjavo je zagotovljen postopek za določanje, ali je kisikov indeks materiala
nad neko določeno minimalno vrednostjo.
OPOMBA: Teh metod morda ne bo mogoče uporabiti v zadovoljivi meri pri materialih, ki se zaradi segrevanja močno krčijo, npr. tanek film.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4589-3:2017
01-julij-2017
1DGRPHãþD
SIST EN ISO 4589-3:1999
3ROLPHUQLPDWHULDOL'RORþDQMHJRUOMLYRVWLVNLVLNRYLPLQGHNVRPGHO 3UHVNXV
SUL]YLãDQLWHPSHUDWXUL ,62
Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated-
temperature test (ISO 4589-3:2017)
Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 3:
Prüfung bei erhöhter Temperatur (ISO 4589-3:2017)
Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène -
Partie 3: Essai à haute température (ISO 4589-3:2017)
Ta slovenski standard je istoveten z: EN ISO 4589-3:2017
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
SIST EN ISO 4589-3:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4589-3:2017
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SIST EN ISO 4589-3:2017
EN ISO 4589-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 13.220.40; 83.080.01 Supersedes EN ISO 4589-3:1996
English Version
Plastics - Determination of burning behaviour by oxygen
index - Part 3: Elevated-temperature test (ISO 4589-
3:2017)
Plastiques - Détermination du comportement au feu au Kunststoffe - Bestimmung des Brennverhaltens durch
moyen de l'indice d'oxygène - Partie 3: Essai à haute den Sauerstoff-Index - Teil 3: Prüfung bei erhöhter
température (ISO 4589-3:2017) Temperatur (ISO 4589-3:2017)
This European Standard was approved by CEN on 20 March 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 4589-3:2017 E
worldwide for CEN national Members.
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SIST EN ISO 4589-3:2017
EN ISO 4589-3:2017 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 4589-3:2017
EN ISO 4589-3:2017 (E)
European foreword
This document (EN ISO 4589-3:2017) 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 November 2017 and conflicting national standards
shall be withdrawn at the latest by November 2017.
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.
This document supersedes EN ISO 4589-3:1996.
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 4589-3:2017 has been approved by CEN as EN ISO 4589-3:2017 without any
modification.
3
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SIST EN ISO 4589-3:2017
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SIST EN ISO 4589-3:2017
INTERNATIONAL ISO
STANDARD 4589-3
Second edition
2017-04
Plastics — Determination of burning
behaviour by oxygen index —
Part 3:
Elevated-temperature test
Plastiques — Détermination du comportement au feu au moyen de
l’indice d’oxygène —
Partie 3: Essai à haute température
Reference number
ISO 4589-3:2017(E)
©
ISO 2017
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Arrangement . 2
5.2 Test chimney . 2
5.3 Test specimen holder. 3
5.4 Gas supplies . 3
5.5 Gas control devices . 3
5.6 Oxygen analyser . 3
5.7 Flame igniter . 4
5.8 Timing device . 4
5.9 Fume extraction system . 4
6 Calibration and maintenance of equipment . 4
7 Preparation of test specimens . 4
7.1 Sampling . 4
7.2 Test specimen dimensions and preparation . 4
7.3 Marking of test pieces . 4
7.4 Conditioning . 4
8 Procedure. 5
8.1 Setting up the apparatus and test specimen . 5
8.2 Igniting the test specimen . 5
8.3 Assessing burning behaviour . 5
8.4 Selecting successive volume fractions of oxygen . 5
8.5 Determining the preliminary volume fraction of oxygen . 5
8.6 Volume fraction of oxygen changes . 6
9 Calculations and expression of results . 6
10 Comparison with a specified minimum value of the temperature index at a
specified temperature (short procedure) . 6
11 Precision . 6
12 Test report . 6
Annex A (normative) Measurement of flammability temperature (FT).12
Annex B (informative) Interlaboratory test data on flammability temperature .15
Annex C (informative) Typical test results sheet .16
Bibliography .19
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(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 second edition cancels and replaces the first edition (ISO 4589-3:1996), which has been technically
revised.
A list of all parts in the ISO 4589 series can be found on the ISO website.
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
Introduction
This document has been prepared to extend the methods available for the determination of flammability
by oxygen index (OI) (see ISO 4589-2) to typical elevated temperatures to which a plastic material can
be exposed in a service situation. It also provides a method for determining the temperature at which
combustion of a small bar of material is just supported in air under certain test conditions; the resulting
temperature is termed the flammability temperature.
This document is intended to be used in conjunction with ISO 4589-2 which describes the basic OI
test method.
Results obtained in accordance with this document are not applicable to describe or appraise the fire
hazard presented by a particular material or shape under actual fire conditions, unless used as one
element of a fire risk assessment which takes into account all of the factors which are pertinent to the
assessment of the fire hazard of a particular application for the material.
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SIST EN ISO 4589-3:2017
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SIST EN ISO 4589-3:2017
INTERNATIONAL STANDARD ISO 4589-3:2017(E)
Plastics — Determination of burning behaviour by
oxygen index —
Part 3:
Elevated-temperature test
1 Scope
This document specifies methods for determining the minimum volume fraction of oxygen, in a
mixture with nitrogen, that will support combustion of small vertical test specimens under specified
test conditions over a range of temperatures between 25 °C and 150 °C. The range of temperatures is
typically between 40 °C and 150 °C. The results are defined as temperature index values at the test
temperature, which is typical of the practical temperature that a plastic material can experience in an
overheated service situation.
Methods are provided for testing materials that are self-supporting at the test temperature in the form
of vertical bars or sheet up to 10,5 mm thick. However, they are not applicable to form V which requires a
supporting frame as defined in ISO 4589-2:2017, Table 2. These methods are suitable for solid, laminated
3
or cellular materials characterized by an apparent density 100 kg/m or higher. The methods are also
3
applicable to some cellular materials having an apparent density of less than 100 kg/m . A method is
provided for testing flexible sheet or film materials while supported vertically.
This document also includes a method (see Annex A) for determining the temperature at which the
OI of small vertical test specimens in air is 20,9 % under specified test conditions. The temperature
at which this occurs is defined as the flammability temperature (FT) and the method is limited to the
determination of temperatures less than 400 °C. The method is not applicable to materials having an OI
of <20,9 %.
NOTE 1 It might not be possible to apply these methods satisfactorily to materials that exhibit high levels of
shrinkage when heated, e.g. highly oriented thin film.
3
NOTE 2 For assessing the flame propagation properties of cellular materials of density <100 kg/m , attention
is drawn to the method described in ISO 3582.
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 4589-1, Plastics — Determination of burning behaviour by oxygen index — Part 1: General requirements
ISO 4589-2:2017, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-
temperature test
ISO 13943, Fire safety — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4589-1, ISO 13943 and the
following apply.
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
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
3.1
flammability temperature
FT
temperature at which flaming combustion of a material is supported in air that has a volume fraction of
oxygen of 20,9 %
3.2
temperature index
TI
minimum volume fraction of oxygen, in a mixture of oxygen and nitrogen, at a test temperature that
supports flaming combustion of a material under specified test conditions
Note 1 to entry: The test temperature will typically be between 40 °C and 150 °C.
3.3
ignition
DEPRECATED: sustained ignition
〈flaming combustion〉 initiation of sustained flame
[SOURCE: ISO 13943:2008, 4.188]
4 Principle
A small test specimen is supported vertically in a mixture of oxygen and nitrogen flowing upwards
through a transparent heated chimney. The upper end of the specimen is ignited, and the subsequent
burning behaviour of the specimen is observed to compare the period for which burning continues, or
the length of specimen burnt with specified limits for such burning. By testing a series of specimens
in different volume fractions of oxygen, the minimum volume fraction of oxygen is estimated. General
requirements for the apparatus and test method are given in ISO 4589-1.
5 Apparatus
5.1 Arrangement
The apparatus specified in 5.2 to 5.6 shall be arranged as indicated in Figures 1 to 4, as appropriate.
5.2 Test chimney
The test chimney shall consist of two concentric heat-resistant glass tubes supported vertically between
an insulating top plate and a base through which oxygen-containing gas mixtures can be introduced.
The chimney is provided with a heating element suitable for use in conjunction with a preheater for
heating the incoming gas mixture. This is to maintain the test atmosphere within the inner tube in the
vicinity of the test specimen at within ± 3 °C of any specific test temperature up to, and including 125 °C
and at within ± 5 °C of any higher test temperature at which the equipment is intended to be used. The
heating element shall not impede adequate observation of a test specimen under test.
The preferred dimensions of the inner tube are 450 mm to 500 mm minimum height, and 75 mm to
100 mm diameter cylindrical bore. The upper outlet should preferably be restricted as necessary by an
overhead cap having an outlet small enough to produce an exhaust velocity of at least 90 mm/s at 23 °C
± 2 °C from a flow rate within the chimney of 40 mm/s at 23 °C ± 2 °C (see Note). The height of the outer
tube should be similar to that of the inner tube, and the radial clearance between the inner and outer
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
tubes should be between 5 mm and 10 mm. Chimneys of other dimensions, with or without restricted
outlets, may be used if shown to give equivalent results.
The bottom of the chimney, or the base upon which the chimney is supported, shall incorporate a means
for distributing evenly the gas mixture entering the inner tube. A satisfactory means comprises beads
of diameter between 3 mm and 5 mm in a layer between 80 mm and 100 mm deep. Other devices, such
as radial manifolds, may be used if shown to give equivalent results.
A porous screen may be mounted below the level of the test piece holder to prevent falling combustion
debris from fouling the gas entry and distribution paths.
The chimney support may incorporate a levelling device and indicator to facilitate vertical alignment
of the chimney, and a test piece supported therein. A dark background may be provided to facilitate
observation of flames within the chimney.
NOTE For inner tubes of diameter 75 mm to 100 mm, a cap converging to an outlet of diameter 40 mm at a
level at least 10 mm above the top of the cylindrical chimney is satisfactory. For such tubes also, an electrical-
resistance heating element dissipating up to about 1 000 W and helically wound around the outer surface of
the tube with a graded distribution of winding pitch so that the temperature is evenly distributed is suitable in
conjunction with a preheater comprising a cylindrical ceramic body with longitudinal holes and containing a
heating element dissipating up to about 1 000 W with regulating controls which can be operated separately from
those of the heater windings on the chimney tube. If the target test condition is 150 °C or less, a preheater is not
necessary; apparatus of more simple structure can be used.
5.3 Test specimen holder
The test specimen holder specified in ISO 4589-2:2017, 5.2 shall be used.
The transfer device (see Figure 4) can be used for moving a specimen loaded specimen holder into the
test chimney.
5.4 Gas supplies
The gas supplies specified in ISO 4589-2:2017, 5.3 shall be used.
Because damage can occur to the chimney heater and preheater if energized while no gas flows through
them, it is recommended that a gas-flow or pressure-sensing device is incorporated in the gas supply
lines and is coupled to the heater power-control circuits.
To economize purified oxygen and nitrogen, it is recommended that an air pump is provided to supply
air instead of oxygen and/or nitrogen, at the appropriate flow rate, during periods when specimens are
not being tested.
5.5 Gas control devices
The gas supplies specified in ISO 4589-2:2017, 5.4 shall be used, except that the flow rate shall be
40 mm/s ± 0,8 mm/s at 23 °C.
A thermocouple (see Figure 1, Key 9) shall be provided for checking or ensuring that the temperature of
the gas mixture in the chimney is in accordance with 5.2. If this involves an internal probe, its position
and profile shall be designed to minimize induction of turbulence within the chimney.
NOTE Systems of measurement and control that have proved satisfactory are listed in ISO 4589-2:2017, 5.4.
5.6 Oxygen analyser
The oxygen analyser specified in ISO 4589-2:2017, 5.5 shall be used.
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
5.7 Flame igniter
The flame igniter specified in ISO 4589-2:2017, 5.6 shall be used.
5.8 Timing device
The timing device specified in ISO 4589-2:2017, 5.7 shall be used.
5.9 Fume extraction system
The fume extraction system specified in ISO 4589-2:2017, 5.8 shall be used.
6 Calibration and maintenance of equipment
Calibrate and maintain the equipment periodically in accordance with the instructions given in
ISO 4589-2:2017, Annex A so that the maximum interval between recalibration and use conforms to the
periods stated in ISO 4589-2:2017, Table 1, except that the accuracy of checking the flow rate shall be ±
0,8 mm/s.
7 Preparation of test specimens
7.1 Sampling
Sampling shall be in accordance with ISO 4589-2:2017, 7.1.
For the flammability temperature procedure (see Annex A), at least 10 test specimens shall be provided.
If a test specimen is not self-supporting at the temperature of the test, it shall be provided with external
support by the use of a 0,55 mm ± 0,05 mm diameter nickel-chromium alloy wire with a maximum
working temperature of 1 100 °C, and secured by ties of copper wire of 0,20 mm ± 0,02 mm diameter.
These shall be positioned as shown in Figure 5. See Annex B for round-robin analysis of the effects of
variation of the test specimen holder.
Another practice is to support the test piece between two capillary glass tubes, the assembly being
lightly bound together with a single tie of fine nichrome or stainless-steel wire (nominally 200 μm
gauge), and held in a small standard clamp. This non-standard practice should be used carefully and
recorded in the test report.
7.2 Test specimen dimensions and preparation
With the exception of form V, test specimen dimensions shall conform to, and specimen preparation
shall be in accordance with, ISO 4589-2:2017, 7.2.
7.3 Marking of test pieces
Marking of the test specimens shall be in accordance with ISO 4589-2:2017, 7.3.
7.4 Conditioning
Conditioning shall be in accordance with ISO 4589-2:2017, 7.4.
4 © ISO 2017 – All rights reserved
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SIST EN ISO 4589-3:2017
ISO 4589-3:2017(E)
8 Procedure
8.1 Setting up the apparatus and test specimen
8.1.1 Position a temperature sensor in the position to be occupied by the top of a test specimen.
Adjust the electrical power to the chimney heater and preheater to give the test temperature, with the
gas controls set to give a gas velocity within the chimney of 40 mm/s ± 0,8 mm/s at 23 °C. The flow rate
shall be estimated by using the formula found in ISO 4589-2:2017, A.2.
8.1.2 Select an initial volume fraction of oxygen to be used. When possible, base this on experience
of results for similar materials. Alternatively, try to ignite a test specimen in the chimney supplied with
mixed gas and heated to the test temperature, and note the burning behaviour. If the specimen burns
rapidly, select an initial volume fraction of about 18 % of oxygen; if the test specimen burns gently or
unsteadily, select an initial oxygen volume fraction of about 21 %; if the specimen does not continue to
burn in air, select an initial volume fraction of at least 25 %, depending upon the difficulty of ignition or
the period of burning before extinguishing in air.
8.1.3 When the temperature in the test chimney is stable and in accordance with the limits given in
5.2,
...
SLOVENSKI STANDARD
oSIST prEN ISO 4589-3:2016
01-april-2016
3ROLPHUQLPDWHULDOL'RORþDQMHJRUOMLYRVWLVNLVLNRYLPLQGHNVRPGHO 3UHVNXV
SUL]YLãDQLWHPSHUDWXUL ,62',6
Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated-
temperature test (ISO/DIS 4589-3:2016)
Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 3:
Prüfung bei erhöhter Temperatur (ISO/DIS 4589-3:2016)
Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène -
Partie 3: Essai à haute température (ISO/DIS 4589-3:2016)
Ta slovenski standard je istoveten z: prEN ISO 4589-3
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
oSIST prEN ISO 4589-3:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 4589-3:2016
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oSIST prEN ISO 4589-3:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4589-3
ISO/TC 61/SC 4 Secretariat: BSI
Voting terminates on:
Voting begins on:
2016-02-18 2016-05-18
Plastics — Determination of burning behaviour by
oxygen index —
Part 3:
Elevated-temperature test
Plastiques — Détermination du comportement au feu au moyen de l’indice d’oxygène —
Partie 3: Essai à haute température
ICS: 13.220.40; 83.080.01
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4589-3:2016(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2016
---------------------- Page: 3 ----------------------
oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3:2016(E) © ISO 2015 – All rights reserved
ISO TC 61/SC 4
Date: 2015-12-09
ISO/DIS 4589-3
ISO TC 61/SC 4/WG 8
Secretariat: BSI
Plastics — Determination of burning behaviour by oxygen index —
Part 3: Elevated-temperature test
Plastiques — Détermination du comportement au feu au moyen de l'indice d'oxygène — Partie 3: Partie 3:
Essai à haute température
Warning
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to
change without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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ii © ISO 2016 – All rights reserved
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
1 Contents Page
2 Foreword . iv
3 Introduction . v
4 1 Scope . 1
5 2 Normative reference . 1
6 3 Definitions . 2
7 4 Principle . 2
8 5 Apparatus . 2
9 5.1 Arrangement . 2
10 5.2 Test chimney . 3
11 5.3 Test specimen holder. 3
12 5.4 Gas supplies . 3
13 5.5 Gas control devices . 4
14 5.6 Oxygen analyser . 4
15 5.7 Flame igniter . 4
16 5.8 Timing device . 4
17 5.9 Fume extraction system . 4
18 6 Calibration and maintenance of equipment . 4
19 7 Preparation of test specimens . 4
20 7.1 Sampling . 4
21 7.2 Test specimen dimensions and preparation . 4
22 7.3 Marking of test pieces . 5
23 7.4 Conditioning . 5
24 8 Procedure . 5
25 8.1 Setting up the apparatus and test specimen . 5
26 8.2 Igniting the test specimen . 5
27 8.3 Assessing burning behaviour . 5
28 8.4 Selecting successive volume fractions of oxygen . 5
29 8.5 Determining the preliminary volume fraction of oxygen. 6
30 8.6 Volume fraction of oxygen changes . 6
31 9 Calculations and expression of results . 6
32 10 Comparison with a specified minimum value of the oxygen index at a specified
33 temperature (short procedure) . 6
34 11 Precision . 6
35 12 Test report . 6
36 Annex A (normative) Measurement of flammability temperature (FT) . 13
37 A.1 Setting up the apparatus . 13
38 A.2 Igniting the test specimen . 14
39 A.3 Assessing burning behaviour . 14
40 A.4 Selecting successive test temperatures . 14
41 A.5 Determining flammability temperature. 14
42 A.6 Test report . 14
43 Annex B (informative) Interlaboratory test data on flammability temperature . 16
44 Annex C (informative) Typical test results sheet . 17
45
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
46 Foreword
47 ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
48 (ISO member bodies). The work of preparing International Standards is normally carried out through ISO
49 technical committees. Each member body interested in a subject for which a technical committee has been
50 established has the right to be represented on that committee. International organizations, governmental and
51 non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
52 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
53 International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
54 The main task of technical committees is to prepare International Standards. Draft International Standards
55 adopted by the technical committees are circulated to the member bodies for voting. Publication as an
56 International Standard requires approval by at least 75 % of the member bodies casting a vote.
57 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
58 rights. ISO shall not be held responsible for identifying any or all such patent rights.
59 ISO 4589-3 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning
60 behaviour.
61 This second edition cancels and replaces the first edition (ISO 4589-3:1996), which has been technically
62 revised.
63 ISO 4589 consists of the following parts, under the general title Plastics — Determination of burning behaviour
64 by oxygen index:
65 Part 1: Guidance:
66 Part 2: Ambient-temperature test
67 Part 3: Elevated-temperature test
iv © ISO 2015 – All rights reserved
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
68 Introduction
69 This part of ISO 4589 has been prepared to extend the methods available for the determination of flammability
70 by oxygen index (see ISO 4589-2) to typical elevated temperatures to which a plastic material can be exposed
71 in a service situation. It also provides a method for determining the temperature at which combustion of a
72 small bar of material is just supported in air under certain test conditions; the resulting temperature is termed
73 the flammability temperature.
74 This part of ISO 4589 is intended to be used in conjunction with ISO 4589-2 which describes the basic oxygen
75 index test method.
76
© ISO 2015 – All rights reserved v
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oSIST prEN ISO 4589-3:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4589-3
77 Plastics — Determination of burning behaviour by oxygen
78 index — Part 3: Elevated-temperature test
79 1 Scope
80 This part of ISO 4589 specifies methods for determining the minimum volume fraction of oxygen, in a mixture
81 with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over
82 a range of temperatures between 25 °C and 150 °C. The range of temperatures is typically between 40 °C
83 and 150 °C. The results are defined as temperature index values at the test temperature, which is typical of
84 the practical temperature that a plastic material may experience in an overheated service situation.
85 Methods are provided for testing materials that are self-supporting at the test temperature in the form of
86 vertical bars or sheet up to 10,5 mm thick. However, they are not applicable to form V which requires
87 supporting frame as defined in Table 2 of Part 2. These methods are suitable for solid, laminated or cellular
3
88 materials characterized by an apparent density 100 kg/m or greater. The methods may also be applicable to
3
89 some cellular materials having an apparent density of less than 100 kg/m . A method is provided for testing
90 flexible sheet or film materials while supported vertically.
91 This part of ISO 4589 also includes a method (see Annex A) for determining the temperature at which the
92 oxygen index of small vertical test specimens in air is 20,9 % under specified test conditions. The temperature
93 at which this occurs is defined as the flammability temperature (FT) and the method is limited to the
94 determination of temperatures less than 400 °C. The method is not applicable to materials having an oxygen
95 index of < 20,9 %.
96 Results obtained in accordance with this part of ISO 4589 is not applicable to describe or appraise the fire
97 hazard presented by a particular material or shape under actual fire conditions, unless used as one element of
98 a fire risk assessment which takes into account all of the factors which are pertinent to the assessment of the
99 fire hazard of a particular application for the material.
100 NOTE 1 It may not be possible to apply these methods satisfactorily to materials that exhibit high levels of shrinkage
101 when heated, e.g. highly oriented thin film.
3
102 NOTE 2 For assessing the flame propagation properties of cellular materials of density < 100 kg/m , attention is drawn
103 to the method of ISO 3582:2000, Flexible cellular polymeric materials Laboratory assessment of horizontal burning
104 characteristics of small specimens subjected to a small flame.
105 2 Normative reference
106 The following referenced documents are indispensable for the application of this document. For dated
107 references, only the edition cited applies. For undated references, the latest edition of the referenced
108 document (including any amendments) applies.
109 ISO 4589-1, Plastics Determination of burning behaviour by oxygen index Part 1: Guidance.
110 ISO 4589-2, Plastics Determination of burning behaviour by oxygen index Part 2: Ambient-temperature
111 test.
112 ISO 13943, Fire safety Vocabulary.
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ISO/DIS 4589-3
113 3 Definitions
114 For the purposes of this part of ISO 4589, the following definitions apply, as well as those from ISO 13943,
115 two of which are reproduced below for the convenience of the reader.
116 3.1
117 flammability temperature
118 FT
119 The temperature at which flaming combustion of a material is supported in air that has a volume fraction of
120 oxygen of 20,9 %.
121 3.2
122 temperature index
123 TI
124 The minimum volume fraction of oxygen, in a mixture of oxygen and nitrogen, at an agreed test temperature
125 that will just support flaming combustion of a material under specified test conditions.
o o
126 NOTE The agreed test temperature will typically be between 40 C and 150 C.
127 3.3
128 oxygen index
129 OI
130 limiting oxygen index
131 LOI
132 minimum volume fraction of oxygen in a mixture of oxygen and nitrogen, at 23 °C ± 2 °C, that just supports
133 flaming combustion of a material under specified test conditions
134 NOTE It is usually expressed as a percentage.
135 [SOURCE: ISO 13943:2008, 4.248]
136 3.4
137 ignition
138 sustained ignition (deprecated)
139 〈flaming combustion〉 initiation of sustained flame
140 [SOURCE: ISO 13943:2008, 4.188]
141 4 Principle
142 A small test specimen is supported vertically in a mixture of oxygen and nitrogen flowing upwards through a
143 transparent heated chimney. The upper end of the specimen is ignited and the subsequent burning behaviour
144 of the specimen is observed to compare the period for which burning continues, or the length of specimen
145 burnt, with specified limits for such burning. By testing a series of specimens in different volume fractions of
146 oxygen, the minimum volume fraction of oxygen is estimated. Guidance cocerning the apparatus and test
147 method is given in ISO 4589-1.
148 5 Apparatus
149 5.1 Arrangement
150 The apparatus specified in 5.2 to 5.6 shall be arranged as indicated by the diagrams in figures 1 to 3, as
151 appropriate.
2 © ISO 2015 – All rights reserved
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
152 5.2 Test chimney
153 The test chimney shall consist of two concentric heat-resistant glass tubes supported vertically between an
154 insulating top plate and a base through which oxygen-containing gas mixtures can be introduced. The
155 chimney is provided with a heating element suitable for use, in conjunction with a preheater for heating the
156 incoming gas mixture, to maintain the test atmosphere within the inner tube in the vicinity of the test specimen
157 at within ± 3 °C of any specific test temperature up to and including 125 °C and at within ± 5 °C of any higher
158 test temperature at which the equipment is intended to be used. The heating element shall not impede
159 adequate observation of a test specimen under test. If the same performance can be achieved, a chimney of
160 other structure can also be used.
161 The preferred dimensions of the inner tube are 450-500 mm minimum height and 75 mm to 100 mm diameter
162 cylindrical bore. The upper outlet should preferably be restricted as necessary by an overhead cap having an
163 outlet small enough to produce an exhaust velocity of at least 90 mm/s at 23 °C ± 2 °C from a flow rate within
164 the chimney of 40 mm/s at 23 °C ± 2 °C (see NOTE). The height of the outer tube should be similar to that of
165 the inner tube and the radial clearance between the inner and outer tubes should be between 5 mm and 10
166 mm. Chimneys of other dimensions, with or without restricted outlets, may be used, if shown to give
167 equivalent results.
168 The bottom of the chimney, or the base upon which the chimney is supported, shall incorporate a means for
169 distributing evenly the gas mixture entering the inner tube. A satisfactory means comprises beads of diameter
170 between 3 mm and 5 mm, in a layer between 80 mm and 100 mm deep. Other devices, such as radial
171 manifolds, may be used, if shown to give equivalent results.
172 A porous screen may be mounted below the level of the test piece holder, to prevent falling combustion debris
173 from fouling the gas entry and distribution paths.
174 The chimney support may incorporate a levelling device and indicator, to facilitate vertical alignment of the
175 chimney and a test piece supported therein. A dark background may be provided, to facilitate observation of
176 flames within the chimney.
177 NOTE For inner tubes of diameter 75 mm to 100 mm, a cap converging to an outlet of diameter 40 mm at a level at
178 least 10 mm above the top of the cylindrical chimney has been found satisfactory. For such tubes also, an electrical-
179 resistance heating element dissipating up to about 1 000 W and helically wound about the outer surface of the tube with a
180 graded distribution of winding pitch (the windings wrap the windings so that the temperature is evenly distributed) has
181 been found suitable in conjunction with a preheater comprising a cylindrical ceramic body with longitudinal holes and
182 containing a heating element dissipating up to about 1 000 W with regulating controls which can be operated separately
183 from those of the heater windings on the chimney tube. If the target test condition is 150 °C or less, a preheater is not
184 necessary, Apparatus of more simple structure can be used.
185 5.3 Test specimen holder
186 The test specimen holder specified in clause 5.2 of ISO 4589-2 shall be used.
187 The holder may have a complementary tool of any suitable shape (see Figure 4) for moving a specimen or
188 loaded specimen holder into or out of the test chimney.
189 5.4 Gas supplies
190 The gas supplies specified in clause 5.3 of ISO 4589-2 shall be used.
191 NOTE 1 Because damage may occur to the chimney heater and preheater if energized while no gas flows through
192 them, it is recommended that a gas-flow or pressure-sensing device is incorporated in the gas supply lines and is coupled
193 to the heater power-control circuits.
194 NOTE 2 To economize purified oxygen and nitrogen, it is recommended that an air pump is provided to supply air
195 instead of oxygen and/or nitrogen, at the appropriate flow rate, during periods when specimens are not being tested.
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
196 5.5 Gas control devices
197 The gas supplies specified in clause 5.4 of ISO 4589-2 shall be used, except that the flow rate shall be 40
198 mm/s ± 0,8 mm/s at 23 °C.
199 Means shall be provided for checking or ensuring that the temperature of the gas mixture in the chimney is in
200 accordance with 5.2. If this involves an internal probe, its position and profile shall be designed to minimize
201 induction of turbulence within the chimney.
202 NOTE Systems of measurement and control that have proved satisfactory are listed in 5.4 of ISO 4589-2.
203 5.6 Oxygen analyser
204 The oxygen analyser specified in clause 5.5 of ISO 4589-2 shall be used.
205 5.7 Flame igniter
206 The flame igniter specified in clause 5.6 of ISO 4589-2 shall be used.
207 5.8 Timing device
208 The timing device specified in clause 5.7 of ISO 4589-2 shall be used.
209 5.9 Fume extraction system
210 The fume extraction system specified in clause 5.8 of ISO 4589-2 shall be used.
211 6 Calibration and maintenance of equipment
212 Calibrate and maintain the equipment periodically in accordance with the instructions given in Annex A of ISO
213 4589-2 so that the maximum interval between recalibration and use conforms to the periods stated in Table 1
214 of ISO 4589-2, except that the accuracy of checking the flow rate shall be ± 0,8 mm/s.
215 7 Preparation of test specimens
216 7.1 Sampling
217 Sampling shall be in accordance with 7.1 of ISO 4589-2.
218 For the flammability temperature procedure (see Annex A), at least 10 test specimens shall be provided. If a
219 test specimen is not self-supporting at the temperature of the test, it shall be provided with external support by
220 the use of 0,55 mm ± 0,05 mm diameter nickel-chromium alloy wire with a maximum working temperature of
221 1100 °C and secured by ties of copper wire of 0,20 mm ± 0,02 mm diameter. These shall be positioned as
222 shown in Figure 5. See Annex B for round-robin analysis of the effects of variation of the test specimen holder.
223 Another practice is to support the test piece between two capillary glass tubes, the assembly being lightly
224 bound together with a single tie of fine nichrome or stainless-steel wire (nominally 200 μm gauge) and held in
225 a small standard clamp. This non-standard practice should be used carefully and recorded in the test report.
226 7.2 Test specimen dimensions and preparation
227 With the exception of form V, test specimen dimensions shall conform to, and specimen preparation shall be
228 in accordance with, 7.2 of ISO 4589-2.
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ISO/DIS 4589-3
229 7.3 Marking of test pieces
230 Marking of the test specimens shall be in accordance with 7.3 of ISO 4589-2.
231 7.4 Conditioning
232 Conditioning shall be in accordance with 7.4 of ISO 4589-2.
233 8 Procedure
234 8.1 Setting up the apparatus and test specimen
235 8.1.1 Position a temperature sensor in the position to be occupied by the top of a test specimen.
236 Adjust the electrical power to the chimney heater and preheater to give the test temperature, with the gas
237 controls set to give a gas velocity within the chimney of 40 mm/s ± 0,8 mm/s at 23 °C. The flow rate shall be
238 estimated by using the formula found in A.2 of Annex A of ISO 4589-2.
239 8.1.2 Select an initial volume fraction of oxygen to be used. When possible, base this on experience of
240 results for similar materials. Alternatively, try to ignite a test specimen in the chimney supplied with mixed gas
241 and heated to the test temperature, and note the burning behaviour. If the specimen burns rapidly, select an
242 initial volume fraction of about 18 % of oxygen; if the test specimen burns gently or unsteadily, select an initial
243 oxygen volume fraction of about 21 %; if the specimen does not continue to burn in air, select an initial volume
244 fraction of at least 25 %, depending upon the difficulty of ignition or the period of burning before extinguishing
245 in air.
246 8.1.3 When the temperature in the test chimney is stable and in accordance with the limits given in 5.2,
247 mount a specimen in the centre of the chimney so that the top of the specimen is at least 100 mm below the
248 open top of the chimney and the lowest exposed part of the specimen is at least 100 mm above the top of the
249 gas distribution device at the base of the chimney.
250 8.1.4 Preheat the specimen for 240 s ± 10 s for it to reach a temperature within the applicable test
251 temperature tolerance before ignition.
252 8.1.5 Set the gas mixing and flow controls so that an oxygen/nitrogen mixture at 23 °C, containing the
253 desired volume fraction of oxygen, flows within the chimney at 40 mm/s ± 0,8 mm/s. Let the gas flow purge
254 the chimney for at least 30 s prior to ignition of each specimen, and maintain the flow without change during
255 ignition and combustion of each specimen. The flow rate shall be estimated by using the formula found in A.2
256 of Annex A of ISO 4589-2.
257 Record the volume fraction of oxygen used, which is measured by an oxygen analyzer or calculated in
258 accordance with the equations given in annex B of ISO 4589-2.
259 8.2 Igniting the test specimen
260 Ignite the specimen in accordance with 8.2 of ISO 4589-2, using procedure A or procedure B.
261 8.3 Assessing burning behaviour
262 The burning behaviour of individual test specimens shall be assessed in accordance with 8.3 of ISO 4589-2,
263 except that the test temperature shall be determined by this part of the standard.
264 8.4 Selecting successive volume fractions of oxygen
265 The volume fraction of oxygen required for the purpose of 8.4 to 8.6 shall be calculated in accordance with
266 annex B of ISO 4589-2.
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oSIST prEN ISO 4589-3:2016
ISO/DIS 4589-3
267 Select successive volume fractions of oxygen in accordance with 8.4 of ISO 4589-2.
268 8.5 Determining the prelimi
...
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