SIST EN ISO 4589-2:2017

Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:2017)

This document specifies methods for determining the minimum volume fraction of oxygen, in
admixture with nitrogen, that will support combustion of small vertical test specimens under specified
test conditions. The results are defined as oxygen index (OI) values.
Methods are provided for testing materials that are self-supporting in the form of vertical bars or sheets
up to 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized
by an apparent density 100 kg/m3 or greater. The methods might also be applicable to some cellular
materials having an apparent density of less than 100 kg/m3. A method is provided for testing flexible
sheets or film materials while supported vertically.
For comparative purposes, a procedure is provided for determining whether or not the OI of a material
lies above some specified minimum value.
NOTE 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.

Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 2: Prüfung bei Umgebungstemperatur (ISO 4589-2:2017)

Dieser Teil von ISO 4589 legt Verfahren zur Bestimmung des minimalen Volumenanteils an Sauerstoff in Gemischen mit Stickstoff fest, bei dem die Verbrennung senkrecht angeordneter kleiner Probekörper unter festgelegten Prüfbedingungen unterstützt wird. Die Ergebnisse sind als Sauerstoff-Index-Werte definiert.
Es werden Verfahren für die Prüfung von Werkstoffen angegeben, die als senkrechte Stäbe oder Platten von maximal 10,5 mm Dicke selbsttragend sind. Diese Verfahren sind für feste und mehrschichtige Werkstoffe oder Schaumstoffe mit einer Rohdichte von 100 kg/m3 oder größer geeignet. Die Verfahren dürfen auch auf einige Schaumstoffe angewendet werden, deren Rohdichte weniger als 100 kg/m3 beträgt. Es wird ein Verfahren zur Prüfung senkrecht gehaltener flexibler Platten- oder Folienwerkstoffe beschrieben.
Für Vergleichszwecke wird ein Verfahren angegeben, mit dem bestimmt werden kann, ob der Sauerstoff-Index von einem Werkstoff über einem festgelegten Mindestwert liegt.
Ergebnisse des Sauerstoff-Index, die mit den in diesem Teil von ISO 4589 beschriebenen Verfahren erhalten wurden, können ein empfindliches Maß für das Brennverhalten von Werkstoffen unter bestimmten geregelten Laboratoriumsbedingungen bieten und somit nützlich bei der Qualitätskontrolle sein. Die erhaltenen Ergebnisse sind abhängig von Form, Ausrichtung und Isolierung der Probekörper sowie von den Zündbedingungen. Für bestimmte Werkstoffe oder Anwendungen kann es erforderlich oder geeignet sein, abweichende Zündbedingungen festzulegen. Es kann sein, dass Ergebnisse, die von Probekörpern unterschiedlicher Dicken oder durch Anwendung unterschiedlicher Zündverfahren erhalten wurden, nicht vergleichbar sind, und es kann auf keine Korrelation mit der Entflammbarkeit unter anderen Brand¬bedingungen geschlossen werden.
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 Brandrisiko¬bewertung verwendet, die alle für die Bewertung der Brandgefahr bei einer bestimmten Werkstoff¬anwendung 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, für die Prüfung horizontaler Brenneigenschaften verwiesen.

Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène - Partie 2: Essai à la température ambiante (ISO 4589-2:2017)

ISO 4589-2:2017 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. Les résultats sont définis en tant que valeurs de l'indice d'oxygène (OI).
Les méthodes sont définies pour les essais de matériaux autoportants sous forme de barreaux verticaux ou de feuilles ayant une épaisseur maximale de 10,5 mm. Ces méthodes sont utilisables pour les matériaux compacts, stratifiés ou alvéolaires ayant une masse volumique apparente supérieure ou égale à 100 kg/m3. Elles peuvent également être 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.
Un procédé permettant de déterminer si l'OI d'un matériau se situe ou non au-dessus d'une valeur minimale spécifiée est donné afin de pouvoir établir des comparaisons.

Polimerni materiali - Določanje gorljivosti s kisikovim indeksom - 2. del: Preskus pri sobni temperaturi (ISO 4589-2:2017)

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 tankoplastnih 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. tankoslojni materiali.

General Information

• Status: Published
• Public Enquiry End Date: 03-May-2016
• Publication Date: 29-May-2017
• 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: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-May-2017
• Due Date: 24-Jul-2017
• Completion Date: 30-May-2017
• Ref Project: EN ISO 4589-2:2017 - Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:2017)

Relations

• Revised: SIST EN ISO 4589-2:2000 - Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:1996)
• Effective Date: 01-Apr-2016
• Replaces: SIST EN ISO 4589-2:2000 - Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:1996)
• Effective Date: 17-May-2017
• Replaces: SIST EN ISO 4589-2:2000/A1:2006 - Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:1996/Amd 1:2005)
• Effective Date: 17-May-2017
• Replaces: SIST EN ISO 4589-2:2000 - Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2:1996)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 4589-2:2017
01-julij-2017
1DGRPHãþD
SIST EN ISO 4589-2:2000
SIST EN ISO 4589-2:2000/A1:2006
3ROLPHUQLPDWHULDOL'RORþDQMHJRUOMLYRVWLVNLVLNRYLPLQGHNVRPGHO3UHVNXV
SULVREQLWHPSHUDWXUL,62
Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-
temperature test (ISO 4589-2:2017)
Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 2:
Prüfung bei Umgebungstemperatur (ISO 4589-2:2017)
Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène -
Partie 2: Essai à la température ambiante (ISO 4589-2:2017)
Ta slovenski standard je istoveten z: EN ISO 4589-2:2017
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
SIST EN ISO 4589-2:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4589-2:2017

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SIST EN ISO 4589-2:2017


EN ISO 4589-2
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2017
EUROPÄISCHE NORM
ICS 13.220.40; 83.080.01 Supersedes EN ISO 4589-2:1999
English Version

Plastics - Determination of burning behaviour by oxygen
index - Part 2: Ambient-temperature test (ISO 4589-
2:2017)
Plastiques - Détermination du comportement au feu au Kunststoffe - Bestimmung des Brennverhaltens durch
moyen de l'indice d'oxygène - Partie 2: Essai à la den Sauerstoff-Index - Teil 2: Prüfung bei
température ambiante (ISO 4589-2:2017) Umgebungstemperatur (ISO 4589-2:2017)
This European Standard was approved by CEN on 13 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 4589-2:2017 E
worldwide for CEN national Members.

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SIST EN ISO 4589-2:2017
EN ISO 4589-2:2017 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 4589-2:2017
EN ISO 4589-2:2017 (E)
European foreword
This document (EN ISO 4589-2:2017) 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 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 4589-2:1999.
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 4589-2:2017 has been approved by CEN as EN ISO 4589-2:2017 without any
modification.
3

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SIST EN ISO 4589-2:2017

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SIST EN ISO 4589-2:2017
INTERNATIONAL ISO
STANDARD 4589-2
Second edition
2017-04
Plastics — Determination of burning
behaviour by oxygen index —
Part 2:
Ambient-temperature test
Plastiques — Détermination du comportement au feu au moyen de
l’indice d’oxygène —
Partie 2: Essai à la température ambiante
Reference number
ISO 4589-2:2017(E)
©
ISO 2017

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(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
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Test chimney . 2
5.2 Test specimen holder. 2
5.3 Gas supplies . 6
5.4 Gas control devices . 7
5.5 Oxygen analyser . 7
5.6 Flame igniter . 7
5.7 Timing device . 7
5.8 Fume extraction system . 8
5.9 Tool for preparing rolled film . 8
6 Calibration of equipment. 8
7 Preparation of test specimens . 8
7.1 Sampling . 8
7.2 Test specimen dimensions and preparation . 9
7.3 Marking of test specimens .11
7.3.1 General.11
7.3.2 Marks for testing by top surface ignition .11
7.3.3 Marks for testing by propagating ignition .11
7.4 Conditioning .11
8 Procedure for determination of oxygen index .12
8.1 General .12
8.2 Setting up the apparatus and test specimen .12
8.3 Igniting the test specimen .13
8.3.1 General.13
8.3.2 Procedure A — Top surface ignition .13
8.3.3 Procedure B — Propagating ignition .13
8.4 Assessing the burning behaviour of individual test specimens . .13
8.5 Selecting successive volume fractions of oxygen .14
8.6 Determining the preliminary volume fraction of oxygen .15
8.7 Volume fraction of oxygen changes .15
9 Calculations and expression of results .16
9.1 Oxygen index.16
9.2 Determination of k .17
9.3 Standard deviation of oxygen volume fraction measurements .17
9.4 Precision of results .18
10 Comparison with a specified minimum value of the oxygen index (short procedure) .19
10.1 General .19
10.2 Setting up the apparatus and test specimen .19
10.3 Igniting the test specimen .19
10.4 Assessing the burning behaviour of the test specimens .19
10.5 Expressing of results .19
11 Test report .19
Annex A (normative) Calibration of equipment .20
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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Annex B (normative) Calculation of volume fraction of oxygen .22
Annex C (informative) Typical test results sheet .23
Annex D (informative) Results obtained by interlaboratory trials on type VI specimens .25
Annex E (informative) Precision data obtained from an interlaboratory trial carried out
in 1978-1980 .26
Bibliography .27
iv © ISO 2017 – All rights reserved

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(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 second edition cancels and replaces the first edition (ISO 4589-2:1996), which has been technically
revised. It also incorporates the Amendment ISO 4589-2:1996/Amd.1:2005.
A list of all parts in the ISO 4589 series can be found on the ISO website.
© ISO 2017 – All rights reserved v

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Introduction
Oxygen index (OI) results obtained using the methods described in this document can provide a sensitive
measure of the burning characteristics of materials under certain controlled laboratory conditions, and
hence may be useful for quality control purposes. The results obtained are dependent upon the shape,
orientation and isolation of the test specimen and the conditions of ignition. For particular materials or
applications, it may be necessary or appropriate to specify different test conditions. Results obtained
from test specimens of differing thickness or by using different ignition procedures may not be
comparable and no correlation with flammability behaviour under other fire conditions is implied.
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 that takes into account all of the factors pertinent to the assessment of
the fire hazard of a particular application for the material.
3
For assessing the flame propagation properties of cellular materials of density < 100 kg/m , attention
is drawn to the method described in ISO 3582.
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SIST EN ISO 4589-2:2017
INTERNATIONAL STANDARD ISO 4589-2:2017(E)
Plastics — Determination of burning behaviour by
oxygen index —
Part 2:
Ambient-temperature test
1 Scope
This document specifies methods for determining the minimum volume fraction of oxygen, in
admixture with nitrogen, that will support combustion of small vertical test specimens under specified
test conditions. The results are defined as oxygen index (OI) values.
Methods are provided for testing materials that are self-supporting in the form of vertical bars or sheets
up to 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized
3
by an apparent density 100 kg/m or greater. The methods might also be applicable to some cellular
3
materials having an apparent density of less than 100 kg/m . A method is provided for testing flexible
sheets or film materials while supported vertically.
For comparative purposes, a procedure is provided for determining whether or not the OI of a material
lies above some specified minimum value.
NOTE 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.
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 291:2008, Plastics — Standard atmospheres for conditioning and testing
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 2859-2, Sampling procedures for inspection by attributes — Part 2: Sampling plans indexed by limiting
quality (LQ) for isolated lot inspection
ISO 4589-1, Plastics — Determination of burning behaviour by oxygen index — Part 1: General requirements
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
ISO 7823-1, Plastics — Poly(methyl methacrylate) sheets — Types, dimensions and characteristics —
Part 1: Cast sheets
ISO 13943, Fire safety −Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4589-1 and ISO 13943 apply.
© ISO 2017 – All rights reserved 1

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(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
4 Principle
A small test specimen is supported vertically in a mixture of oxygen and nitrogen flowing upwards
through a transparent 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 burned, with specified limits for such burning. By testing a series of specimens in different
volume fractions of oxygen, the OI is estimated (see 8.7).
Alternatively, for comparison with a specified OI, three test specimens are tested using the relevant
volume fraction of oxygen, at least two of which are required to given an “O” response (see 8.4) in order
to meet the specified OI.
5 Apparatus
5.1 Test chimney
The test chimney shall consist of a heat-resistant glass tube supported vertically on a base through
which oxygen-containing gas mixtures can be introduced (see Figure 1).
The recommended dimensions of the chimney are 450 mm to 500 mm height and 75 mm to 100 mm
inside diameter.
The upper outlet shall be restricted as necessary by an overhead cap having an outlet small enough to
produce an exhaust velocity of at least 90 mm/s from that outlet. The flow rate shall be calculated by
using the formula found in A.2.
NOTE 1 Measurement of flow rate or flow speed at the specimen position helps for checking gas leaks.
NOTE 2 A cap converging to an outlet of 40 mm diameter at a level at least 10 mm above the top of the
cylindrical chimney has been found satisfactory.
Chimneys of other dimensions, with or without restricted outlets, are suitable for use, if shown to give
equivalent results. The bottom of the chimney, or the base upon which the chimney is supported, shall
incorporate a device for evenly distributing the gas mixture entering the chimney. The preferred device
comprises a diffuser and a mixing chamber with metal foil (honeycomb) or glass beads. Other devices,
such as radial manifolds are suitable for use, if shown to give equivalent results. The mounting of a
porous screen below the level of the specimen holder is helpful to prevent falling combustion debris
from fouling the gas entry and distribution paths. One option is to construct the chimney in such a way
that it can be divided in half, so as to make the setting of samples and cleaning easier.
The use of a levelling device and indicator incorporated within the chimney support will aid vertical
alignment of the chimney and of a test specimen supported therein. If a dark background is provided,
this will aid the observation of flames within the chimney.
5.2 Test specimen holder
The specimen holder shall be suitable for supporting a specimen vertically in the centre of the chimney.
For self-supporting materials, the specimen shall be held by a small clamp, which is at least 15 mm away
from the nearest point at which it is possible that the specimen will burn before the extent-of-burning
criterion is exceeded. For supported film or sheet test specimens, the specimen shall be supported by
both vertical edges in a frame equivalent to that illustrated by Figure 6, with reference marks at 20 mm
and 100 mm below the top of the frame.
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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

It is recommended that the profile of the holder and its support is smooth to minimize induction of
turbulence in the rising flow gas.
Dimensions in millimetres
Key
1 chimney 6 optional temperature measurement device
2 chimney cap 7 tube
3 specimen holder 8 test specimen
4 wire-mesh debris screen 9 oxygen/nitrogen mixture
5 diffuser and a mixing chamber 10 flame igniter
Figure 1 — Typical apparatus for determination of oxygen index
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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Key
1 oxygen 6 flow meter
2 nitrogen 7 reference gas
3 needle valve 8 to exhaust
4 calibrated flow meter 9 to chimney
5 oxygen analyser
Figure 2 — Typical flow system incorporating the elements described in 5.4, a)
Key
1 oxygen 6 oxygen analyser
2 nitrogen 7 flow meter
3 needle valve 8 reference gas
4 pressure gauge 9 to exhaust
5 calibrated orifice 10 to chimney
Figure 3 — Typical flow system incorporating the elements described in 5.4, b)
4 © ISO 2017 – All rights reserved

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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Key
1 oxygen 6 flow meter
2 nitrogen 7 reference gas
3 needle valve 8 to exhaust
4 calibrated flow meter 9 to chimney
5 oxygen analyser
Figure 4 — Diagram of typical flow system incorporating the elements described in 5.4, c)
Key
1 oxygen 6 flow meter
2 nitrogen 7 reference gas
3 calibrated mass flow controller 8 to exhaust
4 oxygen analyser 9 to chimney
5 needle valve
Figure 5 — Typical flow system incorporating the elements described in 5.4, d)
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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

Dimensions in millimetres with tolerances ± 0,25 mm
Key
1 upper reference mark
2 lower reference mark
NOTE The test specimen is held securely along both upright edges between forks made of stainless steel.
Figure 6 — Support frame for non-self-supporting test specimens
5.3 Gas supplies
The gas supplies shall comprise pressurized sources of oxygen and/or nitrogen not less than 98 %
(mass fraction) pure and/or clean air [containing 20,9 % (volume fraction) oxygen], as appropriate.
The moisture content of the gas mixture entering the chimney shall be < 0,1 % (mass fraction), unless
the results have been shown to be insensitive to higher moisture levels in the gas mixture. The gas
supply system shall incorporate a drying device, or provision for monitoring or sampling the gas supply
for moisture content, unless the moisture content of the gas supplies is known to be acceptable.
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SIST EN ISO 4589-2:2017
ISO 4589-2:2017(E)

The constituent gas supply lines shall be linked in a manner which thoroughly mixes the gases, before
they enter the gas distribution device at the base of the chimney, so that the variation in volume fraction
of oxygen in the gas mixture rising in the chimney, below the level of
...

SLOVENSKI STANDARD
oSIST prEN ISO 4589-2:2016
01-april-2016
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Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-
temperature test (ISO/DIS 4589-2:2016)
Kunststoffe - Bestimmung des Brennverhaltens durch den Sauerstoff-Index - Teil 2:
Prüfung bei Umgebungstemperatur (ISO/DIS 4589-2:2016)
Plastiques - Détermination du comportement au feu au moyen de l'indice d'oxygène -
Partie 2: Essai à la température ambiante (ISO/DIS 4589-2:2016)
Ta slovenski standard je istoveten z: prEN ISO 4589-2
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 4589-2:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 4589-2:2016

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oSIST prEN ISO 4589-2:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4589-2
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 2:
Ambient-temperature test
Plastiques — Détermination du comportement au feu au moyen de l’indice d’oxygène —
Partie 2: Essai à la température ambiante
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 4589-2:2016(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

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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2:2016(E) ISO/DIS 4589-2

1 Contents Page
2 Foreword .v
3 Introduction.vi
4 1 Scope.1
5 2 Normative references.1
6 3 Definition .2
7 4 Principle .2
8 5 Apparatus.2
9 5.1 Test chimney.2
10 5.2 Test specimen holder.3
11 5.3 Gas supplies .7
12 5.4 Gas control devices .8
13 5.5 Oxygen analyser.8
14 5.6 Flame igniter .8
15 5.7 Timing device.9
16 5.8 Fume extraction system .9
17 5.9 Tool for preparing rolled film .9
18 6 Calibration of equipment .9
19 7 Preparation of test specimens .9
20 7.1 Sampling .9
21 7.2 Test specimen dimensions and preparation .10
22 7.3 Marking of test specimens .12
23 7.3.1 General .12
24 7.3.2 Marks for testing by top surface ignition .12
25 7.3.3 Marks for testing by propagating ignition .12
26 7.4 Conditioning .12
27 8 Procedure for determination of oxygen index .13
28 8.1 Setting up the apparatus and test specimen.13
29 8.2 Igniting the test specimen .13
30 8.2.1 General .13
31 8.2.2 Procedure A  Top surface ignition. 14
32 8.2.3 Procedure B  Propagating ignition .14
33 8.3 Assessing the burning behaviour of individual test specimens.14
34 8.4 Selecting successive volume fractions of oxygen .15
35 8.5 Determining the preliminary volume fraction of oxygen. 15
36 8.6 Volume fraction of oxygen changes.16
37 9 Calculations and expression of results .17
COPYRIGHT PROTECTED DOCUMENT
38 9.1 Oxygen index .17
39 9.2 Determination of k .18
© ISO 2016, Published in Switzerland
40 9.3 Standard deviation of oxygen volume fraction measurements .19
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
41 9.4 Precision of results .19
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
42 10 Comparison with a specified minimum value of the oxygen index (short procedure) .20
the requester.
43 10.1 Setting up the apparatus and test specimen.20
ISO copyright office
44 10.2 Igniting the test specimen .20
Ch. de Blandonnet 8 • CP 401
45 10.3 Assessing the burning behaviour of the test specimens .20
CH-1214 Vernier, Geneva, Switzerland
46 10.4 Expressing of results.20
Tel. [phone]
Fax [phone]
47 11 Test report.21
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved
© ISO 2015 – All rights reserved iii

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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2
1 Contents Page
2 Foreword . v
3 Introduction . vi
4 1 Scope . 1
5 2 Normative references . 1
6 3 Definition . 2
7 4 Principle . 2
8 5 Apparatus . 2
9 5.1 Test chimney . 2
10 5.2 Test specimen holder. 3
11 5.3 Gas supplies . 7
12 5.4 Gas control devices . 8
13 5.5 Oxygen analyser . 8
14 5.6 Flame igniter . 8
15 5.7 Timing device . 9
16 5.8 Fume extraction system . 9
17 5.9 Tool for preparing rolled film . 9
18 6 Calibration of equipment . 9
19 7 Preparation of test specimens . 9
20 7.1 Sampling . 9
21 7.2 Test specimen dimensions and preparation . 10
22 7.3 Marking of test specimens . 12
23 7.3.1 General . 12
24 7.3.2 Marks for testing by top surface ignition . 12
25 7.3.3 Marks for testing by propagating ignition . 12
26 7.4 Conditioning . 12
27 8 Procedure for determination of oxygen index . 13
28 8.1 Setting up the apparatus and test specimen . 13
29 8.2 Igniting the test specimen . 13
30 8.2.1 General . 13
31 8.2.2 Procedure A  Top surface ignition . 14
32 8.2.3 Procedure B  Propagating ignition . 14
33 8.3 Assessing the burning behaviour of individual test specimens . 14
34 8.4 Selecting successive volume fractions of oxygen . 15
35 8.5 Determining the preliminary volume fraction of oxygen. 15
36 8.6 Volume fraction of oxygen changes . 16
37 9 Calculations and expression of results . 17
38 9.1 Oxygen index . 17
39 9.2 Determination of k . 18
40 9.3 Standard deviation of oxygen volume fraction measurements . 19
41 9.4 Precision of results . 19
42 10 Comparison with a specified minimum value of the oxygen index (short procedure) . 20
43 10.1 Setting up the apparatus and test specimen . 20
44 10.2 Igniting the test specimen . 20
45 10.3 Assessing the burning behaviour of the test specimens . 20
46 10.4 Expressing of results . 20
47 11 Test report . 21
© ISO 2015 – All rights reserved iii

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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2
48 Annex A (normative) Calibration of equipment . 22
49 A.1 Leak tests . 22
50 A.2 Gas flow rates . 22
51 A.3 Oxygen analyser . 22
52 A.4 Mass flow controller . 22
53 A.5 Performance check of complete equipment . 22
54 Annex B (normative) Calculation of volume fraction of oxygen . 24
55 Annex C (informative) Typical test results sheet . 25
56 Annex D (informative) Results obtained by interlaboratory trials on type VI specimens . 28
57 Annex E (informative) Precision data obtained from an interlaboratory trial carried out in 1978-80 . 29
58 Bibliography . 30
59
iv © ISO 2015 – All rights reserved

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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2
60 Foreword
61 ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
62 (ISO member bodies). The work of preparing International Standards is normally carried out through ISO
63 technical committees. Each member body interested in a subject for which a technical committee has been
64 established has the right to be represented on that committee. International organizations, governmental and
65 non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
66 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
67 International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
68 The main task of technical committees is to prepare International Standards. Draft International Standards
69 adopted by the technical committees are circulated to the member bodies for voting. Publication as an
70 International Standard requires approval by at least 75 % of the member bodies casting a vote.
71 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
72 rights. ISO shall not be held responsible for identifying any or all such patent rights.
73 ISO 4589-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning
74 behaviour.
75 This second edition cancels and replaces the first edition (ISO 4589-2:1996) and Amendment 1 (2005), which
76 have been technically revised.
77 ISO 4589 consists of the following parts, under the general title Plastics — Determination of burning behaviour
78 by oxygen index:
79  Part 1: Guidance:
80  Part 2: Ambient-temperature test
81  Part 3: Elevated-temperature test
82 Annexes A and B form an integral part of this part of ISO 4589. Annexes C and D are for information only.
83
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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2
84 Introduction
85 This part of ISO4589 defines specifications of apparatus and preparation method of samples for determining
86 Oxygen index at ambient temperature. In addition, procedures for determining Oxygen index using the
87 apparatus and the samples is also defined.
vi © ISO 2015 – All rights reserved

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oSIST prEN ISO 4589-2:2016
DRAFT INTERNATIONAL STANDARD ISO/DIS 4589-2
88 Plastics — Determination of burning behaviour by oxygen
89 index — Part 2: Ambient-temperature test
90 1 Scope
91 This part of ISO 4589 specifies methods for determining the minimum volume fraction of oxygen, in admixture
92 with nitrogen, that will support combustion of small vertical test specimens under specified test conditions. The
93 results are defined as oxygen index values.
94 Methods are provided for testing materials that are self-supporting in the form of vertical bars or sheet up to
95 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized by an
3
96 apparent density 100 kg/m or greater. The methods may also be applicable to some cellular materials having
3
97 an apparent density of less than 100 kg/m . A method is provided for testing flexible sheet or film materials
98 while supported vertically.
99 For comparative purposes, a procedure is provided for determining whether or not the oxygen index of a
100 material lies above some specified minimum value.
101 Oxygen index results obtained using the methods described in this part of ISO 4589 can provide a sensitive
102 measure of the burning characteristics of materials under certain controlled laboratory conditions, and hence
103 may be useful for quality control purposes. The results obtained are dependent upon the shape, orientation
104 and isolation of the test specimen and the conditions of ignition. For particular materials or applications, it may
105 be necessary or appropriate to specify different test conditions. Results obtained from test specimens of
106 differing thickness or by using different ignition procedures may not be comparable and no correlation with
107 flammability behaviour under other fire conditions is implied.
108 Results obtained in accordance with this part of ISO 4589 is not applicable to describe or appraise the fire
109 hazard presented by a particular material or shape under actual fire conditions, unless used as one element of
110 a fire risk assessment that takes into account all of the factors pertinent to the assessment of the fire hazard of
111 a particular application for the material.
112 NOTE 1 It may not be possible to apply these methods satisfactorily to materials that exhibit high levels of shrinkage
113 when heated, e.g. highly oriented thin film.
3
114 NOTE 2 For assessing the flame propagation properties of cellular materials of density < 100 kg/m , attention is drawn
115 to the method of ISO 3582:2000, Flexible cellular polymeric materials - Laboratory assessment of horizontal burning
116 characteristics of small specimens subjected to a small flame, for testing horizontal burning characteristics
117 2 Normative references
118 The following referenced documents are indispensable for the application of this document. For dated
119 references, only the edition cited applies. For undated references, the latest edition of the referenced
120 document (including any amendments) applies.
121 ISO 291, Plastics – Standard atmospheres for conditioning and testing.
122 ISO 2859-1, Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by
123 acceptable quality limit (AQL) for lot-by-lot inspection.
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oSIST prEN ISO 4589-2:2016
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124 ISO 2859-2, Sampling procedures for inspection by attributes -- Part 2: Sampling plans indexed by limiting
125 quality (LQ) for isolated lot inspection.
126 ISO 7823-1, Poly(methyl methacrylate) sheets - Types, dimensions and characteristics - Part 1: Cast sheets.
127  Vocabulary.
ISO 13943, Fire safety
128 3 Definition
129 For the purposes of this part of ISO 4589, the definitions in ISO 13943 and the following apply.
130 3.1
131 oxygen index
132 OI
133 limiting oxygen index
134 LOI
135 minimum volume fraction of oxygen in a mixture of oxygen and nitrogen, at 23 °C ± 2 °C, that just supports
136 flaming combustion of a material under specified test conditions
137 NOTE It is usually expressed as a percentage; e.g. “OI = 34,6%”.
138 [SOURCE: ISO 13943:2008, 4.248]
139 4 Principle
140 A small test specimen is supported vertically in a mixture of oxygen and nitrogen flowing upwards through a
141 transparent chimney. The upper end of the specimen is ignited and the subsequent burning behavior of the
142 specimen is observed to compare the period for which burning continues, or the length of specimen burnt,
143 with specified limits for such burning. By testing a series of specimens in different volume fractions of oxygen,
144 the oxygen index is estimated (see 8.6).
145 Alternatively, for comparison with a specified oxygen index, three test specimens are tested using the relevant
146 volume fraction of oxygen, at least two of which are required to given an “O” response (see 8.3) in order to
147 meet the specified oxygen index.
148 5 Apparatus
149 5.1 Test chimney
150 The test chimney shall consist of a heat-resistant glass tube supported vertically on a base through which
151 oxygen-containing gas mixtures can be introduced (see Figure 1).
152 The preferred dimensions of the chimney are 450 mm to 500 mm height and 75 mm to 100 mm inside
153 diameter.
154 The upper outlet shall be restricted as necessary by an overhead cap having an outlet small enough to
155 produce an exhaust velocity of at least 90 mm/s from that outlet. The flow rate shall be calculated by using the
156 formula found in A.2 of Annex A.
157 NOTE 1 Measurement of flow rate or flow speed at the specimen position helps for checking gas leaks.
158 NOTE 2 A cap converging to an outlet of 40 mm diameter at a level at least 10 mm above the top of the cylindrical
159 chimney has been found satisfactory
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oSIST prEN ISO 4589-2:2016
ISO/DIS 4589-2
160 Chimneys of other dimensions, with or without restricted outlets, are suitable for use if shown to give
161 equivalent results. The bottom of the chimney, or the base upon which the chimney is supported, shall
162 incorporate a device for distributing evenly the gas mixture entering the chimney. The preferred device
163 comprises a suitable diffuser and a mixing chamber with metal foil (honeycomb) or glass beads. Other devices,
164 such as radial manifolds are suitable for use, if shown to give equivalent results. The mounting of a porous
165 screen below the level of the specimen holder is helpful to prevent falling combustion debris from fouling the
166 gas entry and distribution paths. One option is to construct the chimney in such a way that it can be divided in
167 half, so as to make the setting of samples and cleaning easier.
168 The use of a levelling device and indicator incorporated within the chimney support will facilitate vertical
169 alignment of the chimney and of a test specimen supported therein. If a dark background is provided this will
170 facilitate the observation of flames within the chimney.
171 5.2 Test specimen holder
172 The specimen holder shall be suitable for supporting a specimen vertically in the centre of the chimney.
173 For self-supporting materials, the specimen shall be held by a small clamp which is at least 15 mm away from
174 the nearest point at which it is possible that the specimen will burn before the extent-of-burning criterion is
175 exceeded. For supported film or sheet test specimens, the specimen shall be supported by both vertical edges
176 in a frame equivalent to that illustrated by Figure 6, with reference marks at 20 mm and 100 mm below the top
177 of the frame.
178 It is preferable that the profile of the holder and its support be smooth to mi
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