Fire hazard testing - Part 11-20: Test flames - 500 W flame test method

IEC 60695-11-20:2015 describes a test method consisting of two small-scale laboratory test procedures which is intended to compare the burning behaviour of different materials used in electrotechnical products. Vertically oriented bar specimens or horizontally oriented plate test specimens are exposed to a small flame ignition source with a nominal thermal power of 500 W. The test method uses two test specimen configurations to classify material performance. Rectangular bar-shaped test specimens are used to assess ignitability and burning behaviour, and square plate test specimens are used to assess the resistance of the test specimen to burn-through, as defined in 8.3.3. This test method only applies to materials that have been classified as V-0 or V-1 according to IEC 60695-11-10. This test method is only applicable to solid and cellular materials that have an apparent density of more than 250 kg/m3, determined in accordance with ISO 845. The method does not apply to materials that shrink away from the applied flame without igniting due to their thinness. The test method described provides classifications which may be used for quality assurance, the pre-selection of component materials of products, or to verify the required minimum flammability classification of materials used in end products. If used for pre-selection, then positive results shall be obtained at a test specimen thickness which equals the smallest thickness used in the product application. The results obtained provide some information about the behaviour of materials in service, but cannot by themselves assure safe performance in service. This second edition cancels and replaces the consolidated version of IEC 60695-11-20 published in 2003. This edition constitutes a technical revision. The main changes with respect to the first edition are as follows:
- The Part title has been modified to the singular - 500 W flame test method;
- Editorial changes have been made throughout the document for the purpose of aligning IEC 60695-11-10 with IEC 60695-11-20;
- The Introduction has been modified to clarify the description of the test method;
- The Scope has been modified for clarification;
- All occurrences of the term "fixture" have been deleted from the document;
- Preferred thickness values have been added to 7.2 and 7.3;
- 7.4.4: 'Thickness measurement' is now numbered 7.5 to which a new Table 1 - Thickness tolerances has been added;
- New Subclause 8.1.4 'Conditioning of the cotton pad' has been added;
- 8.2.3 clarifies the application of the test flame to distorted specimens;
- Explanatory notes have been added to Figures 5 and 6 and the Bibliography has been updated and references added. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with IEC Guide 104 and ISO/IEC Guide 51. Key words: Test flames,Fire Hazard, Fire Test Method
This publication is to be read in conjunction with IEC 60695-11-3:2012. The contents of the corrigendum of January 2016 have been included in this copy.

Essais relatifs aux risques du feu - Partie 11-20: Flammes d'essai - Méthode d'essai à la flamme de 500 W

L'IEC 60695-11-20:2015 décrit une méthode d'essai composée de deux procédures d'essai en laboratoire à petite échelle, ayant pour objet de comparer le comportement en combustion des différents matériaux utilisés dans les produits électrotechniques. Des éprouvettes barreaux orientées verticalement ou des éprouvettes d'essai plaques orientées horizontalement sont exposées à une faible source d'allumage à flamme d'une puissance thermique nominale de 500 W. La méthode d'essai utilise deux configurations d'éprouvette d'essai pour classifier les performances du matériau. Des éprouvettes d'essai en forme de barreaux rectangulaires sont utilisées pour évaluer l'allumabilité et le comportement en combustion, et des éprouvettes d'essai plaques carrées sont utilisées pour évaluer la résistance de l'éprouvette d'essai au transpercement, tel que défini en 8.3.3. Cette méthode d'essai s'applique uniquement aux matériaux qui ont été classés comme V-0 ou V-1, conformément à l'IEC 60695-11-10. Cette méthode d'essai s'applique uniquement aux matériaux solides et alvéolaires présentant une masse volumique apparente de plus de 250 kg/m3, déterminée conformément à l'ISO 845. La méthode ne s'applique pas aux matériaux qui se rétractent devant la flamme appliquée sans s'allumer en raison de leur finesse. La méthode d'essai décrite fournit les classifications qui peuvent être utilisées pour l'assurance qualité, la présélection des matériaux constitutifs des produits ou pour vérifier la classification d'inflammabilité minimale requise des matériaux utilisés dans les produits finaux. Si elle est utilisée pour la présélection, des résultats positifs doivent être obtenus à une épaisseur d'éprouvette d'essai égale à la plus petite épaisseur utilisée dans l'application du produit. Les résultats obtenus donnent des informations sur le comportement des matériaux en service, mais ne peuvent pas par eux-mêmes assurer la sécurité en service. Cette deuxième édition annule et remplace la version consolidée de l'IEC 60695-11-20 publiée en 2003. Cette édition constitue une révision technique. Par rapport à la première édition, les changements majeurs sont les suivants:
- le titre de la partie a été modifié au singulier - Méthode d'essai à la flamme de 500 W;
- des modifications éditoriales ont été apportées tout au long du document afin d'aligner l'IEC 60695-11-10 sur l'IEC 60695-11-20;
- l'introduction a été modifiée afin de clarifier la description de la méthode d'essai;
- le domaine d'application a été modifié pour apporter des precisions;
- toutes les occurrences du terme "fixation" ont été supprimées du document;
- les valeurs d'épaisseur préférentielles ont été ajoutées à 7.2 et 7.3;
- 7.4.4: "Mesure de l'épaisseur" fait désormais l'objet du paragraphe 7.5, auquel un nouveau Tableau 1 - Tolérances d'épaisseur, a été ajouté;
- un nouveau paragraphe 8.1.4 "Conditionnement du coussin de coton" a été ajouté;
- le paragraphe 8.2.3 précise l'application de la flamme d'essai aux éprouvettes déformées;
- des notes explicatives ont été ajoutées aux Figures 5 et 6 et la Bibliographie a été mise à jour et des références ont été ajoutées;
Elle a le statut de norme horizontale conformément au IEC Guide 104 et au Guide ISO/IEC 51. Mots clés: flames d'essai, risque du feu, méthode d'essai au feu
Cette publication doit être lue conjointement avec la CEI 60695-11-3:2012. Le contenu du corrigendum de janvier 2016 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
21-Apr-2015
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
22-Apr-2015
Completion Date
22-Apr-2015
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IEC 60695-11-20
Edition 2.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 11-20: Test flames – 500 W flame test method
Essais relatifs aux risques du feu –
Partie 11-20: Flammes d'essai – Méthode d'essai à la flamme de 500 W
IEC 60695-11-20:2015-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60695-11-20
Edition 2.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 11-20: Test flames – 500 W flame test method
Essais relatifs aux risques du feu –
Partie 11-20: Flammes d'essai – Méthode d'essai à la flamme de 500 W
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-2610-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60695-11-20:2015 © IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 7

1 Scope ............................................................................................................................ 8

2 Normative references..................................................................................................... 8

3 Terms and definitions .................................................................................................... 9

4 Principle ...................................................................................................................... 12

5 Significance of the fire tests ......................................................................................... 13

5.1 General ............................................................................................................... 13

5.2 Limitations on the use of test results .................................................................... 13

5.3 Physical properties that can effect burning behaviour ........................................... 13

5.4 Shrinkage and distortion ...................................................................................... 13

5.5 Effects of test specimen conditioning ................................................................... 13

6 Apparatus .................................................................................................................... 13

6.1 Laboratory fumehood/chamber ............................................................................ 13

6.2 Laboratory burner ............................................................................................... 14

6.3 Support stand ..................................................................................................... 14

6.4 Timing device ...................................................................................................... 14

6.5 Measuring scale .................................................................................................. 14

6.6 Conditioning chamber.......................................................................................... 14

6.7 Micrometer .......................................................................................................... 14

6.8 Desiccator chamber ............................................................................................ 14

6.9 Air-circulating oven ............................................................................................. 14

6.10 Cotton pads ........................................................................................................ 14

6.11 Burner mounting block ......................................................................................... 15

7 Test specimens ........................................................................................................... 15

7.1 Test specimen preparation .................................................................................. 15

7.2 Bar test specimens .............................................................................................. 15

7.3 Plate test specimens ........................................................................................... 15

7.4 Testing materials – ranges in formulations ........................................................... 15

7.4.1 General ....................................................................................................... 15

7.4.2 Density, melt flows and filler/reinforcement ................................................... 16

7.4.3 Colour (bar test specimens only) .................................................................. 16

7.5 Thickness measurements .................................................................................... 16

8 Test procedure ............................................................................................................ 17

8.1 Conditioning ........................................................................................................ 17

8.1.1 General ....................................................................................................... 17

8.1.2 Conditioning of specimens in conditioning chamber (“As Received”) .............. 17

8.1.3 Conditioning of specimens in air-circulating oven .......................................... 17

8.1.4 Conditioning of the cotton pad ...................................................................... 17

8.1.5 Test conditions ............................................................................................ 17

8.2 Test procedure – bar test specimens ................................................................... 18

8.2.1 Test specimen setup .................................................................................... 18

8.2.2 Flame setup ................................................................................................. 18

8.2.3 Flame application and observations .............................................................. 18

8.2.4 Criteria for retest .......................................................................................... 19

8.3 Test procedure – plate shaped test specimens ..................................................... 19

---------------------- Page: 4 ----------------------
IEC 60695-11-20:2015 © IEC 2015 – 3 –

8.3.1 Support stand .............................................................................................. 19

8.3.2 Flame setup ................................................................................................. 19

8.3.3 Flame application and observations .............................................................. 19

8.3.4 Criteria for retest .......................................................................................... 19

8.4 Classification ...................................................................................................... 20

8.5 Test report .......................................................................................................... 20

Annex A (normative) Detailed requirements for the flame application point .......................... 26

A.1 Dynamic deformation........................................................................................... 26

A.2 J-shape or twisting deformation ........................................................................... 26

A.3 Curling deformation ............................................................................................. 26

A.4 Severe deformation ............................................................................................. 26

Bibliography ....................................................................................................................... 31

Figure 1 – Vertical burning test for bar test specimen .......................................................... 21

Figure 2 – Horizontal burning test for plates ........................................................................ 22

Figure 3 – Burner mounting block – Example ....................................................................... 22

Figure 4 – Test specimens .................................................................................................. 23

Figure 5 – Examples of flame application ............................................................................ 24

Figure 6 – 5V specimen gauge (Example) ........................................................................... 25

Figure A.1 – Flame application points for a specimen which deforms dynamically ................. 27

Figure A.2 – Flame application point for twisted and J-shaped specimens ............................ 28

Figure A.3 – Flame application point for a curled specimen .................................................. 29

Figure A.4 – Flame application point when there is severe deformation ................................ 30

Table 1 – Thickness tolerances ........................................................................................... 17

Table 2 – 5V burning classification ...................................................................................... 20

---------------------- Page: 5 ----------------------
– 4 – IEC 60695-11-20:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 11-20: Test flames –
500 W flame test method
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60695-11-20 has been prepared by IEC technical committee 89:

Fire hazard testing.
The text of this standard is based on the following documents:
FDIS Report on voting
89/1241/FDIS 89/1250/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
---------------------- Page: 6 ----------------------
IEC 60695-11-20:2015 © IEC 2015 – 5 –

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This second edition cancels and replaces the first edition of IEC 60695-11-20 published in

1999. This edition constitutes a technical revision.
The main changes with respect to the first edition are listed below:
– The Part title has been modified to the singular – 500 W flame test method.

– Editorial changes have been made throughout the document for the purpose of aligning

IEC 60695-11-10 with IEC 60695-11-20.

– The Introduction has been modified to clarify the description of the test method.

– The Scope has been modified for clarification.
– All occurrences of the term “fixture” have been deleted from the document.
– Preferred thickness values have been added to 7.2 and 7.3.

– 7.4.4: ‘Thickness measurement’ is now numbered 7.5 to which a new Table 1 – Thickness

tolerances has been added.
– New Subclause 8.1.4 ‘Conditioning of the cotton pad’ has been added.
– 8.2.3 clarifies the application of the test flame to distorted specimens
– Explanatory notes have been added to Figures 5 and 6.
– The Bibliography has been updated and references added.

It has the status of a basic safety publication in accordance with IEC Guide 104 and

ISO/IEC Guide 51.
This International Standard is to be used in conjunction with IEC 60695-11-3.

A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can

be found on the IEC website.
Part 11 consists of the following parts:

Part 11-2: Test flames – 1 kW nominal pre-mixed flame – Apparatus, confirmatory test

arrangement and guidance

Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test methods

Part 11-4: Test flames – 50 W flame – Apparatus and confirmational test method
Part 11-5: Test flames – Needle-flame test method – Apparatus, confirmatory test
arrangement and guidance
Part 11-10: Test flames – 50 W horizontal and vertical flame test methods

Part 11-11: Test flames – Determination of the characteristic heat flux for ignition from a

non-contacting flame source
Part 11-20: Test flames – 500 W flame test methods
Part 11-30: Test flames – History and development from 1979 to 1999
Part 11-40: Test flames – Confirmatory tests – Guidance
---------------------- Page: 7 ----------------------
– 6 – IEC 60695-11-20:2015 © IEC 2015

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of January 2016 have been included in this copy.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 8 ----------------------
IEC 60695-11-20:2015 © IEC 2015 – 7 –
INTRODUCTION

In the design of an electrotechnical product the risk of fire and the potential hazards

associated with fire need to be considered. In this respect the objective of component, circuit

and equipment design as well as the choice of materials is to reduce to a tolerable level of

risk of fire even in the event of reasonably foreseeable (mis)use, malfunction or failure. Fires

involving electrotechnical products can also be initiated from external non-electrical sources.

Considerations of this nature are dealt with in the overall fire hazard assessment.

The aim of the IEC 60695 series of standards is to save lives and property by reducing the

number of fires or reducing the consequences of the fire. This can be accomplished by:

– trying to prevent ignition caused by an electrically energised component part and, in the

event of ignition, to confine any resulting fire within the bounds of the enclosure of the

electrotechnical product.

– trying to minimise flame spread beyond the product’s enclosure and to minimise the

harmful effects of fire effluents including heat, smoke, and toxic or corrosive combustion

products.

This part of IEC 60695 describes a test method which consists of two small-scale fire test

procedures carried out on materials used in electrotechnical equipment. A 500 W test flame is

used as an ignition source. The test method described provides classifications which may be

used for quality assurance, the pre-selection of component materials of products, or to verify

the required minimum flammability classification of materials used in end products.

This test method should not be used to solely describe or appraise the fire hazard or fire risk

of materials, products, or assemblies under actual fire conditions. However, results of this test

may be used as elements of a fire hazard assessment which takes into account all of the

factors which are pertinent to a particular end use.

This international standard may involve hazardous materials, operations, and equipment. It

does not purport to address all of the safety problems associated with its use. It is the

responsibility of the user of this international standard to establish appropriate safety and

health practices and determine the applicability of regulatory limitations prior to use.

---------------------- Page: 9 ----------------------
– 8 – IEC 60695-11-20:2015 © IEC 2015
FIRE HAZARD TESTING –
Part 11-20: Test flames –
500 W flame test method
1 Scope

This part of IEC 60695 describes a test method consisting of two small-scale laboratory test

procedures which is intended to compare the burning behaviour of different materials used in

electrotechnical products. Vertically oriented bar specimens or horizontally oriented plate test

specimens are exposed to a small flame ignition source with a nominal thermal power of

500 W. The test method uses two test specimen configurations to classify material

performance. Rectangular bar-shaped test specimens are used to assess ignitability and

burning behaviour, and square plate test specimens are used to assess the resistance of the

test specimen to burn-through, as defined in 8.3.3. This test method only applies to materials

that have been classified as V-0 or V-1 according to IEC 60695-11-10.

This test method is only applicable to solid and cellular materials that have an apparent

density of more than 250 kg/m , determined in accordance with ISO 845. The method does

not apply to materials that shrink away from the applied flame without igniting due to their

thinness.

The test method described provides classifications which may be used for quality assurance,

the pre-selection of component materials of products, or to verify the required minimum

flammability classification of materials used in end products. If used for pre-selection, then

positive results shall be obtained at a test specimen thickness which equals the smallest

thickness used in the product application.

The results obtained provide some information about the behaviour of materials in service, but

cannot by themselves assure safe performance in service.
NOTE 1 Guidance on pre-selection is given in IEC 60695-1-30 [3] .

NOTE 2 Test results are influenced by material additives, e.g. pigments, fillers, and fire retardants, and properties

such as the direction of anisotropy and the molecular mass.

This basic safety publication is intended for use by technical committees in the preparation of

standards in accordance with the principles laid down in IEC Guide 104 and
ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of

basic safety publications in the preparation of its publications. The requirements, test

methods or test conditions of this basic safety publication will not apply unless specifically

referred to or included in the relevant publications.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
________________
Numbers in square brackets refer to the bibliography.
---------------------- Page: 10 ----------------------
IEC 60695-11-20:2015 © IEC 2015 – 9 –

IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for

electrotechnical products

IEC 60695-11-3, Fire hazard testing – Part 11-3: Test flames – 500 W flames – Apparatus and

confirmational test methods

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods

IEC Guide 104, The preparation of safety publications and the use of basic safety publications

and group safety publications
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
ISO/IEC 13943:2008, Fire Safety – Vocabulary
ISO 291, Plastics – Standard atmospheres for conditioning and testing

ISO 293, Plastics – Compression moulding test specimens of thermoplastic materials

ISO 294:1996 (all parts), Plastics – Injection moulding of test specimens of thermoplastic

materials

ISO 295, Plastics – Compression moulding of test specimens of thermosetting materials

ISO 845, Cellular plastics and rubbers – Determination of apparent density
ISO 16012, Plastics – Determination of linear dimensions of test specimens
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 13943:2008

and IEC 60695-4:2005, some of which are reproduced below for the user’s convenience, as

well as the following apply.
3.1
afterflame
flame that persists after the ignition source has been removed
[SOURCE: ISO/IEC 13943:2008, definition 4.6]
3.2
afterflame time
length of time for which an afterflame persists under specified test conditions
Note 1 to entry: Designated in this standard by the parameter t .
[SOURCE: ISO/IEC 13943:2008, definition 4.7]
3.3
afterglow

persistence of glowing combustion after both removal of the ignition source and the cessation

of any flaming combustion
[SOURCE: ISO/IEC 13943:2008, definition 4.8]
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– 10 – IEC 60695-11-20:2015 © IEC 2015
3.4
afterglow time
length of time which an afterglow persists under specified test
...

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