IEC 60695-11-11:2021

Fire hazard testing - Part 11-11: Test flames - Determination of the characteristic heat flux for ignition from a non-contacting flame source

IEC 60695-11-11:2021 describes a test method used to determine the characteristic heat flux for ignition (CHFI) from a non-contacting flame source for materials used in electrotechnical products, sub-assemblies or their parts. It provides a relationship between ignition time and incident heat flux. A test specimen cut from an end-product or sub-assembly can be tested by this test method.
This part of IEC 60695 can be used in the fire hazard assessment and fire safety engineering procedures described in IEC 60695-1-10, IEC 60695-1-11 and IEC 60695-1-12.
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.
This international standard is to be used in conjunction with IEC 60695-11-4.
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51.

Essais relatifs aux risques du feu - Partie 11-11: Flammes d’essai - Détermination de la densité de flux de chaleur caractéristique pour l'allumage à partir d'une flamme source sans contact

IEC 60695-11-11:2021 décrit une méthode d’essai utilisée pour déterminer la densité de flux de chaleur caractéristique pour l’allumage (CHFI) à partir d’une flamme source sans contact pour les matériaux utilisés dans les produits et les sous-ensembles électrotechniques ou leurs composants. Elle donne une relation entre le temps d'allumage et la densité de flux de chaleur incident. Une éprouvette d’essai prélevée sur un produit fini ou un sous-ensemble peut être soumise à l’essai selon la présente méthode d’essai.
La présente partie de l’IEC 60695 peut être utilisée dans l'évaluation des dangers d’incendie et les procédures d’ingénierie de la sécurité incendie décrites dans l’IEC 60695-1-10, l’IEC 60695 1 11 et l’IEC 60695-1-12.
La présente publication fondamentale de sécurité est destinée à être utilisée par les comités d'études dans le cadre de l'élaboration de normes conformément aux principes établis dans le Guide IEC 104 et le Guide ISO/IEC 51.
L'une des responsabilités d'un comité d'études consiste, le cas échéant, à utiliser les publications fondamentales de sécurité dans le cadre de l'élaboration de ses publications. Les exigences, les méthodes ou les conditions d'essai de la présente publication fondamentale de sécurité s'appliquent seulement si elles sont spécifiquement citées en référence ou incluses dans les publications correspondantes.
Cette Norme internationale doit être utilisée conjointement avec l’IEC 60695-11-4.
Elle a le statut d'une publication fondamentale de sécurité conformément au Guide IEC 104 et au Guide ISO/IEC 51.

General Information

• Status: Published
• Publication Date: 26-May-2021
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: TC 89 - Fire hazard testing
• Drafting Committee: WG 12 - TC 89/WG 12
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jun-2021
• Completion Date: 27-May-2021

Relations

• Replaces: IEC TS 60695-11-11:2016 - Fire hazard testing - Part 11-11: Test flames - Determination of the characteristic heat flux for ignition from a non-contacting flame source
• Effective Date: 05-Sep-2023
• Revises: IEC TS 60695-11-11:2008 - Fire hazard testing - Part 11-11: Test flames - Determination of the characteristic heat flux for ignition from a non-contacting flame source
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60695-11-11 ®
Edition 1.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
BASIC SAFETY PUBLICATION
Fire hazard testing –
Part 11-11: Test flames – Determination of the characteristic heat flux for ignition
from a non-contacting flame source

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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(IEV) online.
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need further assistance, please contact the Customer Service
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IEC 60695-11-11 ®
Edition 1.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
BASIC SAFETY PUBLICATION
Fire hazard testing –
Part 11-11: Test flames – Determination of the characteristic heat flux for ignition

from a non-contacting flame source

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40; 29.020 ISBN 978-2-8322-9835-0

– 2 – IEC 60695-11-11:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Principle of the test . 9
5 Apparatus . 9
5.1 Test arrangement . 9
5.2 Burner and test flame . 11
5.3 Heat flux meter . 11
5.4 Data acquisition system . 11
5.5 Heat flux meter mounting board . 11
5.6 Masking board . 12
5.7 Timing device . 12
5.8 Conditioning chamber . 12
5.9 Test specimen support . 12
5.10 Burner support . 12
5.11 Observation mirror . 13
5.12 Flow controller . 13
5.13 Heat flux meter supporting device . 13
6 Test specimen . 13
6.1 Dimensions of test specimen . 13
6.2 Testing ranges in formulations . 14
6.2.1 General . 14
6.2.2 Density, melt flows and filler/reinforcement . 14
6.2.3 Colour . 14
6.3 Conditioning of test specimens . 14
7 Testing conditions . 14
8 Test procedure . 14
8.1 Determination of incident heat flux calibration curve . 14
8.2 Determination of ignition time. 15
8.3 Repetition of the test at different heat flux values . 16
9 Evaluation of test results . 16
9.1 Average ignition time t . 16
ig
9.2 Report format for CHFI . 16
9.3 Analysis on CHFI (optional) . 17

10 Precision data . 17
11 Test report . 17
Annex A (informative) An example of the calibration curve of incident heat flux, Q,
versus the distance, D, between the top of the burner tube and the lower surface of the
test specimen . 18
A.1 Calibration curve . 18
Annex B (informative) Examples of ignition times with various materials of 3 mm
thickness . 20
B.1 Materials – Examples of measurements . 20
Annex C (informative) Precision data . 23

C.1 General . 23
C.2 Heat flux versus distance at different gas flow rates . 23
C.3 Repeatability . 24
C.4 Calculations and plots . 25
Annex D (informative) Method of positioning the heat flux meter . 28
D.1 General . 28
D.2 Positioning the heat flux meter . 28
Bibliography . 30

Figure 1 – Arrangement and position of test specimen and burner . 10
Figure 2 – Heat flux meter mounting board . 11
Figure 3 – Structure of the masking board . 12
Figure 4 – Heat flux meter supporting device . 13
Figure A.1 – Calibration curve (example) . 18
Figure B.1 – Example of ignition times of PMMA . 20
Figure B.2 – Ignition times for ABS (example) . 21
Figure B.3 – Ignition times for HIPS (example) . 21
Figure C.1 – Incident heat flux calibration curve (gas flow rate 105 cm /min) . 23
Figure C.2 – Incident heat flux calibration curve (gas flow rate 160 cm /min) . 24
Figure C.3 – Plot of 1/ t for material A . 26
ig
Figure C.4 – Plot of 1/t for material B . 26
ig
Figure C.5 – Plot of 1/ t for material C . 27
ig
Figure C.6 – Plot of 1/ t for material D . 27
ig
Figure D.1 – Positioning the heat flux meter . 28
Figure D.2 – Correct position of the test specimen support and the heat flux meter. 29

Table A.1 – Calibration data (examples of actual measured data as shown
in Figure A.1) . 19
Table A.2 – Calibration data (examples of interpolated values) . 19
Table B.1 – Value of Figure B.1 . 20
Table B.2 – Value of Figure B.2 . 21
Table B.3 – Value of Figure B.3 . 22
Table B.4 – Description example of tabulated test results . 22
Table C.1 – Precision data of ignition time . 25

– 4 – IEC 60695-11-11:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 11-11: Test flames –
Determination of the characteristic heat flux
for ignition from a non-contacting flame source

FOREWORD
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...

IEC 60695-11-11 ®
Edition 1.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 11-11: Test flames – Determination of the characteristic heat flux for ignition
from a non-contacting flame source

Essais relatifs aux risques du feu –
Partie 11-11: Flammes d’essai – Détermination de la densité de flux de chaleur
caractéristique pour l'allumage à partir d'une flamme source sans contact

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
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Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 18 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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IEC 60695-11-11 ®
Edition 1.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Fire hazard testing –
Part 11-11: Test flames – Determination of the characteristic heat flux for

ignition from a non-contacting flame source

Essais relatifs aux risques du feu –

Partie 11-11: Flammes d’essai – Détermination de la densité de flux de chaleur

caractéristique pour l'allumage à partir d'une flamme source sans contact

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-1045-9

– 2 – IEC 60695-11-11:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Principle of the test . 9
5 Apparatus . 9
5.1 Test arrangement . 9
5.2 Burner and test flame . 11
5.3 Heat flux meter . 11
5.4 Data acquisition system . 11
5.5 Heat flux meter mounting board . 11
5.6 Masking board . 12
5.7 Timing device . 12
5.8 Conditioning chamber . 12
5.9 Test specimen support . 12
5.10 Burner support . 12
5.11 Observation mirror . 13
5.12 Flow controller . 13
5.13 Heat flux meter supporting device . 13
6 Test specimen . 13
6.1 Dimensions of test specimen . 13
6.2 Testing ranges in formulations . 14
6.2.1 General . 14
6.2.2 Density, melt flows and filler/reinforcement . 14
6.2.3 Colour . 14
6.3 Conditioning of test specimens . 14
7 Testing conditions . 14
8 Test procedure . 14
8.1 Determination of incident heat flux calibration curve . 14
8.2 Determination of ignition time. 15
8.3 Repetition of the test at different heat flux values . 16
9 Evaluation of test results . 16
9.1 Average ignition time . 16
t
ig
9.2 Report format for CHFI . 16
9.3 Analysis on CHFI (optional) . 17

10 Precision data . 17
11 Test report . 17
Annex A (informative) An example of the calibration curve of incident heat flux, Q,
versus the distance, D, between the top of the burner tube and the lower surface of the
test specimen . 18
A.1 Calibration curve . 18
Annex B (informative) Examples of ignition times with various materials of 3 mm
thickness . 20
B.1 Materials – Examples of measurements . 20
Annex C (informative) Precision data . 23

C.1 General . 23
C.2 Heat flux versus distance at different gas flow rates . 23
C.3 Repeatability . 24
C.4 Calculations and plots . 25
Annex D (informative) Method of positioning the heat flux meter . 28
D.1 General . 28
D.2 Positioning the heat flux meter . 28
Bibliography . 30

Figure 1 – Arrangement and position of test specimen and burner . 10
Figure 2 – Heat flux meter mounting board . 11
Figure 3 – Structure of the masking board . 12
Figure 4 – Heat flux meter supporting device . 13
Figure A.1 – Calibration curve (example) . 18
Figure B.1 – Example of ignition times of PMMA . 20
Figure B.2 – Ignition times for ABS (example) . 21
Figure B.3 – Ignition times for HIPS (example) . 21
Figure C.1 – Incident heat flux calibration curve (gas flow rate 105 cm /min) . 23
Figure C.2 – Incident heat flux calibration curve (gas flow rate 160 cm /min) . 24
Figure C.3 – Plot of 1/ t for material A . 26
ig
Figure C.4 – Plot of 1/t for material B . 26
ig
Figure C.5 – Plot of 1/ t for material C . 27
ig
Figure C.6 – Plot of 1/ t for material D . 27
ig
Figure D.1 – Positioni
...