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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
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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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