IEC 60695-8-1:2008

IEC 60695-8-1
Edition 2.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 8-1: Heat release – General guidance

Essais relatifs aux risques du feu –
Partie 8-1: Dégagement de chaleur – Guide général

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IEC 60695-8-1
Edition 2.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 8-1: Heat release – General guidance

Essais relatifs aux risques du feu –
Partie 8-1: Dégagement de chaleur – Guide général

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 13.220.40; 29.020 ISBN 2-8318-9646-0

– 2 – 60695-8-1 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references.7
3 Terms and definitions .7
4 Principles of determining heat release.10
4.1 Complete combustion measured by the oxygen bomb calorimeter (ISO 1716) .10
4.2 Incomplete combustion .11
4.2.1 Measurement techniques .11
4.2.2 Heat release by oxygen consumption .11
4.2.3 Heat release by carbon dioxide generation .12
4.2.4 Heat release by increase of gas temperature.12
5 Parameters used to report heat release data.14
5.1 Heat of combustion (gross and net) .14
5.2 Heat release rate.14
5.3 Heat release.15
5.4 Heat release rate per unit area.15
5.5 Total heat release.16
5.6 Peak heat release rate.16
5.7 Time to peak heat release rate .16
5.8 Effective heat of combustion.16
5.8.1 Measurement and calculation.16
5.8.2 Examples.17
5.9 FIGRA index.18
5.10 ARHE and MARHE .19
6 Considerations for the selection of test methods .21
6.1 Ignition sources .21
6.2 Type of test specimen.21
6.3 Choice of conditions .21
6.4 Test apparatus .21
6.4.1 Small-scale fire test apparatus .21
6.4.2 Intermediate and large-scale fire test apparatus .22
6.4.3 Comparison between small-scale and intermediate/large-scale fire
test methods.22
7 Relevance of heat release data.22
7.1 Contribution to fire hazard.22
7.2 Secondary ignition and flame spread.22
7.3 Determination of self-propagating fire thresholds .22
7.4 Probability of reaching flash-over .23
7.5 Smoke and toxic gas production .23
7.6 The role of heat release testing in research and development .23

Bibliography .24

Figure 1 – Heat release rate (HRR) curve.15

60695-8-1 © IEC:2008 – 3 –
Figure 2 – Heat release (HR) curve .15
Figure 3 – Heat release rate (HRR*) per unit area curve .16
Figure 4 – Mass loss curve.17
Figure 5 – FIGRA curve derived from Figure 1.18
Figure 6 – Illustrative HRR curve .19
Figure 7 – FIGRA curve derived from Figure 6.19
Figure 8 – ARHE curve derived from Figure 1.20
Figure 9 – ARHE curve derived from Figure 6.20

Table 1 – Heat of combustion.13
-1
Table 1a – Relationship between heat of combustion expressed in units of kJ·g of fuel
-1
burned and kJ·g of oxygen consumed for a variety of fuels .13
-1
Table 1b – Relationship between heat of combustion expressed in units of kJ·g of fuel
-1
burned and kJ·g of oxygen consumed for a variety of insulating liquids .14

– 4 – 60695-8-1 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 8-1: Heat release –
General guidance
FOREWORD
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