IEC TR 60216-7-2:2024
(Main)Electrical insulating materials - Thermal endurance properties - Part 7-2: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) - Results of the round robin tests to validate procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of thermogravimetric data
Electrical insulating materials - Thermal endurance properties - Part 7-2: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) - Results of the round robin tests to validate procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of thermogravimetric data
IEC TR 60216-7-2:2024 is intended to validate the procedures of IEC TS 60216-7-1 in providing a similar temperature index to conventional methods used in other parts of the IEC 60216 series. The round robin test results do not provide statistical analysis for precision. The round robin test focuses on preliminary studies to understand the evaluation and calculation procedures, influence on apparatus, and data variance among laboratories before determination of precision. This second edition cancels and replaces the first edition published in 2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Annex A (informative) has been added to provide a round robin test with a different polymer type - polybuthylene terephthalate (PBY) - as an additional use case of the method in accordance with IEC TS 60216-7-1;
b) Tables 3 to 11 have been corrected by adding units, and texts have been refined for more technical clarifications of the procedures and observations.
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IEC TR 60216-7-2 ®
Edition 2.0 2024-09
TECHNICAL
REPORT
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to validate
procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of
thermogravimetric data
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.
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3, rue de Varembé info@iec.ch
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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IEC TR 60216-7-2 ®
Edition 2.0 2024-09
TECHNICAL
REPORT
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to validate
procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of
thermogravimetric data
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.020; 29.020; 29.035.01 ISBN 978-2-8322-9692-9
– 2 – IEC TR 60216-7-2:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Test specimens . 8
5 Test apparatus . 9
5.1 Thermogravimetric analyser (TGA) . 9
5.2 Purge gas supplied into the TGA furnace . 9
6 Test procedures . 10
6.1 General . 10
6.2 Preconditioning of test samples . 10
6.3 TGA tests with multiple heating rates . 10
6.4 Calculation of the activation energy (E ) . 10
a
6.5 Determination of thermal endurance using TGA . 11
6.5.1 General . 11
6.5.2 Determination of RTE by given degree of conversion from reference
A
material (Method A) . 11
6.5.3 Determination of TI by fixed degree of conversion at 0,05 (Method B) . 12
A
7 Round robin test results . 12
7.1 TGA test results . 12
7.2 Degree of conversion correlated to the activation energy from conventional
heat ageing data . 12
7.3 HIC determined by Method A and Method B . 13
A
7.4 RTE determined by Method A and TI by Method B. 14
A A
7.5 Difference between RTE and TI determined by the conventional heat
A
ageing tests . 16
8 Observations from the round robin test results . 18
8.1 General . 18
8.2 Sample weight variation . 18
8.3 Humidity and hydrolysis of the sample . 20
8.4 Considerations on repeatability of TGA curves . 20
8.5 Baseline drift and responsiveness to heating rates of TGA . 21
9 Conclusion . 25
Annex A (informative) Additional round robin studies with polybuthylene terephthalate . 26
A.1 Objectives . 26
A.2 Test specimens . 26
A.3 Test apparatus . 26
A.4 Test procedures . 27
A.5 Test results . 27
A.6 Observations . 32
Bibliography . 35
Figure 1 – Fitting curve of plots between degree of conversion and activation energy
determined by ISO 11358-2 [3] (example) . 11
Figure 2 – Correlation between the initial sample mass of sample A and the difference
of RTE (TI ) from TI . 19
A A
Figure 3 – Correlation between the initial sample mass of sample B and the difference
of RTE (TI ) from TI . 19
A A
Figure 4 – Overlay charts of TGA curves in multiple heating rates in multiple
laboratories (enlarged) . 22
Figure 5 – Logarithm plots for activation energy calculation . 23
Figure 6 – Fitting curves of degree of conversion versus activation energy by TGA . 24
Figure A.1 – Effect of sample amount on Ea (data provided by laboratory E) . 33
Figure A.2 – Summary of factors affecting the TGA kinetic study for determination of
RTE and TI . 34
A A
Table 1 – Heat ageing properties of the test specimens by the conventional procedure
described in IEC 60216-5 [4] . 9
Table 2 – Degree of conversion identical to the activation energy of the conventional
heat ageing . 13
Table 3 – HIC determined by Method A and Method B for dielectric strength . 13
A
Table 4 – HIC determined by Method A and Method B for tensile strength . 14
A
Table 5 – HIC determined by Method A and Method B for impact strength . 14
A
Table 6 – RTE determined by Method A and TI by Method B for dielectric strength . 15
A A
Table 7 – RTE determined by Method A and TI by Method B for tensile strength . 15
A A
Table 8 – RTE determined by Method A and TI by Method B for impact strength . 16
A A
Table 9 – Difference between RTE or TI , and TI for dielectric strength . 16
A A
Table 10 – Difference between RTE or TI , and TI for tensile strength . 17
A A
Table 11 – Difference between RTE or TI , and TI for impact strength . 17
A A
Table 12 – Comparison of degree of conversion with original or rerun data at 8 K/min . 21
Table A.1 – Heat ageing properties of the PBT test specimens by the conventional
procedure in accordance with IEC 60216-5 [4] . 26
Table A.2 – Degrees of conversion at the activation energy identical to that from
conventional heat ageing . 27
Table A.3 – HIC determined by Method A and Method B for dielectric strength . 28
A
Table A.4 – HIC determined by Method A and Method B for tensile strength . 28
A
Table A.5 – HIC determined by Method A and Method B for impact strength . 29
A
Table A.6 – RTE determined by Method A and TI by Method B for dielectric strength . 29
A A
Table A.7 – RTE determined by Method A and TI by Method B for tensile strength . 30
A A
Table A.8 – RTE determined by Method A and TI by Method B for impact strength . 30
A A
Table A.9 – Difference between RTE or TI , and TI for dielectric strength . 31
A A
Table A.10 – Difference between RTE or TI , and TI for tensile strength . 31
A A
Table A.11 – Difference between RTE or TI , and TI for impact strength . 32
A A
– 4 – IEC TR 60216-7-2:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to
validate procedures of IEC TS 60216-7-1 by non-isothermal kinetic
analysis of thermogravimetric data
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 international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations
...
IEC TR 60216-7-2 ®
Edition 2.0 2024-09
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to validate
procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of
thermogravimetric data
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 Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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.
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 Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.
IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TR 60216-7-2 ®
Edition 2.0 2024-09
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Electrical insulating materials – Thermal endurance properties –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to validate
procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of
thermogravimetric data
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.020; 29.020; 29.035.01 ISBN 978-2-8322-9761-2
– 2 – IEC TR 60216-7-2:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Test specimens . 8
5 Test apparatus . 9
5.1 Thermogravimetric analyser (TGA) . 9
5.2 Purge gas supplied into the TGA furnace . 9
6 Test procedures . 10
6.1 General . 10
6.2 Preconditioning of test samples . 10
6.3 TGA tests with multiple heating rates . 10
6.4 Calculation of the activation energy (E ) . 10
a
6.5 Determination of thermal endurance using TGA . 11
6.5.1 General . 11
6.5.2 Determination of RTE by given degree of conversion from reference
A
material (Method A) . 11
6.5.3 Determination of TI by fixed degree of conversion at 0,05 (Method B) . 12
A
7 Round robin test results . 12
7.1 TGA test results . 12
7.2 Degree of conversion correlated to the activation energy from conventional
heat ageing data . 12
7.3 HIC determined by Method A and Method B . 13
A
7.4 RTE determined by Method A and TI by Method B. 14
A A
7.5 Difference between RTE and TI determined by the conventional heat
A
ageing tests . 16
8 Observations from the round robin test results . 18
8.1 General . 18
8.2 Sample weight variation . 18
8.3 Humidity and hydrolysis of the sample . 20
8.4 Considerations on repeatability of TGA curves . 20
8.5 Baseline drift and responsiveness to heating rates of TGA . 21
9 Conclusion and recommendation . 25
Annex A (informative) Additional round robin studies with polybuthylene terephthalate . 26
A.1 Objectives . 26
A.2 Test specimens . 26
A.3 Test apparatus . 26
A.4 Test procedures . 27
A.5 Test results . 27
A.6 Observations . 32
Bibliography . 35
Figure 1 – Fitting curve of plots between degree of conversion and activation energy
determined by ISO 11358-2 [3] (example) . 11
Figure 2 – Correlation between the initial sample mass of sample A and the difference
of RTE (TI ) from TI . 19
A A
Figure 3 – Correlation between the initial sample mass of sample B and the difference
of RTE (TI ) from TI . 19
A A
Figure 4 – Overlay charts of TGA curves in multiple heating rates in multiple
laboratories (enlarged) . 22
Figure 5 – Logarithm plots for activation energy calculation . 23
Figure 6 – Fitting curves of degree of conversion versus activation energy by TGA . 24
Figure A.1 – Effect of sample amount on Ea (data provided by laboratory E) . 33
Figure A.2 – Summary of factors affecting the TGA kinetic study for determination of
RTE and TI . 34
A A
Table 1 – Heat ageing properties of the test specimens by the conventional procedure
described in IEC 60216-5 [4] . 9
Table 2 – Degree of conversion identical to the activation energy of the conventional
heat ageing . 13
Table 3 – HIC determined by Method A and Method B for dielectric strength . 13
A
Table 4 – HIC determined by Method A and Method B for tensile strength . 14
A
Table 5 – HIC determined by Method A and Method B for impact strength . 14
A
Table 6 – RTE determined by Method A and TI by Method B for dielectric strength . 15
A A
Table 7 – RTE determined by Method A and TI by Method B for tensile strength . 15
A A
Table 8 – RTE determined by Method A and TI by Method B for impact strength . 16
A A
Table 9 – Difference between RTE or TI , and TI for dielectric strength . 16
A A
Table 10 – Difference between RTE or TI , and TI for tensile strength . 17
A A
Table 11 – Difference between RTE or TI , and TI for impact strength . 17
A A
Table 12 – Comparison of degree of conversion with original or rerun data at 8 K/min . 21
Table A.1 – Heat ageing properties of the PBT test specimens by the conventional
procedure in accordance with IEC 60216-5 [4] . 26
Table A.2 – Degrees of conversion at the activation energy identical to that from
conventional heat ageing . 27
Table A.3 – HIC determined by Method A and Method B for dielectric strength . 28
A
Table A.4 – HIC determined by Method A and Method B for tensile strength . 28
A
Table A.5 – HIC determined by Method A and Method B for impact strength . 29
A
Table A.6 – RTE determined by Method A and TI by Method B for dielectric strength . 29
A A
Table A.7 – RTE determined by Method A and TI by Method B for tensile strength . 30
A A
Table A.8 – RTE determined by Method A and TI by Method B for impact strength . 30
A A
Table A.9 – Difference between RTE or TI , and TI for dielectric strength . 31
A A
Table A.10 – Difference between RTE or TI , and TI for tensile strength . 31
A A
Table A.11 – Difference between RTE or TI , and TI for impact strength . 32
A A
– 4 – IEC TR 60216-7-2:2024 RLV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –
Part 7-2: Accelerated determination of relative thermal endurance using
analytical test methods (RTEA) – Results of the round robin tests to
validate procedures of IEC TS 60216-7-1 by non-isothermal kinetic
analysis of thermogravimetric data
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 international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable effort
...
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