IEC 60455-2:2023

Resin based reactive compounds used for electrical insulation - Part 2: Methods of test

IEC 60455-2:2023 is available as IEC 60455-2:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60455-2:2023 specifies methods of test to be used for testing resin based reactive compounds, their components and cured compounds used for electrical insulation. This fourth edition cancels and replaces the third edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Introduction of test methods related to IEC 60455-3-8;
b) Additional and updated test methods for resins.

Composés réactifs à base de résines utilisés comme isolants électriques - Partie 2: Méthodes d'essai

IEC 60455-2:2023 est disponible sous forme de IEC 60455-2:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60455-2:2023 spécifie les méthodes d'essai à utiliser pour vérifier les composés réactifs à base de résines, leurs composants et les composés durcis, utilisés pour l'isolation électrique. Cette quatrième édition annule et remplace la troisième édition parue en 2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) introduction des méthodes d'essai de l'IEC 60455-3-8;
b) ajout et mise à jour des méthodes d'essai pour les résines.

General Information

• Status: Published
• Publication Date: 26-Jul-2023
• ICS: 17.220.99 - Other standards related to electricity and magnetism
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 15 - Solid electrical insulating materials
• Drafting Committee: WG 7 - TC 15/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2023
• Completion Date: 27-Jul-2023

Relations

• Revises: IEC 60455-2:2015 - Resin based reactive compounds used for electrical insulation - Part 2: Methods of test
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60455-2 ®
Edition 4.0 2023-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resin based reactive compounds used for electrical insulation –
Part 2: Methods of test
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.: [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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IEC 60455-2 ®
Edition 4.0 2023-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resin based reactive compounds used for electrical insulation –
Part 2: Methods of test
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.99, 29.035.01 ISBN 978-2-8322-7342-5

– 2 – IEC 60455-2:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 11
4 General notes on methods of test . 11
4.1 Preparation and conditioning. 11
4.2 Sequence of tests . 12
4.3 Test report . 12
5 Methods of test for reactive compounds and their components . 12
5.1 Flash point . 12
5.2 Density . 12
5.3 Viscosity . 12
5.4 Viscosity after storing at elevated temperature . 12
5.5 Content of volatile organic components . 13
5.6 Isothermal increase of viscosity (processing time) . 13
5.7 Shelf life . 13
5.8 Colour . 14
5.9 Softening temperature . 14
5.10 Ash content . 14
5.11 Filler content . 14
5.12 Chlorine content. 14
5.12.1 Total chlorine content of unsaturated polyesters and epoxide resins . 14
5.12.2 Inorganic chlorine content of epoxide resins and glycidyl esters . 14
5.12.3 Easily saponifiable chlorine content of epoxide resins and related
materials . 14
5.13 Tendency of crystallisation . 14
5.14 Epoxide equivalent of epoxide resins . 14
5.15 Content of isocyanate . 14
5.16 Water content (Karl Fischer method) . 15
5.17 Hydroxyl value . 15
5.17.1 Polyester resins . 15
5.17.2 Resins other than polyester . 15
5.18 Acid value of polyester resins . 15
5.19 Amount of double bonds of unsaturated polyester and acrylate resins . 15
5.20 Acid and acid-anhydride content of acid-anhydride hardeners . 15
5.21 Amine value . 15
5.22 Pot life . 15
5.22.1 General . 15
5.22.2 Resinous compounds for cable accessories . 15
5.23 Gel time . 16
5.23.1 Unsaturated polyester based compounds . 16
5.23.2 Phenolic resin based compounds . 16
5.23.3 Other compounds . 16
5.24 Exothermic temperature rise . 16
5.24.1 Unsaturated polyester based compounds . 16
5.24.2 Resinous compounds for cable accessories . 16

5.24.3 Other compounds .
5.25 Total volume shrinkage of epoxide and unsaturated polyester based
compounds . 17
5.26 Curing in presence of water . 17
5.26.1 General . 17
5.26.2 Apparatus and materials . 17
5.26.3 Pouring device . 18
5.26.4 Procedure . 18
5.26.5 Test report . 18
5.27 Determination of the degree of curing . 19
5.28 Curing in thick layer and emissions during curing . 19
5.28.1 General . 20
5.28.2 Equipment . 20
5.28.3 Test specimen . 20
5.28.4 Procedure . 20
6 Methods of test for cured reactive compounds . 21
6.1 General . 22
6.2 Test specimens . 22
6.2.1 General . 22
6.2.2 Preparation of the reactive compound . 22
6.2.3 Preparation of test specimens. 22
6.2.4 Type and number of test specimens . 22
6.3 Density . 23
6.4 Mechanical properties . 23
6.4.1 Tensile properties . 23
6.4.2 Compressive properties . 23
6.4.3 Flexural properties . 23
6.4.4 Impact strength . 23
6.4.5 Hardness . 24
6.5 Thermal properties . 24
6.5.1 Bond strength at elevated temperature . 24
6.5.2 Linear thermal expansion . 24
6.5.3 Thermal conductivity . 24
6.5.4 Glass transition . 24
6.5.5 Flammability . 24
6.5.6 Thermal shock . 25
6.5.7 Dry heat resistance of resins for cable accessories – Method of test . 25
6.5.8 Wet heat resistance of resins for cable accessories . 26
6.5.9 Loss of mass . 28
6.5.10 Temperature index . 29
6.6 Chemical properties . 29
6.6.1 Water absorption . 29
6.6.2 Effect of liquid chemicals . 29
6.6.3 Resistance to mould growth . 30
6.6.4 Water vapour permeability . 30
6.7 Electrical properties . 30
6.7.1 Effect of water immersion on volume resistivity . 30
6.7.2 Dielectric dissipation factor (tan δ) and relative permittivity . 30
6.7.3 Break down voltage and electric strength . 31

– 4 – IEC 60455-2:2023 RLV © IEC 2023
6.7.4 Proof tracking index (PTI) . 33
6.7.5 Electrolytic corrosion . 33
Annex A (
...

IEC 60455-2 ®
Edition 4.0 2023-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resin based reactive compounds used for electrical insulation –
Part 2: Methods of test
Composés réactifs à base de résines utilisés comme isolants électriques –
Partie 2: Méthodes d'essai
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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utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
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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. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
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IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
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IEC 60455-2 ®
Edition 4.0 2023-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resin based reactive compounds used for electrical insulation –

Part 2: Methods of test
Composés réactifs à base de résines utilisés comme isolants électriques –

Partie 2: Méthodes d'essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99, 29.035.01 ISBN 978-2-8322-7283-1

– 2 – IEC 60455-2:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 11
4 General notes on methods of test . 11
4.1 Preparation and conditioning. 11
4.2 Sequence of tests . 12
4.3 Test report . 12
5 Methods of test for reactive compounds and their components . 12
5.1 Flash point . 12
5.2 Density . 12
5.3 Viscosity . 12
5.4 Viscosity after storing at elevated temperature . 12
5.5 Content of volatile organic components . 13
5.6 Isothermal increase of viscosity (processing time) . 13
5.7 Shelf life . 13
5.8 Colour . 13
5.9 Softening temperature . 14
5.10 Ash content . 14
5.11 Filler content . 14
5.12 Chlorine content. 14
5.12.1 Total chlorine content of unsaturated polyesters and epoxide resins . 14
5.12.2 Inorganic chlorine content of epoxide resins and glycidyl esters . 14
5.12.3 Easily saponifiable chlorine content of epoxide resins and related
materials . 14
5.13 Tendency of crystallisation . 14
5.14 Epoxide equivalent of epoxide resins . 14
5.15 Content of isocyanate . 14
5.16 Water content (Karl Fischer method) . 14
5.17 Hydroxyl value . 15
5.17.1 Polyester resins . 15
5.17.2 Resins other than polyester . 15
5.18 Acid value of polyester resins . 15
5.19 Amount of double bonds of unsaturated polyester and acrylate resins . 15
5.20 Acid and acid-anhydride content of acid-anhydride hardeners . 15
5.21 Amine value . 15
5.22 Pot life . 15
5.22.1 General . 15
5.22.2 Resinous compounds for cable accessories . 15
5.23 Gel time . 16
5.23.1 Unsaturated polyester based compounds . 16
5.23.2 Phenolic resin based compounds . 16
5.23.3 Other compounds . 16
5.24 Exothermic temperature rise . 16
5.24.1 Unsaturated polyester based compounds . 16
5.24.2 Resinous compounds for cable accessories . 16

5.25 Total volume shrinkage of epoxide and unsaturated polyester based
compounds . 17
5.26 Curing in presence of water . 17
5.26.1 General . 17
5.26.2 Apparatus and materials . 17
5.26.3 Pouring device . 17
5.26.4 Procedure . 17
5.26.5 Test report . 18
5.27 Determination of the degree of curing . 19
5.28 Curing in thick layer and emissions during curing . 19
5.28.1 General . 19
5.28.2 Equipment . 20
5.28.3 Test specimen . 20
5.28.4 Procedure . 20
6 Methods of test for cured reactive compounds . 21
6.1 General . 21
6.2 Test specimens . 21
6.2.1 General . 21
6.2.2 Preparation of the reactive compound . 21
6.2.3 Preparation of test specimens. 22
6.2.4 Type and number of test specimens . 22
6.3 Density . 22
6.4 Mechanical properties . 22
6.4.1 Tensile properties . 22
6.4.2 Compressive properties . 22
6.4.3 Flexural properties . 23
6.4.4 Impact strength . 23
6.4.5 Hardness .
...