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
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
IEC 60455-2:2023-07(en-fr)

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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




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 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

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IEC 60455-2:2023 © IEC 2023 – 3 –
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 . 23
6.5 Thermal properties . 23
6.5.1 Bond strength at elevated temperature . 23
6.5.2 Linear thermal expansion . 23
6.5.3 Thermal conductivity . 23
6.5.4 Glass transition . 24
6.5.5 Flammability . 24
6.5.6 Thermal shock . 24
6.5.7 Dry heat resistance of resins for cable accessories – Method of test . 24
6.5.8 Wet heat resistance of resins for cable accessories . 25
6.5.9 Loss of mass . 27
6.5.10 Temperature index . 28
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 . 29
6.6.4 Water vapour permeability . 29
6.7 Electrical properties . 29
6.7.1 Effect of water immersion on volume resistivity . 29
6.7.2 Dielectric dissipation factor (tan δ) and relative permittivity . 29
6.7.3 Break down voltage and electric strength . 29
6.7.4 Proof tracking index (PTI) . 31

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– 4 – IEC 60455-2:2023 © IEC 2023
6.7.5 Electrolytic corrosion . 31
Annex A (informative) Health and safety . 34
Bibliography . 35

Figure 1 – Examination grid . 18
Figure 2 – Position of examination grid on the specimen . 19
Figure 3 – Example of electrode arrangement for flexible cured compound . 32
Figure 4 – Example of electrode arrangement for rigid cured compound . 33

Table 1 – Condition of the top side. 20
Table 2 – Condition of the bottom side . 20
Table 3 – Condition of the interior . 20
Table 4 – Voids . 21

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IEC 60455-2:2023 © IEC 2023 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –

Part 2: Methods of test

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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IEC 60455-2 has been prepared by IEC technical committee 15: Solid electrical insulating
materials. It is an International Standard.
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.

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– 6 – IEC 60455-2:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
15/1006/FDIS 15/1015/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60455 series, published under the general title Resin based reactive
compounds used for electrical insulation, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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IEC 60455-2:2023 © IEC 2023 – 7 –
INTRODUCTION
This part of IEC 60455 is one of a series which deals with solvent-free resin based reactive
compounds and their components used for electrical insulation.
The series consists of three parts:
• Part 1: Definitions and general requirements;
• Part 2: Methods of test;
• Part 3: Specifications for individual materials.

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– 8 – IEC 60455-2:2023 © IEC 2023
RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –

Part 2: Methods of test



1 Scope
This part of IEC 60455 specifies methods of test to be used for testing resin based reactive
compounds, their components and cured compounds used for electrical insulation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
http://www.electropedia.org)
IEC 60068-2-10:2005, Environmental testing – Part 2-10: Tests – Test J and guidance: Mould
growth
IEC 60112:2020, Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
IEC 60216 (all parts), Electrical insulating materials – Thermal endurance properties
IEC 60243-1:2013, Electric strength of insulating materials – Test methods – Part 1: Tests at
power frequencies
IEC 60296:2020, Fluids for electrotechnical applications – Mineral insulating oils for electrical
equipment
IEC 60426:2007, Electrical insulating materials – Determination of electrolytic corrosion caused
by insulating materials – Test methods
IEC 60455-1:1998, Resin based reactive compounds used for electrical insulation – Part 1:
Definitions and general requirements
IEC 60455-3 (all parts), Resin based reactive compounds used for electrical insulation – Part 3:
Specifications for individual materials
IEC 60455-3-8:2021, Resin based reactive compounds used for electrical insulation – Part 3-8:
Specifications for individual materials – Resins for cable accessories
IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC 60814:1997, Insulating liquids – Oil-impregnated paper and pressboard – Determination of
water by automatic coulometric Karl Fischer titration

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IEC 60455-2:2023 © IEC 2023 – 9 –
IEC 61033:1991, Test methods for the determination of bond strength of impregnating agents
to an enamelled wire substrate
IEC 61099:2010, Insulating liquids – Specifications for unused synthetic organic esters for
electrical purposes
ISO 37:2011, Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain
properties
ISO 62:2008, Plastics – Determination of water absorption
ISO 75 (all parts), Plastics and ebonite – Determination of temperature of deflection under load
ISO 175:2010, Plastics – Methods of test for the determination of the effects of immersion in
liquid chemicals
ISO 178:2010, Plastics – Determination of flexural properties
ISO 179-1:2010, Plastics – Determination of Charpy impact properties – Part 1: Non-
instrumented impact test
ISO 179-2:1997, Plastics – Determination of Charpy impact properties – Part 2: Instrumented
impact test
ISO 291, Plastics – Standard atmospheres for conditioning and testing
ISO 306:2013, Plastics – Thermoplastic materials – Determination of Vicat softening
temperature (VST)
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 584:1982, Plastics – Unsaturated polyester resins – Determination of reactivity at
80 degrees C (conventional method)
ISO 604:2002, Plastics – Determination of compressive properties
ISO 868:2003, Plastics and ebonite – Determination of indentation hardness by means of a
durometer (Shore hardness)
ISO 1183-1:2019, Plastics – Methods for determining the density of non-cellular plastics –
Part 1: Immersion method, liquid pycnometer method and titration method
ISO 1513:2010, Paints and varnishes – Examination and preparation of test samples
ISO 1523:2002, Determination of flash point – Closed cup equilibrium method
ISO 1675:1985, Plastics – Liquid resins – Determination of density by the pycnometer method
ISO 2039-1:1993, Plastics – Determination of hardness – Part 1: Ball indentation method
ISO 2114:2000, Plastics (polyester resins) and paints and varnishes (binders) – Determination
of partial acid value and total acid value
ISO 2431:1993, Paints and varnishes – Determination of flow time by use of flow cups

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– 10 – IEC 60455-2:2023 © IEC 2023
ISO 2535:1997, Plastics – Unsaturated polyester resins – Measurement of gel time at
25 degrees C
ISO 2554:1997, Plastics – Unsaturated polyester resins – Determination of hydroxyl value
ISO 2555:1989, Plastics – Resins in the liquid state or as emulsions or dispersions –
Determination of apparent viscosity using a single cylinder type rotational viscometer method
ISO 2592:1973, Petroleum products – Determination of flash and
...