IEC 60455-3-8:2021
(Main)Resin based reactive compounds used for electrical insulation - Part 3-8: Specifications for individual materials - Resins for cable accessories
Resin based reactive compounds used for electrical insulation - Part 3-8: Specifications for individual materials - Resins for cable accessories
IEC 60455-3-8:2021 gives the requirements for resins for power cable accessories that conform to this specification and meet established levels of performance. However, the selection of a material by a user for a specific application will be based on the actual requirements necessary for adequate performance in that application and not on this specification alone. These materials are designed to be used in low and medium voltage cable accessories and as such, electrical performance is proven as part of the assembly. Examples of this are described in EN 50393 and IEC 60502-4. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Clause 1: a link to assemblies according to IEC 60502-4 and EN 50393 was introduced;
- designation: the categories, especially the mechanical ones, were redefined;
- type tests: the testing was updated based on the chemical basis of the material;
- type tests: additional materials were introduced;
- Annex A: an examination grid was established.
Composés réactifs à base de résines utilisés comme isolants électriques - Partie 3-8: Spécifications pour matériaux particuliers - Résines pour accessoires de câble
L'IEC 60455-3-8:2021 contient les exigences relatives aux résines pour accessoires de câble de puissance conformes à la présente spécification et satisfaisant aux niveaux de performances établis. Cependant, le choix d’un matériau, par un utilisateur, pour une application spécifique sera fondé sur les exigences réelles nécessaires pour une performance adéquate de cette application, et non fondé sur cette seule spécification. Ces matériaux sont conçus pour être utilisés avec des accessoires de câbles à basse et moyenne tension et, de fait, les performances électriques sont attestées en tant que partie intégrante de l’assemblage. Des exemples sont fournis dans l’EN 50393 et l’IEC 60502-4. Cette deuxième édition annule et remplace la première édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Article 1: un lien pour les assemblages conformément à l’IEC 60502-4 et à l’EN 50393 a été ajouté;
- désignation: les catégories, en particulier celles relatives à la mécanique, ont été redéfinies;
- essais de type: l’essai a été mis à jour en fonction de l’origine chimique du matériau;
- essais de type: des matériaux supplémentaires ont été ajoutés;
- Annexe A: une grille d’évaluation a été créée.
General Information
Relations
Standards Content (Sample)
IEC 60455-3-8 ®
Edition 2.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resin based reactive compounds used for electrical insulation –
Part 3-8: Specifications for individual materials – Resins for cable accessories
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 Central Office 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 online collection - oc.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
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
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 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once 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: sales@iec.ch.
IEC 60455-3-8 ®
Edition 2.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resin based reactive compounds used for electrical insulation –
Part 3-8: Specifications for individual materials – Resins for cable accessories
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.035.01 ISBN 978-2-8322-9916-6
– 2 – IEC 60455-3-8:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Designation . 7
5 Type testing . 8
5.1 General . 8
5.2 Sampling. 9
5.3 Preparation and conditioning. 9
5.3.1 General . 9
5.3.2 Individual components prior to mixing . 9
5.3.3 Resin just after mixing (curing stage) . 9
5.3.4 Cured resin (original) . 9
5.3.5 Cured resin after thermal ageing (dry and wet) . 9
5.4 Sequence of tests . 9
5.5 Test report . 10
6 Test methods . 10
7 Information on supply, packaging, marking and labelling . 19
7.1 Packaging . 19
7.2 Marking and labelling . 19
7.2.1 General . 19
7.2.2 Components . 19
7.2.3 Accessory kit . 19
Annex A (normative) Examination grid . 20
Bibliography . 21
Figure A.1 – Examination grid . 20
Figure A.2 – Position of examination grid on the specimen . 20
Table 1 – Categories of resins . 8
Table 2 – Type tests: test methods and requirements for Polyurethane resins . 11
Table 3 – Type tests: test methods and requirements for Polybutadiene resins . 15
Table 4 – Type tests: test methods and requirements for Epoxy resins . 16
Table 5 – Type tests: test methods and requirements for Silicone resins. 18
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –
Part 3-8: Specifications for individual materials –
Resins for cable accessories
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 efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60455-3-8:2013. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC 60455-3-8:2021 RLV © IEC 2021
International Standard IEC 60455-3-8 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1: a link to assemblies according to IEC 60502-4 and EN 50393 was introduced;
b) designation: the categories, especially the mechanical ones, were redefined;
c) type tests: the testing was updated based on the chemical basis of the material;
d) type tests: additional materials were introduced;
e) Annex A: an examination grid was established.
The text of this International Standard is based on the following documents:
FDIS Report on voting
15/937/FDIS 15/941/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/standardsdev/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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
INTRODUCTION
This part of IEC 60455 is one of a series which deals with specifications for reactive compounds
and their components for electrical insulation. This series consists of three parts:
Part 1: Definitions and general requirements (IEC 60455-1);
Part 2: Methods of test (IEC 60455-2);
Part 3: Specifications for individual materials (IEC 60455-3)
IEC 60455-3-8 is one of the specification sheets comprising Part 3 as follows:
Sheet 8: Resins for cable accessories
– 6 – IEC 60455-3-8:2021 RLV © IEC 2021
RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –
Part 3-8: Specifications for individual materials –
Resins for cable accessories
1 Scope
This part of IEC 60455 gives the requirements for resins for power cable accessories that
conform to this specification and meet established levels of performance. However, the
selection of a material by a user for a specific application should will be based on the actual
requirements necessary for adequate performance in that application and not on this
specification alone.
These materials are designed to be used in low and medium voltage cable accessories and as
such, electrical performance is proven as part of the assembly. Examples of this are described
in EN 50393 and IEC 60502-4.
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 60093, Methods of test for volume resistivity and surface resistivity of solid electrical
insulating materials
IEC 60212, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60243-1, Electric strength of insulating materials – Test methods – Part 1: Tests at power
frequencies
IEC 60250, Recommended methods for the determination of the permittivity and dielectric
dissipation factor of electrical insulating materials at power, audio and radio frequencies
including metre wavelengths
IEC 60455-2:2015, Resin based reactive compounds used for electrical insulation – Part 2:
Methods of test
IEC 62631-2-1, Dielectric and resistive properties of solid insulating materials – Part 2-1:
Relative permittivity and dissipation factor – Technical Frequencies (0,1 Hz – 10 MHz) – AC
Methods
IEC 62631-3-1, Dielectric and resistive properties of solid insulating materials – Part 3-1:
Determination of resistive properties (DC methods) – Volume resistance and volume resistivity
– General method
—————————
Third edition to be published.
IEC 62631-3-2, Dielectric and resistive properties of solid insulating materials – Part 3-2:
Determination of resistive properties (DC methods) – Surface resistance and surface resistivity
ISO 179 (all parts), Plastics – Determination of Charpy impact properties
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 868, Plastics and ebonite – Determination of indentation hardness by means of a durometer
(Shore hardness)
ISO 1183-1, Plastics – Methods for determining the density of non-cellular plastics – Part 1:
Immersion method, liquid pycnometer method and titration method
ISO 2137, Petroleum products and lubricants – Determination of cone penetration of lubricating
greases and petrolatum
ISO 2555, Plastics — Resins in the liquid state or as emulsions or dispersions — Determination
of apparent viscosity by the Brookfield Test using a single cylinder type rotational viscometer
method
ISO 4895, Plastics – Liquid epoxy resins – Determination of tendency to crystallize
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
tendency to crystallization
measurement of the ability of epoxy based resin not to change from a liquid to a solid state at
a certain temperature close to water freezing point for a fixed time
3.2
type test
test made on materials or components of a cable accessory in order to demonstrate satisfactory
performance characteristics to meet the intended application
3.3
outer protection
cured resinous compound to protect the connections from damage by external mechanical
forces
4 Designation
Resins for cable accessories are classified in categories according to their application as
follows (see Table 1):
– 8 – IEC 60455-3-8:2021 RLV © IEC 2021
Table 1 – Categories of resins
Voltage Class Function Characteristic
Low Voltage (L) Outer Protection (OP) Cures in presence of
a
water (W)
Medium Voltage (M) Insulation (I)
a
Low foaming during curing when in contact with water as described in the
subclause dealing with curing under water in IEC 60455-2.
Voltage class Mechanical Characteristic
classification
Low voltage (L) Rigid (R)
Suitable for applications in
Soft (S)
a
presence of water (W)
Medium voltage (M)
Gel-like (G)
a
Low foaming during curing when in contact with water as described in
IEC 60455-2:2015, 5.26.
A resin is identified by a combination of categories.
For example: Low voltage compound for outer protection: L-OP;
Low voltage compound for insulation, curing in presence of water: L-I-W;
Low voltage compound for insulation and mechanical protection: L-OP-I.
For the purposes of this document:
– rigid is defined as Shore D > 30, the material has self-supporting properties,
– soft is defined as Shore D ≤ 30 and Shore A ≥ 10,
– gel-like is defined as Shore A < 10.
A resin is identified by a combination of categories, for example:
• low voltage compound – soft: L-S
• low voltage compound – rigid, suitable for application in presence of water: L-R-W
Resins without specific information about application temperature are suitable for applications
between 5 °C and 40 °C. Otherwise the application temperature shall be stated by the
manufacturer on the packaging.
Tests for type testing are carried out in accordance with each of the resin categories.
Low voltage: 0,6/1,0 (1,2) kV
Medium voltage: 20,8/36 (42) kV
5 Type testing
5.1 General
Tests shall be carried out based on the category of the resins as defined in Table 1. These tests
are of such nature that, once successfully completed, they need not to be repeated unless
changes are made in the material, component formulation or manufacturing process, which
might change the performance characteristics.
5.2 Sampling
Samples for type testing shall be taken from material stored under conditions prescribed
specified by the manufacturer. The type testing of resins shall be carried out either:
– as a stand-alone test. Samples used for the type test shall be taken from material available
as agreed between supplier and user, or
– in combination with an accessory type test. Samples used for the resins type test shall be
taken from the same batch as used in the accessory type test. In the event that no material
from the same batch is available, then the samples used for the resins type test shall be
taken from material available as agreed between supplier and user.
5.3 Preparation and conditioning
5.3.1 General
For all tests, unless otherwise specified, conditioning shall be made in accordance with
IEC 60212 using standard atmosphere B.
5.3.2 Individual components prior to mixing
Components (resin and reactive component) shall be individually prepared, conditioned and
tested in accordance with the relevant test method as specified in stage 1 of the sequence of
tests given in Table 2 to Table 5. Filler, when supplied as a separate item, shall not be tested
as a component.
5.3.3 Resin just after mixing (curing stage)
Compounds shall be prepared and mixed according to the supplier’s instructions and tested as
specified in stage 2 of the sequence of tests specified in Table 2 to Table 5.
5.3.4 Cured resin (original)
Compounds shall be prepared according to the supplier’s instructions and cured for 24 h at
room temperature unless otherwise specified in the test method referred to in stage 3 of the
sequence of tests given in Table 2 to Table 5. The specimens shall be post-cured at (80 ± 2) °C
for 24 h unless otherwise specified in the test method, and then cooled in a desiccator for 24 h
at room temperature.
NOTE If degassing is needed, it will be indicated in the relevant test method and the conditions for the degassing
will also be indicated.
5.3.5 Cured resin after thermal ageing (dry and wet)
Cured resin shall be prepared according to the supplier’s instructions and cured for 24 h at
room temperature unless otherwise specified in the test method referred to in stage 4 of the
sequence of tests given in Table 2 to Table 5. The specimens shall be post-cured at (80 ± 2) °C
for 24 h unless otherwise specified in the test method, and then cooled in a desiccator for 24 h
at room temperature.
NOTE If degassing is needed, it will be indicated in the relevant test method and the conditions for the degassing
will also be indicated.
5.4 Sequence of tests
Tests shall be carried out on the resin in the following four stages, in accordance with Table 2
to Table 5:
stage 1: Reactive components prior to mixing;
stage 2: Resin just after mixing (curing stage);
stage 3: Cured resin (original);
– 10 – IEC 60455-3-8:2021 RLV © IEC 2021
stage 4: Cured resin after heat exposure (dry and wet).
5.5 Test report
The test report shall include the following data:
1) resin category and identification;
2) lot number or identification;
3) marking and labelling according to the material safety data sheet (MSDS);
4) test results;
5) major test parameters, including conditioning and calibration, if any;
6) processing conditions used to mix the compound;
7) copy of the technical data sheet (TDS) and MSDS.
6 Test methods
International test methods are specified within this document where available; for those tests
where there is no international test method available or the test method needs some adaptation
of conditions, the method or specific conditions are specified in IEC 60455-2.
For special applications, water temperature in Table 2 to Table 5, stage 4-2 (Wet heat
resistance), may can be insufficient to ensure the satisfactory performance of the resinous
compound. In such cases, upon agreement between manufacturer and user, the compound
shall be tested using an increased temperature of 90 °C. The chosen temperature shall be
recorded in the test report.
Compliance at 90 °C also includes compliance at 70 °C.
Table 2 – Type tests: test methods and requirements for Polyurethane resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
1 Viscosity at 5 °C ISO 2555 Pas ≤ 50
2 Tendency to crystallization ISO 4895 - No turbidity after 7 days Epoxy resin part only.
Stage 2 – Resins just after mixing (curing stage)
3 Pot life (0,3 l at 5 °C) IEC 60455-2 min
< 75
Pot life (0,3 l at 40 °C) min
≥ 5
4 Curing in presence of water, gas volume IEC 60455-2 ml < 10 For PUR resin type W only.
Curing in presence of water, physical structure Include picture of cut resin surface
No blisters or cracks, small amount
with scale in report.
of individual bubbles or inclusions
acceptable.
Stage 3 – Cured resins (original)
3 3
5 Density ISO 1183-1 Record value
g/cm Density should be > 1,05 g/cm
6 Impact strength (without notch) ISO 179 ≥ 6 No break is also acceptable.
kJ/m
7 Hardness (Shore) ISO 868 Record value
8 Tensile strength ISO 527 MPa Record value
9 Elongation at break ISO 527 % Record value
a
10 IEC 60250 MI: dissipation factor ≤ 0,1 Using conductive silver varnish as
Dissipation factor at room temperature
electrode material
Using 500 V/mm at 50 Hz
a
11 IEC 60250 Using conductive silver varnish as
Dielectric constant at room temperature MI: relative permittivity ≤ 6
electrode material
Using 500 V/mm at 50 Hz
a 13
12 IEC 60093 Ω cm Using conductive silver varnish as
Volume resistivity at room temperature MI: ≥ 1 × 10
electrode material
LI: ≥ 1 × 10
Using 500 V/mm at 50 Hz
a
According IEC 60212 atmosphere B.
– 12 – IEC 60455-3-8:2021 RLV © IEC 2021
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven ) – IEC 60455-2
13 Mass loss IEC 60455-2 %
≤ 5
14 Impact strength (without notch) ISO 179 ≥ 4 No break is also acceptable.
kJ/m
b
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2
15 Hardness (retention/original) ISO 868 % ≥ 80
16 Tensile strength (retention/original) ISO 527 %
≥ 65
17 Elongation at break (retention/original) ISO 527 %
≥ 65
18 Dielectric strength (resin type LI) IEC 60243-1 kV/mm ≥ 2 For resin type I only.
Dielectric strength (resin type MI)
≥ 5
b
See also Clause 6 regarding test at 90 °C.
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Resin only
ISO 2555
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
3 Curing in presence of water, physical structure IEC 60455-2 No blisters or cracks, small amount For PUR resin type W only. See
of individual bubbles or inclusions Annex A
acceptable
Include picture of cut resin surface
with scale in report
Stage 3 – Cured resins (original)
3 3
4 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
5 Impact strength (without notch) ISO 179 (all parts) ≥ 6 No break is also acceptable
kJ/m
6 Hardness (Shore) ISO 868 For classification purpose See Clause 4
7 Tensile strength ISO 527 (all parts) MPa Record value
8 Elongation at break ISO 527 (all parts) % Record value
a
9 IEC 62631-2-1 M: dissipation factor ≤ 0,1 Using conductive silver varnish as
Dissipation factor at room temperature
electrode material
Using 500 V/mm at 50 Hz
a
10 IEC 62631-2-1 M: relative permittivity ≤ 6 Using conductive silver varnish as
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
Using conductive silver varnish as
11 IIEC 62631-3-1 and Ω cm
Volume resistivity at room temperature M: ≥ 1 × 10
IEC 62631-3-2 electrode material
L: ≥ 1 × 10
Using 500 V/mm at 50 Hz
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
– 14 – IEC 60455-3-8:2021 RLV © IEC 2021
Number Property Test method Units Requirement Remarks
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven) – IEC 60455-2
12 Mass loss IEC 60455-2 % ≤ 5
13 Impact strength (without notch) ISO 179 (all parts) ≥ 4 No break is also acceptable
kJ/m
c
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2
14 Hardness (retention/original) ISO 868 % ≥ 80
15 Tensile strength (retention/original) ISO 527 (all parts) % ≥ 65
16 Elongation at break (retention/original) ISO 527 (all parts) % ≥ 65
17 Dielectric strength (resin type L) IEC 60243-1 kV/mm ≥ 2
Dielectric strength (resin type M) ≥ 5
c
See also Clause 6 regarding the test at 90 °C.
Table 3 – Type tests: test methods and requirements for Polybutadiene resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C; higher value is accepted when
mixing viscosity in stage 2.2 is
below 50 Pas
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
Stage 3 – Cured resins (original)
3 3
3 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
4 Hardness (Shore) ISO 868 For classification purpose See Clause 4
a
5 IEC 62631-2-1 M: dissipation factor ≤ 0,1 Using conductive silver varnish as
Dissipation factor at room temperature
electrode material
Using 500 V/mm at 50 Hz
a
6 IEC 62631-2-1 MI: relative permittivity ≤ 6 Using conductive silver varnish as
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
7 IEC 62631-3-1 and Using conductive silver varnish as
Volume resistivity at room temperature Ω cm M: ≥ 1 × 10
IEC 62631-3-2 electrode material
L: ≥ 1 × 10
Using 500 V/mm at 50 Hz
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 80 °C (vented oven) – IEC 60455-2
8 Mass loss IEC 60455-2 % ≤ 5
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2 Not relevant
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
– 16 – IEC 60455-3-8:2021 RLV © IEC 2021
Table 4 – Type tests: test methods and requirements for Epoxy resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C; higher value is accepted when
mixing viscosity in stage 2.3 is
below 50 Pas
2 Tendency to crystallization ISO 4895 - Keep class a for 10 days Diameter and height of glass tube
may deviate ±10 mm
Stage 2 – Resins just after mixing (curing stage)
3 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
4 Exotherm peak temperature at 23 °C IEC 60455-2 max. ≤ 165 °C
Stage 3 – Cured resins (original)
3 3
5 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
6 Impact strength (without notch) ISO 179 (all parts) ≥ 6 No break is also acceptable
kJ/m
7 Hardness (Shore) ISO 868 For classification purpose See Clause 4
8 Tensile strength ISO 527 (all parts) MPa Record value
9 Elongation at break ISO 527 (all parts) % Record value
a
10 IEC 62631-2-1 M: dissipation factor ≤ 0,1
Dissipation factor at room temperature
Using conductive silver varnish as
a
IEC 62631-2-1 MI: relative permittivity ≤ 6
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
12 IEC 62631-3-1 and Ω cm
Volume resistivity at room temperature M: ≥ 1 × 10
IEC 62631-3-2
L: ≥ 1 × 10
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
Number Property Test method Units Requirement Remarks
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven) – IEC 60455-2
13 Mass loss IEC 60455-2 % ≤ 5
14 Impact strength (without notch) ISO 179 (all parts) ≥ 4 No break is also acceptable
kJ/m
c
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2
15 Hardness (retention/original) ISO 868 % ≥ 80
16 Tensile strength (retention/original) ISO 527 (all parts) % ≥ 65
17 Elongation at break (retention/original) ISO 527 (all parts) % ≥ 65
18 Dielectric strength (resin type L) IEC 60243-1 kV/mm ≥ 2
Dielectric strength (resin type M) ≥ 5
c
See also Clause 6 regarding the test at 90 °C.
– 18 – IEC 60455-3-8:2021 RLV © IEC 2021
Table 5 – Type tests: test methods and requirements for Silicone resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at lowest application IEC 60455-2 min < 75
temperature)
min ≥ 5
Pot life (0,3 l at highest application
temperature)
Stage 3 – Cured resins (original)
3 3
3 Density ISO 1183-1 Only for category W
g/cm > 1,05 g/cm
4 Hardness (Shore) ISO 868 For classification purpose See Clause 4
5 PEN-hardness ISO 2137 1/10 mm Record value Only if Shore A ≤ 10
a
6 IEC 62631-2-1 M: dissipation factor ≤ 0,1
Dissipation factor at room temperature
Using conductive silver varnish as
a
7 IEC 62631-2-1 M: relative permittivity ≤ 6
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
8 IEC 62631-3-1 and
Ω cm
Volume resistivity at room temperature M: ≥ 1 × 10
IEC 62631-3-2
L: ≥ 1 × 10
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven ) – IEC 60455-2
9 Mass loss IEC 60455-2 % ≤ 5
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2 Not relevant
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
7 Information on supply, packaging, marking and labelling
7.1 Packaging
Packaging shall be sufficient to ensure that any stated shelf life of the reactive components is
maintained when stored under specified conditions of temperature and humidity.
7.2 Marking and labelling
7.2.1 General
The following information, in the relevant national language(s), shall be printed or labelled on
the resin components packaging and on the accessory kit.
7.2.2 Components
Each individual part of the resin or the reactive compounds if packed separately shall be printed
or labelled on its packaging with:
1) the supplier’s name or logo;
2) the part number or identification;
3) the lot number or production date;
4) the specified storage conditions, if any;
5) the “use before date” (shelf life);
6) the health and safety marking according to relevant EU or national legislation;
7) the mixing and application instructions
8) the resin categories.
7.2.3 Accessory kit
Each accessory kit containing a reactive component shall be printed or labelled on its packaging
and shall at least indicate:
1) the specified storage conditions, if any;
2) the “use before date” (shelf life);
3) the health and safety marking according to relevant EU or national legislation.
– 20 – IEC 60455-3-8:2021 RLV © IEC 2021
Annex A
(normative)
Examination grid
Evaluate the concentration and dimension of bubbles created by using an examination grid.
The grid measures 45 × 24 mm (width × height) and is made up of 15 cells of dimensions
9 mm × 8 mm (see Figure A.1):
Dimensions in millimetres
Figure A.1 – Examination grid
Position the grid centrally on the cut surface. To pass the examination no bubbles > 3 mm are
allowed and at least 5 cells shall be free of bubbles. Count only bubbles with a diameter ≥ 1 mm
(see Figure A.2).
Dimensions in millimetres
Figure A.2 – Position of examination grid on the specimen
Bibliography
IEC 60455-1, 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 60502-4, Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV) – Part 4: Test requirements on accessories
m m
for cables with rated voltages from 6 kV (U = 7,2 kV) up to 30 kV (U = 36 kV)
m m
IEC 61234-2, Electrical insulating materials – Methods of test for the hydrolytic stability – Part 2:
Moulded thermosets
ISO 291, Plastics – Standard atmospheres for conditioning and testing
ISO 2592, Petroleum and related products – Determination of flash and fire points – Cleveland
open cup method
ISO 3521, Plastics – Unsaturated polyester and epoxy resins – Determination of overall volume
shrinkage
ISO 7056, Plastics laboratory ware – Beakers
EN 50393, Test methods and requirements for accessories for use on distribution cables of
rated voltage 0,6/1,0 (1,2) kV
HD 629.1, Test requirements on accessories for use on power cables of rated voltage from
3,6/6(7,2) kV up to 20,8/36(42) kV – Part 1: Cables with extruded insulation
HD 629.2, Test requirements on accessories for use on power cables of rated voltage from
3,6/6(7,2) kV up to 20,8/36(42) kV – Part 2: Cables with impregnated paper insulation
___________
IEC 60455-3-8 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resin based reactive compounds used for electrical insulation –
Part 3-8: Specifications for individual materials – Resins for cable accessories
Composés réactifs à base de résines utilisés comme isolants électriques –
Partie 3-8: Spécifications pour matériaux particuliers – Résines pour
accessoires de câble
– 2 – IEC 60455-3-8:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Designation . 7
5 Type testing . 8
5.1 General . 8
5.2 Sampling. 8
5.3 Preparation and conditioning. 8
5.3.1 General . 8
5.3.2 Individual components prior to mixing . 8
5.3.3 Resin just after mixing (curing stage) . 8
5.3.4 Cured resin (original) . 9
5.3.5 Cured resin after thermal ageing (dry and wet) . 9
5.4 Sequence of tests . 9
5.5 Test report . 9
6 Test methods . 9
7 Information on supply, packaging, marking and labelling . 16
7.1 Packaging . 16
7.2 Marking and labelling . 16
7.2.1 General . 16
7.2.2 Components . 16
7.2.3 Accessory kit . 16
Annex A (normative) Examination grid . 17
Bibliography . 18
Figure A.1 – Examination grid . 17
Figure A.2 – Position of examination grid on the specimen . 17
Table 1 – Categories of resins . 7
...
IEC 60455-3-8 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resin based reactive compounds used for electrical insulation –
Part 3-8: Specifications for individual materials – Resins for cable accessories
Composés réactifs à base de résines utilisés comme isolants électriques –
Partie 3-8: Spécifications pour matériaux particuliers – Résines pour
accessoires de câble
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.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office 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 online collection - oc.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
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
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 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once 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: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - IEC online collection - oc.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 000 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
16 langues additionnelles. Egalement appelé Vocabulaire
Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60455-3-8 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resin based reactive compounds used for electrical insulation –
Part 3-8: Specifications for individual materials – Resins for cable accessories
Composés réactifs à base de résines utilisés comme isolants électriques –
Partie 3-8: Spécifications pour matériaux particuliers – Résines pour
accessoires de câble
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.01 ISBN 978-2-8322-9895-4
– 2 – IEC 60455-3-8:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Designation . 7
5 Type testing . 8
5.1 General . 8
5.2 Sampling. 8
5.3 Preparation and conditioning. 8
5.3.1 General . 8
5.3.2 Individual components prior to mixing . 8
5.3.3 Resin just after mixing (curing stage) . 8
5.3.4 Cured resin (original) . 9
5.3.5 Cured resin after thermal ageing (dry and wet) . 9
5.4 Sequence of tests . 9
5.5 Test report . 9
6 Test methods . 9
7 Information on supply, packaging, marking and labelling . 16
7.1 Packaging . 16
7.2 Marking and labelling . 16
7.2.1 General . 16
7.2.2 Components . 16
7.2.3 Accessory kit . 16
Annex A (normative) Examination grid . 17
Bibliography . 18
Figure A.1 – Examination grid . 17
Figure A.2 – Position of examination grid on the specimen . 17
Table 1 – Categories of resins . 7
Table 2 – Type tests: test methods and requirements for Polyurethane resins . 10
Table 3 – Type tests: test methods and requirements for Polybutadiene resins . 12
Table 4 – Type tests: test methods and requirements for Epoxy resins . 13
Table 5 – Type tests: test methods and requirements for Silicone resins. 15
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –
Part 3-8: Specifications for individual materials –
Resins for cable accessories
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 efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60455-3-8 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1: a link to assemblies according to IEC 60502-4 and EN 50393 was introduced;
b) designation: the categories, especially the mechanical ones, were redefined;
c) type tests: the testing was updated based on the chemical basis of the material;
d) type tests: additional materials were introduced;
e) Annex A: an examination grid was established.
– 4 – IEC 60455-3-8:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
15/937/FDIS 15/941/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/standardsdev/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.
INTRODUCTION
This part of IEC 60455 is one of a series which deals with specifications for reactive compounds
and their components for electrical insulation. This series consists of three parts:
Part 1: Definitions and general requirements (IEC 60455-1);
Part 2: Methods of test (IEC 60455-2);
Part 3: Specifications for individual materials (IEC 60455-3)
IEC 60455-3-8 is one of the specification sheets comprising Part 3 as follows:
Sheet 8: Resins for cable accessories
– 6 – IEC 60455-3-8:2021 © IEC 2021
RESIN BASED REACTIVE COMPOUNDS USED
FOR ELECTRICAL INSULATION –
Part 3-8: Specifications for individual materials –
Resins for cable accessories
1 Scope
This part of IEC 60455 gives the requirements for resins for power cable accessories that
conform to this specification and meet established levels of performance. However, the
selection of a material by a user for a specific application will be based on the actual
requirements necessary for adequate performance in that application and not on this
specification alone.
These materials are designed to be used in low and medium voltage cable accessories and as
such, electrical performance is proven as part of the assembly. Examples of this are described
in EN 50393 and IEC 60502-4.
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 60212, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60243-1, Electric strength of insulating materials – Test methods – Part 1: Tests at power
frequencies
IEC 60455-2:2015, Resin based reactive compounds used for electrical insulation – Part 2:
Methods of test
IEC 62631-2-1, Dielectric and resistive properties of solid insulating materials – Part 2-1:
Relative permittivity and dissipation factor – Technical Frequencies (0,1 Hz – 10 MHz) – AC
Methods
IEC 62631-3-1, Dielectric and resistive properties of solid insulating materials – Part 3-1:
Determination of resistive properties (DC methods) – Volume resistance and volume resistivity
– General method
IEC 62631-3-2, Dielectric and resistive properties of solid insulating materials – Part 3-2:
Determination of resistive properties (DC methods) – Surface resistance and surface resistivity
ISO 179 (all parts), Plastics – Determination of Charpy impact properties
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 868, Plastics and ebonite – Determination of indentation hardness by means of a durometer
(Shore hardness)
ISO 1183-1, Plastics – Methods for determining the density of non-cellular plastics – Part 1:
Immersion method, liquid pycnometer method and titration method
ISO 2137, Petroleum products and lubricants – Determination of cone penetration of lubricating
greases and petrolatum
ISO 2555, Plastics — Resins in the liquid state or as emulsions or dispersions — Determination
of apparent viscosity using a single cylinder type rotational viscometer method
ISO 4895, Plastics – Liquid epoxy resins – Determination of tendency to crystallize
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
tendency to crystallization
measurement of the ability of epoxy based resin not to change from a liquid to a solid state at
a certain temperature close to water freezing point for a fixed time
3.2
type test
test made on materials or components of a cable accessory in order to demonstrate satisfactory
performance characteristics to meet the intended application
4 Designation
Resins for cable accessories are classified in categories according to their application as
follows (see Table 1):
Table 1 – Categories of resins
Voltage class Mechanical Characteristic
classification
Low voltage (L) Rigid (R)
Suitable for applications in
Soft (S)
a
presence of water (W)
Medium voltage (M)
Gel-like (G)
a
Low foaming during curing when in contact with water as described in
IEC 60455-2:2015, 5.26.
For the purposes of this document:
– rigid is defined as Shore D > 30, the material has self-supporting properties,
– soft is defined as Shore D ≤ 30 and Shore A ≥ 10,
– gel-like is defined as Shore A < 10.
– 8 – IEC 60455-3-8:2021 © IEC 2021
A resin is identified by a combination of categories, for example:
• low voltage compound – soft: L-S
• low voltage compound – rigid, suitable for application in presence of water: L-R-W
Resins without specific information about application temperature are suitable for applications
between 5 °C and 40 °C. Otherwise the application temperature shall be stated by the
manufacturer on the packaging.
Tests for type testing are carried out in accordance with each of the resin categories.
Low voltage: 0,6/1,0 (1,2) kV
Medium voltage: 20,8/36 (42) kV
5 Type testing
5.1 General
Tests shall be carried out based on the category of the resins as defined in Table 1. These tests
are of such nature that, once successfully completed, they need not to be repeated unless
changes are made in the material, component formulation or manufacturing process, which
might change the performance characteristics.
5.2 Sampling
Samples for type testing shall be taken from material stored under conditions specified by the
manufacturer. The type testing of resins shall be carried out:
– as a stand-alone test. Samples used for the type test shall be taken from material available
as agreed between supplier and user, or
– in combination with an accessory type test. Samples used for the resins type test shall be
taken from the same batch as used in the accessory type test. In the event that no material
from the same batch is available, then the samples used for the resins type test shall be
taken from material available as agreed between supplier and user.
5.3 Preparation and conditioning
5.3.1 General
For all tests, unless otherwise specified, conditioning shall be made in accordance with
IEC 60212 using standard atmosphere B.
5.3.2 Individual components prior to mixing
Components (resin and reactive component) shall be individually prepared, conditioned and
tested in accordance with the relevant test method as specified in stage 1 of the sequence of
tests given in Table 2 to Table 5. Filler, when supplied as a separate item, shall not be tested
as a component
5.3.3 Resin just after mixing (curing stage)
Compounds shall be prepared and mixed according to the supplier’s instructions and tested as
specified in stage 2 of the sequence of tests specified in Table 2 to Table 5.
5.3.4 Cured resin (original)
Compounds shall be prepared according to the supplier’s instructions and cured for 24 h at
room temperature unless otherwise specified in the test method referred to in stage 3 of the
sequence of tests given in Table 2 to Table 5. The specimens shall be post-cured at (80 ± 2) °C
for 24 h unless otherwise specified in the test method, and then cooled in a desiccator for 24 h
at room temperature.
NOTE If degassing is needed, it will be indicated in the relevant test method and the conditions for the degassing
will also be indicated.
5.3.5 Cured resin after thermal ageing (dry and wet)
Cured resin shall be prepared according to the supplier’s instructions and cured for 24 h at
room temperature unless otherwise specified in the test method referred to in stage 4 of the
sequence of tests given in Table 2 to Table 5. The specimens shall be post-cured at (80 ± 2) °C
for 24 h unless otherwise specified in the test method, and then cooled in a desiccator for 24 h
at room temperature.
NOTE If degassing is needed, it will be indicated in the relevant test method and the conditions for the degassing
will also be indicated.
5.4 Sequence of tests
Tests shall be carried out on the resin in the following four stages, in accordance with Table 2
to Table 5:
stage 1: Reactive components prior to mixing;
stage 2: Resin just after mixing (curing stage);
stage 3: Cured resin (original);
stage 4: Cured resin after heat exposure (dry and wet).
5.5 Test report
The test report shall include the following data:
1) resin category and identification;
2) lot number or identification;
3) marking and labelling according to the material safety data sheet (MSDS);
4) test results;
5) major test parameters, including conditioning and calibration, if any;
6) processing conditions used to mix the compound;
7) copy of the technical data sheet (TDS) and MSDS.
6 Test methods
International test methods are specified within this document where available; for those tests
where there is no international test method available or the test method needs some adaptation
of conditions, the method or specific conditions are specified in IEC 60455-2.
For special applications, water temperature in Table 2 to Table 5, stage 4-2 (Wet heat
resistance), can be insufficient to ensure the satisfactory performance of the resinous
compound. In such cases, upon agreement between manufacturer and user, the compound
shall be tested using an increased temperature of 90 °C. The chosen temperature shall be
recorded in the test report.
Compliance at 90 °C also includes compliance at 70 °C.
– 10 – IEC 60455-3-8:2021 © IEC 2021
Table 2 – Type tests: test methods and requirements for Polyurethane resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Resin only
ISO 2555
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
3 Curing in presence of water, physical structure IEC 60455-2 No blisters or cracks, small amount For PUR resin type W only. See
of individual bubbles or inclusions Annex A
acceptable
Include picture of cut resin surface
with scale in report
Stage 3 – Cured resins (original)
3 3
4 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
5 Impact strength (without notch) ISO 179 (all parts) ≥ 6 No break is also acceptable
kJ/m
6 Hardness (Shore) ISO 868 For classification purpose See Clause 4
7 Tensile strength ISO 527 (all parts) MPa Record value
8 Elongation at break ISO 527 (all parts) % Record value
a
9 IEC 62631-2-1 M: dissipation factor ≤ 0,1 Using conductive silver varnish as
Dissipation factor at room temperature
electrode material
Using 500 V/mm at 50 Hz
a
10 IEC 62631-2-1 M: relative permittivity ≤ 6 Using conductive silver varnish as
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
11 IIEC 62631-3-1 and Using conductive silver varnish as
Volume resistivity at room temperature Ω cm M: ≥ 1 × 10
IEC 62631-3-2 11 electrode material
L: ≥ 1 × 10
Using 500 V/mm at 50 Hz
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
Number Property Test method Units Requirement Remarks
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven) – IEC 60455-2
12 Mass loss IEC 60455-2 % ≤ 5
13 Impact strength (without notch) ISO 179 (all parts) ≥ 4 No break is also acceptable
kJ/m
c
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2
14 Hardness (retention/original) ISO 868 % ≥ 80
15 Tensile strength (retention/original) ISO 527 (all parts) % ≥ 65
16 Elongation at break (retention/original) ISO 527 (all parts) % ≥ 65
17 Dielectric strength (resin type L) IEC 60243-1 kV/mm ≥ 2
Dielectric strength (resin type M) ≥ 5
c
See also Clause 6 regarding the test at 90 °C.
– 12 – IEC 60455-3-8:2021 © IEC 2021
Table 3 – Type tests: test methods and requirements for Polybutadiene resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C; higher value is accepted when
mixing viscosity in stage 2.2 is
below 50 Pas
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
Stage 3 – Cured resins (original)
3 3
3 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
4 Hardness (Shore) ISO 868 For classification purpose See Clause 4
a
5 IEC 62631-2-1 M: dissipation factor ≤ 0,1 Using conductive silver varnish as
Dissipation factor at room temperature
electrode material
Using 500 V/mm at 50 Hz
a
6 IEC 62631-2-1 MI: relative permittivity ≤ 6 Using conductive silver varnish as
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
7 IEC 62631-3-1 and Using conductive silver varnish as
Volume resistivity at room temperature Ω cm M: ≥ 1 × 10
IEC 62631-3-2 electrode material
L: ≥ 1 × 10
Using 500 V/mm at 50 Hz
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 80 °C (vented oven) – IEC 60455-2
8 Mass loss IEC 60455-2 % ≤ 5
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2 Not relevant
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
Table 4 – Type tests: test methods and requirements for Epoxy resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C; higher value is accepted when
mixing viscosity in stage 2.3 is
below 50 Pas
2 Tendency to crystallization ISO 4895 - Keep class a for 10 days Diameter and height of glass tube
may deviate ±10 mm
Stage 2 – Resins just after mixing (curing stage)
3 Pot life (0,3 l at 5 °C) IEC 60455-2 min < 75
Pot life (0,3 l at 40 °C) min ≥ 5
4 Exotherm peak temperature at 23 °C IEC 60455-2 max. ≤ 165 °C
Stage 3 – Cured resins (original)
3 3
5 Density ISO 1183-1 Only for category W
g/cm >1,05 g/cm
6 Impact strength (without notch) ISO 179 (all parts) ≥ 6 No break is also acceptable
kJ/m
7 Hardness (Shore) ISO 868 For classification purpose See Clause 4
8 Tensile strength ISO 527 (all parts) MPa Record value
9 Elongation at break ISO 527 (all parts) % Record value
a
10 IEC 62631-2-1 M: dissipation factor ≤ 0,1
Dissipation factor at room temperature
Using conductive silver varnish as
a
IEC 62631-2-1 MI: relative permittivity ≤ 6
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
12 IEC 62631-3-1 and Ω cm
Volume resistivity at room temperature M: ≥ 1 × 10
IEC 62631-3-2
L: ≥ 1 × 10
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
– 14 – IEC 60455-3-8:2021 © IEC 2021
Number Property Test method Units Requirement Remarks
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven) – IEC 60455-2
13 Mass loss IEC 60455-2 % ≤ 5
14 Impact strength (without notch) ISO 179 (all parts) ≥ 4 No break is also acceptable
kJ/m
c
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2
15 Hardness (retention/original) ISO 868 % ≥ 80
16 Tensile strength (retention/original) ISO 527 (all parts) % ≥ 65
17 Elongation at break (retention/original) ISO 527 (all parts) % ≥ 65
18 Dielectric strength (resin type L) IEC 60243-1 kV/mm ≥ 2
Dielectric strength (resin type M) ≥ 5
c
See also Clause 6 regarding the test at 90 °C.
Table 5 – Type tests: test methods and requirements for Silicone resins
Number Property Test method Units Requirement Remarks
Stage 1 – Reactive components prior to mixing
b
1 Viscosity at 5 °C Pa · s ≤ 50 Viscosity of both components at
ISO 2555
5 °C
Stage 2 – Resins just after mixing (curing stage)
2 Pot life (0,3 l at lowest application IEC 60455-2 min < 75
temperature)
min ≥ 5
Pot life (0,3 l at highest application
temperature)
Stage 3 – Cured resins (original)
3 3
3 Density ISO 1183-1 Only for category W
g/cm > 1,05 g/cm
4 Hardness (Shore) ISO 868 For classification purpose See Clause 4
5 PEN-hardness ISO 2137 1/10 mm Record value Only if Shore A ≤ 10
a
6 IEC 62631-2-1 M: dissipation factor ≤ 0,1
Dissipation factor at room temperature
Using conductive silver varnish as
a
7 IEC 62631-2-1 M: relative permittivity ≤ 6
Dielectric constant at room temperature
electrode material
Using 500 V/mm at 50 Hz
a 13
8 IEC 62631-3-1 and
Ω cm
Volume resistivity at room temperature M: ≥ 1 × 10
IEC 62631-3-2
L: ≥ 1 × 10
Stage 4 – Cured resins after heat exposure
4-1 Dry heat resistance: 28 days at 120 °C (vented oven ) – IEC 60455-2
9 Mass loss IEC 60455-2 % ≤ 5
4-2 Wet heat resistance: 28 days at 70 °C in water – IEC 60455-2 Not relevant
a
According IEC 60212 atmosphere B.
b -1 -1 -1 -1 -1 -1
Use spindle 2 min and 10 min for viscosities up to 4 Pa·s; use spindle 3 min and 10 min for viscosities > 4 Pa·s up to 10 Pa·s; use spindle 4 min and 10 min for
-1 -1 -1 -1
viscosities > 10 Pa·s up to 20 Pa·s; use spindle 5 min and 10 min for viscosities > 20 Pa·s up to 40 Pa·s; use spindle 7 min and 50 min for viscosities > 40 Pa·s.
Reading when indication is stable.
– 16 – IEC 60455-3-8:2021 © IEC 2021
7 Information on supply, packaging, marking and labelling
7.1 Packaging
Packaging shall be sufficient to ensure that any stated shelf life of the reactive components is
maintained when stored under specified conditions of temperature and humidity.
7.2 Marking and labelling
7.2.1 General
The following information, in the relevant national language(s), shall be printed or labelled on
the resin components packaging and on the accessory kit.
7.2.2 Components
Each individual part of the resin or the reactive compound if packed separately shall be printed
or labelled on its packaging with:
1) the supplier’s name or logo;
2) the part number or identification;
3) the lot number or production date;
4) the specified storage conditions, if any;
5) the “use before date” (shelf life);
6) the health and safety marking according to relevant EU or national legislation;
7) the mixing and application instructions
8) the resin categories.
7.2.3 Accessory kit
Each accessory kit containing a reactive component shall be printed or labelled on its packaging
and shall at least indicate:
1) the specified storage conditions, if any;
2) the “use before date” (shelf life);
3) the health and safety marking according to relevant EU or national legislation.
Annex A
(normative)
Examination grid
Evaluate the concentration and dimension of bubbles created by using an examination grid.
The grid measures 45 × 24 mm (width × height) and is made up of 15 cells of dimensions
9 mm × 8 mm (see Figure A.1):
Dimensions in millimetres
Figure A.1 – Examination grid
Position the grid centrally on the cut surface. To pass the examination no bubbles > 3 mm are
allowed and at least 5 cells shall be free of bubbles. Count only bubbles with a diameter ≥ 1 mm
(see Figure A.2).
Dimensions in millimetres
Figure A.2 – Position of examination grid on the specimen
– 18 – IEC 60455-3-8:2021 © IEC 2021
Bibliography
IEC 60455-1, 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 60502-4, Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV) – Part 4: Test requirements on accessories
m m
for cables with rated voltages from 6 kV (U = 7,2 kV) up to 30 kV (U = 36 kV)
m m
IEC 61234-2, Electrical insulating materials – Methods of test for the hydrolytic stability – Part 2:
Moulded thermosets
ISO 291, Plastics – Standard atmospheres for conditioning and testing
ISO 2592, Petroleum and related products – Determination of flash and fire points – Cleveland
open cup method
ISO 3521, Plastics – Unsaturated polyester and epoxy resins – Determination of overall volume
shrinkage
ISO 7056, Plastics laboratory ware – Beakers
EN 50393, Test methods and requirements for accessories for use on distribution cables of
rated voltage 0,6/1,0 (1,2) kV
HD 629.1, Test requirements on accessories for use on power cables of rated voltage from
3,6/6(7,2) kV up to 20,8/36(42) kV – Part 1: Cables with extruded insulation
HD 629.2, Test requirements on accessories for use on power cables of rated voltage from
3,6/6(7,2) kV up to 20,8/36(42) kV – Part 2: Cables with impregnated paper insulation
___________
– 20 – IEC 60455-3-8:2021 © IEC 2021
SOMMAIRE
AVANT-PROPOS . 21
INTRODUCTION . 23
1 Domaine d’application . 24
2 Références normatives . 24
3 Termes et définitions . 25
4 Désignation . 25
5 Essais de type . 26
5.1 Généralités . 26
5.2 Échantillonnage . 26
5.3 Préparation et conditionnement . 26
5.3.1 Généralités . 26
5.3.2 Composants individuels avant mélange . 26
5.3.3 Résine juste après mélange (étape de durcissement) . 26
5.3.4 Résine durcie (originale) . 27
5.3.5 Résine durcie après vieillissement thermique (sec et humide) . 27
5.4 Séquence d’essais . 27
5.5 Rapport d'essai . 27
6 Méthodes d’essai. 27
7 Informations sur la livraison, l'emballage, le marquage et l'étiquetage . 35
7.1 Emballage . 35
7.2 Marquage et étiquetage . 35
7.2.1 Généralités . 35
7.2.2 Composants . 35
7.2.3 Kit d'accessoires . 35
Annexe A (normative) Grille d’évaluation . 36
Bibliographie . 37
Figure A.1 – Grille d’évaluation . 36
Figure A.2 – Position de la grille d’évaluation sur l’éprouvette. 36
Tableau 1 – Catégories de résines . 25
Tableau 2 – Essais de type: méthodes d'essai et exigences pour les résines de
polyuréthanne . 29
Tableau 3 – Essais de type: méthodes d'essai et exigences pour les résines
polybutadiènes . 31
Tableau 4 – Essais de type: méthodes d'essai et exigences pour les résines époxydes . 32
Tableau 5 – Essais de type: méthodes d'essai et exigences pour les résines de
silicone . 34
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
COMPOSÉS RÉACTIFS À BASE DE RÉSINES UTILISÉS
COMME ISOLANTS ÉLECTRIQUES –
Partie 3-8: Spécifications pour matériaux particuliers –
Résines pour accessoires de câble
AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l'électricité et de l'électronique. À cet effet, l’IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des
Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des comités d'études, aux
travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent également aux
travaux. L’IEC collabore étroitement avec l'Organisation Interna
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...