EN IEC 62677-2:2018

Heat shrinkable low and medium voltage moulded shapes - Part 2 Methods of test

IEC 62677-2:2017 gives methods of test for heat shrinkable low and medium voltage moulded shapes in a range of configurations and materials suitable for insulation, environmental sealing, mechanical protection and strain relief for connector/cable terminations and multi-way transitions. The tests specified are designed to control the quality of the moulded shapes but it is recognized that they are designed to be used in low and medium voltage cable accessories and as such electrical performance will be proven as part of the assembly. Examples of this are described in EN 50393, HD 629.1 and IEC 60502-4.

Wärmeschrumpfende Nieder- und Mittelspannungsformteile – Teil 2: Prüfverfahren

Profilés thermorétractables basse et moyenne tensions - Partie 2: Méthodes d’essai

IEC 62677-2:2017 décrit des méthodes d'essai des profilés thermorétractables basse et moyenne tensions dans une gamme de configurations et de matériaux adaptés à l’isolement, aux éléments d’étanchéité contre les intempéries, à la protection mécanique et aux dispositifs compensateurs de traction pour les connecteurs/extrémités de câbles et aux transitions à conducteurs multiples. Les essais spécifiés sont conçus pour contrôler la qualité des profilés, mais il est reconnu qu'ils sont conçus pour être utilisés dans des accessoires de câbles basse et moyenne tensions et, à ce titre, la performance électrique sera prouvée dans le cadre de l'assemblage. Des exemples sont développés dans l'EN 50393, le HD 629.1 et l'IEC 60502-4. Mots clés: profilés thermorétractables basse et moyenne tensions

Toplotno skrčljive nizko- in srednjenapetostne ulite forme - 2. del: Metode preskušanja (IEC 62677-2:2017)

Ta del IEC 62677 opisuje metode preskusov za toplotno skrčljive nizko- in srednjenapetostne oblikovance v različnih konfiguracijah in iz različnih materialov, primernih za izolacijo, zaščito pred okoljskimi vplivi, mehansko zaščito in razbremenitev za ozemljitve priključkov/kablov in večsmernih prenosov.
Opisani preskusi so namenjeni nadzoru nad kakovostjo oblikovancev, pri čemer se upošteva, da so zasnovani za uporabo z nizko- in srednjenapetostnimi kabli, zato se kot del sestava preverja tudi električna zmogljivost. Primeri tega so opisani v standardih EN 50393, HD 629.1 in IEC 60502-4.

General Information

• Status: Published
• Publication Date: 01-Feb-2018
• Withdrawal Date: 14-Nov-2020
• ICS: 29.035.01 - Insulating materials in general
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: CLC/SR 15 - Insulating materials
• Drafting Committee: IEC/TC 15 - IEC_TC_15
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 02-Feb-2018
• Completion Date: 02-Feb-2018
• Ref Project: SIST EN IEC 62677-2:2018 - Heat shrinkable low and medium voltage moulded shapes - Part 2 Methods of test (IEC 62677-2:2017)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2018
7RSORWQRVNUþOMLYHQL]NRLQVUHGQMHQDSHWRVWQHXOLWHIRUPHGHO0HWRGH
SUHVNXãDQMD,(&
Heat shrinkable low and medium voltage moulded shapes - Part 2 Methods of test (IEC
62677-2:2017)
Ta slovenski standard je istoveten z: EN IEC 62677-2:2018
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62677-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2018
ICS 29.035.01; 29.035.20
English Version
Heat shrinkable low and medium voltage moulded shapes - Part
2 Methods of test
(IEC 62677-2:2017)
Profilés thermorétractables basse et moyenne tensions - Wärmeschrumpfende Nieder- und Mittelspannungsformteile
Partie 2: Méthodes d'essai - Teil 2: Prüfverfahren
(IEC 62677-2:2017) (IEC 62677-2:2017)
This European Standard was approved by CENELEC on 2017-11-15. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62677-2:2018 E

European foreword
The text of document 15/807/FDIS, future edition 1 of IEC 62677-2, prepared by IEC/TC 15 "Solid
electrical insulating materials", was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62677-2:2018.
The following dates are fixed:
(dop) 2018-08-15
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2020-11-15
• latest date by which the national standards conflicting with
the document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62677-2:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated :
IEC 62677-1 NOTE  Harmonized as EN IEC 62677-1.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60212 2010 Standard conditions for use prior to and EN 60212 2011
during the testing of solid electrical
insulating materials
IEC 60216-4-1 2006 Electrical insulating materials - Thermal EN 60216-4-1 2006
endurance properties -- Part 4-1: Ageing
ovens - Single-chamber ovens
IEC 60216-4-2 2000 Electrical insulating materials - Thermal EN 60216-4-2 2000
endurance properties -- Part 4-2: Ageing
ovens - Precision ovens for use up to 300
°C
IEC 60243-1 2013 Electric strength of insulating materials - EN 60243-1 2013
Test methods -- Part 1: Tests at power
frequencies
IEC 60250 1969 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 60587 2007 Electrical insulating materials used under EN 60587 2007
severe ambient conditions - Test methods
for evaluating resistance to tracking and
erosion
IEC 60695-11-2 2013 Fire hazard testing -- Part 11-2: Test EN 60695-11-2 2014
flames - 1 kW nominal premixed flame:
Apparatus, confirmatory test arrangement
and guidance
IEC 60695-11-10 2013 Fire hazard testing -- Part 11-10: Test EN 60695-11-10 2013
flames - 50 W horizontal and vertical flame
test methods
IEC 62631-3-1 2016 Dielectric and resistive properties of solid EN 62631-3-1 2016
insulating materials - Part 3-1
Determination of resistive properties (DC
methods) - Volume resistance and volume
resistivity, general method
IEC 62677-3 series Heat-shrinkable low and medium voltage - series
moulded shapes - Part 3: Specification for
individual materials
ISO 62 2008 Plastics - Determination of water EN ISO 62 2008
absorption
ISO 846 1997 Plastics - Evaluation of the action of EN ISO 846 1997
microorganisms
ISO 4892-3 2016 Plastics - Methods of exposure to EN ISO 4892-3 2016
laboratory light sources - Part 3:
Fluorescent UV lamps
ISO 11357-3 2011 Plastics - Differential scanning calorimetry EN ISO 11357-3 2013
(DSC) - Part 3: Determination of
temperature and enthalpy of melting and
crystallization
ISO 11358-1 2014 Plastics - Thermogravimetry (TG) of EN ISO 11358-1 2014
polymers - Part 1: General principles

IEC 62677-2 ®
Edition 1.0 2017-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Heat shrinkable low and medium voltage moulded shapes –

Part 2: Methods of test
Profilés thermorétractables basse et moyenne tensions –

Partie 2: Méthodes d’essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.20; 29.035.01 ISBN 978-2-8322-4869-0

– 2 – IEC 62677-2:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Test conditions . 9
5 Standard test specimens . 9
6 Dimensions. 9
6.1 Number of test specimens . 9
6.2 Procedure . 9
6.3 Result . 10
7 Heat shock . 10
7.1 Number of test specimens . 10
7.2 Form of test specimens . 10
7.3 Procedure . 10
7.4 Report. 10
7.5 Result . 10
8 Bending at low temperature . 10
8.1 Number and form of test specimens . 10
8.2 Procedure . 10
8.3 Result . 10
9 Dimensional stability on storage . 10
9.1 Number of test specimens . 10
9.2 Procedure . 11
9.3 Result . 11
10 Tensile strength and elongation at break . 11
10.1 Number and form of test specimens . 11
10.2 Conditioning . 12
10.3 Test temperature . 12
10.4 Procedure . 12
10.5 Calculations . 12
10.6 Report. 12
10.7 Result . 12
11 Secant modulus at 2 % elongation . 13
11.1 Number and form of test specimens . 13
11.2 Procedure . 13
11.3 Calculation . 13
11.4 Report. 13
11.5 Result . 13
12 Electric strength . 13
12.1 Number and form of test specimens . 13
12.2 Conditioning . 13
12.3 Electrodes . 13
12.4 Procedure . 14
12.5 Report. 14

IEC 62677-2:2017 © IEC 2017 – 3 –
12.6 Result . 14
13 Volume resistivity . 14
13.1 Number and form of test specimens . 14
13.2 Electrodes . 14
13.3 Procedure . 14
13.4 Report. 14
13.5 Result . 14
14 Permittivity and dissipation factor . 14
14.1 Number and form of test specimens . 14
14.2 Electrodes . 14
14.3 Procedure . 14
14.4 Calculation . 14
14.5 Result . 15
15 Resistance to tracking . 15
15.1 Procedure . 15
15.2 Report. 15
15.3 Result . 15
16 Flammability . 15
16.1 Method A . 15
16.1.1 Number and form of test specimens . 15
16.1.2 Procedure . 15
16.1.3 Result . 15
16.2 Method B . 15
16.2.1 Number and form of test specimens . 15
16.2.2 Apparatus . 15
16.2.3 Procedure . 15
16.2.4 Result . 16
17 Carbon black content . 16
17.1 Number and form of test specimens . 16
17.2 Procedure . 16
17.3 Report. 16
17.4 Result . 17
18 Resistance to selected fluids . 17
18.1 Principle . 17
18.2 Choice of fluid . 17
18.3 Methods of assessment . 17
18.4 Number and form of test specimens . 17
18.5 Procedure . 17
18.6 Result . 18
19 Long term heat ageing (3 000 h) . 18
19.1 Number and form of test specimens . 18
19.2 Procedure . 18
19.3 Report. 18
19.4 Result . 18
20 Heat ageing . 18
20.1 Number and form of test specimens . 18
20.2 Procedure . 18
21 Water absorption . 18

– 4 – IEC 62677-2:2017 © IEC 2017
21.1 Procedure . 18
21.2 Report. 18
21.3 Result . 18
22 Resistance to mould growth . 19
22.1 Test in accordance with ISO 846 . 19
22.2 Report. 19
22.3 Result . 19
23 Peel adhesion . 19
23.1 Principle . 19
23.2 Apparatus . 19
23.3 Form and number of test specimens . 19
23.4 Procedure . 19
23.5 Calculation . 20
23.6 Report. 20
23.7 Result . 20
24 Copper corrosion (presence of corrosive volatiles) . 20
24.1 Principle . 20
24.2 Apparatus . 20
24.3 Number and form of test specimens . 21
24.4 Procedure . 21
24.5 Report. 21
24.6 Result . 21
25 Halogen content . 21
25.1 Method for the determination of low levels of chlorine and/or bromine and/or
iodine . 21
25.1.1 Principle . 21
25.1.2 Apparatus . 22
25.1.3 Procedure . 22
25.2 Determination of low levels of fluorine . 22
25.2.1 Principle . 22
25.2.2 Apparatus . 22
25.2.3 Reagents . 23
25.2.4 Procedure . 23
25.3 Result . 23
26 Adhesive temperature resistance . 23
26.1 Number and form of test specimens . 23
26.2 Procedure . 23
26.3 Report. 23
26.4 Result . 24
27 Resistance to weathering . 24
27.1 Number and form of test specimens . 24
27.2 Procedure . 24
27.3 Report. 24
Bibliography . 25

Figure 1 – Dumb-bell specimen for tensile strength test . 11
Figure 2 – Test arrangement for flammability to Clause 16 method B . 16
Figure 3 – Test arrangement for heat shrink moulded shape on metal tube or cable . 20

IEC 62677-2:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HEAT SHRINKABLE LOW AND MEDIUM
VOLTAGE MOULDED SHAPES –
Part 2: Methods of test
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 62677-2 has been prepared by committee TC15: Solid electrical
insulating materials.
The text of this standard is based on the following documents:
FDIS Report on voting
15/807/FDIS 15/811/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62677 series, published under the general title Heat shrinkable
low and medium voltage moulded shapes, can be found on the IEC website.

– 6 – IEC 62677-2:2017 © IEC 2017
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
IEC 62677-2:2017 © IEC 2017 – 7 –
INTRODUCTION
This part of IEC 62677 is one of a series which deals with heat shrinkable low and medium
voltage moulded shapes. The series consists of three parts:
Part 1: General requirements (IEC 62677-1 )
Part 2: Methods of test (IEC 62677-2)
2 3 4
Part 3: Material requirements (IEC 62677-3-101 , IEC 62677-3-102 and IEC 62677-3-103 )

____________
Under preparation. Stage at the time of publication: IEC RFDIS IEC 62677-1:2017.
Under preparation. Stage at the time of publication: IEC AFDIS IEC 62677-3-101:2017.
Under preparation. Stage at the time of publication: IEC AFDIS IEC 62677-3-102:2017.
Under preparation. Stage at the time of publication: IEC ACDV IEC 62677-3-103:2017.

– 8 – IEC 62677-2:2017 © IEC 2017
HEAT SHRINKABLE LOW AND MEDIUM
VOLTAGE MOULDED SHAPES –
Part 2: Methods of test
1 Scope
This part of IEC 62677 gives methods of test for heat shrinkable low and medium voltage
moulded shapes in a range of configurations and materials suitable for insulation,
environmental sealing, mechanical protection and strain relief for connector/cable
terminations and multi-way transitions.
The tests specified are designed to control the quality of the moulded shapes but it is
recognized that they are designed to be used in low and medium voltage cable accessories
and as such electrical performance will be proven as part of the assembly. Examples of this
are described in EN 50393, HD 629.1 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 60212:2010, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216-4-1:2006, Electrical insulating materials – Thermal endurance properties – Part 4-
1: Ageing ovens – Single-chamber ovens
IEC 60216-4-2:2000, Electrical insulating materials – Thermal endurance properties – Part 4-
2: Ageing ovens – Precision ovens for use up to 300 °C
IEC 60243-1:2013, Electric strength of insulating materials – Test methods – Part 1: Tests at
power frequencies
IEC 60250:1969, 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 60587:2007, Electrical insulating materials used under severe ambient conditions – Test
methods for evaluating resistance to tracking and erosion
IEC 62631-3-1:2016, 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 60695-11-2:2013, Fire hazard testing – Part 11-2: Test flames – 1 kW pre-mixed flame –
Apparatus, confirmatory test arrangement and guidance
IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC 62677-3 (all parts), Heat shrinkable low and medium voltage moulded shapes
ISO 62:2008, Plastics – Determination of water absorption
ISO 846:1997, Plastics – Evaluation of the action of microorganisms

IEC 62677-2:2017 © IEC 2017 – 9 –
ISO 4892-3:2016, Plastics – Methods of exposure to laboratory light sources – Part 3:
Fluorescent UV lamps
ISO 11357-3:2011, Plastics – Differential scanning calorimetry (DSC) – Part 3: Determination
of temperature and enthalpy of melting and crystallization
ISO 11358-1:2014, Plastics – Thermogravimetry (TG) of polymers - Part1: General principles
ISO 11358-2:2014, Plastics – Thermogravimetry (TG) of polymers - Part 2: Determination of
activation energy
3 Terms and definitions
No terms and definitions are listed in this document.
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
4 Test conditions
4.1 Unless otherwise specified, all tests shall be made under standard ambient conditions
according to IEC 60212, that is at a temperature between 15 °C and 35 °C and at ambient
relative humidity.
In cases of dispute, the tests shall be carried out at a temperature of 23 °C ± 2 K and at
(50 ± 5) % relative humidity.
4.2 When heating at elevated temperature is specified for a test procedure, the specimen
shall be maintained for the prescribed period in a uniformly heated oven complying with either
IEC 60216-4-1 or IEC 60216-4-2.
4.3 Where a test at low temperature is specified, the specification sheets of
IEC 62677-3 (all parts) may require it to be carried out at t °C or lower, where t is the
requested temperature. In such cases, the operator may carry out the test at the specified
temperature or any lower temperature which is convenient. If, however, at a temperature
below that specified, the specimen fails to meet the requirements, the test shall be repeated
at the specified temperature, subject to a tolerance of ±3 K as specified in IEC 60212. If the
specimen then passes, it shall be considered to have met the requirements.
5 Standard test specimens
Moulded shape material specimens shall be prepared from (2 ± 0,15) mm thick sheets, unless
otherwise specified, and shall be prepared from the same heat shrinkable material and
conditions (including cross-linking) that is to be used to manufacture the heat shrinkable
moulded shapes. The dimensions of the sheet shall be sufficient to enable any of the relevant
tests to be performed.
NOTE A suitable size has been found to be 150 mm × 150 mm.
6 Dimensions
6.1 Number of test specimens
Three specimens of each size and style shall be tested.
6.2 Procedure
Measure the moulded shapes in the as supplied condition and after unrestricted shrinkage as
specified in IEC 62677-3 (all parts). Carry out unrestricted shrinkage by conditioning in an
oven for the time and temperature specified in IEC 62677-3 (all parts). Remove the shapes
from the oven and allow to cool naturally to the ambient temperature specified in Clause 4.

– 10 – IEC 62677-2:2017 © IEC 2017
The method of measurement can be mechanical or optical. Wall thickness shall be measured
to an accuracy of ±0,05 mm and internal diameter to an accuracy of ±0,1 mm. In the case of
dispute an optical method shall be used.
6.3 Result
Report all measured values as the result.
7 Heat shock
7.1 Number of test specimens
Three specimens shall be tested.
7.2 Form of test specimens
Cut three specimens in accordance with Clause 10, from a test sheet in accordance with
Clause 5.
7.3 Procedure
The specimens shall be suspended vertically in an oven for 4 h ± 10 min at the temperature
specified in IEC 62677-3 (all parts).
The specimens shall be removed and allowed to cool to room temperature. They shall then be
visually examined for any signs of dripping, cracking or flowing. In addition, when so specified
in IEC 62677-3 (all parts) the specimens shall be tested for tensile strength and elongation at
break.
7.4 Report
Report all results from the visual examination. Report all values from the tensile strength and
elongation test.
7.5 Result
The result for each property is the central value unless otherwise specified in the specification
sheets of IEC 62677-3 (all parts).
8 Bending at low temperature
8.1 Number and form of test specimens
Cut three specimens from a test sheet in accordance with Clause 5 approximately
150 mm × 6 mm.
8.2 Procedure
The specimens shall be suspended for 4 h ± 10 min in a chamber maintained at the
temperature specified in IEC 62677-3 (all parts). While still at that temperature, they shall be
wound without jerking for one complete turn in a close helix round a mandrel also at the same
temperature and having a diameter specified in IEC 62677-3 (all parts). The time to achieve
one complete turn shall not be greater than 5 s. The specimens shall then be allowed to
return to room temperature.
The specimens shall then be visually examined without magnification while still on the
mandrel for signs of cracking.
8.3 Result
Report whether there is any cracking.
9 Dimensional stability on storage
9.1 Number of test specimens
Three shapes shall be tested.
IEC 62677-2:2017 © IEC 2017 – 11 –
9.2 Procedure
The internal diameter of each outlet shall be measured in the expanded state as delivered.
The shapes shall then be stored in a ventilated oven as detailed in 4.2 for (336 ± 2) h at a
temperature of 40 °C ± 3 K unless otherwise specified in the relevant sheet of
IEC 62677-3 (all parts). They shall then be removed from the oven, allowed to cool to ambient
temperature and the same dimensions re-measured. The accuracy of measurement shall be
in accordance with Clause 6.
Following this measurement, the shapes shall be allowed to fully recover, using the time and
temperature specified in IEC 62677-3 (all parts) for the shapes being evaluated. The shapes
shall then be cooled to ambient temperature and the recovered dimensions measured.
9.3 Result
Report, as the result, all measured values for each of the three sets of measurements: the
expanded dimensions before and after storage at elevated temperature, and the fully
recovered dimensions after storage at elevated temperature.
10 Tensile strength and elongation at break
10.1 Number and form of test specimens
Cut five dumb-bell specimens from a test sheet in accordance with Clause 5 to the
dimensions and tolerances given in Figure 1. The specimens shall be stamped from the sheet
using a single stroke of a press and a knife edge punch of appropriate form and dimensions.
NOTE The profile given in Figure 1 is that of type 2 of ISO 37.
Dimensions in millimetres
A
C
G
F
E
Position of
reference lines
IEC
A = overall length, minimum 75 mm
B = width at ends (12,5 ± 1,0) mm
C = length of narrow parallel portions (25 ± 1) mm
D = width of narrow parallel portion (4,0 ± 0,1) mm
E = small radius (8,0 ± 0,5) mm
F = large radius (12,5 ± 1,0) mm
G = distance between reference lines 20 mm maximum
In any one specimen, the thickness of the narrow portion shall nowhere deviate by more than 2% from the mean.
Figure 1 – Dumb-bell specimen for tensile strength test
B
D
– 12 – IEC 62677-2:2017 © IEC 2017
10.2 Conditioning
Unless otherwise specified in IEC 62677-3 (all parts), the test specimens shall be kept at an
ambient temperature of 23 °C ± 2 K for at least 1 h before testing, or for a longer time to
enable the specimens to reach a temperature of 23 °C ± 2 K.
10.3 Test temperature
The test shall be made at a temperature of 23 °C± 2 K.
10.4 Procedure
The width and thickness of the central parallel portion of the specimen shall be measured
between the gauge marks to the nearest 0,01 mm at a minimum of three points. The average
cross-sectional area is then determined.
The specimen shall be mounted in the tensile test machine in axial alignment with the
direction of pull. The jaws shall be separated at the uniform rate specified in
IEC 62677-3 (all parts) for a particular material. The range of the testing machine shall be
such that the maximum load is between 15 % and 85 % of the maximum scale reading.
The distance between the reference lines at break may conveniently be measured by means
of a rule, callipers or an extensometer.
The maximum load shall be measured to an accuracy of 2 %. The distance between the
reference lines at break shall be measured to within 2 mm.
If the test specimen breaks outside the reference lines the result shall be discarded and a
further test made using another specimen.
10.5 Calculations
The tensile strength S shall be calculated from the maximum load and the original area of
cross-section, and the result expressed in megapascals (MPa):
F
max.
S = (MPa)
A
where
F is the maximum load (N);
max.
A is the original cross-sectional area (mm ).
The elongation at break E shall be expressed as a percentage of the original distance
between the reference lines, i.e.:
L − L
E = × 100 (%)
L
where
L is the measured distance between the two reference lines on the stretched specimen
at break;
L is the original distance between the two reference lines.

10.6 Report
Report all calculated values.
10.7 Result
The result for each property is the central value unless otherwise specified in the specification
sheets of IEC 62677-3 (all parts).

IEC 62677-2:2017 © IEC 2017 – 13 –
11 Secant modulus at 2 % elongation
11.1 Number and form of test specimens
Perform three tests on strips cut from a test sheet in accordance with Clause 5. The width of
the strips shall be approximately 20 mm.
11.2 Procedure
The procedure is as follows.
a) The secant modulus shall be calculated from the determination of the tensile stress
necessary to produce in the specimen an extension of 2 % of the length between jaws or
between reference lines.
b) Depending on the method of measurement chosen, the length of the specimen between
the jaws or reference lines shall be not less than 100 mm.
c) The extension may be measured by means of an extensometer or by jaw separation; the
extension shall be measured to an accuracy of 2 %.
d) The strain rate shall be (0,1 ± 0,03) mm/min for each millimetre length between jaws (e.g.
12 mm/min for a 120 mm length between jaws).
e) An initial tensile force (F) may need to be appl
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