SIST EN 62329-2:2007

SLOVENSKI STANDARD
01-november-2007
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Heat shrinkable moulded shapes -- Part 2: Methods of test (IEC 62329-2:2006)
Wärmeschrumpfende Formteile -- Teil 2: Prüfverfahren (IEC 62329-2:2006)
Gaines thermorétractables -- Partie 2: Méthodes d'essai (IEC 62329-2:2006)
Ta slovenski standard je istoveten z: EN 62329-2:2006
ICS:
29.035.20 3ODVWLþQLLQJXPHQLL]RODFLMVNL Plastics and rubber insulating
PDWHULDOL materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62329-2
NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM
ICS 29.035.20
English version
Heat shrinkable moulded shapes
Part 2: Methods of test
(IEC 62329-2:2006)
Gaines thermorétractables  Wärmeschrumpfende Formteile
Partie 2: Méthodes d'essai Teil 2: Prüfverfahren
(CEI 62329-2:2006) (IEC 62329-2:2006)

This European Standard was approved by CENELEC on 2006-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62329-2:2006 E
Foreword
The text of document 15/316/FDIS, future edition 1 of IEC 62329-2, prepared by IEC TC 15, Standards
on specifications for electrical insulating materials, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 62329-2 on 2006-10-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62329-2:2006 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62329-2:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60093 1980 Methods of test for volume resistivity and HD 429 S1 1983
surface resistivity of solid electrical insulating
materials
IEC 60212 1971 Standard conditions for use prior to and HD 437 S1 1984
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 1998 Electrical strength of insulating materials - EN 60243-1 1998
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 1984 Test methods for evaluating resistance to HD 380 S2 1987
tracking and erosion of electrical insulating
materials used under severe ambient
conditions
IEC/TS 60695-6-30 1996 Fire hazard testing - -
Part 6: Guidance and test methods on the
assessment of obscuration hazards of vision
caused by smoke opacity from
electrotechnical products involved in fires -
Section 30: Small-scale static method -
Determination of smoke opacity - Description
of the apparatus
IEC 60695-11-10 1999 Fire hazard testing EN 60695-11-10 1999
Part 11-10: Test flames - 50 W horizontal and
vertical flame test methods
Publication Year Title EN/HD Year
IEC 60754-1 1994 Test on gases evolved during combustion of - -
materials from cables
Part 1: Determination of the amount of
halogen acid gas
1)
IEC 60754-2 (mod) 1991 Test on gases evolved during combustion of HD 602 S1 1992
electric cables
Part 2: Determination of degree of acidity of
gases evolved during the combustion of
materials taken from electric cables by
measuring pH and conductivity
IEC 62329-1 2005 Heat shrinkable moulded shapes EN 62329-1 2006
Part 1: Definitions and general requirements

ISO 62 1999 Plastics - Determination of water absorption - -

ISO 105-A02 1993 Textiles - Tests for colour fastness EN 20105-A02 1994
Part A02: Grey scale for assessing change in
colour
ISO 105-B01 1994 Textiles - Tests for colour fastness EN ISO 105-B01 1999
Part B01: Colour fastness to light: Daylight

ISO 846 1997 Plastics - Evaluation of the action of EN ISO 846 1997
microorganisms
ISO 3261 1975 Fire tests - Vocabulary - -

ISO 4589-2 1996 Plastics - Determination of burning behaviour EN ISO 4589-2 1999
by oxygen index
Part 2: Ambient-temperature test

ISO 4589-3 1996 Plastics - Determination of burning behaviour EN ISO 4589-3 1996
by oxygen index
Part 3: Elevated-temperature test

1)
HD 602 S1 is superseded by EN 50267-1:1998 and EN 50267-2-3:1998.

INTERNATIONAL IEC
STANDARD 62329-2
First edition
2006-07
Heat-shrinkable moulded shapes –
Part 2:
Methods of test
 IEC 2006  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale X
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 62329-2 © IEC:2006(E)
CONTENTS
FOREWORD.6
INTRODUCTION.8
1 Scope.9
2 Normative references .9
3 Test conditions .10
4 Standard test specimens .11
4.1 Moulded shape material specimens.11
4.2 Moulded shape compatibility specimens .11
5 Dimensions .11
5.1 Number of test specimens .11
5.2 Procedure .11
5.3 Result .11
6 Density.11
6.1 Number of test specimens .11
6.2 Procedure .11
6.3 Report .11
6.4 Result .11
7 Heat shock .12
7.1 Number of test specimens .12
7.2 Form of test specimens .12
7.3 Procedure .12
7.4 Report .12
7.5 Result .12
8 Bending at low temperature .12
8.1 Number and form of test specimens .12
8.2 Procedure .12
8.3 Result .12
9 Dimensional stability on storage .12
9.1 Number of test specimens .12
9.2 Procedure .13
9.3 Result .13
10 Tensile strength and elongation at break .13
10.1 Number and form of test specimens .13
10.2 Conditioning .13
10.3 Test temperature.13
10.4 Procedure .13
10.5 Calculations .14
10.6 14
10.7 Result .14
11 Secant modulus at 2 % elongation.14
11.1 Number and form of test specimens .14
11.2 Procedure .14
11.3 Calculation .15
11.4 Report .15
11.5 Result .15

62329-2 © IEC:2006(E) – 3 –
12 Electric strength .15
12.1 Number and form of test specimens .15
12.2 Conditioning .15
12.3 Electrodes .15
12.4 Procedure .15
12.5 Result .15
12.6 Result .16
13 Volume resistivity after damp heat.16
13.1 Number and form of test specimens .16
13.2 Electrodes .16
13.3 Procedure .16
13.4 Result .16
14 Permittivity and dissipation factor .16
14.1 Number and form of test specimens. .16
14.2 Electrodes .16
14.3 Procedure .16
14.4 Calculation .16
14.5 Result .16
15 Resistance to tracking .17
15.1 Report .17
15.2 Result .17
16 Flammability.17
16.1 Number and form of test specimens .17
16.2 Procedure .17
16.3 Result .17
17 Oxygen index .17
17.1 Oxygen index at ambient temperature .17
17.2 Oxygen index at elevated temperature .17
18 Copper corrosion (presence of corrosive volatiles) .17
18.1 Principle.17
18.2 Apparatus.18
18.3 Number and form of test specimens .18
18.4 Procedure .18
18.5 Report .18
18.6 Result .18
19 Colour fastness to light.19
19.1 Principle.19
19.2 Test specimen.19
19.3 Procedure .19
19.4 Result .19
20 Resistance to selected fluids .19
20.1 Principle.19
20.2 Choice of fluid .19
20.3 Methods of assessment.19
20.4 Number and form of test specimens .20
20.5 Procedure .20
20.6 Result .20

– 4 – 62329-2 © IEC:2006(E)
21 Long term heat ageing (3000 h).20
21.1 Number and form of test specimens .20
21.2 Procedure .20
21.3 Report .21
21.4 Result .21
22 Mass .21
22.1 Number of test specimens .21
22.2 Procedure .21
22.3 Result .21
23 Heat ageing.21
23.1 Number and form of test specimens .21
23.2 Procedure .21
24 Water absorption .21
25 Colour stability to heat.21
25.1 Number of test specimens .21
25.2 Form of test specimens .21
25.3 Procedure .22
25.4 Report .22
25.5 Result .22
26 Smoke index.22
26.1 Definitions .22
26.2 Principle.22
26.3 Apparatus.22
26.4 Number and form of test specimen .23
26.5 Conditioning .23
26.6 Mounting of test pieces .23
26.7 Safety of operations .23
26.8 Procedure .23
26.9 Calculation of results.24
27 Toxicity index .26
27.1 Definition.26
27.2 Principle.27
27.3 Apparatus.27
27.4 Conditioning .28
27.5 Safety of operations .28
27.6 Test procedure .28
27.7 Calculation of toxicity index .30
27.8 Toxic constituents .30
27.9 Values for C .31
f
27.10 Result and report.31
28 Halogen content .31
28.1 Method for the determination of low levels of chlorine and/or bromine and/or
iodine .31
28.2 Determination of low levels of fluorine .32
29 Acid gas generation.33
30 Resistance to mould growth.33

62329-2 © IEC:2006(E) – 5 –
31 Compatibility .34
31.1 Dynamic shear at room temperature.34
31.2 Static load .34
31.3 Fluid resistance.35
31.4 Thermal ageing .36
31.5 Peel adhesion .36
31.6 Altitude immersion.37

Bibliography.47

Figure 1 – Dumb-bell specimen for tensile strength test.39
Figure 2 – Schematic details of burner for smoke index test.40
Figure 3 – Compatibility test specimen.41
Figure 4 – Aluminium test adaptor .42
Figure 5 – Tensile test fixture for adaptor.42
Figure 6 – Test arrangement for dynamic shear .43
Figure 7 – Test arrangement for static load.44
Figure 8 – Test assembly for peel adhesion .44
Figure 9 – Test arrangement for heatshrink sleeved cable to moulded shape.45
Figure 10 – Test arrangement for aluminium adaptor to moulded shape.46

– 6 – 62329-2 © IEC:2006(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HEAT-SHRINKABLE 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment
declared to be in conformity with an IEC Publication.
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 62329-2 has been prepared by IEC technical committee 15: Standards
on specifications for electrical insulating materials.
The text of this standard is based on the following documents:
FDIS Report on voting
15/316/FDIS 15/338/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62329-2 © IEC:2006(E) – 7 –
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 8 – 62329-2 © IEC:2006(E)
INTRODUCTION
This International Standard is one of a series which deals with heat-shrinkable moulded shapes.
The series consists of the following parts:
Part 1: Definitions and general requirements (IEC 62329-1)
Part 2: Methods of test (IEC 62329-2)
Part 3: Specification requirements for shape dimensions, material requirements and
compatibility performance (IEC 62329-3) (in consideration)

62329-2 © IEC:2006(E) – 9 –
HEAT-SHRINKABLE MOULDED SHAPES –

Part 2: Methods of test
1 Scope
This part of IEC 62329 gives methods of test for heat-shrinkable 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 do not completely establish the suitability of moulded shapes for impregnation or
encapsulation processes or other specialized applications. Where necessary, the test methods in
this Part will need to be supplemented by appropriate impregnation or compatibility tests to suit
the individual circumstances.
2 Normative references
The following referenced documents are indispensable for the application 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 60093:1980, Methods of test for volume resistivity and surface resistivity of solid electrical
insulating materials
IEC 60212:1971, 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 60243-1:1998, 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 60587:1984, Test methods for evaluating resistance to tracking and erosion of electrical
insulating materials used under severe ambient conditions
IEC 60695-6-30:1996, Fire hazard testing – Part 6: Guidance and test methods on the
assessment of obscuration hazards of vision caused by smoke opacity from electrotechnical
products involved in fires – Section 30: Small scale static method. Determination of smoke
opacity. Description of the apparatus
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
– 10 – 62329-2 © IEC:2006(E)
IEC 60754-1:1994, Test on gases evolved during combustion of materials from cables – Part 1:
Determination of the amount of halogen acid gas
IEC 60754-2:1991, Test on gases evolved during combustion of materials from cables – Part 2:
Determination of degree of acidity of gases evolved during the combustion of materials taken
from electric cables by measuring pH and conductivity
IEC 62329-1:2005, Heat shrinkable moulded shapes – Part 1: Definitions and general
requirements
ISO 62:1999, Plastics – Determination of water absorption
ISO 105-A02:1993, Textiles – Tests for colour fastness – Part A02: Grey scale for assessing
changes in colour
ISO 105-B01:1994, Textiles – Tests for colour fastness – Part B01: Colour fastness to light:
Daylight
ISO 846:1997, Plastics – Evaluation of the action of micro-organisms
ISO 32611975, Fire tests – Vocabulary
ISO 4589-2:1996, Plastics – Determination of burning behaviour by oxygen index – Part 2:
Ambient-temperature test
ISO 4589-3:1996, Plastics – Determination of burning behaviour by oxygen index – Part 3:
Elevated-temperature test
3 Test conditions
Unless otherwise specified, all tests shall be made under standard ambient conditions according
to IEC 60212; i.e. 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.
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.
Where a test at low temperature is specified, the specification sheets of IEC 62329-3 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.
___________
This standard has been withdrawn.

62329-2 © IEC:2006(E) – 11 –
4 Standard test specimens
4.1 Moulded shape material 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 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 x 150 mm.
4.2 Moulded shape compatibility specimens
See IEC 62329-1, Subclause 4.2, and Clause 31 of this standard.
5 Dimensions
5.1 Number of test specimens
Three specimens of each size and style shall be tested.
5.2 Procedure
Measure the moulded shapes in the as supplied condition and after unrestricted shrinkage as
specified in IEC 62329-3. Carry out unrestricted shrinkage by conditioning in an oven for the time
and temperature specified in IEC 62329-3. Remove the shapes from the oven and allow to cool
naturally to the ambient temperature specified in Clause 3. 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 ±0,25 mm. In the case of dispute an optical method shall be used.
5.3 Result
Report all measured values as the result.
6 Density
6.1 Number of test specimens
At least three specimens shall be tested, cut from a test sheet in accordance with 4.1.
6.2 Procedure
Any method for the determination of the density may be used which can ensure an accuracy of
±0,01 g/cm .
6.3 Report
Record the method selected for the determination and report all measured values for density
6.4 Result
The result is the mean, unless specified otherwise in the specification sheets of IEC 62329-3.

– 12 – 62329-2 © IEC:2006(E)
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 4.1.
7.3 Procedure
The specimens shall be suspended vertically in an oven for 4 h ± 10 min at the temperature
specified in IEC 62329-3.
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 62329-3 the specimens shall be tested for tensile strength and elongation at break.
7.4 Report
Report all results from the visual examination. Report all calculated values.
7.5 Result
The results for each property is the central value unless otherwise specified in the specification
sheets of IEC 62329-3.
8 Bending at low temperature
8.1 Number and form of test specimens
Cut three specimens from a test sheet in accordance with 4.1 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 62329-3. 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 62329-3. 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.
62329-2 © IEC:2006(E) – 13 –
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 Clause 3 for (336 ± 2) h at a
temperature of 40 °C ± 3 K unless otherwise specified in the relevant sheet of IEC 62329-3. 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 5.
Following this measurement, the shapes shall be allowed to fully recover, using the time and
temperature specified in IEC 62329-3 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: expanded
dimensions before and after storage at elevated temperature, and 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 4.1 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.
10.2 Conditioning
Unless otherwise specified in IEC 62329-3, 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 62329-3 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.

– 14 – 62329-2 © IEC:2006(E)
10.5 Calculations
The tensile strength shall be calculated from the maximum load and the original area of cross-
section and the result expressed in megapascals (MPa):
F
max
tensile strength = (MPa)
A
where
F is the maximum load (N);
max
A is the original cross-sectional area (mm ).
The elongation at break shall be expressed as a percentage of the original distance between the
reference lines, i.e.:
()L − L
o
elongation at break (%) = × 100
L
o
where
L is the measured distance between the two marks on the stretched specimen at break;
L is the original distance between the marks.
o
10.6
Report all calculated values.
10.7 Result
The results for each property is the central value unless otherwise specified in the specification
sheets of IEC 62329-3.
...