IEC 61212-2:2006

Insulating materials - Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - Part 2: Methods of test

IEC 61212-2:2006 describes methods of test for the materials defined in IEC 61212-1. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone. The main changes from the previous edition are as follows: added application use and safety statements. Reformatted document to bring it up to current IEC document format. Test method references updated.

Matériaux isolants - Tubes et barres industriels rigides, ronds, stratifiés, à base de résines thermodurcissables, à usages électriques - Partie 2: Méthodes d'essai

La CEI 61212-2:2006 décrit les méthodes d'essai des matériaux définis dans la CEI 61212-1. Les matériaux qui sont conformes à cette spécification satisfont à des niveaux de performances établis. Cependant, il convient que le choix d'un matériau par un utilisateur et pour une application particulière soit fondé sur les exigences réelles nécessaires pour obtenir les performances satisfaisantes pour cette application, et non pas fondé sur cette seule spécification. Les principales modifications suivantes ont été apportées par rapport à l'édition précédente: ajout d'instructions liées à l'utilisation et à la sécurité de l'application. Le document a été reformaté pour tenir compte du format en cours des documents CEI. Les références à la méthode d'essai ont été mises à jour.

General Information

• Status: Published
• Publication Date: 09-Apr-2006
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 15 - Solid electrical insulating materials
• Drafting Committee: WG 6 - TC 15/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 10-Apr-2006
• Completion Date: 15-Jun-2006

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 61212-2
Second edition
2006-04
Insulating materials –
Industrial rigid round laminated tubes
and rods based on thermosetting resins
for electrical purposes –
Part 2:
Methods of test
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
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INTERNATIONAL IEC
STANDARD 61212-2
Second edition
2006-04
Insulating materials –
Industrial rigid round laminated tubes
and rods based on thermosetting resins
for electrical purposes –
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: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale S
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 61212-2  IEC:2006(E)
CONTENTS
FOREWORD.3

INTRODUCTION.5

1 Scope.6

2 Normative references .6

3 Conditioning of specimens.7

4 Dimensions .7

4.1 General .7
4.2 External diameter .7
4.3 Internal diameter .8
4.4 Wall thickness .9
4.5 Departure from straightness – Applicable to all tubes up to 300 mm diameter .10
5 Mechanical tests.10
5.1 Flexural strength perpendicular to laminations.10
5.2 Axial compressive strength.12
5.3 Cohesion between layers .14
6 Electrical tests.15
6.1 Electric strength and breakdown voltage .15
6.2 Insulation resistance after immersion in water .17
6.3 Dissipation factor and permittivity (tube only) .18
7 Other tests .18
7.1 Thermal endurance .18
7.2 Water absorption.19
7.3 Density.19
7.4 Flammability.19
BIBLIOGRAPHY .22

Figure 1 – Preparation of test specimen from a large tube for testing flexural strength.11
Figure 2 – Position of tube in testing machine for testing cohesion between layers .14
Figure 3 – Test specimens and electrodes for testing electric strength of tubes .17
Figure 4 – Test specimens for flammability testing.20

61212-2  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS

FOR ELECTRICAL PURPOSES –
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 61212-2 has been prepared by IEC technical committee 15:
Standards on specifications for electrical insulating materials.
This second edition cancels and replaces the first edition published in 1995 and
constitutes a technical revision.
The main changes from the previous edition are as follows: added application use and
safety statements. Reformatted document to bring it up to current IEC document format. Test
method references updated.
– 4 – 61212-2  IEC:2006(E)
The text of this standard is based on the following documents:

FDIS Report on voting
15/273/FDIS 15/306/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.

A bilingual version of this publication may be issued at a later date.
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.
61212-2  IEC:2006(E) – 5 –
INTRODUCTION
This part of IEC 61212 is one of a series which deals with industrial, rigid, round, laminated

tubes and rods based on thermosetting resins for electrical purposes. The materials are

similar to those described in IEC 62011-1 but of different cross-section.

This series, under the general heading Insulating materials – Industrial rigid round laminated

tubes and rods based on thermosetting resins for electrical purposes, consists of three parts:

Part 1: Definitions, designations and general requirements (IEC 61212-1)

Part 2: Methods of test (IEC 61212-2)

Part 3: Specifications for individual materials (IEC 61212-3)

– 6 – 61212-2  IEC:2006(E)
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES

AND RODS BASED ON THERMOSETTING RESINS

FOR ELECTRICAL PURPOSES –
Part 2: Methods of test
1 Scope
This part of IEC 61212 describes methods of test for the materials defined in IEC 61212-1.
Materials which conform to this specification meet established levels of performance.
However, the selection of a material by a user for a specific application should be based on
the actual requirements necessary for adequate performance in that application and not
based on this specification alone.
Safety warning:
It is the responsibility of the user of the methods contained or referred to in this document to
ensure that they are used in a safe manner.
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 60167:1964, Methods of test for the determination of the insulation resistance of solid
insulating materials
IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216-1:2001, Electrical insulating materials – Properties of thermal endurance – Part 1:
Ageing procedures and evaluation of test results
IEC 60216-2:2005, Electrical insulating materials – Thermal endurance properties – Part 2:

Determination of thermal endurance properties of electrical insulating materials – Choice of
test criteria
IEC 60243-1:1998, Electrical 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 60296:2003, Fluids for electrotechnical applications – Unused mineral oils for trans-
formers and switchgear
61212-2  IEC:2006(E) – 7 –
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and

vertical flame test methods
Amendment 1 (2003)
IEC 61212-1, Insulating materials – Industrial rigid round laminated tubes and rods based on

thermosetting resins for electrical purposes – Part 1: General requirements

IEC 61212-3 (all sheets), Insulating materials – Industrial rigid round laminated tubes and

rods based on thermosetting resins for electrical purposes – Part 3: Specifications for

individual materials
ISO 62:1999, Plastics – Determination of water absorption
ISO 178:2001, Plastics – Determination of flexural properties
ISO 604:2002, Plastics – Determination of compressive properties
ISO 1183-1:2004, Plastics – Methods for determining the density and relative density of non-
cellular plastics – Part 1: Immersion method, liquid pyknometer method and titration method
ISO 3611:1978, Micrometer callipers for external measurement
ISO 3599:1976, Vernier callipers reading to 0,1 and 0,05 mm
ISO 6906:1984, Vernier callipers reading to 0,02 mm
3 Conditioning of specimens
Unless otherwise specified, test specimens shall be conditioned immediately prior to testing
for at least 24 h in standard atmosphere B according to IEC 60212 at a temperature of 23 °C
± 2 K and a relative humidity of (50 ± 5) %.
Unless otherwise specified, each specimen shall be tested in the conditioning atmosphere or
the tests shall commence within 3 min of removal of each specimen from the conditioning
atmosphere.
Where testing at an elevated temperature is required in a specification sheet of IEC 61212-3,
test specimens shall be conditioned for 1 h at the elevated temperature immediately before
testing.
4 Dimensions
4.1 General
All dimensions shall be measured in the “as received” condition.
4.2 External diameter
4.2.1 Test apparatus
The external diameter of the tubes and rods shall be determined using one of the apparatus
listed below:
—————————
There exists a consolidated version 1.1 (2003) that includes IEC 60695-11-10 (1999) and its Amendment 1
(2003).
– 8 – 61212-2  IEC:2006(E)
a) Nominal external diameter ≤100 mm

An external screw type micrometer with an accuracy of ±0,02 mm or better, according to
ISO 3611, having faces with diameters between 6 mm and 8 mm.

b) Nominal external diameter >100 mm and ≤500 mm

A slide gauge (Vernier caliper) in accordance with ISO 3599.

c) Nominal external diameter >500 mm

A steel tape, graduated in divisions of 0,5 mm with an accuracy of ±0,1 mm or better.

Any other means of measurement with the same or better accuracy may be used. In case of
dispute, the specified apparatus shall be used.
4.2.2 Procedure
For tubes or rods with nominal external diameter ≤500 mm, measure the external diameter at
three points along the length, but not less than 20 mm from the ends, generally at both ends
and the middle. At each of these points, a minimum of three readings equally distributed
around the circumference shall be taken.
For tubes or rods with nominal external diameter >500 mm, measure the circumference at
three places along the length, distributed as above, and calculate the diameter.
4.2.3 Results
For nominal external diameters ≤100 mm, the measured values shall be recorded to the
nearest 0,02 mm.
For nominal external diameters >100 mm and ≤500 mm, the measured values shall be
recorded to the nearest 0,1 mm.
For nominal external diameters >500 mm, the diameters shall be calculated from the
measured circumferences and recorded to the nearest millimetre.
4.2.4 Report
The arithmetic mean of the recorded values shall be reported as the diameter of the tube or
rod.
4.3 Internal diameter
4.3.1 Test apparatus
The internal diameter of tubes shall be determined using one of the instruments listed below.
a) For tubes with nominal internal diameter ≤10 mm
A tapered plug gauge or pin type micrometer with an accuracy of ±0,02 mm or better.
b) For tubes with nominal internal diameter >10 mm and ≤ 500 mm
A slide gauge (Vernier caliper) in accordance with ISO 3599.

61212-2  IEC:2006(E) – 9 –
c) For tubes with nominal internal diameter >500 mm

A graduated steel tape to measure the external circumference in accordance with 4.2.1 c).

A slide gauge (Vernier caliper) to measure the wall thickness in accordance with 4 2.1. b).

Any other means of measurement having the same accuracy as specified above or better may

be used. In case of dispute, the specified apparatus shall be used.

4.3.2 Procedure
a) For tubes with nominal internal diameter ≤10 mm

Measure the internal diameter of the tube at both ends using a tapered plug gauge, or at
three points equally spaced around the inside circumference at both ends using a pin type
micrometer.
b) For tubes with nominal internal diameter >10 mm and ≤500 mm
Measure the internal diameter of the tube at a minimum of three points equally spaced
along the inside circumference at both ends.
c) For tubes with nominal internal diameter >500 mm
The internal diameter shall be calculated from the external diameter determined according
to 4.2 and the wall thickness determined according to 4.4.
4.3.3 Results
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge or pin
type micrometer, the values measured at the two ends shall be recorded to the nearest
0,02 mm.
For tubes with nominal internal diameter >10 mm and ≤500 mm, measured using a slide
gauge, the three values measured at the two ends shall be recorded to the nearest 0,1 mm.
For tubes with nominal internal diameter >500 mm, calculate the internal diameters using the
measured outside diameters and the corresponding measured wall thicknesses and record
the calculated values to the nearest millimetre.
4.3.4 Report
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge, the
arithmetic mean of the two values recorded shall be reported as the internal diameter of the
tube. For tubes with nominal internal diameter ≤10 mm measured using a pin type
micrometer, the arithmetic mean of the six values recorded shall be reported as the internal
diameter of the tube.
For tubes with nominal internal diameter >10 mm and ≤500 mm, the arithmetic mean of the
six recorded values shall be reported as the internal diameter of the tube.
For tubes with nominal internal diameter >500 mm, the arithmet
...

IEC 61212-2 ®
Edition 2.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes –
Part 2: Methods of test
Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base
de résines thermodurcissables, à usages électriques –
Partie 2: Méthodes d’essai
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IEC 61212-2 ®
Edition 2.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes –
Part 2: Methods of test
Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base
de résines thermodurcissables, à usages électriques –
Partie 2: Méthodes d’essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 29.035.01 ISBN 978-2-88910-446-8
– 2 – 61212-2 © IEC:2006
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Conditioning of specimens.7
4 Dimensions .7
4.1 General .7
4.2 External diameter .7
4.3 Internal diameter .8
4.4 Wall thickness .9
4.5 Departure from straightness – Applicable to all tubes up to 300 mm diameter .10
5 Mechanical tests.10
5.1 Flexural strength perpendicular to laminations.10
5.2 Axial compressive strength.12
5.3 Cohesion between layers .13
6 Electrical tests.15
6.1 Electric strength and breakdown voltage .15
6.2 Insulation resistance after immersion in water .17
6.3 Dissipation factor and permittivity (tube only) .17
7 Other tests .18
7.1 Thermal endurance .18
7.2 Water absorption.18
7.3 Density.18
7.4 Flammability.18
Bibliography.22

Figure 1 – Preparation of test specimen from a large tube for testing flexural strength.11
Figure 2 – Position of tube in testing machine for testing cohesion between layers .14
Figure 3 – Test specimens and electrodes for testing electric strength of tubes .16
Figure 4 – Test specimens for flammability testing.20

61212-2 © IEC:2006 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –
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 61212-2 has been prepared by IEC technical committee 15:
Standards on specifications for electrical insulating materials.
This second edition cancels and replaces the first edition published in 1995 and
constitutes a technical revision.
The main changes from the previous edition are as follows: added application use and
safety statements. Reformatted document to bring it up to current IEC document format. Test
method references updated.
– 4 – 61212-2 © IEC:2006
This bilingual version, published in 2009-06, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
15/273/FDIS 15/306/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.
61212-2 © IEC:2006 – 5 –
INTRODUCTION
This part of IEC 61212 is one of a series which deals with industrial, rigid, round, laminated
tubes and rods based on thermosetting resins for electrical purposes. The materials are
similar to those described in IEC 62011-1 but of different cross-section.
This series, under the general heading Insulating materials – Industrial rigid round laminated
tubes and rods based on thermosetting resins for electrical purposes, consists of three parts:
Part 1: Definitions, designations and general requirements (IEC 61212-1)
Part 2: Methods of test (IEC 61212-2)
Part 3: Specifications for individual materials (IEC 61212-3)

– 6 – 61212-2 © IEC:2006
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –
Part 2: Methods of test
1 Scope
This part of IEC 61212 describes methods of test for the materials defined in IEC 61212-1.
Materials which conform to this specification meet established levels of performance.
However, the selection of a material by a user for a specific application should be based on
the actual requirements necessary for adequate performance in that application and not
based on this specification alone.
Safety warning:
It is the responsibility of the user of the methods contained or referred to in this document to
ensure that they are used in a safe manner.
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 60167:1964, Methods of test for the determination of the insulation resistance of solid
insulating materials
IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216-1:2001, Electrical insulating materials – Properties of thermal endurance – Part 1:
Ageing procedures and evaluation of test results
IEC 60216-2:2005, Electrical insulating materials – Thermal endurance properties – Part 2:
Determination of thermal endurance properties of electrical insulating materials – Choice of
test criteria
IEC 60243-1:1998, Electrical 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 60296:2003, Fluids for electrotechnical applications – Unused mineral oils for trans-
formers and switchgear
61212-2 © IEC:2006 – 7 –
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
Amendment 1 (2003)
IEC 61212-1, Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes – Part 1: General requirements
IEC 61212-3 (all sheets), Insulating materials – Industrial rigid round laminated tubes and
rods based on thermosetting resins for electrical purposes – Part 3: Specifications for
individual materials
ISO 62:1999, Plastics – Determination of water absorption
ISO 178:2001, Plastics – Determination of flexural properties
ISO 604:2002, Plastics – Determination of compressive properties
ISO 1183-1:2004, Plastics – Methods for determining the density and relative density of non-
cellular plastics – Part 1: Immersion method, liquid pyknometer method and titration method
ISO 3611:1978, Micrometer callipers for external measurement
ISO 3599:1976, Vernier callipers reading to 0,1 and 0,05 mm
ISO 6906:1984, Vernier callipers reading to 0,02 mm
3 Conditioning of specimens
Unless otherwise specified, test specimens shall be conditioned immediately prior to testing
for at least 24 h in standard atmosphere B according to IEC 60212 at a temperature of 23 °C
± 2 K and a relative humidity of (50 ± 5) %.
Unless otherwise specified, each specimen shall be tested in the conditioning atmosphere or
the tests shall commence within 3 min of removal of each specimen from the conditioning
atmosphere.
Where testing at an elevated temperature is required in a specification sheet of IEC 61212-3,
test specimens shall be conditioned for 1 h at the elevated temperature immediately before
testing.
4 Dimensions
4.1 General
All dimensions shall be measured in the “as received” condition.
4.2 External diameter
4.2.1 Test apparatus
The external diameter of the tubes and rods shall be determined using one of the apparatus
listed below:
—————————
There exists a consolidated version 1.1 (2003) that includes IEC 60695-11-10 (1999) and its Amendment 1
(2003).
– 8 – 61212-2 © IEC:2006
a) Nominal external diameter ≤100 mm
An external screw type micrometer with an accuracy of ±0,02 mm or better, according to
ISO 3611, having faces with diameters between 6 mm and 8 mm.
b) Nominal external diameter >100 mm and ≤500 mm
A slide gauge (Vernier caliper) in accordance with ISO 3599.
c) Nominal external diameter >500 mm
A steel tape, graduated in divisions of 0,5 mm with an accuracy of ±0,1 mm or better.
Any other means of measurement with the same or better accuracy may be used. In case of
dispute, the specified apparatus shall be used.
4.2.2 Procedure
For tubes or rods with nominal external diameter ≤500 mm, measure the external diameter at
three points along the length, but not less than 20 mm from the ends, generally at both ends
and the middle. At each of these points, a minimum of three readings equally distributed
around the circumference shall be taken.
For tubes or rods with nominal external diameter >500 mm, measure the circumference at
three places along the length, distributed as above, and calculate the diameter.
4.2.3 Results
For nominal external diameters ≤100 mm, the measured values shall be recorded to the
nearest 0,02 mm.
For nominal external diameters >100 mm and ≤500 mm, the measured values shall be
recorded to the nearest 0,1 mm.
For nominal external diameters >500 mm, the diameters shall be calculated from the
measured circumferences and recorded to the nearest millimetre.
4.2.4 Report
The arithmetic mean of the recorded values shall be reported as the diameter of the tube or
rod.
4.3 Internal diameter
4.3.1 Test apparatus
The internal diameter of tubes shall be determined using one of the instruments listed below.
a) For tubes with nominal internal diameter ≤10 mm
A tapered plug gauge or pin type micrometer with an accuracy of ±0,02 mm or better.
b) For tubes with nominal internal diameter >10 mm and ≤ 500 mm
A slide gauge (Vernier caliper) in accordance with ISO 3599.
c) For tubes with nominal internal diameter >500 mm
A graduated steel tape to measure the external circumference in accordance with 4.2.1 c).
A slide gauge (Vernier caliper) to measure the wall thickness in accordance with 4 2.1. b).
Any other means of measurement having the same accuracy as specified above or better may
be used. In case of dispute, the specified apparatus shall be used.

61212-2 © IEC:2006 – 9 –
4.3.2 Procedure
a) For tubes with nominal internal diameter ≤10 mm
Measure the internal diameter of the tube at both ends using a tapered plug gauge, or at
three points equally spaced around the inside circumference at both ends using a pin type
micrometer.
b) For tubes with nominal internal diameter >10 mm and ≤500 mm
Measure the internal diameter of the tube at a minimum of three points equally spaced
along the inside circumference at both ends.
c) For tubes with nominal internal diameter >500 mm
The internal diameter shall be calculated from the external diameter determined according
to 4.2 and the wall thickness determined according to 4.4.
4.3.3 Results
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge or pin
type micrometer, the values measured at the two ends shall be recorded to the nearest
0,02 mm.
For tubes with nominal internal diameter >10 mm and ≤500 mm, measured using a slide
gauge, the three values measured at the two ends shall be recorded to the nearest 0,1 mm.
For tubes with nominal internal diameter >500 mm, calculate the internal diameters using the
measured outside diameters and the corresponding measured wall thicknesses and record
the calculated values to the nearest millimetre.
4.3.4 Report
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge, the
arithmetic mean of the two values recorded shall be reported as the internal diameter of the
tube. For tubes with nominal internal diameter ≤10 mm measured using a pin type
micrometer, the arithmetic mean of the six values recorded shall be reported as the internal
diameter of the tube.
For tubes with nominal internal diameter >10 mm and ≤500 mm, the arithmetic mean of the
six recorded values shall be reported as the internal diameter of the tube.
For tubes with nominal internal diameter >500 mm, the arithmetic mean of the recorded
values shall be reported as the internal diameter of the tube.
4.4 Wall thickness
4.4.1 Test apparatus
The wall thickness of the tube shall be measured using a pin type micrometer, or universal
micrometer according to ISO 3611, or a suitable Vernier caliper reading to 0,02 mm according
to ISO 6906.
Any other means of measurement having the same accuracy as specified above or better may
be used. In case of dispute, the specified apparatus shall be used.
4.4.2 Procedure
Measure the wall thickness of the tube at a minimum of three points equally spaced around
the circumference at each end of the tube.

– 10 – 61212-2 © IEC:2006
4.4.3 Results
Record the measured values to the nearest 0,02 mm.
4.4.4 Report
Report the arithmetic mean of the values recorded as the wall thickness of the tube.
4.5 Departure from straightness – Applicable to all tubes up to 300 mm diameter
4.5.1 Test specimens
The test specimen shall be the tube under test. Where appropriate, the tube shall be trimmed
to length in order to remove excess resin or flashing from the ends prior to carrying out the
test.
4.5.2 Procedure
The length of the tube or rod shall be measured with an accuracy of ±1 mm and recorded. The
tube or rod shall then be placed on a flat, horizontal surface and rolled until the maximum gap
occurs between it and the flat surface. The tube or rod shall be maintained in this position
without applying any pressure that could deform it. The maximum gap shall be measured
using feeler or slip gauges.
4.5.3 Results
Record the measured value in millimetres to the nearest 0,1 mm as the departure from
straightness of the rod or tube under test. The limit for departure of straightness as a function
of length is given in IEC 61212-3.
4.5.4 Report
Report the value obtained in millimetres as the departure from straightness together with the
length.
5 Mechanical tests
5.1 Flexural strength perpendicular to laminations
The flexural strength shall be determined by the method specified in ISO 178.
NOTE 1 This method provides information, which is useful for the specification of materials, but the information
should not be used for structural calculations. Preparation of specimens may release residual stresses in the tube
or rod and the results may not correlate with the true flexural properties.
NOTE 2 For the materials described in this standard, the flexural strength and the flexural stress at rupture can
be regarded as identical properties.
5.1.1 Test specimens
Three specimens shall be tested.
5.1.1.1 Tubes
The test is applicable to tubes of nominal internal diameter greater than 100 mm and other
tubes from which satisfactory specimens as defined below can be produced. In the case of
moulded tubes with visible mould closing lines, at least one specimen shall be cut from the
region of each mould-closing line.
The test specimens shall be of rectangular cross-section and shall be cut from the wall of the
tube. The length axis of the specimens shall be parallel to the main axis of the tube. The

61212-2 © IEC:2006 – 11 –
dimensions of the specimens shall be as described in ISO 178. The thickness shall lie
between 3 mm and 5 mm. The preferred thickness is 4 mm.
The other specimen dimensions shall be as described in ISO 178. See Figure 1.

h
L
b
IEC  425/06
Figure 1 – Preparation of test specimen from a large tube for testing flexural strength
5.1.1.2 Rods
Each specimen shall be a piece of rod under test except that, if the diameter of the rod
exceeds 13 mm, it shall be reduced concentrically to (13 ± 1) mm by machining. The length of
each specimen shall be not less than 20 times its diameter.
5.1.2 Procedure
5.1.2.1 Tubes
Perform the test as described in ISO 178.
The cross-head speed shall be (5 ± 1) mm/min.
5.1.2.2 Rods
The diameter of the test specimen shall be measured according to 4.2.1.
The length of the span, L, shall be (16 ± 1) D (D = diameter of the rod or the diameter of the
test specimen cut from the rod). The length of the span shall be measured to the nearest
0,5 mm.
Load the test specimen as a simple beam at mid-span without impact.
The cross-head speed shall be (5 ± 1) mm/min.
Record the load, F, at the moment of rupture.
5.1.3 Results
5.1.3.1 Tubes
Calculate the flexural strength of the rectangular specimens as described in ISO 178 and
record the three results obtained in MPa.
5.1.3.2 Rods
σ , the flexural stress at load F, is calculated in MPa from the formula:
F
– 12 – 61212-2 © IEC:2006
M
σ =
F
W
where
W is the section modulus, in m ;
M is the flexural moment at load F, given by the formula:
FL
M =
where
F is the load at the moment of rupture in MN;
L is the span length in m.
For round specimens with diameter D:
πD
W =
Calculate the flexural strength of the specimens and record the three results obtained in MPa.
5.1.4 Report
Report the arithmetic mean of the recorded values as the flexural strength in MPa of the tube
or rod under test. The maximum and minimum values shall also be reported.
5.2 Axial compressive strength
5.2.1 General
Axial compressive strength shall be determined by the method specified in ISO 604.
5.2.2 Test specimens
Three specimens shall be tested.
The specimens shall be as described in ISO 604.
Each test specimen shall be a tube or cylinder. The ends shall be flat, parallel and 90º to the
axis. If the size of the tube or rod under test necessitates loads beyond the capacity of the
testing machine or the compression tool, smaller specimens shall be prepared in one of the
following ways:
– rods:
by concentric machining of the original rod;
– tubes:
either by reducing the wall thickness by concentric machining or by machining from the
wall of the tube under test in accordance with the recommended dimensions given in
Table 2 of ISO 604 for a type B specimen.

61212-2 © IEC:2006 – 13 –
5.2.3 Procedure
Three specimens shall be tested in the 'as received' condition as described in ISO 604, but
with a rate of deformation as modified below.
For cylindrical specimens, determine the specimen height, and the diameter according
to 5.1.1.2.
For tubular specimens, determine the external and internal diameter according to 5.1.1.1.
For rectangular specimens cut from tubes, determine the dimensions of the two sides of the
cross-section in accordance with ISO 604. From these values, calculate the minimum cross-
sectional area of each of the three specimens.
Place the test specimen between the compression plates ensuring that the ends are parallel
to and make good contact with the surfaces of the plates. Align the centre line of the
specimen through the centre line of the compression tool. Adjust the machine so that the
surfaces of the compression plate just touch the ends of the test specimen.
Set the machine speed to a rate of deformation in mm/min equal to (0,3 × L) ± 20 %, where L
is the length of the specimen in millimetres.
Start the machine and record the total load, in newtons, carried by the test specimen at the
moment of rupture.
5.2.4 Results
Calculate the compressive strength in MPa by dividing the load at the moment of rupture in N
by the original cross-sectional area in mm to three significant figures.
5.2.5 Report
Report the arithmetic mean of the three individual results as the compressive strength at
rupture in axial direction of the tube or rod under test.
5.3 Cohesion between layers
5.3.1 Test specimens
This test is applicable only to tubes of nominal internal diameter ≤100 mm, and with the ratio
of internal diameter to external diameter (d/D) between 0,70 and 0,90.
Tubes of larger diameter and tubes with a ratio d/D less than 0,7 may be tested after
concentric machining to the prescribed dimensions. In such cases the preferred ratio d/D is 0,8.
In the case of moulded tubes, make a reference line, parallel to the axis, on the external
surface of the tube indicating the position of one of the mould-closing lines. If the tube has no
visible mould-closing lines, the reference line can be marked at any position on the surface.
Cut two test specimens of nominal length equal to the measured external diameter of the tube
under test. The tolerance on this length shall be (1 % of the measured external diameter)
± 0,5 mm.
If it is necessary to further reduce the testing force to enable the test to be carried out, the
length of the specimen may be reduced to a minimum of 50 mm + (1 % of the measured
external diameter) ± 0,5 mm.
– 14 – 61212-2 © IEC:2006
5.3.2 Procedure
Perform the test in accordance with 5.2 modified as follows.
Measure the internal diameter, d, the external diameter, D, and the wall thickness, t, in
accordance with Clause 4. Place the test specimen between the steel plates of the
compression test machine so that its axis is normal to the applied force (see Figure 2).
Start the machine and increase the compressive force at a uniform speed which has been
chosen to cause failure within 15 s to 45 s. Record the maximum force, F (in N), at the
moment of rupture.
In the case of moulded tubes, test one specimen with the applied force in the plane containing
the reference line and test the second specimen with the applied force perpendicular to that
plane.
IEC  426/06
Figure 2 – Position of tube in testing machine for testing cohesion between layers
5.3.3 Results
If the length of the specimen is equal to the external diameter of the tube, calculate the
cohesion between layers, σ (in MPa), for each test specimen from the following expression:
c
F
σ =
c
t
where
F is the maximum force at the moment of rupture, in N;
t is the wall thickness, in mm.
NOTE Use of the simplified expression F/t gives an approximation to the true value of the cohesion between
layers, which is adequate for the purpose of this control test when the standard specimen format is used.
A more precise value may be calculated using the following expression.
The following formula shall be used when the length of the specimen is not equal to the
external diameter.
3F (D + d )
πLd (D −d )
where
D is the external diameter in mm;
d is the internal diameter in mm;
L is the length of specimen in mm;

61212-2 © IEC:2006 – 15 –
F is the maximum force at the moment of rupture in N.
5.3.4 Report
The lower of the two individual results shall be taken as the cohesion between layers of the
tube under test.
In case of dispute the more precise formula shall be used.
6 Electrical tests
6.1 Electric strength and breakdown voltage
6.1.1 General
The electric strength perpendicular to laminations of tubes and rods shall be determined using
either the 20 s step-by-step test or the one-minute proof test as described in IEC 60243-1.
Unless otherwise specified, the tests shall be carried out in clean mineral oil, which is in
accordance with IEC 60296.
6.1.2 Test specimens
6.1.2.1 Test specimens for breakdown voltage tests parallel to laminations
Three specimens shall be tested.
The test specimens shall be of a length of (25 ± 0,2) mm cut from the tube or rod. The test
specimen ends shall be smooth, parallel planes perpendicular to the axis of the tube or rod.
For rods the test specimen shall be a piece of rod. For tubes ≤75 mm nominal external
diameter, the test specimen shall be a ring of tube. For tubes >75 mm nominal external
diameter, the test specimen shall be a portion of a ring with an outer circumferential length of
(100 ± 10) mm.
6.1.2.2 Test specimens for electric strength tests perpendicular to laminations
Three specimens shall be tested.
The test specimen shall be a piece of tube of length ≥100 mm.
For tubes of nominal internal diameter ≤100 mm, the outer electrode shall be a band of metal
foil, (25 ± 1) mm wide, wrapped tightly around the tube symmetrically with respect to the ends
of the tube.
The inner electrode shall be a closely fitting metal conductor (rod, tube, metal foil) or a
packing of metal spheres (0,75 mm to 2,0 mm in diameter) making good contact with the inner
surface of the tube. The ends of the inner electrode shall extend for at least 25 mm beyond
the ends of the outer electrode (see Figure 3a).
For tubes of nominal internal diameter >100 mm, the outer electrode shall be a band of metal
foil, (75 ± 1) mm wide, wrapped tightly around the outside of the tube, symmetrically with
respect to the inner electrode.
The inner electrode shall be a disc of metal foil, (25 ± 1) mm in diameter, arranged
symmetrically with respect to the tube length, and flexible enough to conform to the inner
surface of the tube (see Figure 3b).

– 16 – 61212-2 © IEC:2006
Metal foil Inner
electrode electrode
Diameter
not greater
than
100 mm
Test
25 mm ± 1 mm
piece
IEC  427/06
Figure 3a – For tubes with an inside diameter ≤100 mm

Metal foil
electrodes
25 mm
Diameter
greater
than
100 mm
Test
75 mm ± 1 mm
piece
IEC  428/06
Figure 3b – For tubes with an inside diameter >100 mm
Figure 3 – Test specimens and electrodes for testing electric strength of tubes
6.1.3 Procedure
Perform the tests at 90 °C ± 2 K using the chosen test method as described in IEC 60243-1.
6.1.4 Results
Record the measured values of the breakdown voltage in kV.
Calculate and record the values of the electric strength in kV/mm.
6.1.5 Report
Report the arithmetic mean of the recorded values of breakdown voltage in kV and of electric
strength in kV/mm.
61212-2 © IEC:2006 – 17 –
The maximum and minimum values shall also be reported.
6.2 Insulation resistance after immersion in water
6.2.1 General
Insulation resistance after immersion in water shall be determined by the taper-pin method
specified in IEC 60167. The test is not applicable to tubes with an internal diameter less than
20 mm or greater than 25 mm wall thickness and to rods with an external diameter less than
20 mm or greater than 25 mm. Large rods may be reduced in diameter to 25 mm by
concentric machining to facilitate testing. Large tubes may be reduced in wall thickness to
25 mm by concentric machining.
6.2.2 Specimens
Two tests shall be made on specimens cut from the rod or tube under test. Holes suitable for
the insertion of taper pins shall be machined into each specimen.
Before cutting, the external surface of the tube or rod shall be marked with a reference line
parallel to the main axis. The material used to apply the reference line shall be chosen so that
it will not affect the results. In case of rods and moulded tubes with visible mould-closing
lines, the reference line shall coincide with one of the mould-closing lines.
For rods, two specimens of length (75 ± 5) mm shall be cut from the original rod.
For tubes, two specimens of length (75 ± 5) mm shall be cut from the original tube.
For tubes of more than 75 mm internal diameter, the specimens may be (75 ± 5) mm
segments cut from the wall of the tube with a developed width of (50 ± 5) mm, or the test may
be made on a single specimen by inserting one set of taper pins on the reference line and
another set of taper pins positioned at 90° to the first set.
In all other cases, the sets of specimens shall be machined so that the taper pins are inserted
along the reference line for the first specimen and at 90° to the reference line for the second
specimen.
6.2.3 Procedure
Heat the test specimens for (24 ± 1) h in an oven at 50 °C ± 2 K, cool to room temperature
and then immerse for (24 ± 1) h in distilled water or water of equivalent purity, at a
temperature of 23 °C ± 2 K. Remove the test specimens from the water and wipe them dry
with a clean cloth or filter paper. Insert the taper pins and measure the insulation resistance
at 25 °C ± 10 K in an atmosphere of not more than 75 % relative humidity.
Apply the voltage between 0,5 min and 1,0 min after removing the test specimens from the
water, and measure the insulation resistance after 1,0 min of applied voltage.
6.2.4 Results
Record the lower of the two individual readings.
6.2.5 Report
Report the recorded value as the insulation resistance after immersion in water of the tube or
rod under test in MΩ.
6.3 Dissipation factor and permittivity (tube only)
Dissipation factor and permittivity shall be determined by the method specified in IEC 60250.
The test specimens shall be subjected to conditioning as specified in IEC 61212-3.

– 18 – 61212-2 © IEC:2006
Report the results as described in IEC 60250.
7 Other tests
7.1 Thermal endurance
The thermal endurance shall be measured as described in IEC 60216-1.
The ageing procedure shall comply with IEC 60216-1, Clause 7, and the property to be tested
shall be flexural strength according to ISO 178, as specified in IEC 60216-2, Rigid materials A.
A 50 % reduction of the initial value is taken as the end-point; diagnostic tests shall be carried
out at 23 °C ± 5 K.
Report the results according to IEC 60216-1, Clause 7.
7.2 Water absorption
7.2.1 General
Water absorption shall be determined by method 1 of ISO 62.
7.2.2 Specimens
Three test specimens shall be prepared in accordance with 5.4 of ISO 62.
7.2.3 Procedure
Perform the test in accordance with method 1 of ISO 1642 (see Bibliography).
7.2.4 Results
For each test specimen, calculate and record the water absorption per unit of total surface
area in mg/cm .
7.2.5 Report
Report the arithmetic mean of the recorded values in mg/cm as the water absorption of the
tube or rod under test.
7.3 Density
Density shall be determined by method A specified in ISO 1183-1.
Report the results as described in ISO 1183-1.
7.4 Flammability
7.4.1 General
Flammability shall be determined according to method B given in IEC 60695-11-10.
7.4.2 Specimens
7.4.2.1 General
Ten bar specimens shall be cut from the tube or rod, or from a test panel produced using the
same batch of pre-preg as used to produce the tube or rod.

61212-2 © IEC:2006 – 19 –
7.4.2.2 Tube
Cut the specimens from a tube with an external diameter of 50 mm or greater and with a wall
thickness of (3 ± 0,2) mm. Where the wall thickness of the tube exceeds this value, reduce
the wall thickness to (3 ± 0,2) mm by concentric machining of the tube before cutting the
specimens.
Cut specimens of width (13 ± 0,5) mm from wall of the tube as shown in Figure 4a.
Ensure that the specimens are free from dust or contamination.
7.4.2.3 Rod
Cut specimens from a rod with a diameter greater than 16 mm as shown in Figure 4b.
Ensure that the specimens are free from dust or contamination.

– 20 – 61212-2 © IEC:2006
3 mm ± 0,2 mm
125 mm ± 0,5 mm
IEC  429/06
Figure 4a – Test specimen for flammability test cut from tube
3 mm ± 0,2 mm
125 mm ± 0,5 mm
IEC  430/06
Figure 4b – Test specimen for flammability test cut from rod
Figure 4 – Test specimens for flammability testing

13 mm ± 0,5 mm
50 mm min.
13 mm ± 0,5 mm
61212-2 © IEC:2006 – 21 –
7.4.2.4 Alternative production of test specimen
Where it is not possible to machine satisfactory specimens from the tube or rod, test pieces
may be produced from flat sheet of thickness (3 ± 0,2) mm, pressed using the same batch of
pre-preg used to manufacture the rod or tube. In such cases, the specimens shall be in the
shape of rectangular bar specimens as described in IEC 60695-11-10 method B.
Ensure that the specimens are free from dust or contamination.
7.4.3 Procedure
Perform the tests in accordance with IEC 60695-11-10.
7.4.4 Report
Report the assigned classification in accordance with IEC 60695-11-10.

– 22 – 61212-2 © IEC:2006
Bibliography
ISO 1642:1987, Plastics – Industrial laminated sheets based on thermosetting resins –
Specification
⎯⎯⎯⎯⎯⎯
—————————
This standard has been withdrawn.

– 24 – 61212-2 © CEI:2006
SOMMAIRE
AVANT-PROPOS.25
INTRODUCTION.27
1 Domaine d’application .28
2 Références normatives.28
3 Conditionnement des éprouvettes.29
4 Dimensions .
...