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

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.

Isolierstoffe - Runde Rohre und Stäbe aus technischen Schichtpressstoffen auf der Basis warmhärtender Harze für elektrotechnische Zwecke - Teil 2: Prüfverfahren

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.

Izolacijski materiali – Industrijske toge okrogle laminirane cevi in palice na temelju termično utrjenih smol za električne namene – 2. del: Preskušalne metode (IEC 61212-2:2006)

General Information

Status
Published
Publication Date
27-Sep-2007
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Sep-2007
Due Date
18-Nov-2007
Completion Date
28-Sep-2007

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SLOVENSKI STANDARD
SIST EN 61212-2:2007
01-november-2007
1DGRPHãþD
SIST EN 61212-2:1998

,]RODFLMVNLPDWHULDOL±,QGXVWULMVNHWRJHRNURJOHODPLQLUDQHFHYLLQSDOLFHQDWHPHOMX

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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)

Isolierstoffe - Runde Rohre und Stäbe aus technischen Schichtpressstoffen auf der Basis

warmhärtender Harze für elektrotechnische Zwecke - Teil 2: Prüfverfahren (IEC 61212-

2:2006)

Matériaux isolants - Tubes et barres industriels, rigides, ronds, stratifiés, a base de

résines thermodurcissables, a usages électriques -- Partie 2: Méthodes d'essai (IEC

61212-2:2006)
Ta slovenski standard je istoveten z: EN 61212-2:2006
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
SIST EN 61212-2:2007 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 61212-2
NORME EUROPÉENNE
December 2006
EUROPÄISCHE NORM
ICS 29.035.01 Supersedes EN 61212-2:1996
English version
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)
Matériaux isolants - Isolierstoffe -
Tubes et barres industriels, rigides, Runde Rohre und Stäbe aus
ronds, stratifiés, à base de résines technischen Schichtpressstoffen
thermodurcissables, à usages électriques auf der Basis warmhärtender Harze
für elektrotechnische Zwecke
Partie 2: Méthodes d'essai
(CEI 61212-2:2006) Teil 2: Prüfverfahren
(IEC 61212-2:2006)

This European Standard was approved by CENELEC on 2006-11-01. 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 61212-2:2006 E
---------------------- Page: 2 ----------------------
EN 61212-2:2006 - 2 -
Foreword

The text of document 15/273/FDIS, future edition 2 of IEC 61212-2, prepared by IEC TC 15, Solid

electrical insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by

CENELEC as EN 61212-2 on 2006-11-01.
This European Standard supersedes EN 61212-2:1996.
The main changes from EN 61212-2:1996 are as follows:
– added application use and safety statements;
– reformatted document to bring it up to current IEC document format;
– test method references updated.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-08-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-11-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 61212-2:2006 was approved by CENELEC as a European

Standard without any modification.
__________
---------------------- Page: 3 ----------------------
- 3 - EN 61212-2:2006
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 60167 1964 Methods of test for the determination of the HD 568 S1 1990
insulation resistance of solid 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 60216-1 2001 Electrical insulating materials - Properties of EN 60216-1 2001
thermal endurance
Part 1: Ageing procedures and evaluation of
test results
IEC 60216-2 2005 Electrical insulating materials - Thermal EN 60216-2 2005
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 - 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 60296 2003 Fluids for electrotechnical applications - EN 60296 2004
Unused mineral insulating oils for + corr. September 2004
transformers and switchgear
IEC 60695-11-10 1999 Fire hazard testing EN 60695-11-10 1999
A1 2003 Part 11-10: Test flames - 50 W horizontal and A1 2003
vertical flame test methods
1) 2)
IEC 61212-1 - Insulating materials - Industrial rigid round EN 61212-1 2006
laminated tubes and rods based on
thermosetting resins for electrical purposes
Part 1: Definitions, designations and general
requirements
Undated reference.
Valid edition at date of issue.
---------------------- Page: 4 ----------------------
EN 61212-2:2006 - 4 -
Publication Year Title EN/HD Year

IEC 61212-3 Series Insulating materials - Industrial rigid round EN 61212-3 Series

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 EN ISO 62 1999
ISO 178 2001 Plastics - Determination of flexural properties EN ISO 178 2003
ISO 604 2002 Plastics - Determination of compressive EN ISO 604 2003
properties

ISO 1183-1 2004 Plastics - Methods for determining the density EN ISO 1183-1 2004

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 - -
---------------------- Page: 5 ----------------------
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: +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 S
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 6 ----------------------
– 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

---------------------- Page: 7 ----------------------
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.
---------------------- Page: 8 ----------------------
– 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.
---------------------- Page: 9 ----------------------
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)
---------------------- Page: 10 ----------------------
– 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
---------------------- Page: 11 ----------------------
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).
---------------------- Page: 12 ----------------------
– 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.
---------------------- Page: 13 ----------------------
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 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.
---------------------- Page: 14 ----------------------
– 10 – 61212-2  IEC:2006(E)

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.
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.
---------------------- Page: 15 ----------------------
61212-2  IEC:2006(E) – 11 –
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

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. Se
...

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