SIST EN 60763-2:2007

SLOVENSKI STANDARD
01-november-2007
1DGRPHãþD
SIST EN 60763-2:1998
Specifikacija za laminirani prešpan – 2. del: Preskušalne metode (IEC 60763-
2:2007)
Specification for laminated pressboard -- Part 2: Methods of test (IEC 60763-2:2007)
Bestimmung für Blockspan -- Teil 2: Prüfverfahren (IEC 60763-2:2007)
Spécification pour cartons comprimés et contrecollés -- Partie 2: Méthodes d'essai (IEC
60763-2:2007)
Ta slovenski standard je istoveten z: EN 60763-2:2007
ICS:
29.035.10 Papirni in kartonski izolacijski Paper and board insulating
materiali materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60763-2
NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM
ICS 17.220.99; 29.035.10 Supersedes EN 60763-2:1996

English version
Specification for laminated pressboard -
Part 2: Methods of test
(IEC 60763-2:2007)
Spécification pour cartons comprimés  Bestimmung für Blockspan -
et contrecollés - Teil 2: Prüfverfahren
Partie 2: Méthodes d'essai (IEC 60763-2:2007)
(CEI 60763-2:2007)
This European Standard was approved by CENELEC on 2007-03-01. 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, Bulgaria, 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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60763-2:2007 E
Foreword
The text of document 15/360/FDIS, future edition 2 of IEC 60763-2, prepared by IEC TC 15, Solid
electrical insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60763-2 on 2007-03-01.
This European Standard supersedes EN 60763-2:1996.
– the standard has generally been revised editorially and brought into line with EN 60641-2;
– the test method for the determination of the internal ply strength has been replaced with an alternative
method;
– the test method for the determination of the thermal resistance has been enlarged in its scope.
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) 2007-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60763-2:2007 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60763-2:2007
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 60243-1 1998 Electrical strength of insulating materials - EN 60243-1 1998
Test methods -
Part 1: Tests at power frequencies

IEC 60247 2004 Insulating liquids - Measurement of relative EN 60247 2004
permittivity, dielectric dissipation factor (tan d)
and d.c. resistivity
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 60641-2 2004 Pressboard and presspaper for electrical EN 60641-2 2004
purposes -
Part 2: Methods of tests
IEC 60763-1 1983 Specification for laminated pressboard - EN 60763-1 1996
Part 1: Definitions, classification and general
requirements
IEC 61125 1992 Unused hydrocarbon-based insulating
+ corr. September 1992 liquids - Test methods for evaluating the EN 61125 1993
oxidation stability
IEC 62021-1 2003 Insulating liquids - Determination of acidity - EN 62021-1 2003
Part 1: Automatic potentiometric titration

ISO 287 1985 Paper and board - Determination of moisture EN 20287 1994
content - Oven-drying method
ISO 2144 1997 Paper, board and pulps - Determination of - -
residue (ash) on ignition at 900 degrees C

INTERNATIONAL IEC
STANDARD 60763-2
Second edition
2007-02
Specification for laminated pressboard –
Part 2:
Methods of test
© IEC 2007 ⎯ 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 R
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60763-2 © IEC:2007(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Conditioning of test specimens .8
4 Drying of test specimens .8
4.1 Method A (preferable) .8
4.2 Method B.8
5 Dimensions .8
5.1 Thickness.8
6 Mechanical tests.9
6.1 Flexural strength and load to produce a standard deflection .9
6.2 Apparent modulus of elasticity in flexure .10
7 Compressibility.10
7.1 Principle.10
7.2 Test apparatus .11
7.3 Test pieces.11
7.4 Procedure .11
7.5 Results.11
8 Electric strength in oil .12
8.1 General and conditioning.12
8.2 Electric strength along laminate (edgewise electric strength).12
9 Internal ply strength, thermal resistance and oil compatibility .12
9.1 Principle.12
9.2 Test specimens .12
9.3 Test apparatus .13
9.4 Procedure .13
9.5 Determination of the flexural strength.13
9.6 Results.13
10 Apparent density .14
10.1 Test specimens .14
10.2 Procedure .14
10.3 Results.14
11 Moisture content.15
12 Shrinkage in air after drying.15
12.1 Test specimens .15
12.2 Procedure .15
12.3 Results.15
13 Oil absorption.15
13.1 Test specimens .15
13.2 Procedure .15
13.3 Results.16
14 Ash content .16
14.1 Procedure .16

60763-2 © IEC:2007(E) – 3 –
14.2 Results.16
15 Contamination of liquid dielectrics .16
15.1 Apparatus.16
15.2 Test specimens .16
15.3 Procedure .17
15.4 Results.17
16 Conductivity of aqueous extract.17
16.1 Procedure .17
16.2 Results.17
17 pH of aqueous extract .17

Figure 1 – Position of test specimen in relation to length, width and thickness of sheet .17
Figure 2 – Size of the test specimens and arrangement of the electrodes for testing the
electric strength along laminae (edgewise electric strength).18
Figures 3 and 4 – Alternative forms of vented electrodes .19

Table 1 – Number of test specimens .13

– 4 – 60763-2 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SPECIFICATION FOR LAMINATED PRESSBOARD –

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 60763-2 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 1991 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition.
a) The standard has generally been revised editorially and brought into line with
IEC 60641-2.
b) The test method for the determination of the internal ply strength has been replaced with
an alternative method.
c) The test method for the determination of the thermal resistance has been enlarged in its
scope.
60763-2 © IEC:2007(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
15/360/FDIS 15/373/RVD
Full information on the voting for the approval of this part can be found in the report on voting
indicated in the above table.
The list of all parts of the IEC 60763 series, under the general title Specification for laminated
pressboard, can be found on the IEC website.
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.

– 6 – 60763-2 © IEC:2007(E)
INTRODUCTION
This International Standard deals with laminated pressboard as defined in Clause 2 of
IEC 60763-1.
IEC 60641 applies to pressboard which is not laminated, and the material covered by this
International Standard is made from sheets conforming to the requirements of that
publication.
60763-2 © IEC:2007(E) – 7 –
SPECIFICATION FOR LAMINATED PRESSBOARD –

Part 2: Methods of test
1 Scope
This part of IEC 60763 gives methods of test applicable for the material classified in
IEC 60763-1.
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 60243-1:1998, Electrical strength of insulating materials – Test methods – Part 1: Tests
at power frequencies
IEC 60247:2004, Insulating liquids – Measurement of relative permittivity, dielectric
dissipation factor (tan δ) and d.c. resistivity
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 insulating oils for
transformers and switchgear
IEC 60641-2:2004, Pressboard and presspaper for electrical purposes – Part 2: Methods of
tests
IEC 60763-1:1983, Specification for laminated pressboard – Part 1: Definitions, classification
and general requirements
IEC 61125:1992, Unused hydrocarbon-based insulating liquids – Test methods for evaluating
the oxidation stability
IEC 62021-1:2003, Insulating liquids – Determination of acidity – Part 1: Automatic
potentiometric titration
ISO 287:1985, Paper and board – Determination of moisture content – Oven-drying method
ISO 2144:1997, Paper, board and pulps – Determination of residue (ash) on ignition at 900
degrees C
– 8 – 60763-2 © IEC:2007(E)
3 Conditioning of test specimens
Since the conditioning of laminated pressboard is very time-consuming, the material is tested
either as received or dried. Only in case of dispute shall the material be conditioned according
to the following procedure.
The conditioning shall be made at 23 °C ± 2 K and (50 ± 5) % relative humidity until the
moisture content of the specimen reaches 5,5 % to 8 %. The conditioning shall be approached
from the dry side after drying at 70 °C ± 5 K for a period sufficient to ensure that the
conditioning atmosphere produces a mass increase in the specimen.
4 Drying of test specimens
4.1 Method A (preferable)
The test specimens shall be dried at 105 °C ± 2 K for (24 ± 1) h in an oven with forced air
circulation and subsequently at 105 °C ± 2 K for (48 ± 2) h in a vacuum chamber at a residual
pressure of not more than 1 kPa. The specimens shall then be removed and allowed to cool in
a desiccator before the test.
4.2 Method B
Test specimens shall be dried in a ventilated oven at 105 °C ± 2 K for (168 ± 8) h at
atmospheric pressure. When test pieces of the specified size are dried according to method
B, test results similar to the test results obtained after drying according to method A may be
expected.
5 Dimensions
5.1 Thickness
5.1.1 Test apparatus
An external screw-type micrometer having measuring faces of 6 mm to 8 mm diameter shall
be used for testing. The measuring faces shall be flat to within 0,001 mm and parallel to
within 0,003 mm. The micrometer shall be graduated in divisions of 0,01 mm and have an
accuracy of ± 0,005 mm. The pressure exerted on the specimens shall be 0,
...