IEC 60641-3-1:2008

IEC 60641-3-1
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 3: Specifications for individual materials – Sheet 1: Requirements for
pressboard, types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3
and B.6.1
Carton comprimé et papier comprimé à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 1: Exigences pour
les cartons comprimés, types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3,
B.5.1, B.5.3 et B.6.1
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IEC 60641-3-1
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 3: Specifications for individual materials – Sheet 1: Requirements for
pressboard, types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3
and B.6.1
Carton comprimé et papier comprimé à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 1: Exigences pour
les cartons comprimés, types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3,
B.5.1, B.5.3 et B.6.1
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
L
CODE PRIX
ICS 29.035.10 ISBN 2-8318-9897-8
– 2 – 60641-3-1 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Designation (according to IEC 60641-1) .6
4 Requirements .6

Table 1 – Requirements for pressboard types B.0, B.2 and B.3.7
Table 2 – Pressboard types B.4, B.5 and B.6.10

60641-3-1 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 1: Requirements for pressboard, types B.0.1, B.0.3, B.2.1,
B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3 and B.6.1

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
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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
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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
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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.
IEC 60641-3-1 has been prepared by IEC technical committee 15: Solid electrical insulating
materials.
This second edition cancels and replaces the first edition published in 1992. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
– requirements for types B.0.3 and B.5.3 were added;
– the precompressed type B.3.1 was divided in B.3.1A and B.3.1B (higher flexibility);
– types B.6.1 has been replaced with a new type, but the designation has been kept;
– type B.7.1 has been deleted;
– the thickness relation of the properties has been simplified;

– 4 – 60641-3-1 © IEC:2008
– the values were adjusted to today's needs of users.
The text of this standard is based on the following documents:

CDV Report on voting
15/390/CDV 15/439/RVC
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 list of all the parts in the IEC 60641 series, under the general title Pressboard and
presspaper for electrical purposes, 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.
60641-3-1 © IEC:2008 – 5 –
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 1: Requirements for pressboard, types B.0.1, B.0.3, B.2.1,
B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3 and B.6.1

1 Scope
This International Standard gives the requirements for pressboard for electrical purposes
comprised of 100 % sulphate wood pulp or a mixture of sulphate wood pulp and cotton.
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 60641-1:2008, Pressboard and presspaper for electrical purposes – Part 1: Definitions
and general requirements
IEC 60641-2:2004, Pressboard and presspaper for electrical purposes – Part 2: Methods of
test
– 6 – 60641-3-1 © IEC:2008
3 Designation (according to IEC 60641-1)
Type Composition Description Table
B.0.1 100 % sulphate wood pulp Pressboard of particularly high chemical 1
purity.
B.0.3 Mixture of sulphate wood pulp and
cotton
B.2.1 100 % sulphate wood pulp Pressboard characterized by high chemical 1
purity.
B.2.3 Mixture of sulphate wood pulp and
cotton
B.3.1 100 % sulphate wood pulp Precompressed pressboard, a hard and rigid 1
board, characterized by high chemical purity
B.3.3 Mixture of sulphate wood pulp and
and mechanical strength. Its surface bears a
cotton
cloth mark.
B.4.1 100 % sulphate wood pulp Pressboard characterized by high chemical 2
purity and high oil absorption and capable of
B.4.3 Mixture of sulphate wood pulp and
being shaped.
cotton
B.5.1 100 % sulphate wood pulp Mouldable pressboard of high chemical 2
purity and high oil absorption.
B.5.3 Mixture of sulphate wood pulp and
cotton
B.6.1 100 % sulphate wood pulp Pressboard of low porosity for dry type 2
application.
NOTE 1 Qualities with specially high densities are designed in column B of B.0.1 (Table 1), B.2.1 (Table 1) and
B.6.1 (Table 2).
NOTE 2 Precompressed board with high rigidity is designed in column A of B.3.1 (Table 1); precompressed board
with moderate rigidity and higher flexibility in column B of B.3.1 (Table 1).

4 Requirements
The material sha
...