IEC 60641-3-2:2007

IEC 60641-3-2
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 3: Specifications for individual materials – Sheet 2: Requirements for
presspaper, types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1

Carton comprimé et papier comprimé à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 2: Exigences pour
papier comprimé, types P.2.1, P.4.1, P.4.2, P.4.3 et P.6.1

IEC 60000:2007
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IEC 60641-3-2
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 3: Specifications for individual materials – Sheet 2: Requirements for
presspaper, types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1

Carton comprimé et papier comprimé à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 2: Exigences pour
papier comprimé, types P.2.1, P.4.1, P.4.2, P.4.3 et P.6.1

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
G
CODE PRIX
ICS 29.035.10 ISBN 2-8318-9590-1
– 2 – 60641-3-2 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Designation (according to IEC 60641-1) .5
4 Requirements .5

Table 1 – Requirements for presspaper .6

60641-3-2 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 2: Requirements for presspaper,
types P.2.1, P.4.1, P.4.2, P.4.3 and P.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
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
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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 60641-3-2 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:
– type P.6 has been replaced with a new type, but the designation has been kept;
– type P.7 has been deleted;
– the thickness relation of the properties has been simplified;
– the values were adjusted to today's needs of users.

– 4 – 60641-3-2 © IEC:2007
This bilingual version, published in 2008-01, corresponds to the English version.
The text of this standard is based on the following documents:
CDV Report on voting
15/353/CDV 15/389/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.
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.
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.
60641-3-2 © IEC:2007 – 5 –
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 2: Requirements for presspaper,
types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1

1 Scope
This part of IEC 60641 gives the requirements for presspaper for electrical purposes
comprised of 100 % sulphate wood pulp, 100 % cotton or a mixture of sulphate wood pulp and
cotton.
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, 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
3 Designation (according to IEC 60641-1)
Type Composition Description Table
P.2.1 100 % sulphate wood pulp Presspaper of high density and high 1
chemical purity.
P.4.1 100 % sulphate wood pulp Presspaper of high chemical purity and 1
high oil absorption.
P.4.2 100 % cotton
P.4.3 Mixture of sulphate wood pulp and
cotton
P.6.1 100 % sulphate wood pulp Presspaper of low porosity for dry type 1
application.
NOTE Technical specifications where higher elongation is required are found under column B of P.2.1, P.4.1 and
P.6.1.
4 Requirements
The material shall conform to the general requirements as given in IEC 60641-1 and to the
specific requirements of the appropriate type given in Table 1 of this sheet.

– 6 – 60641-3-2 © IEC:2007
Table 1 – Requirements for presspaper
P.2 presspaper of high P.4 soft porous presspaper of high chemical P.6 presspaper of low
density and high purity and high oil absorption porosity for dry type
chemical purity application
Min. / Max.
IEC 60641-2
P.2.1 A P.2.1 B P.4.1 A P.4.1 B P.4.2 P.4.3 P.6.1 A P.6.1 B
Property Unit or
Clause or
100 % 100 % 100 % 100 % 100 % Mixture of 100 % 100 %
subclause
range
sulphate sulphate sulphate sulphate cotton sulphate sulphate sulphate
wood pulp wood pulp wood pulp wood pulp wood pulp wood pulp wood pulp
and
cotton
Thickness 5 % Max. ±10 ±10 ±10 ±10 ±10 ± 0 ±10 ±10
Deviation from nominal
Apparent density 6 Range 1,2 - 1,3 1,2 - 1,3 1,0 - 1,2 0,95 - 1,15 1,0 - 1,2 0,95 - 1,15 1,0 - 1,2 1,1 - 1,25
g/cm
Tensile strength unfolded 7 MPa Min.
Machine direction
≤0,2 m
...