IEC 60641-1:2007

IEC 60641-1
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 1: Definitions and general requirements

Carton comprimé et papier comprimé à usages électriques –
Partie 1: Définitions et exigences générales

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IEC 60641-1
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Pressboard and presspaper for electrical purposes –
Part 1: Definitions and general requirements

Carton comprimé et papier comprimé à usages électriques –
Partie 1: Définitions et exigences générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
J
CODE PRIX
ICS 29.035.10 ISBN 2-8318-9589-8
– 2 – 60641-1 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope.5
2 Terms and definitions .5
3 Classification.5
4 General requirements .6
4.1 Composition .6
4.2 Finish .6
4.3 Machineability .6
5 Dimensions .6
6 Conditions of supply .6

Bibliography.9

Table 1 – Classification.8

60641-1 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 1: Definitions and general requirements

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
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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.
International Standard IEC 60641-1 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 1979 and amendment 1
(1993). This edition constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
– the kind of surface finish shall no longer be specified in the standard;
– fixed nominal thicknesses have been replaced by preferred thicknesses;
– types B.6 and P.6 have been replaced, but the designations have been kept;
– types B.7 and P.7 have been deleted.

– 4 – 60641-1 © 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
15/352/CDV 15/388/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.
60641-1 © IEC:2007 – 5 –
PRESSBOARD AND PRESSPAPER
FOR ELECTRICAL PURPOSES –
Part 1: Definitions and general requirements

1 Scope
This part of IEC 60641 contains definitions related to a classification of, and the general
requirements to be fulfilled by, pressboard and presspaper for electrical purposes.
2 Terms and definitions
2.1
pressboard
board normally made on an intermittent board machine from pulp made entirely from
vegetable origin of high chemical purity. It is characterized by its relatively high density, even
thickness, surface smoothness, high mechanical strength, flexibility, ageing resistance and
electrical insulating properties. The surface may be smooth or textured
2.2
presspaper
multilayer paper made by a continuous process from pulp entirely from vegetable origin and of
high chemical purity. It is characterized by its density, even thickness, surface smoothness,
high mechanical strength, ageing resistance and electrical insulating properties
2.3
calendered
pressboard or presspaper, which is subsequently treated with a calender
2.4
pre-compressed
pressboard to which heat has been applied during pressing
2.5
glazed
pressboard or presspaper to which lustre has been imparted. The lustre may be imparted by
any appropriate drying or mechanical finishing process
Based on ISO vocabulary of paper terms.
3 Classification
Based on compositions and properties, this standard covers the types of pressboard or
presspaper shown in Table 1. To the description of the types, some examples of known
applications are added without implying any kind of restriction on other possible applications.

– 6 – 60641-1 © IEC:2007
4 General requirements
4.1 Composition
All types of pressboard and presspaper covered by this standard shall be made entirely from
vegetable fibres. All types shall be free from extraneous material and adhesive and shall,
where necessary, contain a suitable dyestuff.
NOTE The absence of contaminants such as metallic, inorganic and organic particles indicates the
immaculateness of the material.
Many of the types listed in Table 1 are specified as made from "sulphate wood pulp". This raw
material is used in order to enable appropriate chemical purity and mechanical properties to
be achieved (excluding, for example, mechanical pulps).
Advances in pulp technology have enabled the requisite properties to be obtained by more
environmentally satisfactory processes, which cannot be described as "the sulphate process".
The term "sulphate wood pulp" in Table 1 is intended to include such materials.
In order to give satisfactory performance, it is necessary for the pulp to have a high degree
...