IEC 60763-1:2010

IEC 60763-1 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Laminated pressboard for electrical purposes –
Part 1: Definitions, classification and general requirements

Cartons comprimés et contrecollés à usages électriques –
Partie 1: Définitions, classification et exigences générales

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IEC 60763-1 ®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Laminated pressboard for electrical purposes –
Part 1: Definitions, classification and general requirements

Cartons comprimés et contrecollés à usages électriques –
Partie 1: Définitions, classification et exigences générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
F
CODE PRIX
ICS 29.035.10 ISBN 978-2-88912-145-8
– 2 – 60763-1 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LAMINATED PRESSBOARD FOR ELECTRICAL PURPOSES –

Part 1: Definitions, classification 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
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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International Standard IEC 60763-1 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 1983. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are as follows:
– the specification was brought in line with the second edition of IEC 60641-1(2007).
The text of this standard is based on the following documents:
CDV Report on voting
15/536/CDV 15/566/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.

60763-1 © IEC:2010 – 3 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
A list of all the parts in the IEC 60763 series can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.
– 4 – 60763-1 © IEC:2010
LAMINATED PRESSBOARD FOR ELECTRICAL PURPOSES –

Part 1: Definitions, classification and general requirements

1 Scope
This part of IEC 60763 contains the definitions required for the understanding of all three
parts of IEC 60763, the classification of material into types, and the general requirements
applicable to all material covered by the standard.
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.
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 60641-1:2007, Pressboard and presspaper for electrical purposes – Part 1: Definitions
and general requirements
3 Terms and definitions
For the purposes of this document the following definitions apply:
3.1
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
3.2
laminated pressboard
board built up from sheets of pressboard bonded with an adhesive
4 Classification
Based on compositions and properties, this standard covers the types of laminated
pressboard shown in Table 1. The designation of types is the same as that given in
IEC 60641-1; in addition, “L” is shown for “laminated” (for example LB0.1). To the description
of the types some examples of known applications are added without implying any restriction
on other possible applications.

60763-1 © IEC:2010 – 5 –
Table 1 – Classification
Type Subdivisions Example of
application
LB0 Pressboard of particularly high LB0.1 100 % sulphate wood pulp Electrical equipment
chemical purity LB0.2 100 % cotton where particularly
LB0.3 Mixture of sulphate wood pulp high chemical purity
and cotton is required
LB2 Pressboard characterized by high LB2.1 100 % sulphate wood pulp Transformers
chemical purity LB2.2 100 % cotton
LB2.3 Mixture of sulphate wood pulp
and cotton
LB2.4 Mixture of cotton and jute hemp
LB3 Pre-compressed pressboard, a very LB3.1 100 % sulphate wood pulp Transformers
hard and rigid board characterized LB3.2 100 % cotton
by high chemical purity and LB3.3 Mixture of sulphate wood pulp
mechanical strength. Its surface and cotton
bears a cloth mark LB3.4 Mixture of cotton and jute hemp
LB4 Pressboard characterized by high LB4.1 100 % sulphate wood pulp Transformers and
chemical purity and high oil LB4.2 100 % cotton oil-immersed
absorption and capable of being LB4.3 Mixture of sulphate wood pulp equipment
shaped and cotton
LB4.4 Mixture
...