IEC 60667-3-1:2020

IEC 60667-3-1 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Vulcanized fibre for electrical purposes –
Part 3: Specifications for individual materials – Sheet 1: Flat sheets

Fibres vulcanisées à usages électriques –
Partie 3: Spécifications pour matériaux individuels – Feuille 1: Feuilles planes

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IEC 60667-3-1 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Vulcanized fibre for electrical purposes –

Part 3: Specifications for individual materials – Sheet 1: Flat sheets

Fibres vulcanisées à usages électriques –

Partie 3: Spécifications pour matériaux individuels – Feuille 1: Feuilles planes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.10 ISBN 978-2-8322-8024-9

– 2 – IEC 60667-3-1:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Classification . 6
5 Requirements . 7

Table 1 – Requirements . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VULCANIZED FIBRE FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 1: Flat sheets
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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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 60667-3-1 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 1986. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) change to the range of thickness deviation in Table 1;
b) addition of apparent density in Table 1;
c) change to the range of thickness for tensile strength in Table 1;
d) addition of flexibility and shrinkage in Table 1;
e) change test method and property value of internal ply adhesion on Table 1.
The text of this International Standard is based on the following documents:

– 4 – IEC 60667-3-1:2020 © IEC 2020
CDV Report on voting
15/880/CDV 15/894/RVC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60667 series, published under the general title Vulcanized fibre for
electrical purposes, can be found on the IEC website.
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.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
This International Standard is one of a series which deals with vulcanized fibre sheets for
electrical purposes.
The series consists of three parts:
Part 1: Definitions and general requirements (IEC 60667-1)
Part 2: Methods of test (IEC 60667-2)
Part 3: Specifications for individual materials (IEC 60667-3)

– 6 – IEC 60667-3-1:2020 © IEC 2020
VULCANIZED FIBRE FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 1: Flat sheets
1 Scope
This part of IEC 60667 gives requirements for vulcanized fibre sheets for electrical purposes.
Materials made by combining with an adhesive several thicknesses of vulcanized fibre are not
covered by this document.
Materials that conform to this specification meet established levels of performance. However,
the selection of a material by a user for a specific application is 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 documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 60667-1, Vulcanized fibre for electrical purposes – Part 1: Definitions and general
requirements
, Specification for vulcanized fibre for electrical purposes – Part 2: Methods of
IEC 60667-2:—
Test
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Classification
The material shall be classified as general type or fishpaper type, as indicated in IEC 60667-1.

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