IEC 60667-3-1:2020
(Main)Vulcanized fibre for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Flat sheets
Vulcanized fibre for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Flat sheets
IEC 60667-3-1: 2020 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. 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:
change to the range of thickness deviation in Table 1;
addition of apparent density in Table 1;
change to the range of thickness for tensile strength in Table 1;
addition of flexibility and shrinkage in Table 1;
change test method and property value of internal ply adhesion on Table 1.
Fibres vulcanisées à usages électriques - Partie 3: Spécifications pour matériaux individuels - Feuille 1: Feuilles planes
IEC 60667-3-1:2020 donne les exigences pour les feuilles en fibre vulcanisée à usages électriques. Les matériaux composites constitués de plusieurs couches de fibre vulcanisée assemblées par un adhésif ne sont pas couverts par le présent document. Les matériaux conformes à la présente spécification satisfont aux niveaux de performance établis. Cependant, le choix du matériau par un utilisateur pour une application spécifique est fondé sur les exigences réellement nécessaires pour une performance appropriée et non sur cette seule spécification. Mise en garde: il est de la responsabilité de l'utilisateur des méthodes contenues ou mentionnées dans le présent document de veiller à ce qu'elles soient utilisées de façon sécurisée. Cette deuxième édition annule et remplace la première édition parue en 1986. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
modification de la plage d'écarts par rapport à l'épaisseur dans le Tableau 1;
ajout de masse volumique apparente dans le Tableau 1;
modification de la plage d'épaisseur pour la résistance à la traction dans le Tableau 1;
ajout de flexibilité et stabilité dimensionnelle dans le Tableau 1;
modification de la méthode d'essai et de la valeur de propriété de l'adhérence interne du feuilletage dans le Tableau 1.
General Information
- Status
- Published
- Publication Date
- 24-Mar-2020
- Technical Committee
- TC 15 - Solid electrical insulating materials
- Drafting Committee
- MT 16 - TC 15/MT 16
- Current Stage
- PPUB - Publication issued
- Start Date
- 25-Mar-2020
- Completion Date
- 10-Apr-2020
Overview
IEC 60667-3-1:2020 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the requirements for vulcanized fibre flat sheets used for electrical purposes. This standard is part of the broader IEC 60667 series, which addresses vulcanized fibre for various electrical applications. The standard is applicable to sheets of vulcanized fibre and does not cover materials formed by bonding multiple layers with adhesives. It defines established performance levels for these materials, but the final selection should always consider specific application requirements.
This second edition, published in 2020, supersedes the previous 1986 edition and introduces technical changes such as revised thickness deviations, inclusion of apparent density, updated tensile strength ranges, flexibility and shrinkage parameters, and modified testing methods for internal ply adhesion.
Key Topics
- Scope and Applicability: Focuses on flat sheets of vulcanized fibre for electrical applications, excluding composite sheets formed with adhesives.
- Classification: The material is categorized as either general type or fishpaper type, as referenced in IEC 60667-1.
- Requirements: Sheets must meet general quality and finish criteria, as well as established mechanical and electrical properties when tested per IEC 60667-2.
- Performance Characteristics: The specification outlines base performance attributes, but application-specific factors should guide material selection.
- Revised Technical Criteria:
- Adjusted range for thickness deviations.
- Addition of apparent density requirements.
- Updates to tensile strength categories based on thickness.
- Introduction of flexibility and shrinkage measurements.
- Revised methods and values for internal ply adhesion testing.
Safety Warning: Users are responsible for applying the test methods from this standard in a safe manner and ensuring compliance with local safety regulations.
Applications
Vulcanized fibre sheets compliant with IEC 60667-3-1:2020 play a pivotal role in electrical and electronic industries, where reliable insulating materials are essential for safety and performance.
Typical applications include:
- Electrical insulation: Used as slot liners, phase barriers, and separators in motors, generators, and transformers.
- Control panels and switchgear: Employed as mounting panels and supports due to their insulating properties.
- Component fabrication: Cut and shaped for washers, gaskets, and other insulating parts in electrical assemblies.
- Consumer and industrial equipment: Utilized in devices requiring durable, thin insulation with consistent dielectric and mechanical properties.
When selecting vulcanized fibre sheets for an application, it is important to consider environmental exposure, mechanical demands, and specific electrical requirements to ensure compliance beyond just the standard’s baseline.
Related Standards
IEC 60667-3-1:2020 is part of a series dedicated to vulcanized fibre for electrical purposes. For comprehensive compliance and optimal material selection, users should be familiar with the following related IEC standards:
- IEC 60667-1: Vulcanized fibre for electrical purposes - Definitions and general requirements.
- IEC 60667-2: Vulcanized fibre for electrical purposes - Methods of test.
- Other Parts of IEC 60667: Specifications for additional forms, grades, and uses of vulcanized fibre.
These related documents clarify terms, testing procedures, and broader requirements essential for full alignment with international best practices in electrical insulation.
By adhering to IEC 60667-3-1:2020, manufacturers, engineers, and users assure material quality and performance for vulcanized fibre flat sheets in electrical applications, supporting safety, reliability, and global standardization in the electrotechnical field.
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Frequently Asked Questions
IEC 60667-3-1:2020 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Vulcanized fibre for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Flat sheets". This standard covers: IEC 60667-3-1: 2020 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. 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: change to the range of thickness deviation in Table 1; addition of apparent density in Table 1; change to the range of thickness for tensile strength in Table 1; addition of flexibility and shrinkage in Table 1; change test method and property value of internal ply adhesion on Table 1.
IEC 60667-3-1: 2020 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. 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: change to the range of thickness deviation in Table 1; addition of apparent density in Table 1; change to the range of thickness for tensile strength in Table 1; addition of flexibility and shrinkage in Table 1; change test method and property value of internal ply adhesion on Table 1.
IEC 60667-3-1:2020 is classified under the following ICS (International Classification for Standards) categories: 29.035.10 - Paper and board insulating materials. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60667-3-1:2020 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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
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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 ter
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