EN 60371-3-7:1995

Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 7: Polyester film mica paper with an epoxy resin binder for single conductor taping

This specification covers material having a nominal thickness from 0,07 mm to 0,12 mm and supplied in roll form.

Glimmererzeugnisse für elektrotechnische Zwecke - Teil 3: Bestimmungen für einzelne Materialien - Blatt 7: Polyesterfolienverstärktes Glimmerpapier mit einem Epoxidharz-Bindemittel zur Einzelleiterbandelung

Matériaux isolants à base de mica - Partie 3: Spécifications pour matériaux particuliers - Feuille 7: Ruban à base de papier de mica, film polyester et liant époxyde pour l'isolation de conducteurs élémentaires

Cette spécification recouvre les produits ayant une épaisseur nominale de 0,07 mm à 0,12 mm et livrés en rouleaux.

Specifikacija za izolacijske materiale na temelju sljude – 3. del: Specifikacije za posamezne materiale – 7. list: Sljudni papir na poliestrski foliji z vezivom iz epoksidne smole za povijanje posameznih vodnikov (IEC 60371-3-7:1995)

General Information

• Status: Published
• Publication Date: 27-Sep-1995
• Withdrawal Date: 31-Jul-1996
• ICS: 29.040.20 - Insulating gases
• Technical Committee: CLC/SR 15 - Insulating materials
• Drafting Committee: IEC/TC 15 - IEC_TC_15
• Parallel Committee: IEC/SC 15C - IEC_SC_15C
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 28-Sep-1995
• Completion Date: 28-Sep-1995
• Ref Project: SIST EN 60371-3-7:1998 - Specification for insulating materials based on mica -- Part 3: Specifications for individual materials -- Sheet 7: Polyester film mica paper with an epoxy resin binder for single conductor taping

Relations

• Amended By: EN 60371-3-7:1995/A1:2006 - Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 7: Polyester film mica paper with an epoxy resin binder for single conductor taping
• Effective Date: 28-Jan-2023

Overview

EN 60371-3-7:1995 is an international standard developed by the International Electrotechnical Commission (IEC) and adopted by the CLC. This specification focuses on insulating materials based on mica, specifically detailing the properties and requirements for polyester film mica paper with an epoxy resin binder designed for single conductor taping. The material is manufactured and supplied in flexible roll form, with nominal thickness ranging from 0.07 mm to 0.12 mm.

The purpose of this standard is to ensure uniformity, reliability, and performance of mica-based polyester film tapes used in electrical insulation of single conductors. By adhering to this standard, manufacturers and industries can achieve consistent quality that meets international expectations for electrical insulating materials.

Key Topics

• Material Composition: The standard includes mica paper reinforced with polyester (PET) film and an epoxy resin binder. This combination provides excellent electrical insulating properties, mechanical strength, and thermal stability.

• Specifications and Tolerances:

  • Thickness: Nominal thickness between 0.07 mm to 0.12 mm.
  • Width: Preferred widths include 6, 8, 10, 12, 15, and 20 mm with specified tolerances.
  • Mass per area: Defined mica content, polyester film grammage, and resin content with acceptable tolerances to maintain material consistency.

• Mechanical and Electrical Requirements:

  • Electric strength: Minimum breakdown voltage of 50 kV/mm ensuring high dielectric resistance.
  • Tensile strength: Minimum tensile requirements depending on polyester film thickness (e.g., 25 N/10 mm for 23 gm PET film).
  • Stiffness: To be agreed upon in purchase contracts, tested per IEC methods.
  • The tape must have smooth, defect-free surfaces and be capable of continuous unrolling without damage.

• Manufacturing and Testing Standards:

  • Mica paper compliant with IEC 371-3.
  • Polyester films meeting IEC 674-3-2 specifications.
  • Testing methods as per IEC 371-2 and IEC 243-1 to verify mechanical and electrical properties.

• Packaging and Delivery:

  • Tape rolls wound on cores with no sharp edges (55 mm or 76 mm inner diameter).
  • Clear marking of material description, width, length, batch number, manufacturing date, and storage instructions.
  • Limitations on the number and length of joins in roll consignments to ensure quality.

Applications

EN 60371-3-7 polyester film mica paper with epoxy resin binder is primarily used for electrical insulation in single conductor taping. This makes it ideal for industries and products requiring:

• High-voltage electrical equipment insulation.
• Motors, generators, transformers, and coils where mica-based tapes ensure thermal and electrical stability.
• Insulation in harsh operational environments where resistance to heat, electrical stress, and mechanical wear is critical.
• Applications requiring a flexible, durable insulating tape that can be processed easily for winding around conductors.

By complying with this specification, manufacturers ensure materials deliver reliable dielectric strength and mechanical integrity, contributing to the longevity and safety of electrical devices and installations.

Related Standards

EN 60371-3-7:1995 is part of a wider series of standards on mica-based insulating materials, including:

• EN 60371-1: Definitions and general requirements: Sets foundational principles for mica-based insulation materials.
• EN 60371-2: Methods of test: Specifies test procedures for evaluating mechanical, electrical, and thermal properties.
• EN 60371-3-2: Mica paper: Focuses on mica paper materials specifically.
• IEC 674-3-2: Plastic films for electrical purposes: Defines requirements for polyester films like PET used in electrical insulation.

Together, these standards form a comprehensive framework for quality and performance assurance across mica-based varnished and composite insulating materials.

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Keywords: insulating materials mica, polyester film mica paper, epoxy resin binder, single conductor taping, electrical insulation tape, mica paper insulation standard, IEC 60371-3-7, high voltage electrical insulation, mica electrical tape specification, polyester mica paper thickness.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-1998
Specifikacija za izolacijske materiale na temelju sljude – 3. del: Specifikacije za
posamezne materiale – 7. list: Sljudni papir na poliestrski foliji z vezivom iz
epoksidne smole za povijanje posameznih vodnikov (IEC 60371-3-7:1995)
Specification for insulating materials based on mica -- Part 3: Specifications for individual
materials -- Sheet 7: Polyester film mica paper with an epoxy resin binder for single
conductor taping
Glimmererzeugnisse für elektrotechnische Zwecke -- Teil 3: Bestimmungen für einzelne
Materialien -- Blatt 7: Polyesterfolienverstärktes Glimmerpapier mit einem Epoxidharz-
Bindemittel zur Einzelleiterbandelung
Matériaux isolants à base de mica -- Partie 3: Spécifications pour matériaux particuliers -
- Feuille 7: Ruban à base de papier de mica, film polyester et liant époxyde pour
l'isolation de conducteurs élémentaires
Ta slovenski standard je istoveten z: EN 60371-3-7:1995
ICS:
29.035.50 Materiali na podlagi sljude Mica based materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
60371-3-7
INTERNATIONAL
Première édition
STAN
DARD
First edition
1995-08
Matériaux isolants
à base de mica —
Troisième partie:
Spécifications pour matériaux particuliers —
Feuille 7: Ruban à base de papier de mica,
film polyester et liant époxyde pour
conducteurs élémentaires
Insulating materials based on mica —
Part 3:
Specifications for individual materials —
Sheet 7: Polyester film mica paper with an
epoxy resin binder for single conductor taping
© IEC 1995 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
G
PRICE CODE
International Electrotechnical Commission
IEC Me ayHapog Han 3neKTpoTexHwiecKaR 1iOMHCCHA
Pour prix, voir catalogue en vigueur
• • For price, see current catalogue

IEC Publication 371-3-7
Publication 371-3-7 de la CEI
(First edition - 1995)
(Première édition - 1995)
Matériaux isolants à base de mica - Insulating materials based on mica -
Part 3: Specifications for individual materials -
Partie 3: Spécifications pour matériaux particuliers -
Sheet 7: Polyester film mica paper with an
Feuille 7: Ruban à base de papier de mica,
epoxy resin binder for single
film polyester et liant époxyde pour
conducteurs élémentaires conductor taping
C O R R I G E N D U M 1*
Corrections in the French text only.
Sur la page 1 de couverture et sur la page
de titre, remplacer le titre existant de la
feuille
Feuille 7: Ruban à base de papier
liant
de mica, film polyester et
époxyde pour conducteurs
élémentaires
par le nouveau titre suivant:
Feuille 7: Ruban à base de papier
de mica, film polyester et liant
époxyde pour l’isolation de
conducteurs élémentaires
Page 2 et page 6
Remplacer 7,
le titre existant de la feuille
par le nouveau titre de feuille suivant:
Feuille 7: Ruban à base de papier
liant
de mica, film polyester et
époxyde pour l’isolation
élémentaires
de conducteurs
Page 4
Dans l’avant-dernière ligne de la page, au
lieu de:
... et liant époxyde pour conducteurs
élémentaires
lire:
...
et liant époxyde pour l’isolation de
conducteurs élémentaires.
* Selon la demande du Comité National Français, qui a
* At the request of the French National Committee,

décidé d’introduire ces corrections dans la future
which has decided to introduce these corrections

Norme Nationale Française, les modifications éditoria-
in the future French National Standard, the following
les suivantes sont nécessaires.
editorial changes should be made.

Correction in the French text only.
Page 8
3 Désignation
Dans la troisième colonne du tableau 1, en
tête, au lieu de:
Film
PET
lire:
Grammage
du film
PET
Correction dans le texte anglais unique- Page 9
ment.
4.1 Mica splittings
Replace the existing title of article 4.1 by the
new title as follows:
4.1 Mica paper
Page 10
Correction in the French text only.
A l’article 6, remplacer le titre existant
6 Prescriptions sur le matériau
reçu)
(tel que
par le nouveau titre suivant:
6 Prescriptions sur le matériau
( à l’état de réception)
Août 1995 August 1995
371-3-7 © IEC:1995 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INSULATING MATERIALS BASED ON MICA -
Part 3: Specifications for individual materials -
Sheet 7: Polyester film mica paper with an epoxy resin binder
for single conductor taping
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
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. The 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 the IEC on technical matters, prepared by technical committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
3) They have the form of recommendations for international use published in the form of standards, technical
reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter. The text of this standard is based on the following documents:
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
International Standard IEC 371-3-7 has been prepared by IEC by sub-committee 15C:
Specifications, of IEC technical committee 15: Insulating materials.
The text of this standard is based on the following documents:
Report on voting
DIS
15C/477/DIS 15C/531/RVD
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.

371-3-7 © IEC:1995 –5-
INTRODUCTION
This International Standard is one of a series which deals with insulating mater
...