EN 60371-3-6:1995/A1:2006

Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder

Bestimmung für Glimmererzeugnisse für elektrotechnische Zwecke - Teil 3: Bestimmungen für einzelne Materialien - Blatt 6: Glasgewebeverstärktes Glimmerpapier mit Epoxidharz-Bindemittel im B-Zustand

Spécification pour les matériaux isolants à base de mica - Partie 3: Spécifications pour matériaux particuliers - Feuille 6: Papier de mica renforcé de verre avec un agglomérant en résine époxyde à l'état B

Specifikacija za izolacijske materiale na temelju sljude – 3. del: Specifikacije za posamezne materiale – 6. list: Sljudni papir na steklu z vezivom iz epoksidne smole B (IEC 60371-3-6:1992/A1:2006)

General Information

• Status: Published
• Publication Date: 16-Nov-2006
• Withdrawal Date: 30-Sep-2009
• ICS: 29.035.50 - Mica based materials
• ICS: 29.040.20 - Insulating gases
• Technical Committee: CLC/SR 15 - Insulating materials
• Drafting Committee: IEC/TC 15 - IEC_TC_15
• Parallel Committee: IEC/TC 15 - IEC_TC_15
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 17-Nov-2006
• Completion Date: 17-Nov-2006
• Ref Project: SIST EN 60371-3-6:1998/A1:2007 - Specification for insulating materials based on mica -- Part 3: Specifications for individual materials -- Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder

Relations

• Amends: EN 60371-3-6:1995 - Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder
• Effective Date: 29-Jan-2023

Overview

EN 60371-3-6:1995/A1:2006 is a European standard defining specifications for insulating materials based on mica, with a focus on glass-backed mica paper bonded with a B-stage epoxy resin binder. Issued by CLC and aligned with IEC 60371-3-6:1992/A1:2006, this standard forms part of a comprehensive series covering mica-based electrical insulating materials. It establishes detailed requirements for the composition, mechanical, electrical, thermal, and physical properties, ensuring uniformity and reliability in industrial applications.

This standard primarily targets manufacturers and users of mica-based insulation materials, helping them conform to strict performance criteria essential for electrical equipment insulation.

Key Topics

• Material Composition
  Defines the chemical and physical makeup of calcinated and uncalcinated muscovite and phlogopite mica papers, reinforced with glass backing, meeting specific quality grades. Reference tables outline acceptable compositional limits.

• Mechanical Properties
  Specifies essential mechanical characteristics including:

  • Tensile strength in warp and weft directions
  • Flexural strength with minimum thresholds at room and elevated temperatures
  • Stiffness testing procedures as agreed in supply contracts
  • Thickness measurements per IEC 60371-2 guidelines

• Electrical Properties
  Covers electric strength testing methods, mandating a minimum dielectric strength of 30 kV/mm, as well as dissipation factor limits over typical operating frequencies to ensure optimal insulation performance.

• Thermal Performance
  Details thermal endurance criteria based on a flexural strength reduction benchmark, confirming the material’s durability under defined thermal stress conditions.

• Testing Methods
  Aligns all verification and evaluation techniques with corresponding IEC standards:

  • IEC 60243-1 for electric strength tests
  • IEC 60371-2 for methods of test on mica-based materials
  • IEC 60371-3-2 for specifications related to mica paper components

• Designation System
  Provides a clear, systematic nomenclature for ordering products according to sheet, table, and product numbers, enhancing traceability and communication in the supply chain.

• Safety Considerations
  Emphasizes user responsibility to apply test methods safely and to select materials based on specific application performance needs rather than specification alone.

Applications

Glass-backed mica paper with a B-stage epoxy resin binder is widely used in electrical and electronic equipment insulation where high reliability and resistance to heat, mechanical stress, and electrical breakdown are critical.

Typical applications include:

• Insulation layers in transformers and reactors
• Electric motor armatures and stators
• High-performance capacitors and coils
• Electrical insulating barriers and sheets in power generation and distribution equipment

This material provides excellent dielectric strength, thermal endurance, and mechanical robustness, making it indispensable for ensuring long-term operational safety and efficiency in industrial electrical components.

Related Standards

EN 60371-3-6:1995/A1:2006 complements other key standards in the mica insulation family, including:

• IEC 60371-1: Definitions and general requirements for mica-based insulating materials
• IEC 60371-2: Test methods for evaluating mica insulation materials
• IEC 60371-3-2: Specifications for mica paper as a base material
• IEC 60243-1: Established test methods for electric strength of insulating materials

Compliance with these interrelated standards ensures comprehensive quality assurance and performance verification for mica-based insulation products throughout electrical equipment manufacturing.

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Keywords: EN 60371-3-6, mica insulating materials, glass-backed mica paper, B-stage epoxy resin, electrical insulation, dielectric strength, mica paper specifications, IEC mica standards, thermal endurance, electric strength test, insulation material standards

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2007
Specifikacija za izolacijske materiale na temelju sljude – 3. del: Specifikacije za
posamezne materiale – 6. list: Sljudni papir na steklu z vezivom iz epoksidne
smole B (IEC 60371-3-6:1992/A1:2006)
Specification for insulating materials based on mica -- Part 3: Specifications for individual
materials -- Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder (IEC
60371-3-6:1992/A1:2006)
Bestimmung für Glimmererzeugnisse für elektrotechnische Zwecke -- Teil 3:
Bestimmungen für einzelne Materialien -- Blatt 6: Glasgewebeverstärktes Glimmerpapier
mit Epoxidharz-Bindemittel im B-Zustand (IEC 60371-3-6:1992/A1:2006)
Spécification pour les matériaux isolants a base de mica -- Partie 3: Spécifications pour
matériaux particuliers -- Feuille 6: Papier de mica renforcé de verre avec un agglomérant
en résine époxyde a l'état B (IEC 60371-3-6:1992/A1:2006)
Ta slovenski standard je istoveten z: EN 60371-3-6:1995/A1:2006
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.

EUROPEAN STANDARD
EN 60371-3-6/A1
NORME EUROPÉENNE
November 2006
EUROPÄISCHE NORM
ICS 29.035.50
English version
Specification for insulating materials based on mica
Part 3: Specifications for individual materials -
Sheet 6: Glass-backed mica paper
with a B-stage epoxy resin binder
(IEC 60371-3-6:1992/A1:2006)
Spécification pour les matériaux isolants  Bestimmung für Glimmererzeugnisse
à base de mica für elektrotechnische Zwecke
Partie 3: Spécifications Teil 3: Bestimmungen
pour matériaux particuliers - für einzelne Materialien -
Feuille 6: Papier de mica renforcé de Blatt 6: Glasgewebeverstärktes
verre avec un agglomérant en résine Glimmerpapier mit Epoxidharz-Bindemittel
époxyde à l'état B im B-Zustand
(CEI 60371-3-6:1992/A1:2006) (IEC 60371-3-6:1992/A1:2006)

This amendment A1 modifies the European Standard EN 60371-3-6:1995; it was approved by CENELEC on
2006-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60371-3-6:1995/A1:2006 E

Foreword
The text of document 15/333/FDIS, future amendment 1 to IEC 60371-3-6:1992, prepared by IEC TC 15,
Standards on specifications for electrical insulating materials, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as amendment A1 to EN 60371-3-6:1995 on 2006-10-01.
The following dates were fixed:
– latest date by which the amendment has to be
implemented at national level by publication of
an identical national standard or by endorsement (dop) 2007-07-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2009-10-01
__________
Endorsement notice
The text of amendment 1:2006 to the International Standard IEC 60371-3-6:1992 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________
- 3 - EN 60371-3-6:1995/A1:2006
Replace Annex ZA of EN 60371-3-6:1995 by:
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60243-1 1998 Electrical strength of insulating EN 60243-1 1998
materials - Test methods
Part 1: Tests at power frequencies

IEC 60371-2 2004 Specification for insulating materials EN 60371-2 2004
based on mica
Part 2: Methods of test
IEC 60371-3-2 2005 Insulating materials based on mica EN 60371-3-2 2006
Part 3: Specifications for individual + corr. November 2006
materials - Sheet 2: Mica paper

INTERNATIONAL IEC
STANDARD 60371-3-6
AMENDMENT 1
2006-09
Amendment 1
Specification for insulating materials
based on mica –
Part 3:
Specifications for individual materials –
Sheet 6: Glass-backed mica paper with
a B-stage epoxy resin binder
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
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– 2 – 60371-3-6 Amend. 1  IEC:2006(E)
FOREWORD
This amendment has been prepared by IEC technical committee 15: Standards on
specifications for electrical insulating materials.
The text of this amendment is based on the follo
...