SIST EN 60371-1:2004

Specification for insulating materials based on mica -- Part 1: Definitions and general requirements

Gives definitions of terms used to describe built-up mica materials, products based on them and mica paper. It also deals with general requirements and conditions of supply. Changes in this new edition include: - a new Clause 2: Normative references; - under Clause 4: Description of material - new Subclause 4.2.1 to cover flexible mica material impregnated with B stage resin, - new Subclause 4.2.2 to cover flexible mica material, porous for post-impregnation; - a new Clause 5 covering general requirements and conditions of supply.

Bestimmung für Isoliermaterialien aus Glimmer -- Teil 1: Begriffe und allgemeine Anforderungen

Spécification pour les matériaux isolants à base de mica -- Partie 1: Définitions et exigences générales

Donne la définition des termes servant à la description des matériaux à base de mica, des produits qui en sont issus et du papier mica. Elle traite également des prescriptions générales et des conditions de fourniture. Les changements dans cette nouvelle édition incluent: - un nouvel Article 2: Références normatives; - dans l'Article 4: Description du matériau - un nouveau Paragraphe 4.2.1: Produits souples à base de mica imprégnés de résine à l'état B, - un nouveau Paragraphe 4.2.2: Produits souples à base de mica, poreux pour post-imprégnation; - un nouvel Article 5: Exigences générales et conditions de fourniture.

Specifikacije za izolacijske materiale iz sljude - 1. del: Definicije in splošne zahteve (IEC 60371-1:2003)

General Information

• Status: Published
• Publication Date: 31-Aug-2004
• ICS: 29.035.50 - Mica based materials
• Technical Committee: IZO - Insulating materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2004
• Due Date: 01-Sep-2004
• Completion Date: 01-Sep-2004
• Ref Project: EN 60371-1:2003 - Specification for insulating materials based on mica - Part 1: Definitions and general requirements

Relations

• Replaces: SIST EN 60371-1:1998 - Specification for insulating materials based on mica -- Part 1: Definitions and general requirements
• Effective Date: 06-May-2014

Overview

SIST EN 60371-1:2004 is a European Standard prepared by CLC that specifies the definitions and general requirements for insulating materials based on mica. This standard forms Part 1 of a series dedicated to mica insulating materials, widely used in electrical equipment due to mica's excellent thermal stability, electrical insulation, and mechanical strength. The standard covers built-up mica materials, mica paper, and products derived from these base materials.

The latest edition introduces updates to normative references and expands the description of flexible mica materials, including those impregnated with B stage resin and porous types intended for post-impregnation. It also details general requirements and conditions related to product supply.

Key Topics

• Definitions and Terminology
  This standard provides clear definitions for terms related to mica insulating materials, facilitating uniform understanding across manufacturers and users. Key terms include:

  • Mica - a mineral sheet silicate principally of muscovite or phlogopite types suitable for electrical insulation.
  • Mica splittings - thin laminae derived from mica blocks.
  • Mica paper - paper-like material made purely of small mica flakes without binders.
  • Built-up mica - layered mica splittings or mica paper bonded with binders, optionally reinforced.

• Material Descriptions
  EN 60371-1 differentiates between:

  • Rigid mica materials - flat, bonded mica products typically used for commutator separators (ground surfaces), heating equipment, or heat-formable applications.
  • Flexible mica materials - composed mainly of mica paper and binders, flexible enough for winding, wrapping, or molding with or without heat. Subcategories include:
    • Flexible mica impregnated with B stage resin for final curing after application.
    • Porous flexible mica designed for post-impregnation processes like vacuum pressure impregnation (VPI).
    • Flexible mica for fire-resistant cables.

• General Requirements and Conditions of Supply
  The standard establishes quality benchmarks and supply conditions to ensure consistency and reliability of mica-based products.

• Normative References
  EN 60371-1 integrates referenced international standards such as IEC 60050-212 (International Electrotechnical Vocabulary on insulating materials) and Part 3 of IEC 60371 series, which covers specifications for individual mica materials.

Applications

Mica-based insulating materials addressed in EN 60371-1 are essential for a wide range of electrical and electronic applications, including:

• Electric motors and generators - mica materials are used for insulation in stators, rotors, and commutators to withstand high temperatures and electrical stress.
• Heating equipment - rigid mica insulating sheets are employed for thermal protection and electrical insulation in devices such as electric heaters and cooking appliances.
• Fire-resistant cables - flexible mica materials provide critical insulation that maintains circuit integrity during fire exposure, improving safety standards in building wiring and industrial installations.
• Transformers and electrical apparatus - mica paper and built-up mica products offer reliable electrical insulation, mechanical strength, and durability.

These materials contribute to enhanced operational safety, longevity, and performance where heat resistance and electrical insulation are mandatory.

Related Standards

SIST EN 60371-1:2004 is part of a comprehensive series for mica-based insulating materials, including:

• EN 60371-3 - Specifications for individual mica materials, detailing testing and technical requirements for specific types of mica insulation.
• IEC 60050-212 - International Electrotechnical Vocabulary, providing standardized definitions covering insulating solids, liquids, and gases.
• Additional parts of IEC 60371 series - covering testing methods and other technical details related to mica insulating materials.

Compliance with EN 60371-1 ensures alignment with international and European practices, facilitating trade, manufacturing consistency, and product interoperability.

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By adhering to SIST EN 60371-1:2004, manufacturers and users of mica-based insulating materials benefit from standardized definitions, clear material classifications, and robust quality requirements that enhance performance and safety in electrical applications worldwide.

Standards Content (Sample)

SLOVENSKI SIST EN 60371-1:2004

STANDARD
september 2004
Specifikacije za izolacijske materiale iz sljude - 1. del: Definicije in splošne
zahteve (IEC 60371-1:2003)
Specification for insulating materials based on mica - Part 1: Definitions and general
requirements (IEC 60371-1:2003)
ICS 29.035.50 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60371-1
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2003
ICS 29.035.50 Supersedes EN 60371-1:1995

English version
Specification for insulating materials based on mica
Part 1: Definitions and general requirements
(IEC 60371-1:2003)
Spécification pour les matériaux isolants Bestimmung für Isoliermaterialien
à base de mica aus Glimmer
Partie 1: Définitions et exigences Teil 1: Begriffe und allgemeine
générales Anforderungen
(CEI 60371-1:2003) (IEC 60371-1:2003)

This European Standard was approved by CENELEC on 2003-06-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard 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 European Standard 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and 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

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60371-1:2003 E
Foreword
The text of document 15C/1452/FDIS, future edition 3 of IEC 60371-1, prepared by SC 15C,
Specifications, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60371-1 on 2003-06-01.

This European Standard supersedes EN 60371-1:1995.

Changes include
• a new Clause 2: Normative references;
• under Clause 4: Description of material
– new Subclause 4.2.1 to cover flexible mica material impregnated with B stage resin,
– new Subclause 4.2.2 to cover flexible mica material, porous for post-impregnation;
• a new Clause 5 covering general requirements and conditons of supply.

The following dates were fixed:

– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-03-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-06-01

Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60371-1:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60371-1:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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 60050-212 1990 International Electrotechnical - -
Vocabulary (IEV)
Chapter 212: Insulating solids, liquids
and gases
IEC 60371-3 Series Specification for insulating materials EN 60371-3 Series
based on mica
Part 3: Specifications for individual
materials
NORME CEI
INTERNATIONALE IEC
60371-1
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2003-04
Spécification pour les matériaux isolants
à base de mica –
Partie 1:
Définitions et exigences générales
Specification for insulating materials
based on mica –
Part 1:
Definitions and general requirements
 IEC 2003 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 any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
CODE PRIX
F
Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60371-1  IEC:2003 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATION FOR INSULATING MATERIALS
BASED ON MICA –
Part 1: Definitions and general requirements
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 co-operation on all questions co
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