SIST EN 60371-3-6:1998
(Main)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
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
Gives requirements for materials made by combining mica paper with glass fabric and impregnating the mica paper with an epoxy resin. The material is supplied in a flexible state for final cure after application in the form of sheets or rolls.
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
Donne les prescriptions concernant les matériaux obtenus en combinant du papier de mica avec du tissu de verre et en imprégnant le papier de mica avec une résine époxyde. Le matériau est fourni pour traitement de durcissement après application, sous forme de feuille ou de rouleaux.
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)
General Information
- Status
- Published
- Publication Date
- 31-May-1998
- Technical Committee
- IZO - Insulating materials
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jun-1998
- Due Date
- 01-Jun-1998
- Completion Date
- 01-Jun-1998
Relations
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 01-Nov-2007
Overview
SIST EN 60371-3-6:1998 specifies requirements for glass-backed mica paper impregnated with a B-stage epoxy resin binder, intended for use as flexible electrical insulating materials. Developed under the coordination of the Slovenski inštitut za standardizacijo (SIST) and fully aligned with EN 60371-3-6:1995 and IEC 60371-3-6:1992, this standard is part of a broader series addressing the performance and characteristics of mica-based insulating materials in electrical engineering applications.
These materials are manufactured by combining mica paper with glass fabric and then impregnating this assembly with an epoxy resin in the B-stage. Provided in flexible sheets or rolls, the product is intended for final curing during application, making it highly adaptable to various electrical insulation processes.
Key Topics
Material Composition:
- Mica paper (both muscovite and phlogopite variants) as per IEC 371-3-2
- Glass fabric reinforcement, typically in the loom state
- Epoxy resin binder at B-stage, ensuring flexibility for processing and subsequent curing
Physical Forms:
- Delivered as sheets or rolls in varying thickness (0.09 mm to 0.32 mm)
- Supplied flexible for easier handling, application, and installation
Quality Requirements:
- Consistent physical and electrical properties within each batch
- Uniformity in surface quality, thickness, width, and length
- Minimum and maximum permissible tolerances for glass, mica, and resin content
Performance Characteristics:
- High dielectric strength and thermal endurance
- Mechanical strength including tensile and flexural strength after cure
- Resistance to electric stress and retention of insulation properties at elevated temperatures
- Low dissipation factor at operational frequencies
Applications
Glass-backed mica paper with a B-stage epoxy resin binder is widely used in the electrical and electronics industry, particularly where high-performance insulation is essential. Key application domains include:
- Electromachinery windings: As main or layer insulation in high-voltage and high-temperature rotating machines (such as generators and motors)
- Power transformers and electrical equipment: Providing insulation between conductors and core components that must withstand electric and thermal stresses
- Busbars and switchgear: Ensuring reliable insulation in environments subject to substantial mechanical and electrical loads
- Custom insulation assemblies: Leveraged wherever conformability and subsequent in-situ curing are critical, due to the flexible yet form-stable nature of the B-stage material
The product’s delivery as flexible sheets or rolls allows for easy shaping, wrapping, or layering before the final curing process, improving manufacturing flexibility and reducing waste.
Related Standards
The following international standards are relevant to the specification and application of glass-backed mica paper insulation materials:
- IEC 60371-1 / EN 60371-1: Definitions and general requirements for mica-based insulating materials.
- IEC 60371-2 / EN 60371-2: Methods of test for mica-based insulating materials, covering procedures for measuring physical, mechanical, and electrical properties.
- IEC 243-1: Methods of test for electric strength of solid insulating materials at power frequencies.
- Other SIS/IEC/EN mica specification sheets: Covering alternative composite structures and binders for different insulation needs.
Adhering to SIST EN 60371-3-6:1998 ensures product compatibility, quality assurance, and safety in high-reliability electrical applications, supporting both manufacturers and end-users in compliance, procurement, and operational excellence.
Get Certified
Connect with accredited certification bodies for this standard
IMQ S.p.A. (Certification)
Italian electrical product certification.
SLG Prüf- und Zertifizierungs GmbH
German testing and certification body.
UL Solutions
Global safety science company with testing, inspection and certification.
Sponsored listings
Frequently Asked Questions
SIST EN 60371-3-6:1998 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "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". This standard covers: Gives requirements for materials made by combining mica paper with glass fabric and impregnating the mica paper with an epoxy resin. The material is supplied in a flexible state for final cure after application in the form of sheets or rolls.
Gives requirements for materials made by combining mica paper with glass fabric and impregnating the mica paper with an epoxy resin. The material is supplied in a flexible state for final cure after application in the form of sheets or rolls.
SIST EN 60371-3-6:1998 is classified under the following ICS (International Classification for Standards) categories: 29.035.50 - Mica based materials. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 60371-3-6:1998 has the following relationships with other standards: It is inter standard links to SIST EN 60371-2:1998, SIST EN 60371-3-2:1998, SIST EN IEC 60626-1:2024, SIST EN 60371-3-6:1998/A1:2007. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 60371-3-6:1998 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.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)Bestimmung für Glimmererzeugnisse für elektrotechnische Zwecke -- Teil 3: Bestimmungen für einzelne Materialien -- Blatt 6: Glasgewebeverstärktes Glimmerpapier mit Epoxidharz-Bindemittel im B-ZustandSpécification 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 BSpecification for insulating materials based on mica -- Part 3: Specifications for individual materials -- Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder29.035.50Materiali na podlagi sljudeMica based materialsICS:Ta slovenski standard je istoveten z:EN 60371-3-6:1995SIST EN 60371-3-6:1998en01-junij-1998SIST EN 60371-3-6:1998SLOVENSKI
STANDARD
CODE PRIXPRICE CODELNORMECEIINTERNATIONALEIECINTERNATIONAL60371-3-6STAN DARDPremière éditionFirst edition1992-11Spécification pour les matériaux isolantsà base de micaTroisième partie:Spécifications pour matériaux particuliersFeuille 6: Papier de mica renforcé de verre avecun agglomérant en résine époxyde à l'état BSpecification for insulating materialsbased on micaPart 3:Specifications for individual materialsSheet 6: Glass-backed mica paper witha B-stage epoxy resin binder© IEC 1992 Droits de reproduction réservés — Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niNo part of this publication may be reproduced or utilized inutilisée sous quelque forme que ce soit et par aucunany form or by any means, electronic or mechanical,procédé, électronique ou mécanique, y compris la photo-including photocopying and microfilm, without permission incopie et les microfilms, sans l'accord écrit de l'éditeur.writing from the publisher.International Electrotechnical Commission3, rue de Varembé Geneva, SwitzerlandTelefax: +41 22 919 0300e-mail: inmail@iec.chIEC web site http: //www.iec.chCommission Electrotechnique InternationaleInternational Electrotechnical CommissionMemigyHapoiniaR 311eKTp0TexHH4eCHÜH KOMHCCHAPour prix, voir catalogue en vigueur•For price, see current catalogueIEC•SIST EN 60371-3-6:1998
371-3-6 ©I EC– 3 –CONTENTSPageFOREWORD 5INTRODUCTION 7Clause1Scope 92Normative references 93Designation 94Requirements: raw materials 135Requirements: composition and tolerances 136Requirements for material (as received)
157Requirements for material after curing 178Packing
21SIST EN 60371-3-6:1998
371-3-6 ©IEC– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSIONSPECIFICATION FOR INSULATING MATERIALS BASED ON MICAPart 3: Specifications for individual materialsSheet 6: Glass-backed mica paperwith a B-stage epoxy resin binderFOREWORD1)The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees onwhich all the National Committees having a special interest therein are represented, express, as nearly aspossible, an international consensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the NationalCommittees in that sense.3)In order to promote international unification, the IEC expresses the wish that all National Committeesshould adopt the text of the IEC recommendation for their national rules in so far as national conditions willpermit. Any divergence between the IEC recommendation and the corresponding national rules should, asfar as possible, be clearly indicated in the latter.4)The IEC has not laid down any procedure concerning marking as an indication of approval and has noresponsibility when an item of equipment is declared to comply with one of its recommendations.This International Standard has been prepared by Sub-Committee 15C: Specifications, ofIEC Technical Committee No. 15: Insulating materials.The text of this standard is based on the following documents:DISReport on Voting
15C(CO)29315C(CO)318Full information on the voting for the approval of this standard can be found in the VotingReport indicated in the above table.SIST EN 60371-3-6:1998
371-3-6 ©IEC– 7 –INTRODUCTIONThis International Standard is one of a series which deals with insulating materials built upfrom mica splittings or mica paper.The series consists of three parts:Part 1: Definitions and general requirements (IEC 371-1).Part 2: Methods of test (IEC 371-2).Part 3: Specifications for individual materials (IEC 371-3).This standard contains one of the sheets comprising part 3, as follows:Sheet 6: Glass-backed mica paper with a B-stage epoxy resin binder.SIST EN 60371-3-6:1998
371-3-6 ©IEC– 9 –SPECIFICATION FOR INSULATING MATERIALS BASED ON MICAPart 3: Specifications for individual materialsSheet 6: Glass-backed mica paperwith a B-stage epoxy resin binder1 ScopeThis International Standard gives requirements for electrical insulating materials made bycombining mica paper with glass fabric and impregnating the mica paper with an epoxyresin. The material is supplied in a flexible state with the resin in the B-stage for final cureafter application. It may be supplied in the form of sheets or rolls.The specification covers material having nominal thickness from 0,09 mm to 0,28 mm.2 Normative referencesThe following normative documents contain provisions which, through reference in thistext, constitute provisions of this International Standard. At the time of publication, theeditions indicated were valid. All normative documents are subject to revision, and partiesto agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicatedbelow. Members of IEC and ISO maintain registers of currently valid InternationalStandards.!EC 243-1: 1988, Methods of test for electric strength of solid insulating materials - Part 1:Tests at power frequencies.IEC 371-2: 1987, Specification for insulating materials based on mica. Part 2: Methods oftest.IEC 371-3-2: 1991, Specification for insulating materials based on mica - Part 3: Specifi-cations for individual materials - Sheet 2: Mica paper.3 DesignationWhen ordering materials to this specification only the specification and type numbers needbe quoted (see tables 1 and 2).Example: IEC 371-3-6: type 6.1.01SIST EN 60371-3-6:1998
371-3-6 © I EC-11 -The type number is derived from:-the specification sheet number6-plus the sheet table number6.1plus the number of the product in the sheet table6.1.01.The descriptive code quoted in tables 1 and 2, for example G32/M75/R71 for type 6.1.01,table 1 is derived from:-glass content (G) 32 g/m2-muscovite mica content (M) 75 g/m2resin content (R) 71 g/m2.NOTE - For phiogopite mica paper the letter "M" is replaced by the letter "P" (table 2 only).Table 1 - Composition for calcinated muscovite mica paper(IEC 371-3-2, classes 1 and 2)GlassMicaResinMass/PermissibleDescriptivecontentcontentcontentunit areathickness rangeVolatilecontentTypecodeg/m2g/m2g/m2g/m2mmNom.Tol.Nom.Tol.Nom.Tol.Nom.Tol.MeanIndividualMax. %±±±±6.1.01G32/M75/R71323756719178190,12-0,150,11-0,161,06.1.02G32/M80/R71323807719183190,12-0,150,11-0,161,06.1.03G32/M90/R813239088110203210,15-0,180,14-0,191,06.1.04G32/M120/R1053231201010513257260,18-0,220,17-0,231,06.1.05G32/M150/R1203231501212015302300,20-0,240,19-0,251,06.1.06G32/M160/R1303231601313016322320,20-0,240,19-0,251,06.1.07G32/M180/R1503231801515019362370,22-0,260,21-0,271,06.1.08G32/M240/R1803232402018023452450,26-0,300,25-0,311,06.1.09G32/M250/R190323250211
...