IEC 60371-3-4:1992/AMD1:2006

IEC 60371-3-4 ®
Edition 1.0 2006-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Specification for insulating materials based on mica –
Part 3: Specifications for individual materials – Sheet 4: Polyester film-backed
mica paper with a B-stage epoxy resin binder

Spécification pour les matériaux isolants à base de mica –
Partie 3: Spécifications pour matériaux particuliers – Feuille 4: Papier de mica
renforcé d'un film de polyester avec un agglomérant en résine époxyde à l'état B

IEC 60371-3-4:1992/A1:2006
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IEC 60371-3-4 ®
Edition 1.0 2006-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Specification for insulating materials based on mica –
Part 3: Specifications for individual materials – Sheet 4: Polyester film-backed
mica paper with a B-stage epoxy resin binder

Spécification pour les matériaux isolants à base de mica –
Partie 3: Spécifications pour matériaux particuliers – Feuille 4: Papier de mica
renforcé d'un film de polyester avec un agglomérant en résine époxyde à l'état B

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
E
CODE PRIX
ICS 29.035.50 ISBN 978-2-88910-179-5
– 2 – 60371-3-4 Amend. 1 © IEC:2006
FOREWORD
This amendment has been prepared by IEC technical committee 15: Standards on
specifications for electrical insulating materials.
This bilingual version, published in 2009-09, corresponds to the English version.
The text of this amendment is based on the following documents:
FDIS Report on voting
15/332/FDIS 15/347/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The French version of this amendment has not been voted upon.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
Page 7
INTRODUCTION
Replace the existing text by the following new text:
This International Standard is one of a series which deals with insulating materials for use in
electrical equipment built up from mica splittings or mica paper, with or without reinforcement,
and with mica paper in its pure state.
The series consists of the following three parts:
Part 1: Definitions and general requirements (IEC 60371-1)
Part 2: Methods of test (IEC 60371-2)
Part 3: Specifications for individual materials (IEC 60371-3)
This standard contains one of the sheets comprising part 3, as follows:
Sheet 4: Polyester film-backed mica paper with a B-stage epoxy resin binder.

60371-3-4 Amend. 1 © IEC:2006 – 3 –
Page 9
1 Scope
Insert the following two paragraphs after the existing paragraphs:
Materials which conform to this specification meet established levels of performance.
However, the selection of materials by a user for a specific application should be 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
Replace the existing references by the following:
IEC 60243-1:1998, Electric strength of insulating materials – Test methods - Part 1: Tests at
power frequencies
IEC 60371-2:2004, Specification for insulating materials based on mica – Part 2: Methods of
test
IEC 60371-3-2:2005, Insulating materials based on mica – Part 3: Specifications for individual

materials – Sheet 2: Mica paper
IEC 60674-3-2:1992, Specification for plastic films for electrical purposes – Part 3:
Specifications for individual materials – Sheet 2: Requirements for balanced biaxially oriented
polyethylene terephthalate (PET) films used for electrical insulation
3 Designation
Replace the existing first two paragraphs by the following new paragraphs:
When ordering materials to this specification, only the specification and type numbers need
be quoted (see Table 1).
Example: IEC 60371-3-4: type 4.1.01
The type number is derived from:
– the specification sheet number 4
– followed by the sheet table number 1
– followed by the number of the product in the sheet table 01
Thus giving type number 4.1.01.
The final paragraph and table remain unchanged.

– 4 – 60371-3-4 Amend. 1 © IEC:2006
Page 11
4 Requirements: raw materials
4.1 Mica paper
Replace the existing text of this subclause by the following new text:
Mica paper referred to in this specification shall comply with the requirements of IEC 60371-3-2.
4.2 Polyester film
Replace the existing text of this subclause by the following new text:
Plastic films used as backing material shall be PET and shall comply with the requirements of
IEC 60674-3-2.
Page 13
5 Requirements: compositions and tolerances
Replace the existing text of this clause by the following new text:
When tested by the me
...