IEC 60626-1:2009

IEC 60626-1 ®
Edition 3.0 2009-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Combined flexible materials for electrical insulation –
Part 1: Definitions and general requirements

Matériaux combinés souples destinés à l'isolement électrique –
Partie 1: Définitions et exigences générales

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IEC 60626-1 ®
Edition 3.0 2009-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Combined flexible materials for electrical insulation –
Part 1: Definitions and general requirements

Matériaux combinés souples destinés à l'isolement électrique –
Partie 1: Définitions et exigences générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
H
CODE PRIX
ICS 29.035.01 ISBN 978-2-88910-236-5
– 2 – 60626-1 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 1: Definitions and general requirements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60626-1 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This third edition cancels and replaces the second edition published in 1995 and its
amendment 1 (1996), of which it constitutes a technical revision. The main changes from the
previous edition are as follows:
The Scope was revised specifying treatment of mica paper, and Table 1 was revised
cancelling materials no longer in use and introducing newer materials.

60626-1 © IEC:2009 – 3 –
The text of this standard is based on the following documents:
CDV Report on voting
15/469/CDV 15/511/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60626 series, under the general title Combined flexible
materials for electrical insulation, can be found on the IEC website.
The committee has decided that the contents of this 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.
– 4 – 60626-1 © IEC:2009
INTRODUCTION
This International standard is one of a series which deals with combined flexible materials
consisting of two or more different insulating materials laminated together. The components of
the combined materials are plastic films and/or fibrous materials such as papers, woven or
non-woven fabrics, impregnated or not impregnated.
This series consist of three parts describing:
Part 1: Definitions and general requirements (IEC 60626-1)
Part 2: Methods of test (IEC 60626-2)
Part 3: Specifications for individual materials (IEC 60626-3)

60626-1 © IEC:2009 – 5 –
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 1: Definitions and general requirements

1 Scope
This part of IEC 60626 contains the definitions related to and the general requirements to be
fulfilled by combined flexible materials for electrical insulation. This standard does not include
mica paper, as primary component, covered by IEC 60371, but mica paper may be used as
complementary material.
Materials which conform to this specification meet established levels of performance.
However, the selection of material 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
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 The list of normative references is extensive because, in order to obtain a combination of two or more
materials for electrical insulation, it is necessary that those base materials (paper, film, etc) shall conform to the
requirements set forth, in the appropriate specification of the base material alone, for that purpose. This rule shall
be applied also in the development of new possible combinations; to this end, specifications of materials not
actually used, but referenced, may be eligible for future developments.
IEC 60554-3-1:1979, Specification for cellulosic papers for electrical purposes – Part 3:
Specifications for individual materials – Sheet 1: General purpose electrical paper
IEC 60626-3:2008, Combined flexible materials for electrical insulation – Part 3:
Specifications for individual materials
IEC 60641-3-2:2007, Pressboard and presspaper for electrical purposes – Part 3:
Specifications for individual materials – Sheet 2: Requirements for presspaper, types P.2.1,
P.4.1, P.4.2, P.4.3 and P.6.1
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
IEC 60674-3-4:1993, Specification for plastic films for electrical purposes – Part 3:
Specifications for individual materials – Sheet 4: Requirements for polyimide (PI) films used
for electrical insulation
– 6 – 60626-1 © IEC:2009
IEC 60674-3-8:—, Specification for plastic films for electrical purposes – Part 3: Specifications
for individual materials – Sheet 8: Requirements for balanced biaxially oriented polyethylene
naphthalate (PEN) films used for electrical insulation
IEC 60819-3-1:2001, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 1: Filled glass paper
IEC 60819-3-2:2001, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 2: Hybrid inorganic-organic paper
IEC 60819-3-3:2008, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 3: Unfilled aramid (aromatic polyamide) papers
IEC 60819-3-4: 2001, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 4: Aramid fibre paper containing not more than 50 % of mica
particles
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply:
3.1
full width material
material of production width, for example about 1 m, as ordered
3.2
slit material (tape)
material cut from full width material
3.3
duplex material
laminate consisting of two layers of insulating materials
3.4
triplex material
laminate consisting of three layers of insulating materials
3.5
quadruplex material
laminate consisting of four layers of insulating materials
4 Designation
Particular types of combined flexible insulating materials may be designated by using the
relevant combinations of code letters for the form and nature of the main components,
separated by a hyphen.
EXAMPLES: F – PI,
C – G.
The more commonly used materials are listed in Table 1.
—————————
To be published.
60626-1 © IEC:2009 – 7 –
Specific characteristics of a particular combined material (duplex or triplex, particular
characteristics of the basic material, impregnating material, bonding agent, etc.) are
described by additional data following the designation in Table 1.
EXAMPLE for designation: P-C/F-PET is a layer of paper consisting of cellulose, laminated
with a film consisting of polyethylene terephthalate.
In some cases, the identification of specific characteristics such as the following may be
useful:
Absorbent - porous Calendered type
Lengthwise oriented Lengthwise reinforced
Creped Embossed
Varnished Impregnated
NOTE This list is for guidance only and is not limiting. Code designations are in accordance with ISO standards.
Table 1 – Commonly used flexible materials
Form of Code Nature of the component Code IEC normative reference
component designation designation

Film F
60674-3-2
Polyethylene terephthalate PET

Polyethylene naphtalate 60674-3-8
PEN
60674-3-4
Polyimide PI
Paper and P Cellulose paper C 60554-3-1; 60641-3-2
non-woven
fabric and
Aramid paper (Aromatic PAa 60819-3-3; 60819-3-4
mats
Polyamide)
Polyethylene terephthalate non PET n. a.
woven
FG     60819-3-1
Filled glass paper
60819-3-2
H
Hybrid inorganic/organic paper

Woven C Cellulose C n. a.
fabrics Glass G
Polyethylene terephthalate PET
Adhesive A Thermoplastic Tp n. a.
Thermosetting Ts
n.a. = not available
5 General requirements
5.1 The material may be delivered in sheets cut to length or in rolls.
5.2 All materials in any one consignment shall be consistent and have properties within the
limits of this standard throughout the whole sheet or throughout the whole length of each roll.
The surface shall be uniform, reasonably smooth and reasonably free from defects such as
bubbles, pin holes, creases and flaws.

– 8 – 60626-1 © IEC:2009
5.3 When delivered in rolls, it shall be capable of being unrolled without damage.
5.4 The combined materials shall be free of conducting particles and other undesirable
inclusions.
5.5 Materials delivered in sheets cut to length shall be reasonably free from warp.
NOTE After bonding, materials produced in roll form often assume a
...