IEC 60626-3:2008

Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials

IEC 60626-3:2008 gives dimensional and performance requirements for individual combined flexible materials for electrical insulation. This part is in the form of groups of sheets. This standard contains 31 sheets of Part 3, as follows: 100, 101, 102, 110, 111, 112, 113, 114, 115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351, 360, 400, 401, 402, 403, 410, 411, 420, 421, 502, 503, 505. The main change from the previous edition is the consolidation of amendment 1 published in 1999 which was mainly describing the sheets from 340 to 459.

Matériaux combinés souples destinés à l'isolement électrique - Partie 3: Spécifications pour matériaux particuliers

la CEI 60626-3:2008 spécifie les exigences relatives aux dimensions et aux performances des matériaux combinés souples individuels destinés à l'isolement électrique. Cette partie se présente sous la forme de groupes de feuilles. La présente norme comprend 31 feuilles constituant la Partie 3, comme suit: 100, 101, 102, 110, 111, 112, 113, 114, 115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351, 360, 400, 401, 402, 403, 410, 411, 420, 421, 502, 503, 505. Le principale modification par rapport à l'édition précédente est le suivant: consolidation de l'amendement 1 publié en 1999, qui décrivait principalement les feuilles 340 à 459.

General Information

• Status: Published
• Publication Date: 20-Jul-2008
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 15 - Solid electrical insulating materials
• Drafting Committee: MT 10 - TC 15/MT 10
• Current Stage: PPUB - Publication issued
• Start Date: 21-Jul-2008
• Completion Date: 15-Aug-2008

Relations

• Amended By: IEC 60626-3:2008/AMD1:2012 - Amendment 1 - Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials
• Effective Date: 05-Sep-2023
• Revises: IEC 60626-3:1996/AMD1:1999 - Amendment 1 - Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials
• Effective Date: 05-Sep-2023
• Revises: IEC 60626-3:1996 - Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials
• Effective Date: 05-Sep-2023
• Revises: IEC 60626-3:1996/COR1:1999 - Corrigendum 1 - Combined flexible materials for electrical insulation - Part 3: Specifications for individual materials
• Effective Date: 05-Sep-2023

IEC 60626-3:2008 - Combined Flexible Materials for Electrical Insulation (Part 3: Specifications for Individual Materials)

Overview

IEC 60626-3:2008 is an international standard published by the International Electrotechnical Commission (IEC) that specifies dimensional and performance requirements for combined flexible materials used in electrical insulation. Part 3 of this series focuses on detailed specifications for individual materials presented in the form of multiple groups of sheets. This comprehensive standard ensures global consistency and reliability in the use of flexible electrical insulating materials.

The 2008 edition, updated with Amendment 1 in 2012, consolidates previous amendments and organizes specifications into 31 sheets covering various configurations of layered flexible materials. These combined flexible materials, such as layered films and papers, are critical in insulation applications within electrical and electronic equipment.

Key Topics

• Material Specifications: IEC 60626-3 outlines requirements for numerous combined flexible insulation materials-including combinations of polyethylene terephthalate (PET) films, presspapers, aramid papers, hybrid inorganic-organic papers, and filled glass papers.
• Dimensional Requirements: Each specification sheet defines precise thickness, layer composition, and dimensional tolerances to ensure uniformity and functional integrity.
• Performance Criteria: The standard specifies electrical, mechanical, thermal, and environmental performance benchmarks aligned with the application needs of these insulation materials.
• Thermal Classification: It includes guidelines for thermal classification suited for different operating temperature ranges, ensuring material stability and safety.
• Sheet-Based Format: Individual materials and layered material combinations are organized into numbered sheets (e.g., Sheet 100, Sheet 340), each targeting specific material combinations and constructions.
• Material Combinations Covered:
  • Duplex and triplex layered materials such as PET film with presspaper or paper
  • Aramid paper combined with PET or polyimide (PI) films
  • Hybrid inorganic-organic papers combined with PET films or filled glass papers
  • Filled glass papers combined with PET films or woven glass cloth
  • PET mats combined with PET films

Applications

IEC 60626-3:2008 plays a critical role in ensuring that combined flexible insulation materials used in electrical devices meet strict safety and reliability standards. Typical applications include:

• Electrical insulation in transformers, coils, and rotating electrical machines
• Insulating layers in capacitors and other electrical components
• Flexible insulation barriers in power generation and distribution equipment
• Protective layers in high-voltage electrical apparatus

This standard assists manufacturers in selecting appropriate insulation materials that meet international performance and quality benchmarks, while enabling engineers and designers to specify materials with confidence in electrical safety and durability.

Related Standards

• IEC 60626 Series: This is the third part in the IEC 60626 series dealing with combined flexible materials for electrical insulation. The other parts address general aspects and test methods.
• IEC 60216: Thermal endurance tests applicable to electric insulating materials that complement the thermal classifications in IEC 60626-3.
• IEC 60085: Electrical insulation system thermal classification method relevant to materials covered in this specification.
• ISO/IEC Directives: The preparation and revision of IEC 60626-3 conform to these directives ensuring internationally recognized development processes.

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Keywords: IEC 60626-3, flexible electrical insulation materials, combined flexible materials, insulation specifications, electrical insulation standards, PET film insulation, aramid paper insulation, hybrid inorganic-organic papers, electrical insulation performance, thermal classification insulation, IEC electrical standards, international insulation materials standard.

For more information on IEC 60626-3 and to obtain the latest edition, visit the official IEC Webstore at www.iec.ch.

Standards Content (Sample)

IEC 60626-3
Edition 3.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Combined flexible materials for electrical insulation –
Part 3: Specifications for individual materials

Matériaux combinés souples destinés à l'isolement électrique –
Partie 3: Spécifications pour matériaux particuliers

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IEC 60626-3
Edition 3.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Combined flexible materials for electrical insulation –
Part 3: Specifications for individual materials

Matériaux combinés souples destinés à l'isolement électrique –
Partie 3: Spécifications pour matériaux particuliers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XB
CODE PRIX
ICS 29.035.01 ISBN 2-8318-9896-X
– 2 – 60626-3 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references.7
3 Requirements .8
4 Designation .8
5 Thermal classification .8
6 Specification sheets.8
Sheet 100 Requirements for combined flexible duplex materials of two layers    –
F-ET/P-C (23 μm PET film with presspaper or paper) .10
Sheet 101 Requirements for combined flexible duplex materials of two layers   –
F-ET/P-C (36 μm PET film with presspaper or paper) .12
Sheet 102 Requirements for combined flexible duplex materials of two layers   –
F-PET/P-C (50 μm PET film with presspaper or paper) .14
Sheet 110 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (23 μm PET film with presspaper or paper) .16
Sheet 111 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (36 μm PET film with presspaper or paper) .
Sheet 112 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (50 μm PET film with presspaper or paper) .20
Sheet 113 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (75 μm PET film with presspaper or paper) .22
Sheet 114 Requirements for combined flexible triplex materials of three layers  –
P-C/F-PET/P-C (100 μm PET film with presspaper or paper) .24
Sheet 115 Requirements for combined flexible triplex materials of three layers  –
P-C/F-PET/P-C (125 μm PET film with presspaper or paper) .26
Sheet 302 Requirements for combined flexible duplex materials of two layers   –
P-PAa/F-PET (50 μm aramid calendered paper with PET film) .28
Sheet 303 Requirements for combined flexible duplex materials of two layers   –
P-PAa/F-PET (80 μm aramid calendered paper with PET film) .30
Sheet 312 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (50 μm aramid calendered paper on both sides of PET film) .32
Sheet 313 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (80 μm aramid calendered paper on both sides of PET film) .34
Sheet 315 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (130 μm aramid calendered paper on both sides of PET film) .36
Sheet 320 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (130 μm aramid uncalendered paper on both sides of PET film) .38
Sheet 330 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PI/P-PAa (aramid calendered paper on both sides of PI film) .40
Sheet 340 Requirements for combined flexible duplex materials of two layers   –
P-H/F-PET (hybrid inorganic-organic paper with PET film) .42
Sheet 350 Requirements for combined flexible triplex materials of three layers  –
P-H/F-PET/P-H (75 μm hybrid inorganic-organic paper on both sides of PET film) .44
Sheet 351 Requirements for combined flexible triplex materials of three layers  –
P-H/F-PET/P-H (125 μm hybrid inorganic-organic paper on both sides of PET film).46

60626-3 © IEC:2008 – 3 –
Sheet 360 Requirements for combined flexible triplex materials of three layers  –
P-H/P-FG type 1/P-H (hybrid inorganic-organic paper on both sides of type 1 filled
glass paper).48
Sheet 400 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 25 μm PET film) .50
Sheet 401 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 50 μm PET film) .52
Sheet 402 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 75 μm PET film) .54
Sheet 403 Requirements for combined flexible duplex materials of two layers   –
P-FG type 2/F-PET (type 2 filled glass paper with PET film).56
Sheet 410 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/C-G (type 1 filled glass paper with woven glass cloth) .58
Sheet 411 Requirements for combined flexible duplex materials of two layers   –
P-FG type 2/C-G (type 2 filled glass paper with woven glass cloth) .60
Sheet 420 Requirements for combined flexible triplex materials of three layers  –
P-FG type 1/F-PET/P-FG type 1 (type 1 filled glass paper on both sides of PET film) .62
Sheet 421 Requirements for combined flexible triplex materials of three layers  –
P-FG type 2/F-PET/P-FG type 2 (type 2 filled glass paper on both sides of PET film) .
Sheet 502 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (50 μm PET mat on both sides of PET film) .66
Sheet 503 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (75 μm PET mat on both sides of PET film) .68
Sheet 505 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (125 μm PET mat on both sides of PET film) .70
Bibliography .72

Table 1 – Master listing for IEC 60626-3 sheet identification .

– 4 – 60626-3 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 3: Specifications for individual materials

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,
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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
members of its technical committees and IEC National Committees for any personal injury, property damage or
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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 60626-3 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This third edition cancels and replaces the second edition published in 1996 and its
amendment 1 (1999), and constitutes a technical revision. The main changes from the previous
edition are as follows:
– consolidation of amendment 1 published in 1999 which was mainly describing the sheets
from 340 to 459;
– revision and reordering of previous tables of 1996 edition.

60626-3 © IEC:2008 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
15/442/FDIS 15/465/RVD
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.
– 6 – 60626-3 © IEC:2008
INTRODUCTION
This standard contains 31 sheets of Part 3, as follows:
100, 101, 102, 110, 111, 112, 113, 114, 115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351,
360, 400, 401, 402, 403, 410, 411, 420, 421, 502, 503, 505.

60626-3 © IEC:2008 – 7 –
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 3: Specifications for individual materials

1 Scope
This part of IEC 60626 specifies dimensional and performance requirements for individual
combined flexible materials for electrical insulation. This part is in the form of groups of sheets.
Sheets are numbered in accordance with Table 1, which provides a complete list of all the
specification sheets belonging to this standard.
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.
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 60554-1:1977, Specification for cellulosic papers for electrical purposes – Part 1:
Definitions and general requirements
IEC 60554-3 (all parts), Specification for cellulosic papers for electrical purposes – Part 3:
Specifications for individual materials
IEC 60626-1:1995, Combined flexible materials for electrical insulation – Part 1: Definitions and
general requirements
IEC 60626-2:1995, Combined flexible materials for electrical insulation – Part 2: Methods
of test
IEC 60641-1:2008, Pressboard and presspaper for electrical purposes – Part 1: Definitions and
general requirements
IEC 60641-3-2:2008, 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
– 8 – 60626-3 © IEC:2008
IEC 60674-1:1980, Specification for plastic films for electrical purposes – Part 1: Definitions
and general requirements
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 films used for
electrical insulation
IEC 60819-1:1995, Non-cellulosic papers for electrical purposes – Part 1: Definitions and
general requirements
Amendment 1 (1996)
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 60819-3-3:2006, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 3: Unfilled aramid (aromatic polyamide) papers
3 Requirements
In addition to complying with the general requirements of IEC 60626-1, each flexible combined
laminate shall conform to the requirements set forth in the appropriate sheet corresponding to
its type, as shown in the sheets of this standard.
4 Designation
Table 1 lists material designations and constructions appropriate to each sheet. Material
conforming to this specification shall be identified by a designation containing the IEC standard
number, the material designation from IEC 60626-1 and the nominal thickness. For example:
IEC 60626-3, Sheet 112, P-C/F-PET/P-C, 0,15 mm
5 Thermal classification
Performance experience provides information about the thermal capability of combined flexible
materials in electrical insulation systems. This information is given in each individual sheet.
Thermal classification information on these sheets is not to be considered as a requirement.
6 Specification sheets
The presently 31 sheets listed in the Introduction are organised according to the composition of
the laminates as described in the following master listing Table 1, including sections that could
be offered by the market in the future; therefore classification numbering is already provided
for future growth.
60626-3 © IEC:2008 – 9 –
Table 1 – Master listing for IEC 60626-3 sheet identification
Sheet No. Flexible laminate composition
100 to 149 Paper or presspaper containing sulphate wood pulp fibres
100 to 109 Duplex with PET film
110 to 119 Triplex with PET film
a
120 to 149 Others
a
150 to 199 Paper or presspaper containing cotton fibres
a
150 to 159 Duplex with PET film
a
160 to 169 Triplex with PET film
a
170 to 199 Others
a
200 to 249 Paper or presspaper containing both cotton and wood pulp fibres
a
200 to 209 Duplex with PET film
a
210 to 219 Triplex with PET film
a
220 to 249 Others
250 to 299 Paper or presspaper containing other cellulosic fibres or mixtures of cellulosic and non-
a
cellulosic fibers
300 to 399 Wet-laid paper containing organic non-cellulosic fibres
300 to 309 Duplex calendered aramid with PET film
310 to 319 Triplex calendered aramid with PET film
320 to 329 Triplex uncalendered aramid with PET film
330 to 339 Triplex calendered aramid with PI film
340 to 349 Duplex hybrid organic-inorganic with PET film
350 to 359 Triplex hybrid organic-inorganic with PET film
360 to 369 Triplex hybrid organic-inorganic with filled glass paper
a
370 to 399 Others
400 to 499 Wet-laid paper containing inorganic fibres
400 to 459 Glass
a
460 to 499 Others
500 to 599 Dry-laid non-woven containing organic fibres
500 to 519 100 % PET-based fibres
a
520 to 539 100 % aramid-based fibres
a
540 to 599 Others
600 to 999 Other constructions
a
Sections provided for future development of new specification sheets at present are void.
The specification sheets developed for the time being are: 100, 101, 102, 110, 111, 112, 113, 114,
115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351, 360, 400, 401, 402, 403, 410, 411, 420, 421,
502, 503, 505, and are given below.

– 10 – 60626-3 © IEC:2008
Sheet 100
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (23 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film
(F-PET) having a nominal thickness of 23 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3 or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2, P4 or P6 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film, which has a nominal thickness of 23 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 6 kV;
– for folded specimens: 5 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below:

60626-3 © IEC:2008 – 11 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,10 0,13 0,15 0,18 0,20 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 15 15 10 10 10 10 10
thickness
tolerance
g/m
Laminate
115 155 190 215 250 300 370 430 490 610 730
±12 %
nominal
grammage
Tensile strength N/10 mm
90 100 135 150 180 220 270 300 360 450 540
unfolded min.
60 70 90 100 120 140 180 200 240 300 360
MD
CMD
Tensile N/10 mm
70 80 100 110 140 170 210 240 280 350 420
strength folded, 4
min.
film inside 40 50 60 70 80 100 120 140 160 200 240
MD
CMD
Elongation, % min.
unfolded MD 3 3 3 3 5 5 5 5 5 5 5
10 10 10 10 13 13 13 13 13 13 13
CMD
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 12 – 60626-3 © IEC:2008
Sheet 101
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (36 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper containing
sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film (F-PET) having
a nominal thickness of 36 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2, P4 or P6 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 36 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 7 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 13 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 10 10 10 10 10 10
thickness
tolerance
g/m
Laminate
3 120 190 250 280 370 395 490 510 610 730
±12 %
nominal
grammage
Tensile strength N/10 mm
unfolded min.
90 135 180 190 270 280 360 380 450 540
MD
60 90 120 130 180 190 240 250 300 360
CMD
Tensile N/10 mm
strength folded, 4
min.
film inside
70 100 130 150 200 230 270 300 340 410
MD
40 60 80 90 120 130 160 170 200 240
CMD
Elongation, % min.
3 3 5 5 5 5 5 5 5 5
unfolded 4 MD
10 10 13 13 13 13 13 13 13 13
CMD
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 14 – 60626-3 © IEC:2008
Sheet 102
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (50 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper containing
sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film (F-PET) having
a nominal thickness of 50 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 50 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 8 kV;
– for folded specimens:  6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 15 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 190 245 305 360 420 480 535 590 700
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 120 150 190 240 300 360 380 400
CMD
80 90 95 105 120 150 180 190 200

Tensile N/10 mm
strength folded,
min.
film inside
MD
70 80 95 130 180 230 275 300 320
CMD
40 50 60 90 115 145 175 180 190

Elongation, % min.
unfolded 4 MD 3 3 3 3 5 5 5 5 5
CMD
10 10 10 10 13 13 13 13 13
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 16 – 60626-3 © IEC:2008
Sheet 110
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (23 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 23 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 23 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 6 kV;
– for folded specimens: 5 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 17 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,12 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 140 170 230 270 370 430 490 550 610 730
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 135 160 190 270 300 360 400 450 540
CMD
70 90 120 130 160 200 240 270 300 360

Tensile N/10 mm
strength folded
min.
MD
60 105 140 150 210 240 260 310 350 420
CMD
40 60 80 90 120 135 160 175 200 240

Elongation, % min.
unfolded 4 MD 3 3 5 5 5 5 5 5 5 5
CMD
10 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 18 – 60626-3 © IEC:2008
Sheet 111
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (36 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 36 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 36 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 7 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 19 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,12 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 150 180 240 300 370 430 490 550 610 730
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 135 180 200 270 300 360 400 450 540

CMD
75 100 120 130 180 200 240 255 300 360

Tensile N/10 mm
strength folded
min.
MD
85 100 140 160 210 230 280 300 350 420
CMD
50 60 80 90 120 130 160 175 200 240

Elongation, % min.
unfolded 4 MD 5 5 5 5 5 5 5 5 5 5
CMD
10 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 20 – 60626-3 © IEC:2008
Sheet 112
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (50 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 50 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 50 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 8 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 21 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,15 0,25 0,30 0,35 0,40 0,45 0,50 0,55
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 200 320 380 440 490 550 620 700
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
135 200 270 310 360 400 450 540
CMD
100 130 180 200 240 255 300 360

Tensile N/10 mm
strength folded
min.
MD
100 160 210 235 280 300 350 420
CMD
60 80 120 130 160 175 200 240
Elongation, % min.
unfolded 4 MD 3 3 3 3 5 5 5 5
CMD
10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 22 – 60626-3 © IEC:2008
Sheet 113
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (75 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 75 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 75 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 10 kV;
– for folded specimens:  9 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 23 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate
2 mm 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
nominal
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 190 240 310 380 430 510 560 620 740
±12 %
grammage
Tensile N/10 mm
strength min.
MD
140 190 230 280 330 380 420 470 570
unfolded
CMD
105 140 170 210 240 280 310 350 420

Tensile N/10 mm
strength folded 4
min.
MD
100 130 160 200 230 270 300 340 410
CMD
65 90 110 120 130 180 200 220 270

Elongation, % min.
unfolded 4 MD 5 5 5 5 5 5 5 5 5
CMD 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 24 – 60626-3 © IEC:2008
Sheet 114
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (100 μm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 100 μm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 100 μm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 11 kV;
– for folded specimens: 9 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3 © IEC:2008 – 25 –
Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,20 0,30 0,40 0,50
thickness
Laminate
2 ± % 15 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 250 380 510 620
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
200 300 400 500
CMD
160 240 320 400
Tensile N/10 mm
strength folded
min.
MD
140 210 280 350
CMD
100 150 200 250
Elongation, % min.
unfolded 4 MD 5 5 5 5
CMD
10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
--------------------
...

IEC 60626-3 ®
Edition 3.1 2012-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Combined flexible materials for electrical insulation –
Part 3: Specifications for individual materials
Matériaux combinés souples destinés à l'isolement électrique –
Partie 3: Spécifications pour matériaux particuliers
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IEC 60626-3 ®
Edition 3.1 2012-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Combined flexible materials for electrical insulation –
Part 3: Specifications for individual materials
Matériaux combinés souples destinés à l'isolement électrique –
Partie 3: Spécifications pour matériaux particuliers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.01 ISBN 978-2-8322-4312-1
– 2 – 60626-3  IEC:2008+A1:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Requirements . 8
4 Designation . 8
5 Thermal classification . 8
6 Specification sheets . 8
Sheet 100 Requirements for combined flexible duplex materials of two layers    –
F-ET/P-C (23 µm PET film with presspaper or paper) . 10
Sheet 101 Requirements for combined flexible duplex materials of two layers   –
F-ET/P-C (36 µm PET film with presspaper or paper) . 12
Sheet 102 Requirements for combined flexible duplex materials of two layers   –

F-PET/P-C (50 µm PET film with presspaper or paper) . 14
Sheet 110 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (23 µm PET film with presspaper or paper) . 16
Sheet 111 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (36 µm PET film with presspaper or paper) . 18
Sheet 112 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (50 µm PET film with presspaper or paper) . 20
Sheet 113 Requirements for combined flexible triplex materials of three layers   –
P-C/F-PET/P-C (75 µm PET film with presspaper or paper) . 22
Sheet 114 Requirements for combined flexible triplex materials of three layers  –
P-C/F-PET/P-C (100 µm PET film with presspaper or paper) . 24
Sheet 115 Requirements for combined flexible triplex materials of three layers  –
P-C/F-PET/P-C (125 µm PET film with presspaper or paper) . 26
Sheet 302 Requirements for combined flexible duplex materials of two layers   –
P-PAa/F-PET (50 µm aramid calendered paper with PET film) . 28
Sheet 303 Requirements for combined flexible duplex materials of two layers   –
P-PAa/F-PET (80 µm aramid calendered paper with PET film) . 30
Sheet 312 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (50 µm aramid calendered paper on both sides of PET film) . 32
Sheet 313 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (80 µm aramid calendered paper on both sides of PET film) . 34
Sheet 315 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (130 µm aramid calendered paper on both sides of PET film) . 36
Sheet 320 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PET/P-PAa (130 µm aramid uncalendered paper on both sides of PET film) . 38
Sheet 330 Requirements for combined flexible triplex materials of three layers  –
P-PAa/F-PI/P-PAa (aramid calendered paper on both sides of PI film) . 40
Sheet 340 Requirements for combined flexible duplex materials of two layers   –
P-H/F-PET (hybrid inorganic-organic paper with PET film) . 42
Sheet 350 Requirements for combined flexible triplex materials of three layers  –
P-H/F-PET/P-H (75 µm hybrid inorganic-organic paper on both sides of PET film) . 44
Sheet 351 Requirements for combined flexible triplex materials of three layers  –
P-H/F-PET/P-H (125 µm hybrid inorganic-organic paper on both sides of PET film) . 46
Sheet 352 Requirements for combined flexible triplex materials of three layers –
P-H/F-PET/P-H (60 µm hybrid inorganic-organic paper on both sides of PET film) . 48

60626-3  IEC:2008+A1:2012 – 3 –
Sheet 360 Requirements for combined flexible triplex materials of three layers  –
P-H/P-FG type 1/P-H (hybrid inorganic-organic paper on both sides of type 1 filled
glass paper) . 50
Sheet 400 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 25 µm PET film) . 52
Sheet 401 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 50 µm PET film) . 54
Sheet 402 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/F-PET (type 1 filled glass paper with 75 µm PET film) . 56
Sheet 403 Requirements for combined flexible duplex materials of two layers   –
P-FG type 2/F-PET (type 2 filled glass paper with PET film) . 58
Sheet 410 Requirements for combined flexible duplex materials of two layers   –
P-FG type 1/C-G (type 1 filled glass paper with woven glass cloth) . 60
Sheet 411 Requirements for combined flexible duplex materials of two layers   –
P-FG type 2/C-G (type 2 filled glass paper with woven glass cloth) . 62
Sheet 420 Requirements for combined flexible triplex materials of three layers  –
P-FG type 1/F-PET/P-FG type 1 (type 1 filled glass paper on both sides of PET film) . 64
Sheet 421 Requirements for combined flexible triplex materials of three layers  –
P-FG type 2/F-PET/P-FG type 2 (type 2 filled glass paper on both sides of PET film) . 66
Sheet 502 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (50 µm PET mat on both sides of PET film) . 68
Sheet 503 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (75 µm PET mat on both sides of PET film) . 70
Sheet 505 Requirements for combined flexible triplex materials of three layers  –
P-PET/F-PET/P-PET (125 µm PET mat on both sides of PET film) . 72

Bibliography . 74

Table 1 – Master listing for IEC 60626-3 sheet identification . 9

– 4 – 60626-3  IEC:2008+A1:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 3: Specifications for individual materials
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
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.
This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 60626-3 edition 3.1 contains the third edition (2008) [documents 15/442/FDIS and 15/465/
RVD] and its amendment 1 (2012) [documents 15/647/CDV and 15/673A/RVC].
A vertical line in the margin shows where the base publication has been modified by
amendment 1. Additions and deletions are displayed in red, with deletions being struck
through.
60626-3  IEC:2008+A1:2012 – 5 –
International Standard IEC 60626-3 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This third edition cancels and replaces the second edition published in 1996 and its
amendment 1 (1999), and constitutes a technical revision. The main changes from the previous
edition are as follows:
– consolidation of amendment 1 published in 1999 which was mainly describing the sheets
from 340 to 459;
– revision and reordering of previous tables of 1996 edition.
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 the base publication and its amendments will
remain unchanged until the stability 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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.

– 6 – 60626-3  IEC:2008+A1:2012
INTRODUCTION
This standard contains 31 32 sheets of Part 3, as follows:
100, 101, 102, 110, 111, 112, 113, 114, 115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351,
352, 360, 400, 401, 402, 403, 410, 411, 420, 421, 502, 503, 505.

60626-3  IEC:2008+A1:2012 – 7 –
COMBINED FLEXIBLE MATERIALS
FOR ELECTRICAL INSULATION –
Part 3: Specifications for individual materials

1 Scope
This part of IEC 60626 specifies dimensional and performance requirements for individual
combined flexible materials for electrical insulation. This part is in the form of groups of sheets.
Sheets are numbered in accordance with Table 1, which provides a complete list of all the
specification sheets belonging to this standard.
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.
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 60554-1:1977, Specification for cellulosic papers for electrical purposes – Part 1:
Definitions and general requirements
IEC 60554-3 (all parts), Specification for cellulosic papers for electrical purposes – Part 3:
Specifications for individual materials
IEC 60626-1:1995, Combined flexible materials for electrical insulation – Part 1: Definitions and
general requirements
IEC 60626-2:1995, Combined flexible materials for electrical insulation – Part 2: Methods
of test
IEC 60641-1:2008, Pressboard and presspaper for electrical purposes – Part 1: Definitions and
general requirements
IEC 60641-3-2:2008, 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
– 8 – 60626-3  IEC:2008+A1:2012
IEC 60674-1:1980, Specification for plastic films for electrical purposes – Part 1: Definitions
and general requirements
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 films used for
electrical insulation
IEC 60819-1:1995, Non-cellulosic papers for electrical purposes – Part 1: Definitions and
general requirements
Amendment 1 (1996)
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 60819-3-3:2006, Non-cellulosic papers for electrical purposes – Part 3: Specifications for
individual materials – Sheet 3: Unfilled aramid (aromatic polyamide) papers
3 Requirements
In addition to complying with the general requirements of IEC 60626-1, each flexible combined
laminate shall conform to the requirements set forth in the appropriate sheet corresponding to
its type, as shown in the sheets of this standard.
4 Designation
Table 1 lists material designations and constructions appropriate to each sheet. Material
conforming to this specification shall be identified by a designation containing the IEC standard
number, the material designation from IEC 60626-1 and the nominal thickness. For example:
IEC 60626-3, Sheet 112, P-C/F-PET/P-C, 0,15 mm
5 Thermal classification
Performance experience provides information about the thermal capability of combined flexible
materials in electrical insulation systems. This information is given in each individual sheet.
Thermal classification information on these sheets is not to be considered as a requirement.
6 Specification sheets
The presently 31 32 sheets listed in the Introduction are organised according to the
composition of the laminates as described in the following master listing Table 1, including
sections that could be offered by the market in the future; therefore classification numbering is
already provided for future growth.

60626-3  IEC:2008+A1:2012 – 9 –
Table 1 – Master listing for IEC 60626-3 sheet identification
Sheet No. Flexible laminate composition
100 to 149 Paper or presspaper containing sulphate wood pulp fibres
100 to 109 Duplex with PET film
110 to 119 Triplex with PET film
a
120 to 149 Others
a
150 to 199 Paper or presspaper containing cotton fibres
a
150 to 159 Duplex with PET film
a
160 to 169 Triplex with PET film
a
170 to 199 Others
a
200 to 249 Paper or presspaper containing both cotton and wood pulp fibres
a
200 to 209 Duplex with PET film
a
210 to 219 Triplex with PET film
a
220 to 249 Others
250 to 299 Paper or presspaper containing other cellulosic fibres or mixtures of cellulosic and non-
a
cellulosic fibers
300 to 399 Wet-laid paper containing organic non-cellulosic fibres
300 to 309 Duplex calendered aramid with PET film
310 to 319 Triplex calendered aramid with PET film
320 to 329 Triplex uncalendered aramid with PET film
330 to 339 Triplex calendered aramid with PI film
340 to 349 Duplex hybrid organic-inorganic with PET film
350 to 359 Triplex hybrid organic-inorganic with PET film
360 to 369 Triplex hybrid organic-inorganic with filled glass paper
a
370 to 399 Others
400 to 499 Wet-laid paper containing inorganic fibres
400 to 459 Glass
a
460 to 499 Others
500 to 599 Dry-laid non-woven containing organic fibres
500 to 519 100 % PET-based fibres
a
520 to 539 100 % aramid-based fibres
a
540 to 599 Others
600 to 999 Other constructions
a
Sections provided for future development of new specification sheets at present are void.
The specification sheets developed for the time being are: 100, 101, 102, 110, 111, 112, 113, 114,
115, 302, 303, 312, 313, 315, 320, 330, 340, 350, 351, 352, 360, 400, 401, 402, 403, 410, 411, 420,
421, 502, 503, 505, and are given below.

– 10 – 60626-3  IEC:2008+A1:2012
Sheet 100
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (23 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film
(F-PET) having a nominal thickness of 23 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3 or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2, P4 or P6 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film, which has a nominal thickness of 23 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 6 kV;
– for folded specimens: 5 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below:

60626-3  IEC:2008+A1:2012 – 11 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,10 0,13 0,15 0,18 0,20 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 15 15 10 10 10 10 10
thickness
tolerance
g/m
Laminate
115 155 190 215 250 300 370 430 490 610 730
±12 %
nominal
grammage
Tensile strength N/10 mm
90 100 135 150 180 220 270 300 360 450 540
unfolded min.
60 70 90 100 120 140 180 200 240 300 360
MD
CMD
Tensile N/10 mm
70 80 100 110 140 170 210 240 280 350 420
strength folded, 4
min.
40 50 60 70 80 100 120 140 160 200 240
film inside
MD
CMD
Elongation, % min.
unfolded MD 3 3 3 3 5 5 5 5 5 5 5
10 10 10 10 13 13 13 13 13 13 13
CMD
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 12 – 60626-3  IEC:2008+A1:2012
Sheet 101
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (36 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper containing
sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film (F-PET) having
a nominal thickness of 36 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2, P4 or P6 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 36 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 7 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 13 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 10 10 10 10 10 10
thickness
tolerance
g/m
Laminate
3 120 190 250 280 370 395 490 510 610 730
±12 %
nominal
grammage
Tensile strength N/10 mm
unfolded min.
90 135 180 190 270 280 360 380 450 540
MD
60 90 120 130 180 190 240 250 300 360
CMD
Tensile N/10 mm
strength folded, 4
min.
film inside
70 100 130 150 200 230 270 300 340 410
MD
40 60 80 90 120 130 160 170 200 240
CMD
Elongation, % min.
3 3 5 5 5 5 5 5 5 5
unfolded 4 MD
10 10 13 13 13 13 13 13 13 13
CMD
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 14 – 60626-3  IEC:2008+A1:2012
Sheet 102
Requirements for combined flexible duplex materials of two layers –
F-PET/P-C (50 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for duplex materials consisting of paper or presspaper containing
sulphate wood pulp fibres (P-C) laminated on a polyethylene terephthalate film (F-PET) having
a nominal thickness of 50 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 50 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 8 kV;
– for folded specimens:  6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 15 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 15 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 190 245 305 360 420 480 535 590 700
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 120 150 190 240 300 360 380 400
CMD
80 90 95 105 120 150 180 190 200

Tensile N/10 mm
strength folded,
min.
film inside
MD
70 80 95 130 180 230 275 300 320
CMD
40 50 60 90 115 145 175 180 190

Elongation, % min.
unfolded 4 MD 3 3 3 3 5 5 5 5 5
CMD
10 10 10 10 13 13 13 13 13
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 16 – 60626-3  IEC:2008+A1:2012
Sheet 110
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (23 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 23 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 23 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 6 kV;
– for folded specimens: 5 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 17 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,12 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 140 170 230 270 370 430 490 550 610 730
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 135 160 190 270 300 360 400 450 540
CMD
70 90 120 130 160 200 240 270 300 360

Tensile N/10 mm
strength folded
min.
MD
60 105 140 150 210 240 260 310 350 420
CMD
40 60 80 90 120 135 160 175 200 240

Elongation, % min.
unfolded 4 MD 3 3 5 5 5 5 5 5 5 5
CMD
10 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 18 – 60626-3  IEC:2008+A1:2012
Sheet 111
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (36 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 36 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 36 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 7 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 19 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,12 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
thickness
Laminate
2 ± % 15 15 15 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 150 180 240 300 370 430 490 550 610 730
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
100 135 180 200 270 300 360 400 450 540

CMD
75 100 120 130 180 200 240 255 300 360

Tensile N/10 mm
strength folded
min.
MD
85 100 140 160 210 230 280 300 350 420
CMD
50 60 80 90 120 130 160 175 200 240

Elongation, % min.
unfolded 4 MD 5 5 5 5 5 5 5 5 5 5
CMD
10 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 20 – 60626-3  IEC:2008+A1:2012
Sheet 112
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (50 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 50 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 50 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 8 kV;
– for folded specimens: 6 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 21 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate nominal
2 mm 0,15 0,25 0,30 0,35 0,40 0,45 0,50 0,55
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 200 320 380 440 490 550 620 700
±12 %
grammage
Tensile strength N/10 mm
unfolded min.
MD
135 200 270 310 360 400 450 540
CMD
100 130 180 200 240 255 300 360

Tensile N/10 mm
strength folded
min.
MD
100 160 210 235 280 300 350 420
CMD
60 80 120 130 160 175 200 240
Elongation, % min.
unfolded 4 MD 3 3 3 3 5 5 5 5
CMD
10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 22 – 60626-3  IEC:2008+A1:2012
Sheet 113
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (75 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 75 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal thickness of 75 µm and meets the requirements of
IEC 60674-1 and IEC 60674-3-2.
4 Breakdown voltage requirements
For all laminates listed in Clause 5, the minimum electric breakdown voltage using 6 mm
diameter electrodes is
– for unfolded specimens: 10 kV;
– for folded specimens:  9 kV.
However, in accordance with IEC 60626-2, a minimum electric breakdown voltage on folded
specimens is not required for laminates of nominal thickness greater than 0,5 mm.
5 Additional requirements
Additional requirements are given in the table below.

60626-3  IEC:2008+A1:2012 – 23 –

Property Clause in Units
IEC 60626-2 Tolerance
Laminate
2 mm 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,60
nominal
thickness
Laminate
2 ± % 15 15 10 10 10 10 10 10 10
thickness
tolerance
Laminate
g/m
nominal 3 190 240 310 380 430 510 560 620 740
±12 %
grammage
Tensile N/10 mm
strength min.
MD
140 190 230 280 330 380 420 470 570
unfolded
CMD
105 140 170 210 240 280 310 350 420

Tensile N/10 mm
strength folded 4
min.
MD
100 130 160 200 230 270 300 340 410
CMD
65 90 110 120 130 180 200 220 270

Elongation, % min.
unfolded 4 MD 5 5 5 5 5 5 5 5 5
CMD 10 10 10 10 10 10 10 10 10
NOTES
MD = machine direction
CMD = cross machine direction
min. = minimum
– 24 – 60626-3  IEC:2008+A1:2012
Sheet 114
Requirements for combined flexible triplex materials of three layers –
P-C/F-PET/P-C (100 µm PET film with presspaper or paper)

1 Description
This sheet gives the requirements for triplex materials consisting of paper or presspaper
containing sulphate wood pulp fibres (P-C) laminated on both sides of a polyethylene
terephthalate film (F-PET) having a nominal thickness of 100 µm.
2 Thermal classification
Experience has shown that the combined flexible materials listed in this sheet may be suitable
for use in electrical apparatus with ratings up to and including the range of 120 °C to 130 °C.
3 Single-layer requirements
Use paper which meets the requirements for classes 1.1, 1.2, 1.3, or 1.4 of IEC 60554-1 and
IEC 60554-3. Alternatively, use presspaper which meets the requirements for P2 or P4 of
IEC 60641-1 and IEC 60641-3-2. Each of these presspapers or papers can have a different
density, which will affect the nominal grammage of the laminate.
Use a PET film which has a nominal th
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