IEC 60674-3-7:2023

IEC 60674-3-7
®

Edition 2.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Plastic films for electrical purposes –
Part 3: Specifications for individual materials – Sheet 7: Fluoroethylene-
propylene (FEP) films used for electrical insulation

Films plastiques à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 7: Films de
fluoroéthylène-propylène (FEP) utilisés dans l'isolation électrique
IEC 60674-3-7:2023-08(en-fr)

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---------------------- Page: 2 ----------------------
IEC 60674-3-7

®


Edition 2.0 2023-08




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Plastic films for electrical purposes –

Part 3: Specifications for individual materials – Sheet 7: Fluoroethylene-

propylene (FEP) films used for electrical insulation



Films plastiques à usages électriques –

Partie 3: Spécifications pour matériaux particuliers – Feuille 7: Films de


fluoroéthylène-propylène (FEP) utilisés dans l'isolation électrique












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE





ICS 29.035.20 ISBN 978-2-8322-7402-6




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 60674-3-7:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Classification . 6
5 Designation . 7
6 General requirement . 7
7 Dimensions. 7
7.1 Thickness . 7
7.2 Width . 8
8 Film length/roll diameter . 8
9 Properties . 8
9.1 Properties not dependent on thickness . 8
9.2 Properties dependent on thickness . 9
9.3 Electric strength (AC test) . 9
9.4 Thermal endurance . 10
9.5 Burning characteristics. 10
10 Roll characteristics for all types . 10
10.1 General . 10
10.2 Windability/sag . 10
10.3 Joins . 10
10.4 Difference between the film width and the roll width . 11
10.5 Cores . 11
Bibliography . 12

Table 1 – Nominal thickness and permitted range of thickness . 8
Table 2 – Property not dependent on thickness for all types. 9
Table 3 – Properties dependent on thickness for all types . 9
Table 4 – Electric strength (AC test) for all types . 10
Table 5 – Maximum permissible number of joins per roll . 11
Table 6 – Difference between the film width and the roll width . 11

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IEC 60674-3-7:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

PLASTIC FILMS FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 7: Fluoroethylene-propylene (FEP) films
used for electrical insulation

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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60674-3-7 has been prepared by IEC technical committee 15: Solid electrical insulating
materials. It is an International Standard.
This second edition cancels and replaces the first edition published in 1992. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the title of the standard has been changed to unify the name within the IEC 60674 series;
b) update of the normative references.

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– 4 – IEC 60674-3-7:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
15/980/CDV 15/1002/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60674 series, published under the general title Plastic films for
electrical purposes, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.

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IEC 60674-3-7:2023 © IEC 2023 – 5 –
INTRODUCTION
This document is one of a series which deals with plastic films for electrical purposes. The
series will consist of three parts:
Part 1: Definitions and general requirements (IEC 60674-1);
Part 2: Methods of test (IEC 60674-2);
Part 3: Specifications for individual materials (IEC 60674-3).
This document contains one of the sheets comprising Part 3, as follows:
Sheet 7: Fluoroethylene-propylene (FEP) films used for electrical insulation

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– 6 – IEC 60674-3-7:2023 © IEC 2023
PLASTIC FILMS FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 7: Fluoroethylene-propylene (FEP) films
used for electrical insulation



1 Scope
This sheet of IEC 60674-3 gives the requirements for fluoroethylene-propylene (FEP) films used
for electrical insulation.
Materials which conform to this specification meet established levels of performance. However,
the selection of a material by a user for a specific application can 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 documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IEC 60674-1:1980, Specification for plastic films for electrical purposes – Part 1: Definitions
and general requirements
IEC 60674-2:2016, Specification for plastic films for electrical purposes – Part 2: Methods of
test
IEC 60757, Code for designation of colours
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Classification
The FEP film shall be of the following types:
– Type 1: General purpose;
– Type 2: Surface treated to render the surface(s) heat sealable and cementable;
– Type 2A: One side treated;

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IEC 60674-3-7:2023 © IEC 2023 – 7 –
– Type 2B: Two sides treated.
5 Designation
The plastic film shall be identified by the following designation:

Any colour abbreviation shall comply with IEC 60757, where applicable. Non-standard colours
shall be written out in full.
EXAMPLE: r = regular; nc = natural colour.
6 General requirement
The material shall be a flexible, self-supporting film made from FEP copolymer. Type 2 shall be
surface treated on one or both sides to give heat sealability and cementability.
All types shall conform to the general requirements laid down in IEC 60674-1.
7 Dimensions
7.1 Thickness
The film thickness of Type 1 shall be measured in accordance with the requirements of 4.3.2 of
IEC 60674-2:2016. The thickness of Type 2 shall be measured using a micrometer in
accordance with 4.2.2 of IEC 60674-2:2016.
The overall thickness shall be in accordance with the nominal thickness and the permitted range
of thicknesses given in Table 1.
The following thickness ranges are commonly available:
– Type 1: 12,7 µm to 508 µm;
– Type 2: 12,7 µm to 127 µm.

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– 8 – IEC 60674-3-7:2023 © IEC 2023
Table 1 – Nominal thickness and permitted range of thickness
Type Nominal Overall permitted range of thickness
thickness
 µm
µm Min. Max.
1 and 2 12,7 8,9 16,5
1 and 2 25 18 33
1 and 2 51 38 64
1 and 2 76 57 95
1 and 2 127 102 152
1 190 158 223
1 254 216 292
1 356 320 391
1 508 432 584

7.2 Width
The film width shall be measured in accordance with the requirements of Clause 6 of
IEC 60674-2:2016.
Preferred widths cannot be given on account of the great variety of applications.
The maximum deviation in film width from the nominal shall be ±1,6 mm.
8 Film length/roll diameter
There are no requirements in this document for film lengths or diameters of rolls. These should
be subject to purchase contract.
9 Properties
9.1 Properties not dependent on thickness
See Table 2.

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IEC 60674-3-7:2023 © IEC 2023 – 9 –
Table 2 – Property not dependent on thickness for all types
Property Unit Requirement Test method Remarks
The recommended mixture is 1,3-
3
Density 2 150 ± 20 ISO 1183-2:2019 dibromopropane and ethylene
kg/m
bromide.
Under
Melting point °C ISO 11357-3:2018 DSC method
consideration
Relative permittivity  Use evaporated metal electrodes
IEC 60674-2:2016,
or non-contacting electrodes
)
(18.2.4 of IEC 60674-2:2016 or
18.2
23 °C, 1 kHz – ≤ 2,15
18.2.5 of IEC 60674-2:2016).
Dissipation factor
Use evaporated metal electrodes
23 °C, 48 Hz to 62 Hz ≤ 0,000 4
IEC 60674-2:2016, or non-contacting electrodes
b)
(18.2.4 of IEC 60674-2:2016 or
18.2
23 °C, 1 kHz – ≤ 0,000 3
18.2.5 of IEC 60674-2:2016).
23 °C, 1 MHz ≤ 0,000 6
Volume resistivity
IEC 60674-2:2016,
16
23 °C
≥ 1 × 10
The test voltages are 100 V for
Clause 17
Ω·m
thicknesses > 10 µm and 10 V for
15
170 °C
≥ 1 × 10
thicknesses ≤ 10 µm.
IEC 60674-2:2016,
15
Surface resistivity Ω
≥ 1 × 10
Clause 16

9.2 Properties dependent on thickness
See Table 3.
Table 3 – Properties dependent on thickness for all types
Requirement
IEC 60674-2
:2016
Nominal thickness
Property Unit
µm
Test method
Clause
12,7 25 51 76 508
Tensile strength
a)
MPa
12
Machine direction and
≥ 14 ≥ 17
transverse direction
Elongation at break
a)
% 12
Machine direction and
≥ 125 ≥ 200 ≥ 250
transverse direction
Dimensional change for

shrinkage
% 25
Machine direction and
≤5 ≤ 3 ≤ 2
transverse direction
a)
Rate of extension 50 mm/min, reference lines 100 mm apart.

9.3 Electric strength (AC test)
See Table 4.

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– 10 – IEC 60674-3-7:2023 © IEC 2023
Table 4 – Electric strength (AC test) for all types
Nominal Minimum electric IEC 60674-2:2016
thickness strength Test method
Subclause
µm V/µm
12,7 160 20.1
 Using 6 mm diameter electrodes in air
25 160
51 140
76 120 20.1
127 100 Using 6 mm diameter electrodes in
transformer oil
190 80
254 70
356 65
508 55

9.4 Thermal endurance
There is no requirement for thermal endurance because thermal endurance cannot be
measured in accordance with the requirements of Clause 30 of IEC 60764-2:2016 since the low
melting point (approximately 260 °C to 280 °C) would require low ageing temperatures and
unreasonably long ageing times.
NOTE Experience indicates that these materials are frequently suitable for service at 200 °C.
9.5 Burning characteristics
When determined according to Clause 31 of IEC 60674-2:2016, the classification shall be VTF 0.
10 Roll characteristics for all types
10.1 General
Rolls shall be suitably restrained to prevent unwinding. Material shall be wound evenly and
tightly on the roll to prevent uneven edges or telescoping.
10.2 Windability/sag
No requirement.
10.3 Joins
Where joins (splices) are permitted, their construction shall conform to the requirements given
in 3.3 of IEC 60674-1:1980. Breaks (unjoined pieces) shall also be indicated so as to be clearly
visible when viewed from the end face of the roll.
The number of joins (splices) or breaks in each roll shall not exceed the values given in Table 5.

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IEC 60674-3-7:2023 © IEC 2023 – 11 –
Table 5 – Maximum permissible number of joins per roll
Nominal Roll nominal outer diameter
thickness

Core inner diameter Core inner diameter

76 mm 152 mm
µm < 190 190 > 190 < 241 241 > 241
12,7 - - - 3 4 7
25 2 3 4 2 3 4
51 to190 1 2 3 1 2 3
254 - - - 1 1 3
356 - - - 1 1 1
508 - - - 1 1 2
The minimum distance between joins or splices or between a join and the end of the
roll shall be not less than 30 m for films under 508 µm thickness and 15 m for 508
µm thickness.

10.4 Difference between the film width and the roll width
The film width shall be measured according to Clause 6 of IEC 60674-2:2016. The roll width is
the distance between roll end faces measured between the outermost points of each end face.
The difference between the film width and the roll width shall be according to Table 6.
Table 6 – Difference between the film width and the roll width
Core Roll Requirement
inner diameter outer diameter Maximum difference
mm mm mm
≤ 241 3,2
≤ 77
> 241 6,4
≤ 280 3,2
> 77
> 280 6,4

10.5 Cores
The preferred core inner diameters are 76 mm and 152 mm.

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– 12 – IEC 60674-3-7:2023 © IEC 2023
Bibliography
IEC 60674-3 (all parts), Plastic films for electrical purposes – Part 3: Specifications for
individual materials
ISO 1183-2:2019, Plastics – Methods for determining the density of non-cellular plastics –
Part 2: Density gradient column method
ISO 11357-3:2018, Plastics – Differential scanning calorimetry (DSC) – Part 3: Determination
of temperature and enthalpy of melting and crystallization

___________

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– 14 – IEC 60674-3-7:2023 © IEC 2023
SOMMAIRE
AVANT-PROPOS . 15
INTRODUCTION . 17
1 Domaine d'application . 18
2 Références normatives . 18
3 Termes et définitions . 18
4 Classification . 18
5 Désignation . 19
6 Exigence générale . 19
7 Dimensions. 19
7.1 Épaisseur . 19
7.2 Largeur . 20
8 Longueur de film/diamètres des rouleaux . 20
9 Propriétés . 20
9.1 Propriétés indépendantes de l'épaisseur . 20
9.2 Propriétés dépendantes de l'épaisseur . 21
9.3 Rigidité diélectrique (essai en courant alternatif) . 21
9.4 Endurance thermique . 22
9.5 Caractéristiques de combustion . 22
10 Caractéristiques des rouleaux pour tous les types . 22
10.1 Généralités . 22
10.2 Aptitude à l’enroulement/fléchissement . 22
10.3 Joints . 22
10.4 Différence entre la largeur du film et la largeur du rouleau . 23
10.5 Mandrins . 23
Bibliographie . 24

Tableau 1 – Épaisseurs nominales et plages d'épaisseurs admises . 20
Tableau 2 – Propriétés indépendantes de l'épaisseur pour tous les types . 21
Tableau 3 – Propriétés dépendantes de l'épaisseur pour tous les types . 21
Tableau 4 – Rigidité diélectrique (essai en courant alternatif) pour tous les types . 22
Tableau 5 – Nombre maximal admissible de joints par rouleau . 23
Tableau 6 – Différence entre la largeur du film et la largeur du rouleau. 23

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IEC 60674-3-7:2023 © IEC 2023 – 15 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________

FILMS PLASTIQUES À USAGES ÉLECTRIQUES –

Partie 3: Spécifications pour matériaux particuliers –
Feuille 7: Films de
...