Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheets 4: Polyimide films used for electrical insulation

IEC 60674-3-4:2022 gives the requirements for polyimide films used for electrical purposes. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application is 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. This second edition cancels and replaces the first edition published in 1993. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:  
this document has been completely revised editorially and technically and included in the IEC 60674 series of standards;
new types have been included;
the ranges of thickness have been expanded;
changes have been made to the requirements of some existing types.

Films plastiques à usages électriques - Partie 3: Spécifications pour matériaux particuliers - Feuille 4: Films de polyimide utilisés dans l'isolation électrique

IEC 60674-3-4:2022 spécifie les exigences pour les films de polyimide à usages électriques. Les matériaux conformes à la présente spécification satisfont à des niveaux établis de performance. Toutefois, le choix d’un matériau par un utilisateur pour une application spécifique repose sur les exigences réelles nécessaires pour obtenir des performances adéquates de l’application concernée, et non sur la seule présente spécification. Avertissement de sécurité: il incombe à l'utilisateur des méthodes contenues ou référencées dans le présent document de s'assurer que celles-ci sont utilisées en toute sécurité. Cette deuxième édition annule et remplace la première édition parue en 1993. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
le présent document a fait l'objet d'une révision rédactionnelle et technique complète, et a été intégré à la série de normes IEC 60674;
de nouveaux types ont été ajoutés;
les plages d'épaisseurs ont été étendues;
des modifications ont été apportées aux exigences relatives à certains types existants.

General Information

Status
Published
Publication Date
21-Jun-2022
Current Stage
PPUB - Publication issued
Completion Date
22-Jun-2022
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IEC 60674-3-4
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plastic films for electrical purposes –

Part 3: Specifications for individual materials – Sheet 4: Polyimide films used for

electrical insulation
Films plastiques à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 4: Films de
polyimide utilisés dans l'isolation électrique
IEC 60674-3-4:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60674-3-4
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plastic films for electrical purposes –
Part 3: Specifications for individual materials – Sheet 4: Polyimide films used
for electrical insulation
Films plastiques à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 4: Films de
polyimide utilisés dans l'isolation électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.20 ISBN 978-2-8322-3921-6

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60674-3-4:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Classification ................................................................................................................... 7

5 Designation ..................................................................................................................... 7

6 General requirements ...................................................................................................... 7

7 Dimensions...................................................................................................................... 8

7.1 Thickness ............................................................................................................... 8

7.2 Width ...................................................................................................................... 8

8 Properties ........................................................................................................................ 8

8.1 Properties not dependent on thickness ................................................................... 8

8.2 Properties dependent on thickness ......................................................................... 9

9 Other properties ............................................................................................................ 10

9.1 Thermal endurance ............................................................................................... 10

9.2 Burning characteristics.......................................................................................... 11

10 Roll characteristics ........................................................................................................ 11

10.1 Roll diameter/film length ....................................................................................... 11

10.2 Windability/sag ..................................................................................................... 11

10.3 Joins ..................................................................................................................... 12

10.4 Difference between the film width and the roll width .............................................. 13

10.5 Cores .................................................................................................................... 13

Bibliography .......................................................................................................................... 14

Table 1 – Tolerance on the width ............................................................................................ 8

Table 2 – Properties not dependent on thickness .................................................................... 9

Table 3 – Properties dependent on thickness ........................................................................ 10

Table 4 – Thermal endurance ............................................................................................... 11

Table 5 – Windability/sag ...................................................................................................... 11

Table 6 – Maximum permissible number of joins per roll ....................................................... 12

Table 7 – Minimum permissible distance between splices or between any splice and

the end of the roll (m) ........................................................................................................... 13

Table 8 – Difference between the film width and the roll width .............................................. 13

---------------------- Page: 4 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PLASTIC FILMS FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 4: Polyimide 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,

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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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6) All users should ensure that they have the latest edition of this publication.

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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.

IEC 60674-3-4 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 1993. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) this document has been completely revised editorially and technically and included in the

IEC 60674 series of standards;
b) new types have been included;
c) the ranges of thickness have been expanded;
d) changes have been made to the requirements of some existing types.
---------------------- Page: 5 ----------------------
– 4 – IEC 60674-3-4:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
15/956/CDV 15/971/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.

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,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 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.
This document contains one of the sheets comprising Part 3, as follows:
Sheet 4: Polyimide films used for electrical insulation
---------------------- Page: 7 ----------------------
– 6 – IEC 60674-3-4:2022 © IEC 2022
PLASTIC FILMS FOR ELECTRICAL PURPOSES –
Part 3: Specifications for individual materials –
Sheet 4: Polyimide films used for electrical insulation
1 Scope

This sheet of IEC 60674-3 gives the requirements for polyimide films used for electrical

purposes.

Materials which conform to this specification meet established levels of performance. However,

the selection of a material by a user for a specific application is 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

ISO 9773, Plastics – Determination of burning behaviour of thin flexible vertical specimens in

contact with a small-flame ignition source
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
---------------------- Page: 8 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 7 –
4 Classification
This document contains three of the groups comprising Part 3 as follows:

a) Group A: Polyimide films based on poly(N,N’-p,p’-oxidiphenylene pyromellitimide) used for

electrical insulation.
For this Group A, the following types shall be applied:
– Type 1: General purpose
– Type 2a: One side FEP coated (heat sealable)
– Type 2b: Two side FEP coated (heat sealable)
– Type 3a: Dimensionally stabilized (low shrinkage)
– Type 3b: Dimensionally stabilized (low CTE (Coefficient of Thermal Expansion))
– Type 4: Heat shrinkable (withdrawn; formally used in IEC 60674-3-4:1993)
– Type 5: Corona resistant (under consideration)

b) Group B: Polyimide films based on poly(N,N’-p,phenylenebiphenyl tetracarboxyl imide) used

for electrical insulation.
No assigned by type for this Group B
c) Group C: Polyimide films based on poly(N,N’-p,p-oxidiphenylene biphenyl-
tetracarboxylimide) used for electrical insulation.
No assigned by type for this Group C.
5 Designation
The plastic film shall be identified by the following designation:

Designation of the film – IEC 60674-3-4 – PI Group– type – thickness in micrometres – width in

millimetres – length in metres – colour.
EXAMPLE:
Polyimide film – IEC 60674-3-4 – PI Group A– type 1 – 100 – 20 – 200 – nc
(nc = natural colour; other colours according to IEC 60757).
6 General requirements

The material shall be made from polyimide polymer and shall conform to the requirements laid

down in IEC 60674-1.

– Group A – Type 1 material shall be a flexible, self-supporting film made from polyimide

polymer.

– Group A – Type 2a and Type 2b shall have a heat sealable coating of fluoroethylene-

propylene (FEP) resin on one or both sides of type 1 material.

– Group A – Type 3a and Type 3b shall be identical to Group A – type 1 except for dimensional

stability with improved low shrinkage and improved low CTE, respectively.

– Group A – type 5 shall be a flexible, self-supporting film made from polyimide polymer using

fillers for an upgraded lifetime under presence of corona discharges.
---------------------- Page: 9 ----------------------
– 8 – IEC 60674-3-4:2022 © IEC 2022
7 Dimensions
7.1 Thickness

The film thickness shall be measured by a roll in accordance with the requirements of 4.3.2 of

IEC 60674-2:2016. The mechanical scanning method (4.2.2 of IEC 60674-2:2016) could be

used when required.

There are no requirements for thickness in this document, but preferred thicknesses in μm are

as follows:
5; 7,5; 10; 12,5; 20; 25; 37,5; 50; 75; 100; 125; 150; 175.

The thickness tolerance shall comply with the requirements in 4.1 of IEC 60674-1:1980 unless

otherwise specified in the purchase contract.
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 tolerance on the width shall comply with the requirements on Table 1.
Table 1 – Tolerance on the width
Width Tolerance
mm mm
≤ 50 ± 0,5
> 50, ≤ 300 ± 1,0
> 300, ≤ 450 ± 2,0
> 450, ≤ 1 500 ± 4,0
> 1 500
Specified in the purchase contract
8 Properties
8.1 Properties not dependent on thickness

Properties which are not dependent on thickness shall comply with the requirements on Table 2.

---------------------- Page: 10 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 9 –
Table 2 – Properties not dependent on thickness
Requirements
IEC 60674-2:2016
Test method
Group A
Property Units
Clause
d d
Group B Group C
(conditions)
Type
Density
1 435 ± 20 all types 1 480 ± 10 1 390 ± 10 kg/m ISO 1183-2:2019
Melting point Does not all types Does not Does not ISO 11357-3
melt melt melt
Relative
18.2
Permittivity
3,6 ± 0,4 3,4 ± 0,4 3,4 ± 0,4 (23 °C, 1 kHz)
all types –
3,6 ± 0,4 3,4 ± 0,4 3,4 ± 0,4 (23 °C, 1 MHz)
Dissipation factor
18.2
−3 −3 −3
(23 °C, 1 kHz)
≤ 7 × 10 ≤ 7 × 10 ≤ 7 × 10
all types –
−3 −3 −3
(23 °C, 1 MHz)
≤ 7 × 10 ≤ 7 × 10 ≤ 7 × 10
14 14 14
Volume resistivity
≥ 10 all types ≥ 10 ≥ 10 Ω·m 17.1
14 14 14
Surface resistivity all types Ω 16
≥ 10 ≥ 10 ≥ 10
Dimensional
change
≤ 0,35 1, 2a, 2b, 25
(shrinkage in MD
≤ 0,15 ≤ 0,15 %
and TD)
≤ 0,15 3a, 3b (200 °C, 15 min)
CLTE (Coefficient
of Linear Thermal
Expansion) ≤ 40 1, 2a, 2b, ISO 11359-2
≤ 25 – ppm/ °C
≤ 25 3a, 3b (100 °C – 200 °C)
Water absorption 32.3.2,
≤ 3,0 all types ≤ 2,0 ≤ 2,0 %
(6 h)
Use non-contacting electrodes or evaporated metal electrodes.
MD: machine direction, TD: transverse direction.
The films in Group A is assigned by type.
The films in Group B and Group C are not assigned by type.

The film is dried at 110 °C, and placed in an atmosphere of 93 % ± 2 % r.h. for 6 h

8.2 Properties dependent on thickness

Properties which are dependent on thickness shall comply with the requirements on Table 3.

---------------------- Page: 11 ----------------------
– 10 – IEC 60674-3-4:2022 © IEC 2022
Table 3 – Properties dependent on thickness
Nominal thickness IEC6067
2:2016 Applica-
Property Units
Test bility
method
5 7,5 12,5 25 50 75 125 150 175
Clause
Group A
− − 140 160 160 160 160 110 110 Type 1
− − Type 2a
Tensile strength
Type 2b
(either
MPa 12
direction)
140 160 160 160 160 Type 3a
Minimum value
100 120 140 160 160 160 160 Type 3b
− 294 294 294 294 294 294 - Group B
− 196 196 196 196 196 196 Group C
Group A
− − 60 60 60 60 60 60 60 Type 1
Elongation at
− − Type 2a
break
Type 2b
(either %
20 30 30 30 30 30 30 Type 3a
direction)
40 40 40 40 40 Type 3b
Minimum value
− 25 25 25 25 25 25 Group B
− 80 80 80 80 80 80 Group C
Group A
− − 235 235 195 175 120 110 110 Type 1
− − Type 2a
Electric strength
(AC test)
Type 2b
V/µm 20.1
48 Hz to 62 Hz
235 235 195 175 120 Type 3a
Minimum value
235 235 235 235 195 175 120 Type 3b
− 200 200 200 180 130 100 Group B
− 200 200 200 195 135 110 Group C
The dash” −” indicates that these sizes are not generally available.
Rate of extension is 50 mm/min, reference lines are 100 mm apart.
9 Other properties
9.1 Thermal endurance

The temperature indexes for thermal endurance shall comply with the values on Table 4.

---------------------- Page: 12 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 11 –
Table 4 – Thermal endurance
IEC 60674-2:2016
Temperature Recommended ageing
Applicability Test method,
index
temperatures
Clause
°C
Group A ≥ 200 275, 300 and 325
Group B ≥ 290
300, 325 and 350
Group C ≥ 270

The end point criterion shall be 50 % retention of the original tensile strength value.

b 3

The water content of the air in the ageing oven during the ageing process shall be in the range of 9,5 g/m to

12,5 g/m , equivalent to 50 % ± 5 % relative humidity at (23 ± 2) °C.

This test need not be repeated unless the manufacturer has made a significant change in the

composition or method of production of the material.
9.2 Burning characteristics

When determined according to Clause 31 of IEC 60674-2:2016, the classification shall be VTF 0,

or when ISO 9773 is used, the classification shall be VTM-0.
10 Roll characteristics
10.1 Roll diameter/film length

There are no requirements in this document for roll diameters or film lengths on a roll. These

are subject to contract between manufacturer and purchaser.
10.2 Windability/sag
See Table 5.
Table 5 – Windability/sag
IEC 60674-2:2016
Applicability Film width Film thickness Sag requirements Test method
Subclause
mm µm
< 25 No requirement 7.3 Method A
< 300
≥ 25
At a tension of 2,8 MN/m
≥ 300 < 25 ≤ 19 mm
Group A
Group B < 450 ≥ 25
Group C
≥ 450 < 25
≤ 25 mm
< 1 500 ≥ 25
≥ 1 500
specified in the purchase contract
---------------------- Page: 13 ----------------------
– 12 – IEC 60674-3-4:2022 © IEC 2022
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 6.

And also, a distance between splices or between any splice and the end of the roll shall not be

below the values given in Table 7.
Table 6 – Maximum permissible number of joins per roll
Roll dimensions Applicability Nominal thickness
mm µm
Core ID Roll OD 5 7,5 12,5 25 50 75 125 150 175
76 124 Group A − − − − − −
Groups B and C 4 − − − − −
76 152 Group A − 5 2 1 1 1 1 1
Groups B and C − 4 2 1 1 −
76 241 Group A − − 7 5 4 4 3 3
Groups B and C − − 5 4 3 3
152 241 Group A 30 11 5 4 3 3 3 3
a a
Groups B and C 3 2 2 2
152 280 Group A − − 7 5 4 4 3 3
a a
Groups B and C 5 4 3 3
152 356 Group A − − − 11 19 9 8 8
Groups B and C − − − 7 15 5
The dash ”−” indicates that these sizes are not generally available.
Maximum number of joins 5/1 000 m.
---------------------- Page: 14 ----------------------
IEC 60674-3-4:2022 © IEC 2022 – 13 –
Table 7 – Minimum permissible distance between splices or between
any splice and the end of the roll (m)
Roll dimensions Applicability Nominal thickness
mm µm
Core ID Roll OD 5 7,5 12,5 25 50 75 125 150 175
76 124 Group A − − − − − − - -
Groups B and C − − − − − − - -
76 152 Group A − 30 30 30 30 22 22 22
Groups B and C − 50 150 30 30 30
76 241 Group A − − 30 30 30 22 22 22
Groups B and C − − 150 30 30 30
152 241 Group A − 30 30 30 30 22 22 22
a a
Groups B and C 150 30 30 30
152 280 Group A − 30 30 30 30 22 22 22
a a
Groups B and C 150 30 30 30
152 356 Group A − − − 30 30 22 22 22
Groups B and C − − − 30 30 30
The dash ”−” indicates that these sizes are not generally available.
Minimum distance 50 m in 1 000 m.
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 overall 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 8.

Table 8 – Difference between the film width and the roll width
Core ID ≤ 77 mm Core ID > 77 mm
Roll outer diameter Roll outer diameter
≤ 241 > 241 ≤ 280 > 280
3,2 6,4 3,2 6,4
10.5 Cores
Preferred core inside diameters are 76 mm and 152 mm.
---------------------- Page: 15 ----------------------
– 14 – IEC 60674-3-4:2022 © IEC 2022
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

ISO 11359-2, Plastics – Thermomechanical analysis (TMA) – Part 2: Determination of

coefficient of linear thermal expansion and glass transition temperature
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SOMMAIRE

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