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 60674-3-2:2019 gives the requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation. 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.
Keywords: plastic films for electrical purposes, balanced biaxially oriented polyethylene terephthalate (PET) films

Spécification pour les films en matière plastique à usages électriques - Partie 3: Spécifications pour matériaux particuliers - Feuille 2: Exigences pour les films de polyéthylène-téréphtalate (PET), à orientation biaxe équilibrée, utilisés dans l'isolation électrique

IEC 60674-3-2:2019 donne les exigences relatives aux films de polyéthylène-téréphtalate (PET), à orientation biaxe équilibrée, utilisés dans l'isolation électrique. Avertissement de sécurité: Il est de la responsabilité de l’utilisateur de s’assurer que les méthodes présentées ou référencées dans le présent document sont utilisées en toute sécurité.
Mots clés : films en matière plastique à usages électriques, films de polyéthylène-téréphtalate (PET), à orientation biaxe équilibrée

General Information

Status
Published
Publication Date
15-Jan-2019
Current Stage
PPUB - Publication issued
Completion Date
16-Jan-2019
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IEC 60674-3-2:2019 - 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
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IEC 60674-3-2
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Spécification pour les films en matière plastique à usages électriques –

Partie 3: Spécifications pour matériaux particuliers Feuille 2: Exigences pour les

films de polyéthylène-téréphtalate (PET), à orientation biaxe équilibrée, utilisés

dans l'isolation électrique
IEC 60674-3-2:2019-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60674-3-2
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Spécification pour les films en matière plastique à usages électriques –

Partie 3: Spécifications pour matériaux particuliers Feuille 2: Exigences pour les

films de polyéthylène-téréphtalate (PET), à orientation biaxe équilibrée, utilisés

dans l'isolation électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.20 ISBN 978-2-8322-6386-0

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 60674-3-2:2019  IEC:2019
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 requirements ...................................................................................................... 7

7 Dimensions...................................................................................................................... 7

7.1 Thickness ............................................................................................................... 7

7.2 Width ...................................................................................................................... 7

7.3 Roll diameter/film length ......................................................................................... 7

8 Physical properties .......................................................................................................... 8

8.1 Physical properties not dependent on thickness ...................................................... 8

8.2 Physical properties dependent on thickness ............................................................ 8

8.3 Electric strength (AC test) ....................................................................................... 9

8.4 Electric strength (DC test) for type 2 ....................................................................... 9

8.5 Electrical weak spots (type 2 only) ........................................................................ 10

8.6 Thermal endurance ............................................................................................... 11

8.7 Temperature and hydrolysis resistance ................................................................. 11

9 Roll characteristics for all types ..................................................................................... 11

9.1 Windability (bias/camber and sag) ........................................................................ 11

9.2 Joins ..................................................................................................................... 12

9.3 Difference between the film width and the roll width .............................................. 12

9.4 Cores .................................................................................................................... 12

Bibliography .......................................................................................................................... 13

Table 1 – Physical properties not dependent on thickness ...................................................... 8

Table 2 – Physical properties dependent on thickness for types 1, 3, 4 and 5 ......................... 8

Table 3 – Physical properties dependent on thickness for type 2 ............................................ 9

Table 4 – Electric strength (AC test) for all types .................................................................... 9

Table 5 – Electric strength (DC test) type 2 only ................................................................... 10

Table 6 – Number of faults counted (type 2 only) .................................................................. 10

Table 7 – Thermal endurance ............................................................................................... 11

Table 8 – Temperature and hydrolysis resistance ................................................................. 11

Table 9 – Windability ............................................................................................................ 11

---------------------- Page: 4 ----------------------
IEC 60674-3-2:2019  IEC:2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
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

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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.

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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 60674-3-2 has been prepared by IEC technical committee 15:

Solid electrical insulating materials.

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) 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 60674-3-2:2019  IEC:2019
The text of this International Standard is based on the following documents:
CDV Report on voting
15/840/CDV 15/865/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60674 series, published under the general title Specification for

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 "http://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 60674-3-2:2019  IEC:2019 – 5 –
INTRODUCTION

This standard is one of a series which deals with plastic films for electrical purposes.

The series 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)
---------------------- Page: 7 ----------------------
– 6 – IEC 60674-3-2:2019  IEC:2019
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
1 Scope

This sheet of IEC 60674-3 gives the requirements for balanced biaxially oriented polyethylene

terephthalate (PET) films used for electrical insulation.

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 60068-2-67, Environmental testing – Part 2-67: Tests – Test Cy: Damp heat, steady state,

accelerated test primarily intended for components

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 60674-2/AMD1:–
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Classification
The PET film shall be of the following types:
– Type 1: Standard
– Type 2: Ultra thin with high electric strength
– Type 3: High temperature resistance
– Type 4: High temperature and hydrolysis resistance
– Type 5: High temperature and hydrolysis resistance higher than type 4
Main applications of each type are as follows:
—————————

Under preparation. Stage at the time of publication: IEC/APUB 60674-2/AMD1:2018.

---------------------- Page: 8 ----------------------
IEC 60674-3-2:2019  IEC:2019 – 7 –
– Type 1: General
– Type 2: For use as the dielectric of capacitors
– Type 3: For use as the insulation of electrical windings

– Type 4 and 5: For use as the insulation of electrical windings, and back sheet of

photovoltaic modules
5 Designation
The plastic film shall be identified by the following designation:

Designation of the film – IEC 60674-3-2 – PET – type – thickness in micrometres – width in

millimetres – length in metres – colour.
Example:

Polyethylene terephthalate – IEC 60674-3-2 – PET – type 1 – 100 – 20 – 200 – nc (nc = natural colour; other

colours according to IEC 60757).
6 General requirements

The material shall be made from polyethylene terephthalate; it shall be biaxially oriented with

an approximately balanced orientation and shall conform to the requirements laid down in

IEC 60674-1.

For certain applications, additives to the base material may be present (e.g. pigments, dyes).

Where such additives are included, they shall not affect the requirements for any of the

properties listed for that type unless otherwise specified.
7 Dimensions
7.1 Thickness

The film thickness shall be measured by a gravimetric method according to 4.3.2 of

IEC 60674-2:2016.

There are no requirements for thickness in this document but preferred thickness ranges are

as follows:
– Type 1: 12 µm – 500 µm
– Type 2: 0,7 µm – 23 µm
– Type 3: 50 µm – 500 µm
– Type 4: 50 µm – 500 µm
– Type 5; 50 µm – 350 µm

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 according to 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 of 4.2 of IEC 60674-1:1980

0,0

except for slot closure applications where on a width of less than 25 mm, a tolerance of

−0,3
mm is specified as an alternative.
7.3 Roll diameter/film length

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

should be subject to contract.
---------------------- Page: 9 ----------------------
– 8 – IEC 60674-3-2:2019  IEC:2019
8 Physical properties
8.1 Physical properties not dependent on thickness
See Table 1.
Table 1 – Physical properties not dependent on thickness
IEC 60674-2:2016
Property Requirements Units Test method Type
Clause/Subclause
Density - normal 1 390 ± 10
a)
5, Method D All
kg/m
Density – for opaque
1 420 ± 70
pigmented film
Melting- point 260 ± 7 1 and 3
255 ± 5 °C 24 2
260 + 7, − 10 4 and 5
Permittivity 3,3 ± 0,2 – All
18.2 (23 °C, 1 kHz)
–3 b)
Dissipation factor – All
≤ 3 × 10 18.2 (23 °C, 48 Hz – 62 Hz)
–3 2)
≤ 6 × 10 – All
18.2 (23 °C, 1 kHz)
Volume resistivity ≥ 10 1, 3, 4 and 5
Ω × m
≥ 10 2
Surface resistivity 1, 3, 4 and 5
≥ 10
Ω 16
≥ 10
This method is only suitable for film thicknesses above 12 µm.
Use non-contacting electrodes or evaporated metal electrodes.

Measurement conditions shall be (23 ± 2) °C and (50 ± 5) % RH after 24 h exposure. The test voltages are

100 V for thicknesses > 10 µm and 10 V for thicknesses ≤ 10 µm.
8.2 Physical properties dependent on thickness
See Tables 2 and 3.
Table 2 – Physical properties dependent on thickness for types 1, 3, 4 and 5
Requirements
IEC 60674-2:2016
Property Units Test method
≥ 12 µm > 15 µm > 100 µm > 250 µm > 350 µm
Clause
≤ 15 µm ≤ 100 µm ≤ 250 µm ≤ 350 µm
Tensile strength
a)
≥ 170 ≥ 150 ≥ 140 ≥ 110 ≥ 90 MPa
(either direction)
Elongation at break
a)
≥ 50 ≥ 80 ≥ 80 ≥ 80 ≥ 100 %
(either direction)
Dimensional change
for shrinkage ≤ 3,5 ≤ 3,0 ≤ 3,0 ≤ 2,0 ≤ 2,0 % 25 (150 °C, 15 min)
(either direction)
Rate of extension 100 mm/min, reference lines 100 mm apart.
---------------------- Page: 10 ----------------------
IEC 60674-3-2:2019  IEC:2019 – 9 –
Table 3 – Physical properties dependent on thickness for type 2
Requirements
IEC 60674- 2:2016
Property Units Test method
≥ 0,7 µm > 1,5 µm > 2,0 µm > 4 µm > 15 µm
Subclause
≤ 23 µm
≤ 1,5 µm ≤ 2,0 µm ≤ 4,0 µm ≤ 15 µm
Tensile strength
a)
≥ 135 ≥ 155 ≥ 170 ≥ 170 ≥ 150 MPa 12
(either direction)
Elongation at break
a)
≥ 20 ≥ 30 ≥ 40 ≥ 50 ≥ 80 %
(either direction)
Dimensional change
for shrinkage
% 25 (150 °C, 15 min)
Machine direction ≤ 3,5 ≤ 3,5 ≤ 3,5 ≤ 3,5 ≤ 3,5
Transverse direction ≤ 2,0 ≤ 2,0 ≤ 2,0 ≤ 2,0 ≤ 2,0
Rate of extension 100 mm/min, reference lines 100 mm apart.
8.3 Electric strength (AC test)

Electric strength under AC voltage given in Table 4 shall be measured according to 20.1 of

IEC 60674-2:2016. The electrode shall be selected from the following configurations:

– unequal electrodes;
– sphere and plate electrodes;
– 6 mm diameter rod and rod electrodes.
Table 4 – Electric strength (AC test) for all types
Nominal Electric strength IEC 60674-2:2016
thickness (median) Test method
µm V/µm Subclause
12 ≥ 208 20.1 in air
15 ≥ 200
19 ≥ 190
23 ≥ 174
36 ≥ 150
50 ≥ 130
75 ≥ 105
100 ≥ 90
125 ≥ 80 20.1 in transformer
oil or in air
190 ≥ 65
250 ≥ 60
350 ≥ 50
500 ≥ 35
8.4 Electric strength (DC test) for type 2

Electric strength under DC voltage given in Table 5 shall be tested by one of the following

methods:
– wound capacitor method according to 20.2 of IEC 60674-2:2016;
– 6 mm diameter electrodes method according to 20.1 of IEC 60674-2:2016;
– Aluminium foils sandwich method according to 20.3 of IEC 60674-2/AMD1:–.
---------------------- Page: 11 ----------------------
– 10 – IEC 60674-3-2:2019  IEC:2019
Table 5 – Electric strength (DC test) type 2 only
6 mm diameter Aluminium foils
Wound capacitor method
electrodes method sandwich method
20.1 of IEC 60674- 20.3 of IEC 60674-
20.2 of IEC 60674-2:2016
Nominal 2:2016 2/AMD1:–
thickness
Breakdown Not more than Not more than Electric strength Electric strength
voltage two of the 21 one of the 21
(Median) (Median)
results shall results shall
(Median)
be below be below
µm V (V/µm) V V V/µm V/µm
≥ 0,7 < 1,4 – – – ≥ 200 ≥ 100
≥ 1,4 < 2,0 – – – ≥ 250 ≥ 120
≥ 2,0 < 3,0 – – – ≥ 290 ≥ 130
≥ 3,0 < 4,0 – – – ≥ 330 ≥ 170
≥ 4,0 < 5,0 – – – ≥ 370 ≥ 200
≥ 5,0 < 6,0 – – – ≥ 370 ≥ 225
6 ≥ 1 500 (250) 600 400 ≥ 370 ≥ 250
8 ≥ 2 000 (250) 1 100 550 ≥ 370 –
10 ≥ 2 400 (240) 1 500 800 ≥ 370 –
12 ≥ 2 800 (233) 1 800 1 000 ≥ 370 –
15 ≥ 3 200 (213) 2 000 1 600 ≥ 370 –
19 ≥ 3 400 (179) 2 200 1 900 – –
23 ≥ 4 000 (174) 2 500 2 200 – –

It should be confirmed before every event of the measurement that electrode surfaces of

6 mm diameter are mirror surface having free from damage, and the centres of the two

electrode rods are set in a straight line.
8.5 Electrical weak spots (type 2 only)

When measured according to 21.4 of IEC 60674-2:2016, the number of faults counted shall

not exceed the numbers given in Table 6. A minimum surface area of 5 m is to be tested.

Compliance with any one of three method criteria shall constitute compliance with this

document.
Table 6 – Number of faults counted (type 2 only)
Nominal Method C1 Method C2 Method C3
thickness

(Aluminium foil electrodes) (Metalized film electrode) (Metal electrode with air gap)

21.4.2.2 of IEC 60674-2:2016 21.4.2.3 of IEC 60674-2:2016 21.4.2.4 of IEC 60674-2:2016

Fault Test voltage Fault Test voltage Fault Test voltage
2 2 2
µm count/m V/µm count/m V/µm count/m V/µm
≥ 0,9 < 2,5 – – ≤ 6 100 – –
2,5 – – ≤ 3 150 – –
3 ≤ 6 200 ≤ 3 150 ≤ 5 250
3,5 ≤ 4 200 ≤ 3 150 ≤ 3 250
5 ≤ 2 200 ≤ 2 150 ≤ 1 250
6 ≤ 1 200 ≤ 1,5 150 ≤ 0,5 250
8 ≤ 0,8 200 ≤ 1,5 150 ≤ 0,4 250
10 ≤ 0,4 200 ≤ 1,2 150 ≤ 0,2 250
≥ 12 ≤ 0,2 200 ≤ 1,0 150 ≤ 0,1 250
---------------------- Page: 12 ----------------------
IEC 60674-3-2:2019  IEC:2019 – 11 –
8.6 Thermal endurance

Thermal endurance given in Table 7 shall be measured according to Clause 30 of IEC 60674-

2:2016.

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

Table 7 – Thermal endurance
Type TI
1 ≥ 115
2 Not applicable
3, 4 and 5 ≥ 125

The water content of the surrounding air of the ageing oven during the ageing process shall

3 3
to 12,7 g/m , equivalent to (50 ± 5) % RH at (23 ± 2) °C.
be in the range of 8,3 g/m
Ageing temperature of 140 °C, 160 °C and 180 °C are recommended.

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

composition or method of production of the material.
8.7 Temperature and hydrolysis resistance

Temperature and hydrolysis resistance given in Table 8 shall be measured as the time the

elongation at break decreases to 10 % under exposure to damp heat (steady state), 85 °C,

85 % RH according to IEC 60068-2-67.
Table 8 – Temperature and hydrolysis resistance
Time the elongation at
Type
break decreases to 10 %
1 ≥ 1 700 h
2 not applicable
3 ≥ 1 700 h
4 ≥ 2 500 h
5 ≥ 4 000 h
9 Roll characteristics for all types
9.1 Windability (bias/camber and sag)

Windability given in Table 9 shall be measured according to Clause 7 of IEC 60674-2:2016.

For films of width less than 150 mm, method A shall be used.
Table 9 – Windability
Characteristic Type 1, 3, 4 and 5 Type 2
Bias/camber ≤ 10 mm ≤ 10 mm
Sag (tension 5 MN/m ) ≤ 5 mm ≤ 2 mm
For films of width 150 mm and above, method B shall be used.

The extension required to achieve bias/camber and sag limit shall be not more than 0,1 %.

This requirement does not apply to thicknesses greater than 36 µm for which there are no

requirements.
---------------------- Page: 13 ----------------------
– 12 – IEC 60674-3-2:2019  IEC:2019
9.2 Joins

Where joins (splices) are permitted, their constructions 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 faces of the roll. The offset of either edge at a join

shall not exceed 0,5 mm.

There are no requirements in this document for the number of joins (splices) or breaks of rolls.

These should be subject to purchase contract.
9.3 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. There are no requirements in this document for the difference between the film

width and the overall roll width. These should be subject to purchase contract.
9.4 Cores
The preferred inner diameters of cores are 76 mm and 152 mm.
---------------------- Page: 14 ----------------------
IEC 60674-3-2:2019  IEC:2019 – 13 –
Bibliography
IEC 60757, Code for designation of colours
_____________
---------------------- Page: 15 ----------------------
– 14 – IEC 60674-3-2:2019  IEC:2019
SOMMAIRE
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