IEC 60674-3-1:2026

• Abstract:

  IEC 60674-3-1:2026 gives the requirements for biaxially oriented polypropylene film having a smooth or rough surface, corona treated when required for vacuum metallization. The films are for use as dielectric in capacitors. 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 third edition includes the following significant technical changes with respect to the previous edition:; a) this document has been completely revised editorially and technically;; b) the ranges of film thickness have been expanded;; c) the requirements of characteristics with the films of expanded thickness have been added.

• Status: Published
• Publication Date: 30-Sep-2026
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: TC 15 - Solid electrical insulating materials
• Drafting Committee: MT 3 - TC 15/MT 3
• Current Stage: PPUB - Publication issued
• Start Date: 01-Oct-2026
• Completion Date: 16-Oct-2026

• Revises: IEC 60674-3-1:2021 - Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented polypropylene (PP) films for capacitors
• Effective Date: 17-Jan-2025

IEC 60674-3-1:2026 is an IEC International Standard for biaxially oriented polypropylene (PP) films used as dielectrics in capacitors. It sets out the film types, preferred dimensions, key physical and electrical properties, and roll-handling requirements for smooth or rough films, including corona-treated versions for vacuum metallization. In practice, it helps suppliers, buyers, and test labs identify the film, test it, and compare it against published performance levels.

What does IEC 60674-3-1:2026 specify?

IEC 60674-3-1:2026 specifies requirements for a particular capacitor film material: biaxially oriented polypropylene film with a smooth or rough surface, with corona treatment where needed for vacuum metallization. The standard is for films used as the dielectric in capacitors, and it is part of the IEC 60674 series on plastic films for electrical purposes.

The document is organized into clauses on scope, normative references, classification, designation, general requirements, dimensions, properties, and roll characteristics. Its tables collect the key performance limits for physical properties, DC electric strength, electrical weak spots, and the permitted number of joins in a roll.

Clause or table	What it covers
Clause 4	Film types and subtypes
Clause 5	Designation format
Clauses 6-7	Material makeup and dimensions
Clause 8 and Tables 1-3	Physical and electrical properties
Clause 9 and Table 4	Roll handling, joins, width, core and labelling

The standard also states that meeting it means meeting established performance levels for the film, but the right material for a capacitor still has to be chosen against the actual application needs.

What are the key requirements of IEC 60674-3-1:2026?

IEC 60674-3-1:2026 combines material identity, test methods, electrical performance and roll quality into one specification. The most important point for a user is that the film is not defined by one property alone - thickness, surface treatment, weak spots, and winding behaviour all matter in production and in capacitor performance.

Classification and designation

Clause 4 divides the film into three main types. Type 1 has smooth surfaces, Type 2 has at least one rough surface, and Type 3 is for thin film with high electric strength when the film thickness is 3,5 μm or less. Each type is split into a, b, and c versions depending on whether the film is not corona treated, pre-treated on one side, or pre-treated on both sides.

Clause 5 gives the designation format: the film is identified by the standard reference, PP, the type, thickness in micrometres, width in millimetres, and length in metres. This matters in purchasing and traceability because it makes the product identity explicit on paperwork and labels.

Material and dimensions

Clause 6 states that the material is to be made essentially from isotactic type polypropylene homopolymer and to conform to IEC 60674-1. Clause 7 then ties dimensions to IEC 60674-2 measurement methods, with different handling for gravimetric thickness and, for Type 2, bulking thickness.

The document gives preferred thickness series for the three types and sets width tolerances, including a separate tolerance for widths above 750 mm. Length and roll diameter are left to the purchase contract, so buyers need to define those items when they matter to winding equipment or packing.

Physical and electrical properties

Clause 8.1 requires the film to satisfy the physical property table, which covers density, melting point, tensile strength, elongation at break, surface resistivity, volume resistivity, dissipation factor, relative permittivity, and dimensional change for shrinkage. Several properties use specific test conditions, including controlled temperature and humidity for resistivity, and particular electrode choices for dissipation factor and relative permittivity.

For a user, this means the film is checked both as a polymer and as an electrical insulation material. The testing shows whether the film can withstand handling, stay dimensionally stable, and perform as an electrical insulator in a capacitor stack.

Electric strength and weak spots

Clause 8.2 specifies DC electric strength testing, including a hold time at 105 °C before measurement and a winding tension requirement. The acceptance criteria vary with nominal film thickness, and the requirement is not just an average value - one of the results in the test set is also limited.

Clause 8.3 addresses electrical weak spots using two alternative methods, C1 and C3, and requires a minimum tested surface area of 5 m². This is important because point defects are a practical cause of capacitor failure, so the film has to be checked over a meaningful area, not just on a small specimen.

Surface treatment and impregnated use

Clause 8.5 applies to the pre-treated film types and sets a minimum wetting tension for the treated surface. That matters for vacuum metallization because the metallized layer depends on how well the surface has been prepared.

Clauses 8.6 to 8.8 cover liquid absorption, compatibility with impregnants, and dissipation factor under impregnated conditions. These are handled by agreement between supplier and purchaser when they are relevant, which reflects real capacitor practice: the impregnant, the test method, and the acceptance limits may depend on the end application.

Roll characteristics

Clause 9 covers how the film is supplied in rolls. Windability is checked by method A or by methods A and B depending on reel width, joins must be constructed and marked properly, edge offset at a join is limited, and the number of joins or breaks per roll is capped in Table 4.

Clause 9 also limits the difference between film width and overall roll width, gives preferred core diameters, and requires the pre-treated side to be identified. For production and incoming inspection, these points matter because they affect unwinding, automatic processing, and correct orientation during metallization or capacitor assembly.

What terms does IEC 60674-3-1:2026 define?

• Biaxially oriented polypropylene (PP) film - A polypropylene film stretched in two directions and specified here for use as capacitor dielectric.
• Type 1 - A smooth-surface film with a space factor below 5 %.
• Type 2 - A film with at least one rough surface and a space factor of 5 % or more.
• Type 3 - A thin film, 3,5 μm thick or less, specified for high electric strength.
• Space factor (SF) - The percentage increase in bulking thickness over gravimetric thickness, linked to surface roughness.
• Wetting tension - A measure used on pre-treated surfaces to check whether the surface is suitable for vacuum metallization.
• Electrical weak spots - Local faults detected by the specified electrical test methods and counted over a defined area.

Who uses IEC 60674-3-1:2026?

IEC 60674-3-1:2026 is used by capacitor film producers, capacitor manufacturers, material suppliers, and test laboratories. It is also used by quality managers and buyers who need to specify film type, thickness, surface treatment, and roll format in procurement.

In practice, these users apply it for product designation, batch release, incoming inspection, metallization preparation, roll acceptance, and supplier-purchaser agreements on impregnated performance. It is especially relevant where the film is part of a capacitor design that depends on electrical strength, low defect content, and consistent winding behaviour.

What changed in IEC 60674-3-1:2026 from the previous edition?

IEC 60674-3-1:2026 cancels and replaces the second edition published in 2021. The edition is described as a technical revision.

The significant changes stated for this edition are:

• the document has been completely revised editorially and technically
• the ranges of film thickness have been expanded
• requirements for characteristics of the expanded thickness range have been added

Which standards are used with IEC 60674-3-1:2026?

• IEC 60674-1:1980 - Provides definitions and general requirements, including thickness tolerance and join construction rules used by this sheet.
• IEC 60674-2:2016 - Provides the test methods used throughout the standard, including thickness, width, resistivity, electric strength, weak spots, windability, wetting tension, space factor, and shrinkage.
• IEC 60674-3 (all sheets) - Gives the Part 3 framework for individual material specifications, of which this sheet is one.
• ISO 1183-2:2019 - Provides the density test method referenced for the physical properties table.
• ISO 11357-3:2018 - Provides the differential scanning calorimetry (DSC) method used for melting point.

What does the IEC 60674-3-1:2026 document contain?

The document contains the classification of PP capacitor films, the designation scheme, general material requirements, dimensional guidance, and the physical and electrical property tables. It also contains test-oriented clauses for DC electric strength, electrical weak spots, wetting tension, liquid absorption, compatibility with impregnants, dissipation factor under impregnated conditions, space factor, and roll characteristics.

Tables 1 to 4 collect the main performance and acceptance data. In use, those tables support product specification, quality control, type evaluation, and supplier acceptance checks, while the clause references show which IEC 60674-2 test method applies to each property.

IEC 60674-3-1 ®
Edition 3.0 2026-10
INTERNATIONAL
STANDARD
REDLINE VERSION
Plastic films for electrical purposes -
Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented
polypropylene (PP) films for capacitors
ICS 29.035.20 ISBN 978-2-8327-1551-2
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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Classification . 5
5 Designation . 6
6 General requirements . 6
7 Dimensions . 6
7.1 Thickness . 6
7.2 Width . 7
7.3 Length/diameter . 7
8 Properties . 7
8.1 Physical properties . 7
8.2 Electric strength (DC test) . 8
8.3 Electrical weak spots . 9
8.4 Thermal endurance . 10
8.5 Wetting tension (types 1b + 1c, 2b + 2c and 3b + 3c only) . 10
8.6 Liquid absorption . 10
8.7 Compatibility with impregnants. 10
8.8 Dissipation factor under impregnated conditions . 11
8.9 Space factor . 11
9 Roll characteristics . 11
9.1 Windability . 11
9.2 Joins . 11
9.3 Roll width (overall width) . 12
9.4 Core . 12
9.5 Labelling . 12
Bibliography . 13

Table 1 – Physical properties . 8
Table 2 – Electric strength (DC test) for types 1, 2 and 3 . 9
Table 3 – Electrical weak spots for types 1, 2 and 3 . 10
Table 4 – Maximum number of joins within a roll (types 1, 2 and 3) . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Plastic films for electrical purposes -
Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented
polypropylene (PP) films for capacitors

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of a patent.
IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect
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held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 60674-3-1:2021. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 60674-3-1 has been prepared by IEC technical committee 15: Solid electrical insulating
materials. It is an International Standard.
This third edition cancels and replaces the second edition published in 2021. 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;
b) the ranges of film thickness have been expanded;
c) the requirements of characteristics with the films of expanded thickness have been added.
The text of this International Standard is based on the following documents:
Draft Report on voting
15/1097/FDIS 15/1106/RVD
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 http://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at http://www.iec.ch/standardsdev/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 http://webstore.iec.ch in the data related to
the specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
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 [1]);
Part 2: Methods of test (IEC 60674-2 [2]);
Part 3: Specifications for individual materials (IEC 60674-3 (all sheets) [3]).
This document contains one of the sheets comprising Part 3, as follows:
Sheet 1: Biaxially oriented (PP) polypropylene films for capacitors.
1 Scope
This sheet of IEC 60674-3 (all sheets) [3] gives the requirements for biaxially oriented
polypropylene film having a smooth or rough surface, corona treated when required for vacuum
metallization. The films are for use as dielectric in capacitors.
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 60674-1, Specification for plastic film for electrical purposes - Part 1: Definitions and
general requirements
IEC 60674-2, Specification for plastic films for electrical purposes -Part 2: Methods of test
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 polypropylene film shall be of the following types:
Type 1: having smooth surfaces (space factor < 5 %, see 8.9);
Type 1a: not corona treated;
Type 1b: one side pre-treated to facilitate the vacuum deposition of metal;
Type 1c: both sides pre-treated.
Type 2: having at least one rough surface (space factor ≥ 5 %, see 8.9);
Type 2a: not corona treated;
Type 2b: one side pre-treated to facilitate the vacuum deposition of metal;
Type 2c: both sides pre-treated.
Type 3: having high electric strength for thin film (film thickness ≤ 3,5 μm);
Type 3a: not corona treated;
Type 3b: one side pre-treated to facilitate the vacuum deposition of metal;
Type 3c: both sides pre-treated.
5 Designation
The plastic film shall be identified by the following designation:
Designation of the film – IEC 60674-3-1 – PP – type – thickness in micrometres – width in
millimetres – length in metres.
EXAMPLE Polypropylene film – IEC 60674-3-1 – PP – 1a – 6 – 100 – 3000.
6 General requirements
The materials shall be made essentially from isotactic type polypropylene homopolymer and
shall conform to the requirements laid down in IEC 60674-1.
7 Dimensions
7.1 Thickness
The film thickness shall be measured in accordance with the requirements of 4.3.2 of IEC
60674-2:2016. This is in general the gravimetric thickness, but for type 2 distinction shall be
made between thickness determined by weighing (t = gravimetric thickness) and thickness
g
measured by micrometer method (t = bulking thickness).
b
Gravimetric thickness shall be measured in accordance with the requirements of 4.3.2 of IEC
60674-2:2016.
Bulking (micrometric) thickness shall be measured according to 4.2.3 of IEC 60674-2:2016.
There are no requirements for thickness in this document, but preferred gravimetric thicknesses
are as follows:
– Type 1: 4,0 μm; 5,0 μm; 6,0 μm; 7,0 μm; 8,0 μm; 10,0 μm; 12,0 μm; 15,0 μm; 18,0 μm; 20,0
μm and 25,0 μm.
– Type 2: 7,4 μm; 9,0 μm; 10,1; 11,0 μm; 12,0 μm; 12,7 μm; 13,6 μm; 14,4 μm; 15,2 μm; 16,2
μm; 17,8 μm; 20 μm; 22,7 μm and 27,3 μm.
– Type 3: 2,0 μm; 2,3 μm; 2,5 μm; 2,8 μm; 3,0 μm and 3,5 μm.
The thickness tolerance shall comply with the requirements of 4.1 of IEC 60674-1:1980 unless
otherwise specified.
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 and different
requirements throughout the capacitor industry.
The tolerance on the width up to 750 mm shall comply with the requirements of 4.2 of IEC
60674-1:1980 . For the width over 750 mm, the tolerance shall be ±4,0 mm.
7.3 Length/diameter
There are no requirements in this document for length or diameters of rolls. These should be
subject to purchase contract.
8 Properties
8.1 Physical properties
See Table 1.
Physical properties shall satisfy the requirements in Table 1.

Table 1 – Physical properties
Property Test method Unit Requirement Remarks
Density ISO 1183–2:2019 [4] 0,91 ± 0,01 This method is only suitable for film
kg/dm
thickness > 12 μm. The
(g/cm )
recommended mixture is
methanol/ethylene glycol
Melting point ISO 11357–3:2018 [5] °C 165 to 175 DSC method
Tensile strength Clause 12 ofIEC MPa Minimum Specimen width (15 ± 3) mm,
(either direction) 60674-2:2016 [6]
Type 1: 120 rate of extension (100 ± 2) mm/min,
and reference lines with the initial
Type 2: 90
grip separation (100 ± 2) mm apart
Type 3: 120
Elongation at
% Minimum
break (either
Type 1: 40
direction)
Type 2: 30
Type 3: 30
Surface resistivity a Ω The test voltages are
≥10
Clause 16 ofIEC
60674-2:2016 [6]
100 V for thicknesses > 10 μm
Volume resistivity a Ωm
>10
and 10 V for thicknesses ≤ 10 μm
Clause 17 ofIEC
60674-2:2016 [6]
Dissipation factor 18.2 or 18.3 of IEC  Use evaporated metal electrodes or
at 23 °C 60674-2:2016 [6] non-contacting electrodes
−4
(18.2.4 or 18.2.5 of IEC 60674-
48 Hz – 62 Hz:
≤3 × 10
2:2016 [6])
−4
1 kHz:
≤3 × 10
Relative 18.2 of IEC 60674- Use evaporated metal electrodes or
permittivity at 2:2016 [6] non-contacting electrodes
23 °C
(18.2.4 or 18.2.5 of IEC 60674-
2:2016 [6])
48 Hz – 62 Hz: 2,2 ± 0,1
1 kHz 2,2 ± 0,1
Dimensional Clause 25 of IEC Shrinkage

change for 60674-2:2016 [6] shall be
shrinkage: agreed
between
– Machine %
supplier and
direction
purchaser
– Transverse %
direction
NOTE Although the potential effects of certain properties such as crystallinity, orientation and isotactic/ atactic
content on the performance of the film are recognized, no recommendations regarding the determination of these
parameters have been made, particularly as no suitable test methods are available in IEC 60674-2.
a
Measurement conditions: (23 ± 2) °C and (50 ± 5) % relative humidity after at least 24 h exposure.
8.2 Electric strength (DC test)
Electric strength shall be measured according to 20.2 of IEC 60674-2:2016 . The sufficient time,
≥ 20 min, shall be allowed for the specimen and electrodes to attain the required temperature,
when the test in 105 °C is performed. The central value shall be not less than the value given
2 2
in Table 2. The winding tension shall be 2,5 N/mm ± 0,5 N/mm .
Table 2 – Electric strength (DC test) for types 1, 2 and 3
Nominal film thickness Type Electric strength Not more than 1 of 21 results
shall be below
(central value)
µm V/µm V/µm
23 °C 105 °C 23 °C 105 °C
2,0 3
2,3
2,5
250 125 150 75
2,8
3,0
3,5
4 1 and 2 120 - 40 -
5 150 - 60 -
6 190 - 80 -
7 and 7,4 230 - 100 -
8 250 - 120 -
9 270 - 145 -
10 and 10,1 290 - 165 -
11 300 - 175 -
12 310 - 185 -
12,7 315 - 195 -
>12,7 to 2527,3 320 - 200 -
8.3 Electrical weak spots
Electrical weak spots shall be measured according to 21.4 of IEC 60674-2:2016.
The number of faults counted shall not exceed the numbers given in Table 3. A minimum surface
area of 5 m is to shall be tested.
Compliance with any one of two method criteria shall constitute compliance with this document.

Table 3 – Electrical weak spots for types 1, 2 and 3
Nominal Type Method C1 Method C3
thickness
(Aluminium foil electrodes) (Metal electrode with air gap)
21.4.2.2 of IEC 60674-2:2016 21.4.2.4 of IEC 60674-2:2016
Fault Test voltage Fault Test voltage
2 2
µm V/µm V/µm
count/m count/m
2,0 3 2,6 250 2,0 200
2,3
2,5
2,8
3,0
3,5
4 1 and 2 2,6 150 1,0 350
5 2,3 0,5 300
6 1,8 300
7 and 7,4 1,7 250
8 1,5 250
9 1,3 230
10 and 10,1 1,2 230
11 1,1 220
≥12 1,0 200
8.4 Thermal endurance
There is no requirement in this document for thermal endurance.
8.5 Wetting tension (types 1b + 1c, 2b + 2c and 3b + 3c only)
When tested in accordance with Clause 11 of IEC 60674-2:2016, the wetting tension of the
−1
tested surface shall not be less than 35 mN·m .
8.6 Liquid absorption
For satisfactory construction of impregnated capacitors, it can be necessary to control the
absorption of the impregnant by the film may need to be controlled within certain limits. If
required, the method of measurement, the time and the temperature used and the absorption
limits shall be agreed between supplier and purchaser .
The preferred method shall conform with Clause 33 of IEC 60674-2:2016.
8.7 Compatibility with impregnants
The compatibility of the film with selected dielectric fluids shall be determined using a method
agreed upon between the supplier and the purchaser. This method may can, for example, be
___________
In view of the wide variety of impregnants available today and under development for capacitor application, no
specific tests and/or limits can be given in this document for liquid absorption (8.6), compatibility with dielectric
fluids (8.7) and dissipation factor under impregnated conditions (8.8).
based on swelling or solubility of the film in the fluid, or on contamination of the fluid or the
film .
8.8 Dissipation factor under impregnated conditions
The impregnants and the methods of testing used throughout the capacitor industry vary widely
and many of the materials and procedures are proprietary. Where the dissipation factor of the
film under impregnated conditions must be to an agreed standard, the limiting values and the
method of measurement should be agreed between supplier and purchaser .
8.9 Space factor
Caused by surface roughness, space factor is the percentage increase in bulking (micrometric)
thickness over gravimetric thickness.
Space factor shall be measured according to Clause 9 of IEC 60674-2:2016.
There are no requirements for space factor in this document but the preferred space factor
value of type 2 is SF = (10 ± 5) %.
9 Roll characteristics
9.1 Windability
The windability shall be measured according to Clause 7 of IEC 60674-2:2016.
Two methods exist:
a) for reels of width less than 150 mm, method A shall be used.
Bias/camber < 10 mm
< 2 mm
Sag (tension 5 MN/m )
b) for reels of width 150 mm and above, method A and method B shall be used.
Bias/camber < 10 mm (Method A)
< 2 mm (Method A)
Sag (tension 5 MN/m )
The extension required to achieve bias/camber and sag limit shall be not more than 0,1 %.
(Method B)
9.2 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 faces of the roll. The offset of either edge at a join shall not
exceed 0,5 mm.
The number of joins (splices) or breaks in each roll shall not exceed the values given in
Table 4.
___________
In view of the wide variety of impregnants available today and under development for capacitor application, no
specific tests and/or limits can be given in this document for liquid absorption (8.6), compatibility with dielectric
fluids (8.7) and dissipation factor under impregnated conditions (8.8).
In view of the wide variety of impregnants available today and under development for capacitor application, no
specific tests and/or limits can be given in this document for liquid absorption (8.6), compatibility with dielectric
fluids (8.7) and dissipation factor under impregnated conditions (8.8).
Table 4 – Maximum number of joins within a roll (types 1, 2 and 3)
Core diameter = 150 mm Core diameter = 38 mm and 76 mm
Nominal film Number of joins within a roll of width >350 Number of joins
thickness mm
Roll width ≤ Roll width >
μm
350 mm 350 mm
Outer diameter Outer diameter <250 ≤ 300 mm
≤ 300 mm > 300 mm > 400 mm
≤ 400 mm ≤ 500 mm
≤ 3,5 1 1 1 1 1
4 3 4 4 3 3
5 2 3 4 3 3
6 2 3 4 2 3
7 and 7,4 2 2 3 2 2
8 2 2 3 2 2
≥ 9 2 2 2 1 1
9.3 Roll width (overall width)
The overall width is the distance between roll end faces measured between the outermost points
of each end face (see 3.2 of IEC 60674-1:1980 [7] ). The difference between the film width
measured according to Clause 6 of IEC 60674-2:2016 and the roll width excluding the core shall
be not greater than:
– 0,5 mm fo
...

IEC 60674-3-1 ®
Edition 3.0 2026-10
INTERNATIONAL
STANDARD
Plastic films for electrical purposes -
Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented
polypropylene (PP) films for capacitors
ICS 29.035.20  ISBN 978-2-8327-1516-1

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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Classification . 5
5 Designation . 6
6 General requirements . 6
7 Dimensions . 6
7.1 Thickness . 6
7.2 Width . 7
7.3 Length/diameter . 7
8 Properties . 7
8.1 Physical properties . 7
8.2 Electric strength (DC test) . 8
8.3 Electrical weak spots . 8
8.4 Thermal endurance . 9
8.5 Wetting tension (types 1b + 1c, 2b + 2c and 3b + 3c only) . 9
8.6 Liquid absorption . 9
8.7 Compatibility with impregnants. 10
8.8 Dissipation factor under impregnated conditions . 10
8.9 Space factor . 10
9 Roll characteristics . 10
9.1 Windability . 10
9.2 Joins . 10
9.3 Roll width (overall width) . 11
9.4 Core . 11
9.5 Labelling . 11
Bibliography . 12

Table 1 – Physical properties . 7
Table 2 – Electric strength (DC test) for types 1, 2 and 3 . 8
Table 3 – Electrical weak spots for types 1, 2 and 3 . 9
Table 4 – Maximum number of joins within a roll (types 1, 2 and 3) . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Plastic films for electrical purposes -
Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented
polypropylene (PP) films for capacitors

FOREWORD
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IEC 60674-3-1 has been prepared by IEC technical committee 15: Solid electrical insulating
materials. It is an International Standard.
This third edition cancels and replaces the second edition published in 2021. 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;
b) the ranges of film thickness have been expanded;
c) the requirements of characteristics with the films of expanded thickness have been added.
The text of this International Standard is based on the following documents:
Draft Report on voting
15/1097/FDIS 15/1106/RVD
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 http://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at http://www.iec.ch/standardsdev/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 http://webstore.iec.ch in the data related to
the specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
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 [1]);
Part 2: Methods of test (IEC 60674-2 [2]);
Part 3: Specifications for individual materials (IEC 60674-3 (all sheets) [3]).
This document contains one of the sheets comprising Part 3, as follows:
Sheet 1: Biaxially oriented (PP) polypropylene films for capacitors.
1 Scope
This sheet of IEC 60674-3 (all sheets) [3] gives the requirements for biaxially oriented
polypropylene film having a smooth or rough surface, corona treated when required for vacuum
metallization. The films are for use as dielectric in capacitors.
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.
...

IEC 60674-3-1 ®
Edition 3.0 2026-10
NORME
INTERNATIONALE
Films plastiques à usages électriques -
Partie 3: Spécifications pour matériaux particuliers - Feuille 1: Films de
polypropylène biorienté (PP) pour condensateurs
ICS 29.035.20  ISBN 978-2-8327-1516-1

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SOMMAIRE
AVANT-PROPOS . 2
INTRODUCTION . 4
1 Domaine d'application . 5
2 Références normatives . 5
3 Termes et définitions . 5
4 Classification . 5
5 Désignation . 6
6 Exigences générales . 6
7 Dimensions . 6
7.1 Épaisseur . 6
7.2 Largeur . 7
7.3 Longueur/diamètre . 7
8 Propriétés . 7
8.1 Propriétés physiques . 7
8.2 Rigidité diélectrique (essai en courant continu) . 8
8.3 Plages électriquement faibles . 9
8.4 Endurance thermique . 9
8.5 Tension de mouillage (types 1b + 1c, 2b + 2c et 3b + 3c seulement) . 9
8.6 Absorption de liquide . 9
8.7 Compatibilité avec les imprégnants . 10
8.8 Facteur de dissipation après imprégnation . 10
8.9 Facteur de remplissage . 10
9 Caractéristiques des rouleaux . 10
9.1 Aptitude à l'enroulement . 10
9.2 Joints . 11
9.3 Largeur des rouleaux (largeur hors tout) . 11
9.4 Mandrin . 11
9.5 Étiquetage . 12
Bibliographie . 13

Tableau 1 – Propriétés physiques . 7
Tableau 2 – Rigidité diélectrique (essai en courant continu) pour les types 1, 2 et 3 . 8
Tableau 3 – Plages électriquement faibles pour les types 1, 2 et 3 . 9
Tableau 4 – Nombre maximal de joints par rouleau (types 1, 2 et 3) . 11

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Films plastiques à usages électriques -
Partie 3: Spécifications pour matériaux particuliers - Feuille 1: Films de
polypropylène biorienté (PP) pour condensateurs

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
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y compris ses experts particuliers et les membres de ses comités d'études et des Comités nationaux de l'IEC,
pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre dommage de quelque
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découlant de la publication ou de l'utilisation de cette Publication de l'IEC ou de toute autre Publication de l'IEC,
ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L'IEC attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation d'un
ou de plusieurs brevets. L'IEC ne prend pas position quant à la preuve, à la validité et à l'applicabilité de tout
droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'IEC n'a pas reçu
notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
d'avertir les responsables de la mise en application du présent document que des informations plus récentes
sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse https://patents.iec.ch.
L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de brevets.
L'IEC 60674-3-1 a été établie par le comité d'études 15 de l'IEC: Matériaux isolants électriques
solides. Il s'agit d'une Norme internationale.
Cette troisième édition annule et remplace la deuxième édition parue en 2021 Cette édition
constitue une révision technique.
Cette édition inclut les modifications techniques significatives suivantes par rapport à l'édition
précédente:
a) le présent document a fait l'objet d'une révision rédactionnelle et technique complète;
b) les plages d'épaisseurs de film ont été étendues;
c) les exigences relatives aux caractéristiques des films d'épaisseur étendue ont été ajoutées.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
15/1097/FDIS 15/1106/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les directives ISO/IEC, Partie 2, il a été développé selon les
directives ISO/IEC, Partie 1 et les directives ISO/IEC, Supplément IEC, disponibles sous
http://www.iec.ch/members_experts/refdocs. Les principaux types de documents développés
par l'IEC sont décrits plus en détail sous https://www.iec.ch/standardsdev/publications.
Une liste de toutes les parties de la série IEC 60674, publiées sous le titre général Films
plastiques à usages électriques, se trouve sur le site web de l'IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous http://webstore.iec.ch dans les données relatives au
document recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
INTRODUCTION
Le présent document fait partie d'une série qui traite des films plastiques à usages électriques.
Cette série est composée de trois parties:
Partie 1: Définitions et prescriptions générales (IEC 60674-1 [1]);
Partie 2: Méthodes d'essai (IEC 60674-2 [2]);
Partie 3: Spécifications pour matériaux particuliers (IEC 60674-3 (toutes les feuilles) [3]).
Le présent document comprend l'une des feuilles qui composent la Partie 3, à savoir:
Feuille 1: Films de polypropylène biorienté (PP) pour condensateurs.
1 Domaine d'application
La présente feuille de l'IEC 60674-3 (toutes les feuilles) [3] donne les exigences relatives aux
films de polypropylène biorienté à surface lisse ou rugueuse, avec traitement par effet
couronne, si cela est exigé, pour la métallisation sous vide. Les films sont utilisés comme
diélectrique dans les condensateurs.
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.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
IEC 60674-1:1980, Spécification pour les films en matière plastique à usages électriques -
Partie 1: Définitions et prescriptions générales
IEC 60674-2:2016, Spécification pour les films en matière plastique à usages électriques -
Partie 2: Méthodes d'essai
IEC
...