FprEN IEC 60674-3-1:2026

• Status: Not Published
• Publication Date: 12-Nov-2026
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: CLC/SR 15 - Insulating materials
• Current Stage: 5060 - Voting results sent to TC, SR - Formal Approval
• Start Date: 28-Aug-2026
• Completion Date: 28-Aug-2026
• Ref Project: kSIST FprEN IEC 60674-3-1:2026 - Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented polypropylene (PP) films for capacitors

• Revises: EN IEC 60674-3-1:2021 - Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented polypropylene (PP) film for capacitors
• Effective Date: 21-Jan-2025

FprEN IEC 60674-3-1:2026 is a CLC draft of an IEC specification for biaxially oriented polypropylene (PP) films for capacitors. It specifies the material, dimensional, electrical, and roll-performance requirements for films used as dielectric in capacitors, so manufacturers, suppliers, test labs, and capacitor buyers can specify and check the film in a consistent way.

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

FprEN IEC 60674-3-1:2026 covers biaxially oriented polypropylene film with smooth or rough surfaces, including material that is corona treated when needed for vacuum metallization. The document is organized into clauses on scope, normative references, terms and definitions, classification, designation, general requirements, dimensions, properties, and roll characteristics, followed by a bibliography.

The structure matters in practice because it separates how the film is identified from how it is measured and accepted. Clause 4 classifies the film, Clause 5 gives the designation format, Clauses 7 to 9 cover dimensions, properties, and roll behavior.

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

FprEN IEC 60674-3-1:2026 sets performance and handling requirements for polypropylene capacitor film and ties many checks to IEC 60674-2 test methods. The most important points are the material base, the film types, the electrical limits, and the roll-quality rules.

Material and classification

Clause 6 requires the film to be made essentially from isotactic type polypropylene homopolymer and to conform to IEC 60674-1. Clause 4 divides the product into Type 1, Type 2, and Type 3, with subtypes a, b, and c for untreated or pre-treated surfaces.

This matters because the type tells you whether the film is smooth, rough, or intended for very thin high-strength film. Type 1 uses smooth surfaces, Type 2 has at least one rough surface, and Type 3 is for thin film with high electric strength.

Identification and size

Clause 5 gives a designation scheme that includes the standard reference, PP, type, thickness, width, and length. Clause 7 sets the measurement approach for thickness and width, and it also notes that length and roll diameter are contract items.

For purchasing and incoming inspection, this means the film must be ordered and labeled in a consistent way. Thickness is measured differently for Type 2, where gravimetric thickness and bulking thickness are both relevant.

Physical and electrical performance

Clause 8.1 covers density, melting point, tensile strength, elongation at break, resistivity, dissipation factor, relative permittivity, and dimensional change for shrinkage. Clause 8.2 covers DC electric strength, while Clause 8.3 covers electrical weak spots.

In practice, this is the core qualification set for capacitor film. The document gives accepted test methods and limit values, so a supplier can show that the film meets the intended electrical and mechanical performance.

Surface treatment, impregnation, and surface structure

Clause 8.5 applies to pre-treated sides and sets a minimum wetting tension. Clauses 8.6 to 8.8 cover liquid absorption, compatibility with impregnants, and dissipation factor under impregnated conditions, but leave the exact limits and methods to agreement between supplier and purchaser. Clause 8.9 defines space factor and gives a preferred value for Type 2.

This is important because capacitor performance depends on how the film interacts with metallization and impregnants. The document gives a common framework, while the final process-specific targets are agreed for the application.

Roll quality

Clause 9 covers windability, joins, roll width, core, and labelling. It sets limits for bias, camber, sag, join construction, join count, edge offset, and the difference between film width and roll width, and it gives preferred core diameters.

These requirements matter for winding and converting. A film can meet electrical limits but still cause production problems if it is poorly wound, poorly joined, or inconsistently labeled.

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

FprEN IEC 60674-3-1:2026 relies on these key terms and abbreviations in its requirements:

• PP - polypropylene, the polymer used for the film.
• DC test - direct current electric-strength testing used in Clause 8.2.
• DSC - differential scanning calorimetry, used here for melting point measurement.
• Gravimetric thickness - thickness determined by weighing, used as the main thickness basis.
• Bulking thickness - thickness measured by micrometer on rough-surfaced film, relevant to Type 2.
• Space factor - the percentage increase in bulking thickness over gravimetric thickness.
• Wetting tension - a measure of surface wettability, used for pre-treated film surfaces.
• Impregnants - dielectric fluids used in impregnated capacitors.

Who uses FprEN IEC 60674-3-1:2026?

FprEN IEC 60674-3-1:2026 is used by capacitor manufacturers, film suppliers, test laboratories, and buyers who specify capacitor-grade PP film. It supports material selection, product qualification, incoming inspection, and quality control for films intended as dielectric in capacitors.

Engineers use it to choose a suitable film type and thickness range. Quality managers use it to verify test results and roll consistency. Buyers use it to write purchase specifications that match the capacitor process.

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

FprEN IEC 60674-3-1:2026 is a technical revision that replaces the second edition, Amendment 1, and Amendment 2. The stated changes are a complete editorial and technical revision and updated test methods to reflect current practice.

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

FprEN IEC 60674-3-1:2026 refers to IEC 60674-1 for definitions and general requirements, and to IEC 60674-2 for the test methods used throughout the specification. It also cites IEC 60674-3 (all sheets) as the parent series for individual material specifications.

For specific property tests, the document uses ISO 1183-2 for density and ISO 11357-3 for melting point by DSC. These references supply the measurement methods that support the acceptance values in the film specification.

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

FprEN IEC 60674-3-1:2026 contains four main tables that collect the property requirements for physical properties, DC electric strength, electrical weak spots, and maximum joins in a roll. It also includes method references for thickness, width, resistivity, dissipation factor, permittivity, wetting tension, space factor, and windability.

The document gives the acceptance framework for testing capacitor film, not just the product description. It is therefore useful both for design qualification and for production or incoming inspection of rolls before conversion into capacitors.

SLOVENSKI STANDARD
oSIST prEN IEC 60674-3-1:2025
01-november-2025
Plastične folije za električne namene - 3. del: Specifikacije za posamezne materiale
- 1. list: Dvoosno orientirane polipropilenske folije za kondenzatorje
Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet
1: Biaxially oriented polypropylene (PP) films for capacitors
Films plastiques à usages électriques - Partie 3: Spécifications pour matériaux
particuliers - Feuille 1: Films de polypropylène biorienté (PP) pour condensateurs
Ta slovenski standard je istoveten z: prEN IEC 60674-3-1:2025
ICS:
29.035.20 Plastični in gumeni izolacijski Plastics and rubber insulating
materiali materials
83.140.10 Filmi in folije Films and sheets
oSIST prEN IEC 60674-3-1:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60674-3-1:2025
oSIST prEN IEC 60674-3-1:2025
15/1069/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60674-3-1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-09-26 2025-12-19
SUPERSEDES DOCUMENTS:
15/1055/CD, 15/1065A/CC
IEC TC 15 : SOLID ELECTRICAL INSULATING MATERIALS
SECRETARIAT: SECRETARY:
United States of America Mr Solomon Chiang
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

TC 112
ASPECTS CONCERNED:
Electricity transmission and distribution, Electromagnetic Compatibility, Energy Efficiency, Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).
nex A
TITLE:
Plastic films for electrical purposes – Part 3: Specifications for individual materials – Sheet 1: Biaxially oriented
polypropylene (PP) films for capacitors

PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
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oSIST prEN IEC 60674-3-1:2025
IEC CDV 60674-3-1 © IEC 2025
Link to Committee Draft for Vote (CDV) online document:

https://osd.iec.ch/#/editor/archive/2c752e0c-a292-4759-e063-6d13000a4076/en/CCDV/1

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oSIST prEN IEC 60674-3-1:2025
IEC CDV 60674-3-1 © IEC 2025
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 . 6
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

oSIST prEN IEC 60674-3-1:2025
IEC CDV 60674-3-1 © IEC 2025
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
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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
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IEC [had/had not] received notice of (a) patent(s), which may be required to implement this
oSIST prEN IEC 60674-3-1:2025
IEC CDV 60674-3-1 © IEC 2025
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 60674–3–1 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 [publication_date],
Amendment 1:[publication_date] and Amendment 2:[publication_date]. 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) the test methods have been updated to reflect today’s state of the art.
The text of this International Standard is based on the following documents:
Draft Report on voting
15/XX/CDV 15/XX/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 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.
oSIST prEN IEC 60674-3-1:2025
IEC CDV 60674-3-1 © IEC 2025
INTRODUCTION
This standard 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 60674–1:1980);
Part 2: Methods of test (IEC 606
...