kSIST FprEN IEC 60674-3-1:2026

• Status: Not Published
• Public Enquiry End Date: 30-Nov-2025
• ICS: 29.035.20 - Plastics and rubber insulating materials
• ICS: 83.140.10 - Films and sheets
• Technical Committee: IIZS - Insulating materials and systems
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 23-Jul-2026
• Due Date: 10-Sep-2026
• Completion Date: 23-Jul-2026
• Ref Project: 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: SIST 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 (IEC 60674-3-1:2021)
• Effective Date: 21-Jan-2025

kSIST FprEN IEC 60674-3-1:2026 is a SIST draft of IEC 60674-3-1 for plastic films for electrical purposes. It specifies requirements for biaxially oriented polypropylene (PP) films used as dielectric films in capacitors, including film type, dimensions, electrical properties, and roll characteristics. The document is intended for manufacturers, capacitor makers, purchasers, and test laboratories that need a common material specification.

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

kSIST FprEN IEC 60674-3-1:2026 covers biaxially oriented polypropylene film with smooth or rough surfaces, and surface pre-treatment when needed for vacuum metallization. The films are intended for use as dielectric in capacitors, so the standard is about choosing and checking film material for electrical performance, not about finished capacitor design.

The document is organized into clauses on scope, normative references, terms, classification, designation, general requirements, dimensions, properties, and roll characteristics, followed by a bibliography. In practice, that structure lets a reader move from identifying the film type to checking its measured properties and roll form.

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

kSIST FprEN IEC 60674-3-1:2026 starts by classifying the film into Types 1, 2, and 3, with subtypes a, b, and c for untreated, one-side pre-treated, or both-side pre-treated film. This matters because the type defines the surface condition and whether the film is ready for vacuum metallization.

The designation clause gives a fixed ordering for identifying the film: standard reference, PP, type, thickness, width, and length. That helps buyers and suppliers write unambiguous purchase descriptions and avoids confusion between surface condition and dimensions.

The general requirements state that the material shall be made essentially from isotactic polypropylene homopolymer and shall conform to IEC 60674-1. This links the sheet to the common rules of the series and keeps the base material consistent.

Clause 7 covers dimensions. Thickness is measured using IEC 60674-2 methods, and Type 2 also distinguishes gravimetric thickness from bulking thickness because rough surfaces change the apparent thickness. Width is also measured by IEC 60674-2, while the width tolerance above 750 mm is stated separately. For procurement, this is the part that fixes what must be ordered and checked on delivery.

Clause 8.1 and Table 1 set the main physical property checks, including density, melting point, tensile strength, elongation at break, surface resistivity, volume resistivity, dissipation factor, relative permittivity, and dimensional change for shrinkage. In practice, these are the routine quality-control properties that show whether the film is mechanically stable and electrically suitable.

Clause 8.2 and Table 2 specify DC electric strength, with thickness-dependent limits and elevated-temperature testing for the thinnest films. Clause 8.3 and Table 3 set limits for electrical weak spots and require at least 5 m² of film to be tested. These are the key dielectric integrity checks for capacitor film.

Clauses 8.5 to 8.9 deal with surface treatment, liquid interaction, impregnant compatibility, dissipation factor under impregnated conditions, and space factor. Type 1b, 1c, 2b, 2c, 3b, and 3c films must meet wetting tension requirements, and Type 2 has a preferred space factor value. These clauses matter when the film will be metallized or used in impregnated capacitors.

Clause 9 covers roll characteristics such as windability, joins, roll width, core, and labelling. For production and receiving inspection, this is where reel quality, splice control, and identification of the pre-treated side are checked.

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

• PP - Polypropylene, the polymer used for the film.
• Space factor - The percentage increase in bulking thickness over gravimetric thickness caused by surface roughness.
• Gravimetric thickness - Thickness determined by weighing, used as the main thickness basis for the film.
• Bulking (micrometric) thickness - Thickness measured by micrometer, used when rough surface structure changes the apparent thickness.
• Corona treated / pre-treated - A surface treatment that helps vacuum deposition of metal adhere to the film.
• Impregnant - The liquid used in an impregnated capacitor.
• Joins (splices) - Intentional joints in a roll that must be built and marked so they can be seen from the roll ends.

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

The standard is used by film manufacturers, capacitor manufacturers, purchasing teams, quality managers, and laboratory staff. It is especially useful when writing material specifications, checking incoming rolls, qualifying film for metallized or impregnated capacitors, and comparing test results against a common method set.

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

kSIST FprEN IEC 60674-3-1:2026 replaces the second edition and its amendments. The stated changes are a full editorial and technical revision, inclusion in the IEC 60674 series, and updated test methods to reflect the current state of the art.

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

Reference	What it contributes
IEC 60674-1:1980	Definitions and general requirements used for the material rules, tolerances, and joins
IEC 60674-2:2016	Test methods for thickness, width, electrical properties, windability, and other measurements
ISO 1183-2:2019	Density measurement method used in Table 1
ISO 11357-3:2018	DSC method used for melting point in Table 1
IEC 60674-3 (all sheets)	The parent series of individual material specifications for plastic films for electrical purposes

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

The document contains the classification of PP film types, the designation rule, the general material requirement, and the dimension and property checks needed for capacitor film. It also contains four main tables: physical properties, DC electric strength, electrical weak spots, and maximum joins within a roll.

Clause 9 adds the roll-quality items that matter in production and receiving inspection, including windability, splice construction, roll-width control, preferred core sizes, and side marking for pre-treated film. The bibliography points to the density and DSC standards used in the property table.

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:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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

How to access
This link leads you to the Online Standards Development (OSD) platform for National Mirror Committee’s
(NMC) comments. The project draft may be found further down this document.

Resource materials
We recommend NCs to review the available materials to better understand the member commenting on the
OSD platform.
This includes the:
• OSD NC roles overview
• How to add and submit comments to the IEC

Contact
Should you require any assistance, please contact the IEC IT Helpdesk.
ii
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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
standardization comprising all national electrotechnical committees (IEC National Committees).
The object of IEC is to promote international co-operation on all questions concerning
standardization in the electrical and electronic fields. To this end and in addition to other
activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National
Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as
possible, an international consensus of opinion on the relevant subjects since each technical
committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted
by IEC National Committees in that sense. While all reasonable efforts are made to ensure that
the technical content of IEC Publications is accurate, IEC cannot be held responsible for the
way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply
IEC Publications transparently to the maximum extent possible in their national and regional
publications. Any divergence between any IEC Publication and the corresponding national or
regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies
provide conformity assessment services and, in some areas, access to IEC marks of conformity.
IEC is not responsible for any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including
individual experts and members of its technical committees and IEC National Committees for
any personal injury, property damage or other damage of any nature whatsoever, whether direct
or indirect, or for costs (including legal fees) and expenses arising out of the publication, use
of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
publications is indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC [had/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
...