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

Overview

kSIST FprEN IEC 60674-3-1:2026 specifies the essential requirements for biaxially oriented polypropylene (PP) films used as dielectric elements in capacitors for electrical purposes. Developed by the Slovenian Institute for Standardization (SIST) and aligned with international IEC standards, this document identifies the physical, electrical, and dimensional characteristics necessary for polypropylene films used in the manufacturing and design of capacitors. These specifications help ensure consistent quality, reliability, and safety in electrical insulation applications, contributing to efficient and dependable operation in the electrical and electronics industries.

Key Topics

• Scope and Classification

  • Defines film types by surface characteristics (smooth, rough, high electric strength) and pre-treatments (untreated, one/both sides treated for vacuum metallization).
  • Clarifies the application of these polypropylene films as capacitor dielectrics.

• Material Requirements

  • Stipulates that films must be produced from isotactic polypropylene homopolymer.
  • Requires compliance with general quality parameters set by IEC 60674-1.

• Dimensional Specifications

  • Outlines methods and tolerances for measuring thickness and width to maintain critical design features.
  • Preferred thicknesses and tolerances are specified for each film type to support diverse capacitor designs.

• Physical and Electrical Properties

  • Details minimum requirements for characteristics such as density, melting point, tensile strength, elongation at break, and electrical resistivity.
  • Specifies electric strength under DC test conditions, electrical weak spot maximums, and preferred space factor values for surface roughness.

• Roll Characteristics and Labelling

  • Defines requirements for film roll windability, maximum allowable joins or splices, core sizes, and accurate labelling of treated surfaces for efficient material handling and processing.

Applications

Biaxially oriented polypropylene (PP) films covered by this standard are crucial for:

• Manufacture of Electrical Capacitors

  • Used as dielectric materials in film capacitors, both for power transmission and for a wide range of industrial and consumer electronics.
  • Suitable for dry and impregnated capacitor construction based on compatibility with various dielectric fluids.

• Electrical Insulation

  • Provides reliable electrical insulation for applications requiring high electric strength and minimal electrical losses.
  • Ensures operational safety and extended lifetime of electrical components.

• Power Transmission and Distribution

  • Supports insulation needs in high-voltage and low-voltage capacitors, improving efficiency and electromagnetic compatibility within electrical networks.

• Component Design Flexibility

  • Offers various thicknesses and surface treatments to meet the unique design and environmental demands of advanced capacitor technologies.

Related Standards

For comprehensive application and compliance, the following standards should be referenced alongside kSIST FprEN IEC 60674-3-1:2026:

• IEC 60674-1: Plastic films for electrical purposes - Part 1: Definitions and general requirements
• IEC 60674-2: Plastic films for electrical purposes - Part 2: Methods of test
• IEC 60674-3 (all sheets): Additional specifications for individual materials within the 60674 series
• ISO 1183-2: Plastics – Methods for determining the density of non-cellular plastics
• ISO 11357-3: Plastics – Differential scanning calorimetry (DSC) – Determination of temperature and enthalpy of melting and crystallization

By adhering to kSIST FprEN IEC 60674-3-1:2026 and its related standards, manufacturers and users of plastic films for electrical applications gain assurance in material suitability, product interoperability, safety, and performance, thus supporting global consistency in capacitor production and usage.

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
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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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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
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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
...