oSIST prEN IEC 63203-302-1:2026

• Status: Not Published
• Public Enquiry End Date: 30-Nov-2026
• ICS: 19.080 - Electrical and electronic testing
• ICS: 59.080.80 - Smart textiles
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 07-Oct-2026
• Due Date: 24-Feb-2027
• Ref Project: prEN IEC 63203-302-1:2026 - IEC 63203-302-1: Wearable electronic devices and technologies - Part 302-1: Materials - Test method for torsion of conductive stretchable films

oSIST prEN IEC 63203-302-1:2026 is a Slovenian standard identical to prEN IEC 63203-302-1:2026 from the International Electrotechnical Commission (IEC). It specifies a torsion test method for conductive stretchable films used in wearable electronic devices, so users can measure how twisting changes electrical resistance and how the material behaves under use-like deformation.

The document is aimed at people who need repeatable test data for material screening, design guidance, or reliability evaluation of stretchable circuit materials.

What does oSIST prEN IEC 63203-302-1:2026 specify?

oSIST prEN IEC 63203-302-1:2026 specifies a test method for ribbon-shaped conductive stretchable films on stretchable substrates. The method is intended to determine changes in electrical properties and practical robustness during torsion, especially for wearable products worn on skin directly or attached to clothing.

The scope covers torsion conditions likely to occur around the arm, wrist, and neck. It explicitly frames the test as a practical use-oriented method rather than a direct material property rating for twisting durability.

The document is organized into:

• Scope
• Normative references
• Terms and definitions
• Standard atmospheric conditions for test
• Test conditions
• Single torsion test
• Cyclic torsion test

What are the key requirements of oSIST prEN IEC 63203-302-1:2026?

Test setup and specimen preparation

Clause 4 sets the standard atmospheric conditions for conditioning and measurement, using temperature, humidity, and pressure ranges aligned with IEC 62715-6-1. In practice, this matters because electrical resistance can shift with environment, so test results need consistent ambient conditions.

Clause 5.1 requires torsion test equipment that can apply and maintain the required twist angle, at least ±90°, and accept specimens from 80 mm to 240 mm long and up to 200 mm wide. The specimen must be electrically insulated from the machine frame so resistance can be measured in situ during motion.

Clause 5.2 calls for a rectangular or square strip specimen, with the conductive film on a stretchable substrate. The test length is the exposed length between the grips, not the clamped zones, and the length-to-width ratio is recommended to be greater than 1.

Clause 5.3 requires secure clamping without pre-stressing, wrinkling, slack, or slip. This is important because unwanted mechanical disturbance can hide the real torsion behavior or damage the specimen.

Torsion modes and electrical measurement

Clause 5.1.2 describes tension-released torsion, where the stationary side can move axially to avoid unwanted axial tension. Clause 5.1.3 describes tension-held torsion, where the stationary side is fixed so torsion is combined with axial tension. Together, these two modes let users compare twisting alone with twisting plus stretch.

Clause 5.4 requires resistance measurement in a region of nearly uniform strain, using 2-wire or 4-wire measurement as appropriate. A 4-wire method is required when contact and lead resistance would affect the result, and the clamp contact must not measurably influence the measured resistance.

The clause also gives a way to convert measured resistance to sheet resistance. In practice, this lets labs report results in a form that is easier to compare between specimens and designs.

Single torsion test

Clause 6 defines the single torsion test for measuring the range of resistance change during one torsion cycle. Recommended torsion angles are 15°, 30°, 45°, and 90°, with oscillation velocities of 10, 20, and 30 cycles per minute.

The procedure measures initial resistance, twists clockwise and counterclockwise, returns to the starting state, and records resistance in real time. At least 20 data points per cycle are required, so the resistance trace captures transient changes that a start-end measurement would miss.

Cyclic torsion test and reporting

Clause 7 defines the cyclic torsion test for repeated torsion over time. Recommended cycle counts include 1 000, 10 000, and 100 000 cycles, which helps users assess longer-term resistance drift under repeated twisting.

Both test reports require specimen identification, specimen count, atmospheric conditions, torsion type, torsion angle, oscillation velocity, recording interval, and unusual observations or deviations. This makes the results traceable and usable for comparison between laboratories or product designs.

What terms does oSIST prEN IEC 63203-302-1:2026 define?

• Torsion test - deformation that twists the film plane by rotating both ends in opposite directions.
• Conductive stretchable film - a stretchable substrate with a conductor layer formed on it.
• Stretchable substrate - a substrate or film that returns to its original size and shape after the extending force is removed.
• Tension-released torsion test - a torsion setup that allows axial movement so extra tension is released during twisting.
• Tension-held torsion test - a torsion setup with the stationary side fixed so torsion occurs together with axial tension.

Who uses oSIST prEN IEC 63203-302-1:2026?

oSIST prEN IEC 63203-302-1:2026 is used by laboratories, materials engineers, and product developers working on wearable electronic devices and smart textiles. It is relevant for test planning, specimen preparation, resistance measurement, and reliability comparison of conductive stretchable films used in circuit patterns.

It also supports quality and supplier evaluation when a buyer or manufacturer needs a common torsion test method for comparing candidate materials or checking production consistency.

Which standards are used with oSIST prEN IEC 63203-302-1:2026?

• IEC 63203-101-1:2021 - provides wearable-electronics terminology, including the definition used for stretchable substrate.
• IEC 62899-502-1:2017 - contributes torsion-test terminology and related mechanical stress test context.
• IEC 62715-6-1:2018 - provides the standard atmospheric conditions used for testing.
• IEC 62951-1:2017 - provides a comparable specimen shape referenced for the test specimen layout.

What does the oSIST prEN IEC 63203-302-1:2026 document contain?

The document contains two test procedures, one for single torsion and one for cyclic torsion, each with step-by-step execution and a required report content. It also includes equipment arrangements for tension-released and tension-held torsion, specimen shape guidance, clamping guidance, and a resistance measurement setup.

Figures show the torsion equipment, the two torsion modes, the specimen shape, the clamping process, and the resistance-measurement arrangement. Clause 5.4 also includes the equation used to relate measured resistance to sheet resistance.

For practical use, this gives labs a repeatable way to set up the specimen, run the twist motion, record resistance in real time, and document the test conditions needed for later comparison, design work, or reliability modelling.

SLOVENSKI STANDARD
01-november-2026
IEC 63203-302-1: Nosljive elektronske naprave in tehnologije - 302-1. del: Materiali
- Preskusna metoda za torzijo prevodnih raztegljivih folij
IEC 63203-302-1: Wearable electronic devices and technologies - Part 302-1: Materials -
Test method for torsion of conductive stretchable films
Ta slovenski standard je istoveten z: prEN IEC 63203-302-1:2026
ICS:
19.080 Električno in elektronsko Electrical and electronic
preskušanje testing
59.080.80 Inteligentne tekstilije Smart textiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

124/401/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 63203-302-1 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-10-02 2026-12-25
SUPERSEDES DOCUMENTS:
124/372/CD, 124/400/CC
IEC TC 124 : WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES
SECRETARIAT: SECRETARY:
Korea, Republic of Mr Jae Yeong Park
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
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
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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).

TITLE:
Wearable electronic devices and technologies - Part 302-1: Materials - Test method for torsion
of conductive stretchable films

PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
In accordance with Recommendation #9 of 124/AG 1/RM of TC 124/AG 1 meeting held on 2026 -06-12,
TC 124 agreed this project proceed to the CDV stage.

download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
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IEC CDV 63203-302-1 ED1 © IEC 2026
1 CONTENTS
3 FOREWORD . 2
4 INTRODUCTION . 4
5 1 Scope . 5
6 2 Normative references . 5
7 3 Terms and definitions . 5
8 4 Standard atmospheric conditions for test . 6
9 5 Test conditions . 6
10 5.1 Test equipment . 6
11 5.1.1 Torsion test equipment . 6
12 5.1.2 Tension- released torsion test. 7
13 5.1.3 Tension-held torsion test . 7
14 5.2 Test specimen . 8
15 5.3 Clamping of the test specimen . 8
16 5.4 Resistance measurement . 9
17 6 Single torsion test . 10
18 6.1 General . 10
19 6.2 Test procedure. 10
20 6.3 Test report . 11
21 7 Cyclic torsion test . 11
22 7.1 General . 11
23 7.2 Test procedure. 11
24 7.3 Test report . 12
26 Figure 1 – Equipment for torsion test . 7
27 Figure 2 – Tension-released and tension-held torsion test . 8
28 Figure 3 – Shape of a test specimen . 8
29 Figure 4 – Clamping process of the test specimen . 9
30 Figure 5 – Setting for resistance measurement . 10
IEC CDV 63203-302-1 ED1 © IEC 2026
35 INTERNATIONAL ELECTROTECHNICAL COMMISSION
36 ____________
38 WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES
40 Part 302-1: Materials - Test method for torsion of conductive stretchable
41 films
43 FOREWORD
44 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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72 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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80 IEC 63203-302-1 has been prepared by IEC technical committee 124: Wearable electronic
81 devices and technologies. It is an International Standard.
82 The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
84 Full information on the voting for its approval can be found in the report on voting indicated in
85 the above table.
86 The language used for the development of this International Standard is English.
IEC CDV 63203-302-1 ED1 © IEC 2026
87 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
88 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
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93 specific document. At this date, the document will be
94 • reconfirmed,
95 • withdrawn,
96 • replaced by a revised edition, or
97 • amended.
IEC CDV 63203-302-1 ED1 © IEC 2026
100 INTRODUCTION
101 Wearable electronic devices bend naturally with the human body, but around wrists, elbows and
102 necks they twist, exposing conductive films to torsional shear that pure tensile tests cannot
103 replicate. Existing IEC 62899-202-4 rigorously measures changes in resistance under
104 incremental and cyclic stretch but its specimen geometry, loading mode and failure criteria are
105 limited to uniaxial tension and thus overlook the mixed-mode cracks, interfacial slip and local
106 buckling triggered by twist.
107 Finite-element studies show that the maximum shear strain in a twisted strip is proportional to
108 the twist angle, producing delamination at roughly half the tensile strain required in stretch tests,
109 while real-time resistance drifts reveal transient open circuits long before a two-point break
110 would be detected in tension. To fill this gap IEC 63203-302-1 introduces a dedicated torsion
111 method that grips a conductive stretchable film and rotates the ends through defined clockwise
112 and counter-clockwise angles, both with and without axial restraint, capturing the combined
113 pull-and-twist conditions seen during everyday wear.
114 Single-cycle measurements establish the immediate resistance excursion that limits signal
115 fidelity, whereas accelerated cyclic testing compresses months of arm-swing into hours to
116 predict service life. The protocol provides designers with critical torsional metrics needed to
117 properly size line widths, pitches, and encapsulation. Without these data manufacturers are
118 forced to overspecify conductors, sacrificing flexibility and comfort; with them they can certify
119 reliability confidently while maintaining the lightweight, skin-conformal form factors that define
120 next-generation wearables.
121 The value of this standard is that it provides baseline data on how the material layer withstands
122 the combined shear and tension that arise during twisting. For that reason, the test specimen
123 is designed as a wide rectangular conductive film. Using a broad film creates a continuous
124 gradient of shear, tensile and compressive stresses from the twist axis to the edges; this quickly
125 reveals intrinsic weak points such as delamination, cracking or resistance drift. The results can
126 therefore be used to material screening, design guidance and/or reliability modelling.
IEC CDV 63203-302-1 ED1 © IEC 2026
130 WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES
132 Part 302-1: Materials - Test method for torsion of conductive stretchable
133 films
137 1 Scope
138 This document specifies a test method for torsion of ribbon shaped conductive stretchable films
139 for the determination of change of electrical properties by the torsion motion and robustness as
140 the materials for the circuit pattern of wearable electronic devices using stretchable substrate.
141 In the wearable environments, tension-held and/or tension-released torsion motions of
142 wearable electronic devices are likely to happen easily during use on such as the arm, wrist
143 and neck. depending on the motion of human body. This document provides general procedures
144 for torsion test methods applicable to conductive stretchable films used in the production of
145 wearable electronic devices wearing on human skin directly or attached to clothing which
146 contact human skin, excluding e-textile types. The measurement method does not specify the
147 twisting durability as a material property, but has an aspect of practical testing conducted under
148 conditions closer to actual use.
149 2 Normative references
150 The following documents are referred to in the text in such a way that some or all of their content
151 constitutes requirements of this document. For dated references, only the edition cited applies.
152 For undated references, the latest edition of the referenced document (including any
153 amendments) applies.
154 IEC 63203-101-1:2021, Wearable electronic devices and technologies - Part 101-1:
155 Terminology
156 IEC 62899-502-1:2017, Printed electronics – Part 502-1: Quality assessment – Organic light
157 emitting diode (OLED) elements – Mechanical stress testing of OLED elements formed on
158 flexible substrates
159 IEC 62715-6-1:2018, Flexible Display Devices – Part 6-1: Mechanical test methods –
160 Deformation tests
161 IEC 62951-1:2017, Semiconductor devices - Flexible and stretchable semiconductor devices -
162 Part 1: Bending test method for conductive thin films on flexible substrates
163 3 Terms and definitions
164 For the purposes of this document, the following terms and definitions apply.
165 ISO and IEC maintain terminology databases for u
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