ISO/FDIS 25242

• Abstract:

  This document provides an environment test to determine the ability of the smart textiles systems (e.g. electrically heated garment) to withstand rapid changes of ambient temperature. It is applicable to jacket, vest, jumper etc., which is including the electrically operating part.

• Status: Not Published
• ICS: 59.080.80 - Smart textiles
• Technical Committee: ISO/TC 38 - Textiles
• Drafting Committee: ISO/TC 38/WG 32 - Smart textiles
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 21-Aug-2026
• Completion Date: 21-Aug-2026

Overview

ISO/FDIS 25242:2026 is an international standard developed by ISO/TC 38 for the textile industry, focusing on the performance assessment of smart textile systems under rapidly changing environmental temperatures. This standard provides a rigorous test method to determine the durability and reliability of smart textiles, such as electrically heated garments, when subjected to cyclic temperature variations. It covers a wide range of products including jackets, vests, and jumpers that contain electronically operated components.

Ensuring the ability of smart textiles to withstand rapid temperature changes is essential for maintaining product quality during storage, transportation, installation, and use. By following ISO/FDIS 25242, manufacturers, testers, and end-users can have confidence in the performance and safety of smart textiles systems used in dynamic and challenging environments.

Key Topics

• Test Methods and Procedures:

  • Specifies a standardized procedure using environmental chambers in accordance with IEC 60068-2-14 (Test Na for air/gas and Test Nc for liquid).
  • Details preparation, conditioning, mounting of specimens, and step-by-step instructions for conducting cyclic temperature change tests.

• Performance Assessment:

  • Measures and records key parameters such as initial run-time, in-operation run-time, and finished run-time.
  • Calculates the rate of change to evaluate performance efficiency and durability after test cycles.

• Applicability:

  • Relevant for smart textile systems with electronic components, primarily garments like jackets, vests, and jumpers.

• Reporting and Documentation:

  • Outlines comprehensive requirements for documenting all aspects of the test, including preconditioning, test results, recovery period, deviations from procedure, and unusual observations.

Applications

ISO/FDIS 25242 is highly practical across various sectors within the textiles and electronics industries where smart textiles are used:

• Product Development and Quality Assurance:

  • Helps designers and manufacturers ensure new smart textile products meet rigorous international standards for performance in fluctuating temperatures.
  • Assists in optimizing materials and construction methods to enhance product durability.

• Safety and Compliance Testing:

  • Used by laboratories and certification bodies to test compliance with global standards, ensuring consumer safety for wearable electronics.

• Procurement and Supply Chain:

  • Supports procurement agencies and buyers in specifying performance requirements for smart textiles, reducing risk in sourcing and deploying advanced garments.

• Consumer Confidence:

  • Increases trust among end-users, such as those in active outdoor, emergency, or industrial settings, who rely on reliable thermal performance from their smart clothing.

Related Standards

• ISO 139: Textiles - Standard atmospheres for conditioning and testing. Used for defining standard laboratory environments for all test procedures.
• IEC 60068-2-14:2023: Environmental Testing - Tests Na and Nc for change of temperature, forming the basis for environmental chamber requirements in cyclic testing.
• ISO/TR 23383:2020: Textiles and textile products - Smart textiles definitions, categorisation, applications, and standardization needs. Provides foundational terminology for understanding smart textile systems.

Practical Value

• Consistent Product Evaluation: Enables repeatable, objective testing for smart textile operating life under rapid temperature fluctuations.
• Global Market Access: Fulfilling ISO/FDIS 25242 facilitates easier global trade and acceptance of smart textile products.
• Risk Reduction: Identifies weaknesses in product design early, preventing potential failures or hazards in real-world use.

In summary, adoption of ISO/FDIS 25242:2026 ensures that smart textile systems are robust, reliable, and compliant with international best practices for environmental durability, thereby supporting innovation, user safety, and market confidence.

FINAL DRAFT
International
Standard
ISO/TC 38
Textiles — Smart textiles
Secretariat: SAC
systems — Test method for cyclic
Voting begins on:
environmental temperature change
2026-08-21
Textiles — Systèmes textiles intelligents — Méthode d'essai de
Voting terminates on:
changement cyclique de la température de l'environnement
2026-10-16
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 38
Textiles — Smart textiles
Secretariat: SAC
systems — Test method for cyclic
Voting begins on:
environmental temperature change
Textiles — Systèmes textiles intelligents — Méthode d'essai de
Voting terminates on:
changement cyclique de la température de l'environnement
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test equipment . 2
5 General requirements . 2
6 Test procedure . 2
6.1 General .2
6.2 Guidance for the selection of the kind of test .2
6.3 Sampling and preparation of test specimen .2
6.4 Preparation of the chamber .3
6.5 Mounting or supporting of the test specimen .3
6.6 Conditioning.3
6.7 Initial run-time measurement .3
6.8 Test cycle .3
6.9 In operation run-time measurement .4
6.10 Recovery .4
6.11 Finished run-time measurement.4
6.12 Rate of change .4
7 Test report . 4
Bibliography . 6

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was pr
...

ISO/DIS FDIS 25242:2026(en)
ISO/TC 38/WG 32
Secretariat: SAC
Date: 2026-08-07-20
Textiles — Smart textiles systems — Test method for cyclic
environmental temperature change
Textiles — Systèmes textiles intelligents — Méthode d'essai de changement cyclique de la température de
l'environnement
FDIS stage
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test equipment . 2
5 General requirements . 2
6 Test procedure . 2
6.1 General. 2
6.2 Guidance for the selection of the kind of test . 2
6.3 Sampling and preparation of test specimen . 2
6.4 Preparation of the chamber . 3
6.5 Mounting or supporting of the test specimen . 3
6.6 Conditioning . 3
6.7 Initial run-time measurement . 3
6.8 Test cycle . 3
6.9 In operation run-time measurement . 4
6.10 Recovery . 5
6.11 Finished run-time measurement . 5
6.12 Rate of change . 5
7 Test report . 5
Bibliography . 7

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Field Code Changed
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
Field Code Changed
This document was prepared by Technical Committee ISO/TC 38, Textiles.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
During their use, e-textiles (smart textiles) can experience to extreme cold environments so durability is a
critical property.
A change of temperature test is intended to determine the effect on the specimen of a change of temperature
or a succession of changes of temperature.
This document specifies the test method and assessment of their performance under conditions of storage,
transportation, installation and use.
v
Textiles — Smart textiles systems — Test method for cyclic
environmental temperature change
1 Scope
This document provides an environment test to determine the ability of smart textiles (e.g. electrically heated
garment) to withstand rapid changes of ambient temperature.
This document is applicable to jacket, vest, jumper, etc., which includes the electrically operating part.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content consti
...