SIST EN ISO 17236:2025

Leather - Physical and mechanical tests - Determination of extension set (ISO 17236:2025)

This document specifies a method for determining the extension set of leather. It is intended for use on upholstery leather but is applicable to all flexible leathers.

Leder- Physikalische und mechanische Prüfungen- Bestimmung der bleibenden Dehnung (ISO 17236:2025)

Dieses Dokument legt ein Verfahren zur Bestimmung der bleibenden Dehnung von Leder fest. Das Verfahren ist für den Einsatz bei Möbelleder vorgesehen, darüber hinaus aber für alle flexiblen Leder anwendbar.

Cuir - Essais physiques et mécaniques - Détermination de la déformabilité (ISO 17236:2025)

Le présent document spécifie une méthode permettant de déterminer la déformabilité du cuir. Elle est destinée à être appliquée aux cuirs d’ameublement mais elle est également applicable à tous les cuirs souples.

Usnje - Fizikalni in mehanski preskusi - Ugotavljanje raztezka celote (ISO 17236:2025)

Ta dokument določa metodo za ugotavljanje raztezka celote usnja. Namenjen je za usnje za oblazinjenje, vendar se uporablja za vse vrste upogljivega usnja.

General Information

• Status: Published
• Public Enquiry End Date: 19-Oct-2024
• Publication Date: 02-Jul-2025
• ICS: 59.140.30 - Leather and furs
• Technical Committee: IUSN - Leather
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Jun-2025
• Due Date: 21-Aug-2025
• Completion Date: 03-Jul-2025
• Ref Project: EN ISO 17236:2025 - Leather - Physical and mechanical tests - Determination of extension set (ISO 17236:2025)

Relations

• Refers: SIST EN 12101-13:2022 - Smoke and heat control systems - Part 13: Pressure differential systems (PDS) - Design and calculation methods, installation, acceptance testing, routine testing and maintenance
• Effective Date: 28-Jan-2026
• Revises: SIST EN ISO 17236:2016 - Leather - Physical and mechanical tests - Determination of extension set (ISO 17236:2016)
• Effective Date: 24-Apr-2024

Overview

SIST EN ISO 17236:2025 - Leather - Physical and mechanical tests - Determination of extension set (ISO 17236:2025), published by CEN, establishes a standardized method for determining the extension set of leather. This standard is primarily intended for upholstery leather but is applicable to all flexible leathers. The test evaluates the permanent elongation (extension set) that remains in leather after it has been subjected to repeated extension under controlled conditions. This information is essential for assessing the durability and performance of leather used in various applications.

Key Topics

• Extension Set Testing: The document outlines a method to measure the extension set, which is the permanent stretch that leather undergoes after being repeatedly loaded.
• Applicability: While the procedure focuses on upholstery leather, the standard method can be applied to any type of flexible leather.
• Specimen Preparation: Detailed guidance is provided for the selection, preparation, and conditioning of leather specimens, referencing related standards for testing consistency.
• Apparatus and Equipment: The procedure specifies the use of tensile testing machines, thickness gauges, press knives, and rulers suitable for the precise measurement of leather’s physical properties.
• Test Procedure: The leather sample is repeatedly elongated under set conditions, and measurements are taken before and after to calculate the extension set as a percentage of the original length.
• Reporting: The standard prescribes the details to be included in the test report for traceability, repeatability, and cross-comparison.
• Alignment with Other Standards: SIST EN ISO 17236:2025 ensures compatibility and alignment with related standards, such as ISO 2418 and ISO 2419, for specimen preparation and conditioning.

Applications

SIST EN ISO 17236:2025 is highly relevant across the leather industry, particularly for:

• Upholstery Manufacturers: Ensuring consistent quality and long-term durability of leather used in furniture and automotive seating.
• Footwear and Garment Producers: Assessing and comparing the physical properties of leather for products where flexibility and resistance to permanent stretch are crucial.
• Quality Control Laboratories: Providing a reproducible method for quality assurance and product benchmarking.
• Leather Suppliers and Buyers: Enabling a transparent comparison of material properties to meet contractual and regulatory requirements.
• Product Development and R&D: Supporting innovation within the leather industry through standardized testing and material performance assessment.
• Regulatory Compliance: Contributing to compliance with European and international market regulations for leather goods.

The standard gives both manufacturers and clients the assurance that leather products meet key physical performance parameters, directly impacting customer satisfaction and product lifespan.

Related Standards

For comprehensive leather testing and assessment, the following standards are closely related and referenced within SIST EN ISO 17236:2025:

• ISO 2418: Specifies the position and preparation of specimens for chemical, physical, and mechanical leather tests.
• ISO 2419: Covers the conditioning of specimens and test pieces prior to physical and mechanical leather tests.
• ISO 2589: Outlines the method for determining the thickness of leather.
• ISO 7500-1:2018: Details the calibration and verification of force-measuring systems in testing machines.

These standards, used in conjunction with SIST EN ISO 17236:2025, facilitate a reliable, standardized approach to physical and mechanical testing of leather, supporting global trade and technological development in the leather sector. Adherence to these methods ensures consistent results, fosters industry best practices, and supports continuous improvement in product quality.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Usnje - Fizikalni in mehanski preskusi - Ugotavljanje raztezka celote (ISO
17236:2025)
Leather - Physical and mechanical tests - Determination of extension set (ISO
17236:2025)
Leder- Physikalische und mechanische Prüfungen- Bestimmung der bleibenden
Dehnung (ISO 17236:2025)
Cuir - Essais physiques et mécaniques - Détermination de la déformabilité (ISO
17236:2025)
Ta slovenski standard je istoveten z: EN ISO 17236:2025
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17236
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 59.140.30 Supersedes EN ISO 17236:2016
English Version
Leather - Physical and mechanical tests - Determination of
extension set (ISO 17236:2025)
Cuir - Essais physiques et mécaniques - Détermination Leder- Physikalische und mechanische Prüfungen-
de la déformabilité (ISO 17236:2025) Bestimmung der bleibenden Dehnung (ISO
17236:2025)
This European Standard was approved by CEN on 2 June 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17236:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17236:2025) has been prepared by Technical Committee ISO/IULTCS
"International Union of Leather Technologists and Chemists Societies" in collaboration with Technical
Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 17236:2016.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 17236:2025 has been approved by CEN as EN ISO 17236:2025 without any modification.

International
Standard
ISO
IULTCS
IUP 43
Third edition
Leather — Physical and
2025-05
mechanical tests — Determination
of extension set
Cuir — Essais physiques et mécaniques — Détermination de la
déformabilité
Reference numbers
ISO 17236:2025(en)
IULTCS/IUP 43:2025(en) © ISO 2025

ISO 17236:2025(en)
IULTCS/IUP 43:2025(en)
© ISO 2025
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 17236:2025(en)
IULTCS/IUP 43:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Selection of leather specimen and test piece preparation . 2
7 Procedure . 2
8 Expression of results . 3
9 Test report . 3

iii
ISO 17236:2025(en)
IULTCS/IUP 43:2025(en)
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
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