EN ISO 17236:2025
(Main)Leather - Physical and mechanical tests - Determination of extension set (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
Relations
Overview
EN ISO 17236:2025 is an essential international standard titled Leather - Physical and mechanical tests - Determination of extension set. Published in June 2025 by the European Committee for Standardization (CEN) in collaboration with the International Union of Leather Technologists and Chemists Societies (IULTCS), this standard specifies a reliable method to measure the extension set of leather materials. Primarily designed for upholstery leather, it applies broadly to all flexible leathers, ensuring consistent and repeatable testing results across the leather industry.
This third edition supersedes the 2016 version and includes updates that align terminology with ISO 2418 and ISO 2419 standards. Its objective is to provide a standardized procedure that helps manufacturers, quality controllers, and researchers evaluate leather’s mechanical behavior under repeated stretching, thus supporting product development, quality assurance, and compliance testing.
Key Topics
Scope and Purpose
Determines the permanent deformation (extension set) of leather after cyclic tensile loading, which is crucial for assessing durability and performance in end-use applications.Testing Principle
The standard involves cyclically extending a leather test piece to a set force level, holding it under load, and then measuring the residual extension after unloading. The extension set is expressed as a percentage of the initial gauge length.Specimen Preparation and Conditioning
Test specimens are cut from leather samples following ISO 2418, conditioned under standard atmospheres per ISO 2419, and thickness measurements are taken according to ISO 2589 to ensure uniformity and accuracy.Apparatus Requirements
Utilizes a tensile testing machine calibrated according to ISO 7500-1, equipped with jaws that prevent slippage, a press knife for precise specimen cutting, a ruler, thickness gauge, and stopwatch for timing loading cycles.Test Procedure
- Mark specimens with parallel lines to gauge elongation length.
- Subject specimens to five tensile load cycles reaching 20 N ± 0.5 N.
- Maintain load for 10 seconds during each cycle.
- Measure extension after a waiting period of 60 seconds post-testing.
- Calculate extension set percentage using a defined formula.
Results and Reporting
Reports must include detailed identification of test specimens, environmental conditioning parameters, pre-load values, average extension set values, specimen thickness, deviations from the test method, and test date.
Applications
EN ISO 17236:2025 is vital for industries and professionals involved with leather product manufacturing and testing, particularly where leather durability and mechanical properties are critical. Key applications include:
Upholstery Leather Quality Control
Ensuring leather used in furniture maintains dimensional stability under mechanical stress for better longevity and comfort.Footwear and Leather Goods Testing
Assessing the extension behavior helps predict product performance during wear and handling.Research and Development
Supporting material innovation by providing accurate mechanical property data to guide formulation adjustments.Regulatory Compliance and Certification
Facilitates meeting customer and regulatory requirements for leather physical properties through consistent testing protocols.
Related Standards
To fully comply and implement EN ISO 17236:2025, familiarity with associated standards is recommended:
- ISO 2418 - Leather: Specimen preparation and positioning.
- ISO 2419 - Conditioning and testing environments of leather specimens.
- ISO 2589 - Leather: Methods for measuring leather thickness.
- ISO 7500-1:2018 - Calibration and verification methods for tensile testing machines.
By following EN ISO 17236:2025 in conjunction with these standards, organizations can ensure comprehensive and harmonized evaluation of leather's mechanical properties, thereby improving product reliability and competitive advantage.
Keywords: EN ISO 17236:2025, leather testing standard, extension set determination, physical mechanical leather tests, upholstery leather testing, tensile testing leather, leather durability, leather quality control, ISO leather standards, leather specimen preparation, mechanical properties of leather.
Frequently Asked Questions
EN ISO 17236:2025 is a standard published by the European Committee for Standardization (CEN). Its full title is "Leather - Physical and mechanical tests - Determination of extension set (ISO 17236:2025)". This standard covers: 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.
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.
EN ISO 17236:2025 is classified under the following ICS (International Classification for Standards) categories: 59.140.30 - Leather and furs. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 17236:2025 has the following relationships with other standards: It is inter standard links to EN ISO 17236:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN ISO 17236:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
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: +41 22 749 01 11
Email: copyright@iso.org
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
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...