ISO 17236:2025
(Main)Leather — Physical and mechanical tests — Determination of extension set
Leather — Physical and mechanical tests — Determination of extension set
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.
Cuir — Essais physiques et mécaniques — Détermination de la déformabilité
ISO 17236:2016 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.
General Information
Relations
Standards Content (Sample)
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
IULTCS/IUP 43:2025(en) © ISO 2025
IULTCS/IUP 43:2025(en)
© ISO 2025
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ii
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
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).
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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)
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IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further
the advancement of leather science and technology. IULTCS has three Commissions, which are responsible
for establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an
international standardizing body for the preparation of test methods for leather.
This document was prepared by the Physical Test Commission of the International Union of Leather
Technologists and Chemists Societies (IUP Commission, IULTCS) in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
It is based on IUP 43 published in J. Soc. Leather Tech. Chem. 84, p. 399, 2000, and declared an official method
of the IULTCS in March 2001.
This third edition cancels and replaces the second edition (ISO 17236:2016), which has been technically
revised.
The main changes are as follows:
— alignment with the changes and revised terminology in ISO 2418 and ISO 2419;
— a new Clause 3 is included.
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
International Standard
IULTCS/IUP 43:2025(en)
Leather — Physical and mechanical tests — Determination of
extension set
1 Scope
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.
2 Normative references
The follow
...
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