Leather — Physical and mechanical tests — Determination of heat resistance of patent leather

ISO 17232:2017 specifies two methods for determining the heat resistance of patent leather. Method A makes use of a modified lastometer, while Method B uses the "Zwik" apparatus. Both methods are applicable to patent leathers for all end uses.

Cuir — Essais physiques et mécaniques — Détermination de la résistance à la chaleur des cuirs vernis

ISO 17232:2017 spécifie deux méthodes permettant de déterminer la résistance à la chaleur du cuir vernis. La méthode A met en ?uvre un lastomètre modifié, tandis que la méthode B utilise l'appareillage Zwik. Ces deux méthodes sont applicables aux cuirs vernis quelles que soient leurs utilisations finales.

General Information

Status
Not Published
Current Stage
5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
Start Date
16-Sep-2025
Completion Date
16-Sep-2025
Ref Project

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Standards Content (Sample)


FINAL DRAFT
International
Standard
ISO/FDIS 17232
IUP 38
IULTCS
Leather — Physical and mechanical
Voting begins on:
tests — Determination of heat
2025-09-16
resistance of patent leather
Voting terminates on:
2025-11-11
Cuir — Essais physiques et mécaniques — Détermination de la
résistance à la chaleur des cuirs vernis
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
ISO/CEN PARALLEL PROCESSING 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
IUP 38:2025(en) © ISO 2025
FINAL DRAFT
International
Standard
ISO/FDIS 17232
IUP 38
IULTCS
Leather — Physical and mechanical
Voting begins on:
tests — Determination of heat
resistance of patent leather
Voting terminates on:
Cuir — Essais physiques et mécaniques — Détermination de la
résistance à la chaleur des cuirs vernis
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 2025
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
ISO/CEN PARALLEL PROCESSING
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Reference number
Published in Switzerland ISO/FDIS 17232:2025(en)
IUP 38:2025(en) © ISO 2025
ii
IUP 38:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Method A — Lastometer method . 1
4.1 Principle .1
4.2 Apparatus .1
4.3 Specimen and test piece preparation .2
4.4 Procedure .2
4.5 Test report .3
5 Method B — Zwik method . 3
5.1 Principle .3
5.2 Apparatus .3
5.3 Specimen and test piece preparation .5
5.4 Procedure .5
5.5 Test report .5
Annex A (informative) Sources of apparatus . 7

iii
IUP 38:2025(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 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.
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 38 published in J. Soc. Leather Tech. Chem., 84 (7), p. 403, 2000, and declared an official
method of the IULTCS in March 2001.
This third edition cancels and replaces the second edition (ISO 17232:2017), which has been technically
revised.
The main changes are as follows:
— alignment with the changes and revised terminology in ISO 2418 and ISO 2419;
— modification of the testing conditions (4.3 and 5.3).
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
FINAL DRAFT International Standard
IUP 38:2025(en)
Leather — Physical and mechanical tests — Determination of
heat resistance of patent leather
1 Scope
This document specifies two methods for determining the heat resistance of patent leather.
Method A makes use of a modified lastometer, while Method B uses the “Zwik” apparatus. Both methods are
applicable to patent leathers for all end uses.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 2418, Leather — Chemical, physical, mechanical and fastness tests — Position and preparation of specimens
for testing
ISO 2419, Leather — Physical and mechanical tests — Specimen and test piece conditioning
ISO 15115, Leather — Vocabulary
EN 15987, Leather — Terminology — Key definitions for the leather trade
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15987 and ISO 15115 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Method A — Lastometer method
4.1 Principle
A perforated test piece is distended by a specified amount. The surface is heated and any damage to the
patent finish is noted.
4.2 Apparatus
4.2.1 Test machine, including the parts described in 4.2.1.1 to 4.2.1.4.
NOTE An example of a suitable apparatus available commercially is given in Annex A.
4.2.1.1 Clamp, capable of holding the test piece around its edge leaving free a central circular area
of diameter (25,0 ± 0,1) mm. The design of its clamping system shall ensure that the test piece does not

IUP 38:2025(en)
slip under the test conditions and neither stretches nor compresses the central area as it is clamped. The
boundary between the free and clamped area shall be sharply defined.
4.2.1.2 Plunger, terminating in a steel ball of diameter (21,0 ± 0,1) mm.
4.2.1.3 Mechanism for thrusting the steel ball, without rotation against the test piece.
4.2.1.4 Mechanism for monitoring the distension of the test piece, (travel from zero) to an accuracy of
±0,05 mm.
4.2.2 Press knife, conforming to the requirements of ISO 2419 for cutting test pieces of suitable
dimensions for the test machine.
4.2.3 Sewing machine needle, sharp and undamaged, PCL size 80, either fitted into holder suitable for
use by hand or into sewing machine.
NOTE Other sized needles are used if they are more appropriate to the sewing used in the shoe production.
4.2.4 Hot air blower, capable of maintaining a temperature of (100 ± 5) °C or (125 ± 5) °C.
4.2.5 Temperature measuring device, reading to 1 °C.
4.2.6 Stopwatch, reading to 1 s.
4.2.7 Soft rubber mat, minimum thickness 10 mm.
4.3 Specimen and test piece preparation
4.3.1 Select the specimen in accordance with ISO 2418. Cut three test pieces by applying the press knife
(4.2.2) to the patent surface.
If there is a requirement for two or more hides or skins to be tested in one batch, then only one or two test
pieces need to be taken from each hide or skin, provided that the overall total is not less than three test pieces.
4.3.2 If the test piece is to be perforated by hand, place the test piece on the soft rubber mat (4.2.7) with
the patent surface uppermost. Using the sewing machine needle (4.2.3) fitted into a holder, pierce a hole
vertically through the centre of the test piece so that the hole is within 1,0 mm of the centre. Pierce four
further holes through the test piece with each hole (5,0 ± 0,5) mm from the first hole so that the first holes
form a simple (Greek) cross. Ensure that the needle penetrates through the leather into the soft rubber mat.
4.3.3 If the test piece is to be perforated by machine, perforate through the centre using the needle fitted
into a sewing machine (4.2.3) running at normal speed but without the thread and set at 6 stitches/10 mm.
4.3.4 Condition the test piece in accordance with ISO 2419 and, if removed from the conditioning
atmosphere, the test procedure shall be started within 10 min. There is no need to carry out the test (4.4) in
a conditioned atmosphere.
4.4 Procedure
4.4.1 Set the instrument so that the plunger (4.2.1.2) is set at zero or minimum distension.
4.4.2 Tightly clamp the test piece into the instrument so that the ball end of the plunger (4.2.1.2) acts on
the reverse side of the test piece.
...


IUP 38
ISO/IULTCS SC ##/WG #
Secretariat: ISO
Date: 2025-07-1409-01
Leather — Physical and mechanical tests — Determination of heat
resistance of patent leather
Cuir — Essais physiques et mécaniques — Détermination de la résistance à la chaleur des cuirs vernis
FDIS stage
ISO #####-#:####(X/FDIS 17232:2025(en)
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: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO #### 2025 – All rights reserved
ii
IUP 38:2025(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Method A — Lastometer method . 1
4.1 Principle . 1
4.2 Apparatus . 1
4.3 Specimen and test piece preparation . 2
4.4 Procedure . 2
4.5 Test report . 3
5 Method B — Zwik method . 3
5.1 Principle . 3
5.2 Apparatus . 3
5.3 Specimen and test piece preparation . 6
5.4 Procedure . 6
5.5 Test report . 6
Annex A (informative) Sources of apparatus . 8

iii
ISO #####-#:####(X/FDIS 17232:2025(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 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'sISO’s adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
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 38 published in J. Soc. Leather Tech. Chem., 84 (7), p. 403, (2000),, and declared an official
method of the IULTCS in March 2001.
This third edition cancels and replaces the second edition (ISO 17232:2017), which has been technically
revised.
The main changes are as follows:
— — alignment with the changes and revised terminology in ISO 2418:2023 and ISO 2419:2024;
— — modification of the testing conditions (4.3(4.3 and 5.35.3).).
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.
© ISO #### 2025 – All rights reserved
iv
FINAL DRAFT International Standard ISO/FDIS 17232:2025(en)
IUP 38:2025(en)
Leather — Physical and mechanical tests — Determination of heat
resistance of patent leather
1 Scope
This document specifies two methods for determining the heat resistance of patent leather.
Method A makes use of a modified lastometer, while Method B uses the “Zwik” apparatus. Both methods are
applicable to patent leathers for all end uses.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 2418:2023, Leather — Chemical, physical, mechanical and fastness tests — Position and preparation of
specimens for testing
ISO 2419:2024, Leather — Physical and mechanical tests — Specimen and test piece conditioning
ISO 15115, Leather — Vocabulary
EN 15987, Leather — Terminology — Key definitions for the leather trade
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15987 and ISO 15115 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
4 Method A — Lastometer method
4.1 Principle
A perforated test piece is distended by a specified amount. The surface is heated and any damage to the patent
finish is noted.
4.2 Apparatus
4.2.1 4.2.1 Test machine, including the parts described in 4.2.1.14.2.1.1 to 4.2.1.44.2.1.4.
NOTE An example of a suitable apparatus available commercially is given in Annex AAnnex A.
4.2.1.1 4.2.1.1 Clamp, capable of holding the test piece around its edge leaving free a central
circular area of diameter (25,0 ± 0,1) mm. The design of its clamping system shall ensure that the test piece
does not slip under the test conditions and neither stretches nor compresses the central area as it is clamped.
The boundary between the free and clamped area shall be sharply defined.
4.2.1.2 4.2.1.2 Plunger, terminating in a steel ball of diameter (21,0 ± 0,1) mm.
4.2.1.3 4.2.1.3 Mechanism for thrusting the steel ball, without rotation against the test
piece.
4.2.1.4 4.2.1.4 Mechanism for monitoring the distension of the test piece, (travel from
zero) to an accuracy of ±0,05 mm.
4.2.2 4.2.2 Press knife, conforming to the requirements of ISO 2419:2024 for cutting test pieces of
suitable dimensions for the test machine.
4.2.3 4.2.3 Sewing machine needle, sharp and undamaged, PCL size 80, either fitted into holder suitable
for use by hand or into sewing machine.
NOTE Other sized needles are used if they are more appropriate to the sewing used in the shoe production.
4.2.4 4.2.4 Hot air blower, capable of maintaining a temperature of (100 ± 5) °C or (125 ± 5) °C.
4.2.5 4.2.5 Temperature measuring device, reading to 1 °C.
4.2.6 4.2.6 Stopwatch, reading to 1 s.
4.2.7 4.2.7 Soft rubber mat, minimum thickness 10 mm.
4.3 Specimen and test piece preparation
4.3.1 4.3.1 Select the specimen in accordance with ISO 2418:2023. Cut three test pieces by applying the
press knife (4.2.2(4.2.2)) to the patent surface.
If there is a requirement for two or more hides or skins to be tested in one batch, then only one or two test
pieces need to be taken from each hide or skin, provided that the overall total is not less than three test pieces.
4.3.2 4.3.2 If the test piece is to be perforated by hand, place the test piece on the soft rubber mat
(4.2.7(4.2.7)) with the patent surface uppermost. Using the sewing machine needle (4.2.3(4.2.3)) fitted into
a holder, pierce a hole vertically through the centre of the test piece so that the hole is within 1,0 mm of the
centre. Pierce four further holes through the test piece with each hole (5,0 ± 0,5) mm from the first hole so
that the first holes form a simple (Greek) cross. Ensure that the needle penetrates through the leather into the
soft rubber mat.
4.3.3 4.3.3 If the test piece is to be perforated by machine, perforate through the centre using the needle
fitted into a sewing machine (4.2.3(4.2.3)) running at normal speed but without the thread and set at
6 stitches/10 mm.
4.3.4 4.3.4 Condition the test piece in accordance with ISO 2419:2024 and, if removed from the
conditioning atmosphere, the test procedure shall be started within 10 min. There is no need to carry out the
test (4.4(4.4)) in a conditioned atmosphere.
4.4 Procedure
4.4.1 4.4.1 Set the instrument so that the plunger (4.2.1.2(4.2.1.2)) is set at zero or minimum distension.
4.4.2
4.4.34.4.2 4.4.2 Tightly clamp the test piece into the instrument so that the ball end of the
plunger (4.2.1.2(4.2.1.2)) acts on the reverse side of the test piece.
© ISO #### 2025 – All rights reserved
IUP 38:2025(en)
4.4.44.4.3 4.4.3 Force the ball end of the plunger into the test piece until the test piece is
distended by (7,5 ± 0,05) mm as shown on the distension scale (4.2.1.4(4.2.1.4).). Examine the test piece and
note any damage.
4.4.54.4.4 4.4.4 Place the sensor of the temperature measuring device (4.2.5(4.2.5)) at a
distance of (1,5 ± 0,5) mm above the dome of the distended test piece. Using the hot air blower (4.2.4(4.2.4),),
raise the temperature of the test piece to (100 ± 5) °C for (180 ± 5) s for the standard test conditions or to
(125 ± 5) °C for (300 ± 5) s for the extended test conditions. Check the temperature using the temperature
measuring device (4.2.5(4.2.5)) and maintain this temperature for the time given above. If the temperature
goes out of the limits, reject the test piece and repeat using a fresh test piece.
4.4.64.4.5 4.4.5 Maintain the test piece in the distended state and re-examine. Record any
damage to the patent finish or the leather grain.
4.4.74.4.6 4.4.6 Repeat steps 4.4.14.4.1 to 4.4.54.4.5 for the remaining test pieces.
4.5 Test report
The test report shall include the following:
a) a) a reference to this document, i.e. ISO 17232:20XX;:—;
b) b) a reference to the method used;
c) c) details of any damage to the patent finish or leather grain when the test piece is first distended;
d) d) details of any damage to the patent finish or leather grain when the test piece is heated;
e) e) the test temperature and time (i.e. 100 °C for 180 s or 125 °C for 300 s);
f) f) the standard atmosphere used for conditioning as given in ISO 2419:2024;
g) g) any deviations from the method specified in this document;
h) h) full details for identification of the specimen and any deviations from ISO 2418:2023 with
respect to specimen preparation;
i) any unusual features observed;
h)j) the date of the test.
5 Method B — Zwik method
5.1 Principle
A perforated test piece is distended by a specified amount. The surface is heated and any dama
...


PROJET FINAL
Norme
internationale
ISO/FDIS 17232
IUP 38
IULTCS
Cuir — Essais physiques et
Début de vote:
mécaniques — Détermination de
2025-09-16
la résistance à la chaleur des cuirs
Vote clos le:
vernis
2025-11-11
Leather — Physical and mechanical tests — Determination of
heat resistance of patent leather
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
IUP 38:2025(fr) © ISO 2025
PROJET FINAL
Norme
internationale
ISO/FDIS 17232
IUP 38
IULTCS
Cuir — Essais physiques et
Début de vote:
mécaniques — Détermination
2025-09-16
de la résistance à la chaleur des
Vote clos le:
cuirs vernis
2025-11-11
Leather — Physical and mechanical tests — Determination of
heat resistance of patent leather
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Numéro de référence
Publié en Suisse ISO/FDIS 17232:2025(fr)
IUP 38:2025(fr) © ISO 2025
ii
IUP 38:2025(fr)
Sommaire Page
Avant propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Méthode A — Méthode avec lastomètre . 1
4.1 Principe .1
4.2 Appareillage .1
4.3 Mode opératoire .2
4.4 Rapport d’essai .3
5 Méthode B — Méthode avec l’appareillage Zwik . 3
5.1 Principe .3
5.2 Appareillage .4
5.3 Échantillon et préparation de l’éprouvette .5
5.4 Mode opératoire .6
5.5 Rapport d’essai .6
Annexe A (informative) Provenance de l’appareillage . 7

iii
IUP 38:2025(fr)
Avant propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux
de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l’ISO participent également aux travaux. L’ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Le présent document a été rédigé conformément aux règles de rédaction données dans les Directives ISO/
IEC, Partie 2 (voir www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de brevet revendiqué à cet égard. À la date de publication du présent document, l’ISO n’avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l’adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l’ISO liés à l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion de
l’ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
L’IULTCS est une organisation mondiale de sociétés professionnelles des industries du cuir fondée en 1897,
ayant pour mission de favoriser les progrès des sciences et technologies du cuir. L’IULTCS comprend trois
commissions qui sont responsables de l’établissement des méthodes internationales d’échantillonnage et
d’essai des cuirs. L’ISO reconnaît l’IULTCS en tant qu’organisme international à activités normatives pour
l’élaboration de méthodes d’essai relatives au cuir.
Le présent document a été élaboré par la Commission des essais physiques de l’Union internationale des
sociétés de techniciens et chimistes du cuir (commission IUP, IULTCS), en collaboration avec le comité
technique CEN/TC 289, Cuir, du Comité européen de normalisation (CEN), conformément à l’Accord de
coopération technique entre l’ISO et le CEN (Accord de Vienne).
Il est fondé sur le document IUP 38, publié dans le J. Soc. Leather Tech. Chem., 84 (7), p. 403, (2000) et déclaré
méthode officielle de l’IULTCS en mars 2001.
Cette troisième édition annule et remplace la deuxième édition (ISO 17232:2017), qui a fait l’objet d’une
révision technique, avec les changements suivants:
— mise en cohérence avec les modifications et la révision terminologique effectuées dans l’ISO 2418 et dans
l’ISO 2419;
— modification des conditions d’essai (4.3 et 5.3).
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l’adresse www.iso.org/members.html.

iv
PROJET FINAL Norme internationale
IUP 38:2025(fr)
Cuir — Essais physiques et mécaniques — Détermination de
la résistance à la chaleur des cuirs vernis
1 Domaine d’application
Le présent document spécifie deux méthodes permettant de déterminer la résistance à la chaleur du cuir vernis.
La méthode A met en œuvre un lastomètre modifié, tandis que la méthode B utilise l’appareillage Zwik. Ces
deux méthodes sont applicables aux cuirs vernis quelles que soient leurs utilisations finales.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique. Pour
les références non datées, la dernière édition du document de référence s’applique (y compris les éventuels
amendements).
ISO 2418, Cuir — Essais chimiques, physiques, mécaniques et essais de solidité — Emplacement et préparation
des spécimens pour les essais
ISO 2419, Cuir — Essais physiques et mécaniques — Conditionnement des spécimens et des éprouvettes
ISO 15115, Cuir — Vocabulaire
EN 15987, Cuir — Terminologie — Définitions pour le commerce du cuir
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions donnés dans l’EN 15987 et dans
l’ISO 15115 s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l’adresse https:// www .electropedia .org/
4 Méthode A — Méthode avec lastomètre
4.1 Principe
Une éprouvette perforée est soumise à un étirement d’une longueur spécifiée. Sa surface est chauffée et tout
endommagement de la finition vernie est noté.
4.2 Appareillage
4.2.1 Machine d’essai, comprenant les parties décrites en 4.2.1.1 à 4.2.1.4.
NOTE Un exemple d’appareillage approprié disponible dans le commerce est donné à l’Annexe A.

IUP 38:2025(fr)
4.2.1.1 Mâchoire, pouvant maintenir les bords de l’éprouvette en laissant au centre de celle-ci une surface
circulaire libre de (25,0 ± 0,1) mm de diamètre. Le système de serrage doit être conçu de façon à garantir
que l’éprouvette ne glissera pas dans les conditions d’essai, et qu’il n’étirera pas, ni ne comprimera la zone
centrale de l’éprouvette une fois cette dernière fixée. La limite entre la surface libre et celle serrée dans le
dispositif doit être clairement définie.
4.2.1.2 Piston, dont une extrémité est constituée d’une bille d’acier de (21,0 ± 0,1) mm de diamètre.
4.2.1.3 Mécanisme de propulsion de la bille d’acier, sans rotation contre l’éprouvette.
4.2.1.4 Mécanisme de contrôle de l’étirement de l’éprouvette (course depuis le zéro), d’une exactitude
de ±0,05 mm.
4.2.2 Emporte-pièce, conforme aux exigences de l’ISO 2419 pour découper des éprouvettes de
dimensions adaptées à la machine d’essai.
4.2.3 Aiguille de machine à coudre, bien aiguisée et sans défaut, de type PCL 80, montée sur un support
utilisable à la main ou sur une machine à coudre.
NOTE Il est possible d’employer des aiguilles de taille différente si elles conviennent mieux aux coutures utilisées
dans la fabrication des chaussures.
4.2.4 Ventilateur à air chaud, pouvant maintenir une température de (100 ± 5) °C ou de (125 ± 5) °C.
4.2.5 Dispositif de mesurage de la température, d’une exactitude de 1 °C.
4.2.6 Chronomètre, d’une exactitude de 1 s.
4.2.7 Tapis de caoutchouc souple, d’une épaisseur minimale de 10 mm.
4.3.1 Sélectionner l’échantillon conformément à l’ISO 2418. Découper trois éprouvettes en appliquant
l’emporte-pièce (4.2.2) sur la surface vernie.
S’il existe une exigence de mise à l’essai de plus de deux peaux par lot, ne prélever qu’une ou deux éprouvettes
par peau, à condition que le total ne soit pas inférieur à trois éprouvettes.
4.3.2 Si l’éprouvette doit être perforée à la main, la placer sur le tapis de caoutchouc souple (4.2.7) en
orientant la surface vernie vers le haut. Utiliser l’aiguille de machine à coudre (4.2.3) montée sur le support
pour percer un trou verticalement au milieu de l’éprouvette de sorte qu’il se situe à moins de 1,0 mm du
centre. Percer l’éprouvette de quatre autres trous, situés chacun à (5,0 ± 0,5) mm du premier trou, ces quatre
trous formant une simple croix (croix grecque). Vérifier que l’aiguille traverse le cuir et pénètre dans le tapis
de caoutchouc souple.
4.3.3 S
...

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