ISO/FDIS 17186

• Abstract:

  ISO 17186:2011 specifies a method for determining the thickness of the surface coating applied to leather when measured under zero compression. It is applicable to all types of leather.

• Status: Not Published
• ICS: 59.140.30 - Leather and furs
• Technical Committee: IULTCS - International Union of Leather Technologists and Chemists Societies
• Drafting Committee: IULTCS - International Union of Leather Technologists and Chemists Societies
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 16-Sep-2026
• Completion Date: 16-Sep-2026

• Consolidates: FprEN ISO 17186 - Leather - Physical and mechanical tests - Determination of surface coating thickness (ISO/FDIS 17186:2026)
• Effective Date: 12-Feb-2026
• Consolidates: ISO 18674-8:2023 - Geotechnical investigation and testing — Geotechnical monitoring by field instrumentation — Part 8: Measurement of loads: Load cells
• Effective Date: 16-Oct-2025
• Revises: ISO 17186:2011 - Leather — Physical and mechanical tests — Determination of surface coating thickness
• Effective Date: 16-Oct-2025

ISO/FDIS 17186 is a draft International Standard from ISO for determining the thickness of the surface coating applied to leather under zero compression. It applies to all types of leather and gives laboratories and quality teams a repeatable way to measure coating thickness and report the result in micrometres.

The document sets out the measurement principle, the apparatus, sampling and test piece preparation, two alternative procedures, the way results are expressed, and what the test report shall include.

What does ISO/FDIS 17186 specify?

ISO/FDIS 17186 specifies a microscope-based method for measuring the thickness of a leather surface coating when the sample is not compressed. The result can also be expressed as coating thickness relative to total leather thickness if that is required.

The document is organized into nine clauses:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Principle
• Clause 5 - Apparatus
• Clause 6 - Sampling and test piece preparation
• Clause 7 - Procedure, including Method A and Method B
• Clause 8 - Expression of results
• Clause 9 - Test report

Clause 7 gives two ways to carry out the measurement: Method A, based on single values at equidistant positions, and Method B, based on parallel lines. Both methods can be used with a light microscope or a scanning electron microscope.

What are the key requirements of ISO/FDIS 17186?

ISO/FDIS 17186 focuses on preparing a clean cross-section of leather, calibrating the measuring system, and taking repeatable measurements across several test pieces. The practical goal is to make the coating thickness result traceable and comparable between laboratories.

Sampling and preparation

Clause 6 requires sampling in accordance with ISO 2418 and conditioning in accordance with ISO 2419. Three test pieces are cut and sectioned perpendicular to the leather surface. In practice, that means the cut face must show the coating and the leather body clearly enough for measurement.

Apparatus and magnification

Clause 5 lists a light microscope or scanning electron microscope, a razor blade, a calibration grid, and, for SEM use, a coating unit and specimen stubs. The microscope setup must be suitable for the expected coating thickness, and thin coatings need a smaller field of view or SEM use. This matters because the image must resolve the coating edge clearly enough for a reliable reading.

Method A and Method B

Clause 7 says Method A should be preferred. Method A takes several single readings at spaced positions and allows statistical evaluation such as standard deviation. Method B uses parallel lines or graduations and is simpler, but the manual positioning means a statistical evaluation is not possible in the same way.

Calibration

Clause 7 requires calibration of the measuring system with the grid at each magnification used. For SEM work, the working distance and acceleration voltage used for calibration must match those used for the sample. This helps avoid scale errors between calibration and measurement.

Number of measurements and calculation

Method A requires at least six measurements on each section, across three sections. Method B measures each section once, then averages the three results. Clause 8 gives the calculation for coating percentage relative to total leather thickness when that value is needed.

Reporting

Clause 9 requires the report to identify the standard used, the method chosen, the mean coating thickness, the mean total thickness if measured, any percentage value, any standard deviation if calculated, the conditioning atmosphere from ISO 2419, deviations from the method, sampling details, and the test date.

What terms does ISO/FDIS 17186 define?

ISO/FDIS 17186 uses these key terms in its procedure:

• Surface coating thickness - the thickness of the coating applied to the leather surface, measured on a section of the sample.
• Zero compression - the measuring condition where the sample is not compressed during thickness determination.
• Method A - the procedure based on single measurements at equidistant positions, used when statistical evaluation is needed.
• Method B - the procedure based on parallel lines or graduations, used when a simpler reading method is acceptable.
• Scanning electron microscope (SEM) - an alternative microscope for very thin coatings and fine cross-sections.
• Standard deviation - the spread of repeated coating-thickness readings when Method A is used.
• Conditioning - bringing specimens to the atmosphere specified in ISO 2419 before testing.

Who uses ISO/FDIS 17186?

ISO/FDIS 17186 is used by leather test laboratories, tanneries, quality control teams, and buyers or specifiers who need an objective coating-thickness result. It is relevant for incoming inspection, supplier comparison, product verification, and test reporting for coated leather.

What changed in ISO/FDIS 17186 from the previous edition?

ISO/FDIS 17186 is the third edition and replaces ISO 17186:2011. The changes stated in the document are an update of the normative references and an update of the terminology.

Which standards are used with ISO/FDIS 17186?

• ISO 2418 - gives the rules for the position and preparation of specimens for testing.
• ISO 2419 - gives the conditioning requirements for specimens and test pieces before testing.

What does the ISO/FDIS 17186 document contain?

ISO/FDIS 17186 contains a principle statement, an apparatus list, and step-by-step procedures for preparing and sectioning leather samples. It includes figures showing the measurement principles for Method A and Method B, and it describes three microscope-based ways of reading the coating thickness, including computer-assisted, graduated-scale, and photographic approaches.

The document also gives the calculation steps for averaging results, rounding them for reporting, and calculating coating percentage when needed. Clause 9 provides a reporting checklist so the test record captures the method, sample identification, conditioning atmosphere, deviations, and date.

FINAL DRAFT
International
Standard
ISO/FDIS 17186
IUP 41
IULTCS
Leather — Physical and mechanical
Voting begins on:
tests — Determination of surface
2026-09-16
coating thickness
Voting terminates on:
2026-11-11
Cuir — Essais physiques et mécaniques — Détermination de
l'épaisseur du revêtement de surface
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 41:2026(en) © ISO 2026
FINAL DRAFT
IUP 41:2026(en) International
Standard
ISO/FDIS 17186
IUP 41
IULTCS
Leather — Physical and mechanical
Voting begins on:
tests — Determination of surface
coating thickness
Voting terminates on:
Cuir — Essais physiques et mécaniques — Détermination de
l'épaisseur du revêtement de surface
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
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: [phone]
Email: [e-mail]
Website: www.iso.org
Reference number
Published in Switzerland ISO/FDIS 17186:2026(en)
IUP 41:2026(en) © ISO 2026
ii
IUP 41:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Sampling and test piece preparation . 2
7 Procedure . 2
7.1 General descriptions .2
7.1.1 Principles of measurement .2
7.1.2 Magnification and calibration .3
7.2 Method A — Based on the measurement of single values on equidistant positions.3
7.2.1 Measurement using measuring marks of a suitable computer program as
analysis unit of the microscope.3
7.2.2 Measurement using a light microscope fitted with a graduated scale .4
7.3 Method B — Based on a measurement using parallel lines .5
7.3.1 Measurement using measuring lines of a suitable computer program as analysis
unit of the microscope .5
7.3.2 Measurement using a light microscope fitted with a graduated scale .6
7.3.3 Measurement using a microscope fitted with a means of obtaining photographs .6
8 Expression of results . 7
9 Test report . 7

iii
IUP 41:2026(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.
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).
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 third edition cancels and replaces the second edition (ISO 17186:2011), which has been technically
revised.
The main changes are as follows:
— update of normative references;
— update of terminology.
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 41:2026(en)
Leather — Physical and mechanical tests — Determination of
surface coating thickness
1 Scope
This document specifies a method for determining the thickness of the surface coating applied to leather
when measured under zero compression. It is applicable to all types of leather.
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
3 Terms and definitions
No terms and definitions are listed in this document.
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 Principle
A section of leather is taken perpendicular to the coated surface. The thickness of the surface coating is
measured using a microscope and expressed as an absolute thickness. The coating thickness as a percentage
of the total thickness of the leather can be reported, if required.
5 Apparatus
5.1 Light microscope or scanning electron microscope, which can be operated with an object-field size
of 1 mm × 1 mm, or lower, and is
— fitted with a camera-image unit connected to a computer [resolution of at least (500 × 500) pixels], or
— fitted with a photographical unit, or
— equipped with an eyepiece with a graduated scale (at least 100 scale marks).
NOTE 100 scale marks correspond to a scaling of 10 µm in the object-field dimension for an object-field size of
1 mm × 1 mm.
For measurement of coating thicknesses of less than 50 µm, an object-field size of 0,4 mm × 0,4 mm or lower
shall be used. For measurement of values of less than 15 µm, a scanning electron microscope with a suitable
object-field dimension should be used.

IUP 41:2026(en)
5.2 Razor blade.
5.3 Grid or similar calibration device, reading to at least 10 µm and suitable for use in the light
microscope or scanning electron microscope.
5.4 Coating unit, using sputter or evaporation, including a suitable element or alloy (e.g. gold) for coating,
if a scanning electron microscope is used.
5.5 Specimen stubs, suitable for a scanning electron microscope.
6 Sampling and test piece preparation
6.1 Sample in accordance with ISO 2418. Condition in accordance with ISO 2419.
6.2 Cut three test pieces of approximately 10 mm × 10 mm. If there is a requirement for more than two
hides or skins to be tested in one batch, then only one test piece need be taken from each hide or skin,
provided that the overall total is not less than three pieces. Section each of the three test pieces as described
in 6.3.
6.3 Place the cutting edge of the razor blade (5.2) on the flesh side, with the blade perpendicular to the
leather surface, and pres
...

IUP 41:2026(en)
IULTCS
Secretariat: ISO
Date: 2026-07-2709-01
Leather — Physical and mechanical tests — Determination of surface
coating thickness
Cuir — Essais physiques et mécaniques — Détermination de l'épaisseur du revêtement de surface
FDIS stage
TThhiiss dr draaftft i is s susubbmmiitttteed d ttoo aa ppaarraallellel l vvoottee i inn IISSOO,, CCEEN.N.

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
IUP 41:2026(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Sampling and test piece preparation . 2
7 Procedure . 2
7.1 General descriptions . 2
7.2 Method A — Based on the measurement of single values on equidistant positions . 4
7.3 Method B — Based on a measurement using parallel lines. 6
8 Expression of results . 8
9 Test report . 8

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'sISO’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 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).
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 third edition cancels and replaces the second edition (ISO 17186:2011), which has been technically
revised.
The main changes are as follows:
— — update of normative references;
— — update of terminology.
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 ISO/FDIS 17186:2026(en)
IUP 41:2026(en)
Leather — Physical and mechanical tests — Determination of surface
coating thickness
1 Scope
This document specifies a method for determining the thickness of the surface coating applied to leather when
measured under zero compression. It is applicable to all types of leather.
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
3 Terms and definitions
No terms and definitions are listed in this document.
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 Principle
A section of leather is taken perpendicular to the coated surface. The thickness of the surface coating is
measured using a microscope and expressed as an absolute thickness. The coating thickness as a percentage
of the total thickness of the leather can be reported, if required.
5 Apparatus
5.1 5.1 Light microscope or scanning electron microscope, which can be operated with an object-
field size of 1 mm × 1 mm, or lower, and is
— — fitted with a camera-image unit connected to a computer ([resolution of at least (500 × 500) pixels),],
or
— — fitted with a photographical unit, or
— — equipped with an eyepiece with a graduated scale (at least 100 scale marks).
NOTE 100 scale marks correspond to a scaling of 10 µm in the object-field dimension for an object-field size of
1 mm × 1 mm.
For measurement of coating thicknesses of less than 50 µm, an object-field size of 0,4 mm × 0,4 mm or lower
shall be used. For measurement of values of less than 15 µm, a scanning electron microscope with a suitable
object-field dimension should be used.
5.2 5.2 Razor blade.
5.3 5.3 Grid or similar calibration device, reading to at least 10 µm and suitable for use in the light
microscope or scanning electron microscope.
5.4 5.4 Coating unit, using sputter or evaporation, including a suitable element or alloy (e.g. gold) for
coating, if a scanning electron microscope is used.
5.5 5.5 Specimen stubs, suitable for a scanning electron microscope.
6 Sampling and test piece preparation
6.1 6.1 Sample in accordance with ISO 2418. Condition in accordance with ISO 2419.
6.2 6.2 Cut three test pieces of approximately 10 mm × 10 mm. If there is a requirement for more than
two hides or skins to be tested in one batch, then only one test piece need be taken from each hide or skin,
provided that the overall total is not less than three pieces. Section each of the three test pieces as described
in 6.36.3.
6.3 6.3 Place the cutting edge of the razor blade (5.2(5.2)) on the flesh side, with the blade
perpendicular to the leather surface, and press the blade through the whole thickness of the leather, ensuring
that the blade remains vertical. It is recommended that a new razor blade be used for each section.
If using a scanning electron microscope, stick a section prepared as described above onto a specimen stub
(5.5(5.5)) with the cut surface uppermost. Coat the stub and section in the coating unit (5.4(5.4)) so that a
sufficient image quality can be obtained.
7 Procedure
7.1 General descriptions
7.1.1 Principles of measurement
This document describes two basic principles to measure the surface coating thickness.
Method A is based on the measurement of a number of values on equidistant positions (see
Figure 1Figure 1).). It enables the determination of a standard deviation as well as a confidence interval.
Method B is based on a measurement using parallel lines (see Figure 2Figure 2).). A statistical evaluation of
the results is not possible due to the fact that the operator has to position the graduation of the grid between
peaks and troughs manually. This process already includes a calculation of the average.
Method A should be preferred.
Methods A and B can be used for light microscopes as well as for scanning electron microscopes. The working
distance and the acceleration voltage of the scanning electron microscope shall be the same for calibration
and measurement of the sample.
IUP 41:2026(en)
Key
1 leather
2 coating
3 equidistant single measurement
Figure 1 — Principle of method A
Key
1 leather
2 coating
3 graduated scale or parallel lines
Figure 2 — Principle of method B
7.1.2 Magnification and calibration
Due to the variation in the typical thickness of surface coating (e.g. 10 µm to 200 µm) and the total thickness
of leather (e.g. 800 µm to 3 000 µm), it is usually necessary to use different magnifications of the mi
...

PROJET FINAL
Norme
internationale
ISO/FDIS 17186
IUP 41
IULTCS
Cuir — Essais physiques et
Début de vote:
mécaniques — Détermination
2026-09-16
de l'épaisseur du revêtement de
Vote clos le:
surface
2026-11-11
Leather — Physical and mechanical tests — Determination of
surface coating thickness
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 41:2026(fr) © ISO 2026
PROJET FINAL
IUP 41:2026(fr) Norme
internationale
ISO/FDIS 17186
IUP 41
IULTCS
Cuir — Essais physiques et
Début de vote:
mécaniques — Détermination
2026-09-16
de l'épaisseur du revêtement de
Vote clos le:
surface
2026-11-11
Leather — Physical and mechanical tests — Determination of
surface coating thickness
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
LES DESTINATAIRES DU PRÉSENT PROJET SONT
Tous droits réservés.
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
La présente publication de l’ISO est protégée par le droit d’auteur et demeure la propriété de l’ISO et/ou de ses concédants de
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
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Numéro de référence
Publié en Suisse
IUP 41:2026(fr) © ISO 2026
ii
IUP 41:2026(fr)
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Principe. 1
5 Appareillage . 1
6 Échantillonnage et préparation des éprouvettes . 2
7 Mode opératoire . 2
7.1 Généralités .2
7.1.1 Principes de mesure .2
7.1.2 Grossissement et étalonnage .3
7.2 Méthode A — Fondée sur le mesurage de valeurs individuelles sur des positions
équidistantes.3
7.2.1 Mesurage fondé sur l’utilisation des repères de mesure d’un programme
informatique adapté comme unité d’analyse du microscope .3
7.2.2 Mesurage à l’aide d’un microscope optique équipé d’une échelle graduée .4
7.3 Méthode B — Fondée sur l’utilisation de lignes parallèles pour le mesurage .5
7.3.1 Mesurage fondé sur l’utilisation des lignes de mesure d’un programme
informatique adapté comme unité d’analyse du microscope .5
7.3.2 Mesurage à l’aide d’un microscope optique équipé d’une échelle graduée .6
7.3.3 Mesurage à l’aide d’un microscope équipé d’un dispositif pour prendre des
photographies .6
8 Expression des résultats . 7
9 Rapport d’essai . 7

iii
IUP 41:2026(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.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. 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.
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 IUF, 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).
Fondée en 1897, l’IULTCS est une organisation mondiale de sociétés professionnelles des industries du
cuir ayant pour mission de favoriser l’avancement des sciences et technologies du cuir. L’IULTCS a trois
commissions, qui sont responsables de l’établissement de méthodes internationales d’échantillonnage et
d’essai du cuir. L’ISO reconnaît l’IULTCS en tant qu’organisme international à activités normatives pour
l’élaboration des méthodes d’essai relatives au cuir.
Cette troisième édition annule et remplace la deuxième édition (ISO 17186:2011), qui a fait l’objet d’une
révision technique.
Les principales modifications sont les suivantes:
— mise à jour des références normatives;
— mise à jour de la terminologie.
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/fr/members.html.

iv
PROJET FINAL Norme internationale
IUP 41:2026(fr)
Cuir — Essais physiques et mécaniques — Détermination de
l'épaisseur du revêtement de surface
1 Domaine d’application
Le présent document spécifie une méthode pour déterminer l’épaisseur du revêtement de surface appliqué
au cuir lorsque le mesurage s’effectue sous une pression nulle. Il s’applique à tous les types de cuir.
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
3 Termes et définitions
Aucun terme ni aucune définition ne sont définis dans le présent document.
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 Principe
Une section de cuir est prélevée perpendiculairement à la surface revêtue. L’épaisseur du revêtement de
surface est mesurée à l’aide d’un microscope et exprimée en épaisseur absolue. L’épaisseur du revêtement en
pourcentage de l’épaisseur totale du cuir peut être consignée, si nécessaire.
5 Appareillage
5.1 Microscope optique ou microscope électronique à balayage, pouvant être utilisé avec un champ
de balayage de 1 mm × 1 mm ou moins, et équipé:
— d’une unité de prise d’images reliée à un ordinateur (résolution d’au moins 500 × 500 pixels), ou
— d’une unité photographique, ou
— d’un oculaire de visée à échelle graduée (au moins 100 graduations).
NOTE 100 graduations correspondent à une échelle de 10 µm dans la dimension du champ objet pour un champ
de balayage de 1 mm × 1 mm.
IUP 41:2026(fr)
Pour le mesurage d’épaisseurs de revêtement inférieures à 50 µm, un champ de balayage de 0,4 mm × 0,4 mm
ou moins doit être utilisé. Pour le mesurage de valeurs inférieures à 15 µm, il est recommandé d’utiliser un
microscope électronique à balayage au champ de balayage adapté.
5.2 Lame de rasoir.
5.3 Grille ou dispositif d’étalonnage similaire, permettant une lecture à au moins 10 µm près, adaptés à
une utilisation dans le microscope optique ou le microscope électronique à balayage.
5.4 Unité d’enduction, par pulvérisation ou évaporation, comprenant un élément ou un alliage d’enduction
adapté (l’or, par exemple), si le microscope électronique à balayage est utilisé.
5.5 Embouts d’éprouvette, à utiliser avec le microscope électronique à balayage.
6 Échantillonnage et préparation des éprouvettes
6.1 Procéder à l’échantillonnage conforméme
...