prEN ISO 17186

SLOVENSKI STANDARD
01-april-2026
Usnje - Fizikalni in mehanski preskusi - Ugotavljanje debeline površinskih
premazov (ISO/DIS 17186:2026)
Leather - Physical and mechanical tests - Determination of surface coating thickness
(ISO/DIS 17186:2026)
Leder - Physikalische und mechanische Prüfungen - Bestimmung der Dicke der
Oberflächendeckschicht (ISO/DIS 17186:2026)
Cuir - Essais physiques et mécaniques - Détermination de l'épaisseur du revêtement de
surface (ISO/DIS 17186:2026)
Ta slovenski standard je istoveten z: prEN ISO 17186
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 17186
IUP 41
IULTCS
Leather — Physical and mechanical
Secretariat: ISO
tests — Determination of surface
coating thickness
Voting begins on:
2026-02-17
Cuir — Essais physiques et mécaniques — Détermination de
Voting terminates on:
l'épaisseur du revêtement de surface
2026-05-12
ICS: 59.140.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 17186:2026(en)
IUP 41:2026(en)
DRAFT
ISO/DIS 17186:2026(en)
International
IUP 41:2026(en)
Standard
ISO/DIS 17186
IUP 41
IULTCS
Leather — Physical and mechanical
Secretariat: ISO
tests — Determination of surface
coating thickness
Voting begins on:
Cuir — Essais physiques et mécaniques — Détermination de
Voting terminates on:
l'épaisseur du revêtement de surface
ICS: 59.140.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Reference number
Published in Switzerland ISO/DIS 17186:2026(en)
IUP 41:2026(en)
ii
ISO/DIS 17186:2026(en)
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
ISO/DIS 17186:2026(en)
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.
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 European Committee for Standardization (CEN) Technical Committee
CEN/TC 289, Leather, in collaboration with the Physical Test Commission of the International Union of
Leather Technologists and Chemists Societies (IUP Commission, IULTCS), in accordance with the Agreement
on technical cooperation between ISO and CEN (Vienna Agreement).
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
ISO/DIS 17186:2026(en)
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
has to be used. For measurement of values of less than 15 µm, a scanning electron microscope with a suitable
object-field dimension should be used.

ISO/DIS 17186:2026(en)
IUP 41:2026(en)
5.2 Razor blade.
5.3 Grid or similar calibration device, reading to at least 10 µm and suitable
...