ISO/FDIS 26082-1

IUP 53-1:2026(en)
ISO/IULTCS-IUP 53-1
Secretariat: ISO
Date: 2026-03-1704-23
Leather — Physical and mechanical test methods for the
determination of soiling — —
Part 1:
Rubbing (Martindale) method
Cuir — Méthodes d'essai physique et mécanique de détermination de la salissure —
Partie 1: Méthode par frottement (Martindale)
FDIS stage
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ii
IUP 53-1:2026(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus and materials . 2
6 Sampling and test piece preparation . 3
7 Pretreatment ageing procedures . 3
8 Procedure using a standard soiling cloth . 4
9 Cleaning after-treatment to evaluate residual soiling . 5
9.1 General instructions . 5
9.2 Manual cleaning . 5
9.3 Cleaning using a rub fastness tester . 5
10 Test report . 5
Annex A (informative) Sources of apparatus and materials . 7
Bibliography . 10

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
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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)
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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 sampling and the 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 Tests 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, the secretariat of which is
held by UNI, in accordance with the agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 26082-1:2019), which has been technically
revised.
The main changes are as follows:
— — the method was aligned to the latest versions of ISO 2418, ISO 2419, ISO 7906;
— the precision in Clause 7Clause 7 and Clause 8Clause 8 has been increased.
A list of all parts in the ISO 26082 series can be found on the ISO website.
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 26082-1:2026(en)
IUP 53-1:2026(en)
Leather — Physical and mechanical test methods for the
determination of soiling — —
Part 1:
Rubbing (Martindale) method
1 Scope
This document specifies a method for determining the resistance of all forms of leather to visible soiling
through repeated contact with soiled objects. It provides a physical pretreatment routine for leathers that can
be vulnerable to loss of soiling resistance while in service, prior to conducting further tests such as cleaning.
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 105--A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour
ISO 105--F09, Textiles — Tests for colour fastness — Part F09: Specification for cotton rubbing cloth
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 7906, Leather — Tests for colour fastness — General principles of testing
ISO 11640, Leather — Tests for colour fastness — Colour fastness to cycles of to-and-fro rubbing
ISO 12945--2, Textiles — Determination of fabric propensity to surface pilling, fuzzing or matting — Part 2:
Modified Martindale method
ISO 12947--1, Textiles — Determination of the abrasion resistance of fabrics by the Martindale method — Part 1:
Martindale abrasion testing apparatus
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1 3.1
soiling
change in colour of a leather test piece caused by rubbing a standard soiled fabric on the coated surface of the
leather
4 Principle
A test leather test piece is subjected to a rubbing-type soiling process under standard conditions and the
change in colour of the leather is evaluated.
A pretreatment to simulate wear or an after-treatment to test cleaning procedures, or both, are possible.
5 Apparatus and materials
Normal laboratory apparatus and, in particular, the following.
5.1 5.1 Martindale abrasion apparatus, as specified in ISO 12947-1.
5.2 5.2 Abrasion test piece holder heads, for the Martindale apparatus (5.1(5.1)) as specified in
ISO 12947-1. The holder shall be fitted with loading pieces so that the sum of the mass of the applied load and
the mass of the test piece holder assembly is (795 ± 10) g. This exerts a nominal pressure of 12 kPa on the test
piece during the test.
Use the abrasion option that forms a Lissajous figure with a (60 ± 1) mm stroke.
5.3 5.3 Pilling test piece holder heads, for the Martindale apparatus (5.1(5.1),), including the
auxiliary mandrel device for test piece mounting, as specified in ISO 12945-2. The pilling test piece holder
shall be fitted with ring weight and the nominal 12 kPa loading piece (as in 5.25.2),), so that the sum of the
mass of the applied load and the mass of the test piece holder assembly is (1 010 ± 15) g. This exerts a nominal
pressure of 1,6 kPa on the test piece during the test.
The use of the mandrel is necessary to correctly mount the soiling cloth on the holder and to avoid contact
with the soiling surface of the cloth.
Use the abrasion option that traces a Lissajous figure with a (60 ± 1) mm stroke. It should be noted that this
stroke differs from the standard machine setting for the textile pilling test.
NOTE This is not possible with all Martindale machines, particularly old machines.
5.4 5.4 Circular specimen cutters, for the test piece and soiling cloth. One cutter with a diameter of
at least 140 mm and another with a diameter of at least 38 mm.
5.5 5.5 Standard soiling cloth, cut to a diameter of either
— — at least 38 mm for the abrasion test piece holder of the Martindale apparatus (5.2(5.2),), or
— — at least 140 mm for the pilling test piece holder of the Martindale apparatus (5.3(5.3).).
The standard soiling test cloth is impregnated with a soilant mix of carbon black and olive oil. Alternative
soiling cloths can be specified by the client.
NOTE Various standard soiling cloths are commercially available, see Annex AAnnex A.
5.6 5.6 Polyether polyurethane foam underlay, as specified in ISO 12947-1, cut to a diameter of at
least 38 mm, for the abrasion test piece holder of t
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