prEN ISO 11641

SLOVENSKI STANDARD
01-december-2024
Usnje - Preskušanje obstojnosti barve - Obstojnost barve proti znoju (ISO/DIS
11641:2024)
Leather - Tests for colour fastness - Colour fastness to perspiration (ISO/DIS
11641:2024)
Leder - Farbechtheitsprüfungen - Farbechtheit gegen Schweiß (ISO/DIS 11641:2024)
Cuir - Essais de solidité des coloris - Solidité des coloris à la sueur (ISO/DIS
11641:2024)
Ta slovenski standard je istoveten z: prEN ISO 11641
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 11641
IULTCS
IUF 426
IULTCS
Leather — Tests for colour fastness
Secretariat: ISO
— Colour fastness to perspiration
Voting begins on:
Cuir — Essais de solidité des coloris — Solidité des coloris à la
2024-09-24
sueur
Voting terminates on:
ICS: 59.140.30
2024-12-17
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,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
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 numbers
ISO/DIS 11641:2024(en)
IULTCS/IUF 426:2024(en)
DRAFT
ISO/DIS 11641:2024(en)
International
Standard
ISO/DIS 11641
IULTCS
IUF 426
IULTCS
Leather — Tests for colour fastness
Secretariat: ISO
— Colour fastness to perspiration
Voting begins on:
Cuir — Essais de solidité des coloris — Solidité des coloris à la sueur
ICS: 59.140.30
Voting terminates on:
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 2024
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.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Reference numbers
Published in Switzerland ISO/DIS 11641:2024(en)
IULTCS/IUF 426:2024(en)
ii
ISO/DIS 11641:2024(en)
IULTCS/IUF 426:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Apparatus and materials . 2
6 Test pieces . 4
7 Procedure . 4
8 Evaluation . 5
9 Precision . 5
10 Test report . 5
Annex A (informative) Commercial sources for apparatus and materials . 6
Bibliography . 7

iii
ISO/DIS 11641:2024(en)
IULTCS/IUF 426:2024(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 Fastness Tests Commission of the International Union of
Leather Technologists and Chemists Societies (IUF 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 11641:2012), which has been technically
revised.
The main changes are as follows:
— update of normative references, in particular to ISO 2418 and to ISO 7906.
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 11641:2024(en)
DRAFT International Standard
IULTCS/IUF 426:2024(en)
Leather — Tests for colour fastness — Colour fastness to
perspiration
1 Scope
This document specifies a method for determining the colour fastness to perspiration of leather of all kinds
at all stages of processing. It applies particularly to gloving, clothing and lining leathers, as well as leather
for the uppers of unlined shoes.
The method uses an artificial perspiration solution to simulate the action of human perspiration. Since
perspiration varies widely from one individual to the next, it is not possible to design a method with
universal validity, but the alkaline artificial perspiration solution specified in this International Standard
will give results corresponding to those with natural perspiration in most cases.
NOTE In general, human perspiration is weakly acidic when freshly produced. Micro-organisms then cause it to
change, the pH usually becoming weakly alkaline (pH 7,5 to 8,5). Alkaline perspiration has a considerably greater
effect on the colour of leather than has acid perspiration. Therefore, for coloured leather, an alkaline perspiration
solution is used to simulate the most demanding conditions encountered in practice.
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 7906, Leather — Tests for colour fastness — General principles of testing
ISO 105-A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour
ISO 105-A03, Textiles — Tests for colour fastness — Part A03: Grey scale for assessing staining
ISO 105-A04, Textiles — Tests for colour fastness — Part A04: Method for the instrumental assessment of the
degree of staining of adjacent fabrics
ISO 105-A05, Textiles — Tests for colour fastness — Part A05: Instrumental assessment of change in colour for
determination of grey scale rating
ISO 105-E04, Textiles — Tests for colour fastness — Part E04: Colour fastness to perspiration
ISO 105-F01, Textiles — Tests for colour fastness — Part F01: Specification for wool adjacent fabric
ISO 105-F02, Textiles — Tests for colour fastness — Part F02: Specification for cotton and viscose adjacent fabrics
ISO 105-F03, Textiles — Tests for colour fastness — Part F03: Specification for polyamide adjacent fabric
ISO 105-F04, Textiles — Tests for colour fastness — Part F04: Specification for polyester adjacent fabric
ISO 105-F05, Textiles — Tests for colour fastness — Part F05: Specification for acrylic adjacent fabric
ISO 105-F06, Textiles — Tests for colour fastness — Part F06: Specification for silk adjacent fabric
ISO 105-F07, Textiles — Tests for colour fastness — Part F07: Specification for secondary acetate adjacent fabric
ISO 105-F10, Textiles — Tests for colour fastness — Part F10: Specification for adjacent fabric: Multifibre

ISO/DIS 11641:2024(en)
IULTCS/IUF 426:2024(en)
ISO 2418, Leather — Chemical, physical, mechanical and fastness tests — Position and preparation of specimens
for testing
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
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 leather test piece is soaked in artificial perspiration solution and a piece of adjacent fabric, also soaked in
artificial perspiration solution, is laid against each side to be tested. The composite test piece is left under
pressure for a specified time in a suitable apparatus. The leather test piece and adjacent fabric are then dried,
and the change in colour of the test piece and the staining of the adjacent fabric assessed with the grey scales.
Leathers with a finish may be tested intact or with the finish broken.
The general colour fastness testin
...