EN ISO 11641:2012

SLOVENSKI STANDARD
01-november-2013
1DGRPHãþD
SIST EN ISO 11641:2004
Usnje - Preskušanje obstojnosti barve - Obstojnost barve proti znoju (ISO
11641:2012)
Leather - Tests for colour fastness - Colour fastness to perspiration (ISO 11641:2012)
Leder - Farbechtheitsprüfungen - Farbechtheit gegen Schweiß (ISO 11641:2012)
Cuir - Essais de solidité des coloris - Solidité des coloris à la sueur (ISO 11641:2012)
Ta slovenski standard je istoveten z: EN ISO 11641:2012
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11641
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2012
ICS 59.140.30 Supersedes EN ISO 11641:2003
English Version
Leather - Tests for colour fastness - Colour fastness to
perspiration (ISO 11641:2012)
Cuir - Essais de solidité des coloris - Solidité des coloris à Leder - Farbechtheitsprüfungen - Farbechtheit gegen
la sueur (ISO 11641:2012) Schweiß (ISO 11641:2012)
This European Standard was approved by CEN on 14 November 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11641:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 11641:2012) has been prepared by Technical Committee CEN/TC 289 “Leather", the
secretariat of which is held by UNI, in collaboration with the International Union of Leather Technologists and
Chemists Societies.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2013, and conflicting national standards shall be withdrawn at the
latest by May 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11641:2003.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11641:2012 has been approved by CEN as a EN ISO 11641:2012 without any modification.

INTERNATIONAL ISO
STANDARD 11641
IULTCS/IUF
Second edition
2012-11-15
Leather — Tests for colour fastness —
Colour fastness to perspiration
Cuir — Essais de solidité des coloris — Solidité des coloris à la sueur

Reference number
ISO 11641:2012(E)
IULTCS/IUF 426:2012(E)
©
ISO 2012
ISO 11641:2012(E)
IULTCS/IUF 426:2012(E)
©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 11641:2012(E)
IULTCS/IUF 426:2012(E)
Contents Page
Foreword . iv
1  Scope . 1
2  Normative references . 1
3  Principle . 2
4  Apparatus and materials. 2
5  Test specimens . 4
6  Procedure . 4
7  Evaluation . 5
8  Precision . 5
9  Test report . 5
Annex A (informative) Commercial sources for apparatus and materials . 6
Bibliography . 7

ISO 11641:2012(E)
IULTCS/IUF 426:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11641 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).
The first edition of ISO 11641 was based on IUF 426 published in J. Soc. Leather Tech. Chem., 71, pp. 22-24
(1987), and declared an official method of the IULTCS in October 1989.
This second edition of ISO 11641 cancels and replaces the first edition (ISO 11641:1993). This new version is
an update of the procedures and includes provision for an acidic artificial perspiration solution (4.6), the option
of instrumental grey scale measurement (7.2) and precision information (8).
IULTCS, originally formed in 1897, is a worldwide 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.
iv © ISO 2012 – All rights reserved

ISO 11641:2012(E)
INTERNATIONAL STANDARD
IULTCS/IUF 426:2012(E)
Leather — Tests for colour fastness — Colour fastness to
perspiration
1 Scope
This International Standard 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 referenced documents are indispensable for the application 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-A01, Textiles — Tests for colour fastness — Part A01: 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 11641:2012(E)
IULTCS/IUF 426:2012(E)
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 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
3 Principle
A leather specimen 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 specimen is left under
pressure for a specified time in a suitable apparatus. The leather specimen and adjacent fabric are then dried,
and the change in colour of the specimen 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 testing principles shall be in accordance with those described in ISO 105-A01,
taking into account that the substrate is leather.
4 Apparatus and materials
Ordinary laboratory apparatus and
4.1 Test apparatus, consisting of a stainless-steel frame, into which a rectangular weight-piece
approximately 5 kg in mass and approximately 115 mm  60 mm in cross-section fits accurately, so that a
uniform pressure of 12,5  1,0 kPa can be applied on the composite specimen
...