oSIST prEN ISO 7906:2022
(Main)Leather - Tests for colour fastness - General principles of testing (ISO/DIS 7906:2022)
Leather - Tests for colour fastness - General principles of testing (ISO/DIS 7906:2022)
This standard provides general information about the methods for testing colour fastness of leather for the guidance of users
Leder - Farbechtheitsprüfungen - Allgemeine Grundsätze der Prüfung (ISO/DIS 7906:2022)
Cuir - Essais de solidité des coloris - Principes généraux s’appliquant aux essais (ISO/DIS 7906:2022)
Usnje - Preskušanje obstojnosti barve - Splošna načela preskušanja (ISO/DIS 7906:2022)
General Information
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN ISO 7906:2022
01-april-2022
Usnje - Preskušanje obstojnosti barve - Splošna načela preskušanja (ISO/DIS
7906:2022)
Leather - Tests for colour fastness - General principles of testing (ISO/DIS 7906:2022)
Leder - Farbechtheitsprüfungen - Allgemeine Grundsätze der Prüfung (ISO/DIS7906:2022)
Cuir - Essais de solidité des coloris - Principes généraux s’appliquant aux essais
(ISO/DIS 7906:2022)Ta slovenski standard je istoveten z: prEN ISO 7906
ICS:
59.140.30 Usnje in krzno Leather and furs
oSIST prEN ISO 7906:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 7906:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 7906
IULTCS
IUF 120
IULTCS Secretariat: ISO
Voting begins on: Voting terminates on:
2022-01-25 2022-04-19
Leather — Tests for colour fastness — General principles
of testing —
Part :
General principles of testing
ICS: 59.140.30
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference numbers
NATIONAL REGULATIONS.
ISO/DIS 7906:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
IULTCS/IUF 120:2022(E)
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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
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Email: copyright@iso.org
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Published in Switzerland
© ISO 2022 – All rights reserved
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ..................................................................................................................................................................................... 1
3 Terms and definitions .................................................................................................................................................................................... 2
4 General principle .................................................................................................................................................................................................2
5 Outline of form of the methods ........................................................................................................................................... ..................2
6 The “Scope” clause .............................................................................................................................................................................................. 2
7 The “Normative references” clause.................................................................................................................................................. 3
8 The “Terms and definitions” clause ................................................................................................................................................ 3
9 The “Principle” clause .................................................................................................................................................................................... 3
10 The “Apparatus”, “Reagents” or “Reference materials” clause(s) .................................................................... 3
10.1 General ........................................................................................................................................................................................................... 3
10.2 Test solutions ........................................................................................................................................................................................... 3
10.3 Adjacent materials ........................................................................................................................................... .................................... 3
10.4 Coating substances ............................................................................................................................................................................. 4
10.5 Standard reference for fading ................................................................................................................................................... 4
10.6 Standard reference for rubbing and soiling.................................................................................................................. 4
10.7 Selection and use of adjacent fabrics .................................................................................................................................. 4
10.7.1 General ........................................................................................................................................................................................ 4
10.7.2 Types of adjacent fabric ................................................................................................................................................ 4
10.7.3 Dimensions and use of adjacent fabrics ......................................................................................................... 5
11 The “Test specimen” clause ......................................................................................................................................................................5
11.1 General ........................................................................................................................................................................................................... 5
11.2 Preparation of specimens ............................................................................................................................................................. 5
11.3 Preparation of composite specimens ................................................................................................................................. 5
12 Conditioning .............................................................................................................................................................................................................6
13 The “Procedure” clause ................................................................................................................................................................................ 6
14 A ssessment of colour fastness ...............................................................................................................................................................7
14.1 General conditions .............................................................................................................................................................................. 7
14.2 Colour fastness with respect to change in colour ................................................................................................... 7
14.3 Colour fastness with respect to staining ........................................................................................................................ 8
15 Conditions of viewing and illumination in assessing colour fastness ........................................................8
16 Test report .................................................................................................................................................................................................................. 9
Annex A (informative) Leather fastness test methods ..................................................................................................................10
Bibliography .............................................................................................................................................................................................................................11
iii© ISO 2022 – All rights reserved
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(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.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).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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).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 Fastness Tests Commission of the International Union of Leather
Technologists and Chemists Societies (IUF 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).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: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.© ISO 2022 – All rights reserved
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
DRAFT INTERNATIONAL STANDARD
IULTCS/IUF 120:2022(E)
Leather — Tests for colour fastness — General principles
of testing —
Part :
General principles of testing
1 Scope
This document provides general guidance to the evaluation of leather fastness tests. Procedures
included in this Standard are common to most of the fastness test methods.This document provides a common basis for testing and reporting colour fastness. The uses and
limitations of the methods are pointed out, several terms are defined, an outline of the form of the
methods is given and the contents of the clauses constituting the methods are discussed. Procedures
common to a number of the methods are discussed briefly.Colour fastness means the resistance of the colour to the different agents to which these materials
may be exposed during manufacture and their subsequent use. The change in colour and staining of
undyed adjacent fabrics or other materials are assessed as fastness ratings. Other visible changes in the
leather under test, for example surface effects, change in gloss or shrinkage, are considered as separate
properties and reported as such.The leather fastness test methods can be used not only for assessing leather and related materials,
such as coated leather and leather board, but also for the eventual assessment of the colour fastness of
leather dyes. When such a method is so used, the dye is applied to a specified retanned leather or crust
leather in defined depths of colour by stated procedures and the material is then tested in the usual
way.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-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 fabricsISO 105-A05, Textiles — Tests for colour fastness — Part A05: Instrumental assessment of change in colour
for determination of grey scale ratingISO 105-B01, Textiles — Tests for colour fastness — Part B01: Colour fastness to light: Daylight
ISO 105-B02, Textiles — Tests for colour fastness — Part B02: Colour fastness to artificial light: Xenon arc
fading lamp testISO 105-B06, Textiles — Tests for colour fastness — Part B06: Colour fastness and ageing to artificial light
at high temperatures: Xenon arc fading lamp testISO 105-F10, Textiles — Tests for colour fastness — Part F10: Specification for adjacent fabric: Multifibre
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(E)
ISO 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 2419, Leather — Physical and mechanical tests — Sample preparation and conditioning
ISO 2588, Leather — Sampling — Number of items for a gross sampleISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 15115, Leather — Vocabulary
ISO 22700, Leather — Measuring the colour and colour difference of finished leather
ISO 17502, Leather — Determination of surface reflectance3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15115 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/
4 General principle
This method allows the evaluation of the eventual colour change and / or migration to which a leather
or related material such as coated leather or leather board specimen may be exposed by means of
chemicals, radiation, temperature, weathering and / or interaction with adjacent materials, expressed
in relative fastness numbers.5 Outline of form of the methods
The headings of the principal clauses of the individual test methods are as follows:
“Introduction”“Scope”
“Normative references”
“Terms and definitions”
“Principle”
“Apparatus”, “Reagents” or “Reference materials”
“Test specimen”
“Procedure”
“Test report”
6 The “Scope” clause
This method is intended to be used for the evaluation of colour change and / or staining on leather and
related materials such as coated leather, leather board, etc., and the eventual adjacent materials subject
to migration in terms of colour and / or appearance alteration.© ISO 2022 – All rights reserved
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(E)
7 The “Normative references” clause
Under this heading is given a complete list of other documents which are indispensable for the
application of the method.8 The “Terms and definitions” clause
Under this heading are definitions of any terms that may not be clear and eventual limitations to the
scope.9 The “Principle” clause
Under this heading is given a concise statement of the principle of the method to enable the user to
decide whether it is appropriate for the desired scope.10 The “Apparatus”, “Reagents” or “Reference materials” clause(s)
10.1 General
Under these headings, either individually or combined, the equipment and supplies required for the test
are described.10.2 Test solutions
10.2.1 Test solutions shall be prepared using Grade 3 water complying with ISO 3696.
10.2.2 The concentrations of baths or solutions are given in millilitres per litre (ml/l) or grams per
litre (g/l).10.2.3 The qualities of chemicals to be used are given in each method.
10.2.4 For crystalline substances, the amount of water of crystallization is given and, for liquids, the
relative density at 20 °C.10.3 Adjacent materials
Adjacent materials are used for assessing staining both under static and dynamic test conditions.
Adjacent materials may be specific fabrics, plastic materials, metals or leathers as specified in the single
test methods. Adjacent materials are usually in a natural not coloured state. In case of fabrics, it can be
made of an undyed cloth, of a single or of several generic kinds of fibres. Adjacent plastics maybe made
of standard or industrial polymers.10.3.1 Single-fibre adjacent fabrics, if not otherwise specified, should be of plain weave, medium mass
per unit area and free from chemically damaged fibres, finished residual chemicals, dyes or fluorescent
whitening agents.10.3.2 Properties of the single-fibre adjacent fabrics are given under the different adjacent fabric
specifications.10.3.3 Multifibre adjacent fabrics are made of yarns of various generic kinds of fibres, each of which
forms a strip of at least 1,5 cm width providing even thickness of the fabric. It is intended that the
staining properties of generic fibres used in single fibre and multifibre adjacent fabrics be identical.
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oSIST prEN ISO 7906:2022
ISO/DIS 7906:2022(E)
IULTCS/IUF 120:2022(E)
The staining properties of these fabrics should be verified by the supplier. There are two standardized
multifibre adjacent fabrics, whose contents differ:a) Type DW (Diacetate-Wool): secondary acetate, bleached cotton, polyamide, polyester, acrylic, wool
(see ISO 105-F10);b) Type TV (Triacetate-Viscose): triacetate, bleached cotton, polyamide, polyester, acrylic, viscose
(see ISO 105-F10).10.3.4 Suitable plastic adjacent materials such as plasticized poly(vinyl chloride) (PVC), thermoplastic
polyurethane (TPU), ethylene vinyl-acetate (EVA), etc., are defined in the specific standards. In the case
of contact with non-standard polymeric materials, such as specific polymers, an accurate descrip
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