SIST EN ISO 7906:2023
(Main)Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)
Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)
This document specifies general principles on colour fastness evaluation tests for leather, as listed in
Annex A.
Procedures included in this document 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 drafting of the
methods is given and the contents of the clauses describing 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 can
be exposed during manufacture and their subsequent use.
The change in colour of leather 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 appearance, 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.
Leder - Farbechtheitsprüfungen - Allgemeine Grundsätze der Prüfung (ISO 7906:2022)
Dieses Dokument legt allgemeine Grundsätze für Prüfungen zur Bewertung der Farbechtheit von Leder fest, wie in Anhang A aufgeführt.
Die in diesem Dokument enthaltenen Verfahren sind für die meisten Echtheitsprüfverfahren gebräuchlich.
Dieses Dokument bietet eine gebräuchliche Grundlage für die Prüfung und Angabe der Farbechtheit. Es wird auf den Nutzen und die Grenzen der Verfahren hingewiesen, mehrere Begriffe werden definiert, ein Über¬blick über die Entwicklung der Verfahren wird gegeben und der Inhalt der Abschnitte, die die Verfahren beschreiben, wird diskutiert.
Die einer Reihe von Verfahren gemeinsamen Vorgehensweisen werden kurz erörtert.
Unter Farbechtheit wird die Beständigkeit der Farbe gegenüber den verschiedenen Einwirkungen verstan-den, denen diese Materialien während der Herstellung und der späteren Verwendung ausgesetzt sein können.
Die Farbveränderung von Leder und das Abfärben von ungefärbten benachbarten Stoffen oder anderen Materialien werden als Echtheitswerte beurteilt.
Andere sichtbare Veränderungen des geprüften Leders, z. B. Erscheinungsbild der Oberfläche, Glanzverän-derung oder Schrumpfung, werden als separate Eigenschaften betrachtet und als solche im Prüfbericht angegeben.
Die Lederechtheitsprüfverfahren können nicht nur zur Beurteilung von Leder und verwandten Materialien, wie beschichtetem Leder und Lederpappe, sondern gegebenenfalls auch zur Beurteilung der Farbechtheit von Lederfarbstoffen angewendet werden. Bei einem solchen Verfahren wird der Farbstoff unter Anwen¬dung vorgegebener Vorgehensweisen auf ein festgelegtes nachgegerbtes Leder oder Crustleder in festgeleg¬ten Farbtiefen aufgetragen, und das Material wird anschließend auf die übliche Weise geprüft.
Cuir - Essais de solidité des coloris - Principes généraux s’appliquant aux essais (ISO 7906:2022)
Le présent document spécifie les principes généraux s’appliquant aux essais d’évaluation de la solidité des coloris, tels qu’indiqués à l’Annexe A.
Les modes opératoires inclus dans le présent document sont communs à la plupart des méthodes d’essai de solidité.
Le présent document fournit une base commune pour les essais de solidité des coloris et la rédaction de comptes-rendus correspondants. Il attire l’attention sur les utilisations et les limites des méthodes, définit plusieurs termes, donne un aperçu de la forme rédactionnelle adoptée pour les normes relatives à chacune de ces méthodes et décrit le contenu des articles constituant ces normes.
Les modes opératoires communs à un certain nombre de méthodes sont brièvement commentés.
Par solidité des coloris, il est signifié la résistance de la couleur aux différents agents auxquels ces matériaux peuvent être exposés au cours de leur fabrication et de leur utilisation ultérieure.
La dégradation de la couleur du cuir et le dégorgement sur des tissus témoins non teints ou d’autres matériaux sont évalués à titre d’indices de solidité.
D'autres changements visibles du cuir soumis à essai, par exemple l'aspect de surface, le changement de brillance ou le retrait, sont considérés comme des caractéristiques séparées et sont enregistrés comme telles.
Ces méthodes peuvent être utilisées non seulement pour l’évaluation de la solidité des coloris du cuir et de matériaux apparentés, tels que du cuir enduit ou un panneau de cuir, mais également pour l’évaluation de la solidité des colorants du cuir, le cas échéant. Dans ce dernier cas, le colorant est appliqué sur un cuir retanné spécifié ou une croûte de cuir particulière, à une profondeur déterminée et en utilisant des modes opératoires déterminés; le matériau est ensuite soumis à essai de la manière habituelle.
Usnje - Preskušanje obstojnosti barve - Splošna načela preskušanja (ISO 7906:2022)
Ta dokument določa splošna načela za preskušanje obstojnosti barve usnja, kot je navedeno v
dodatku A.
Postopki v tem dokumentu so skupni večini metod za preskušanje obstojnosti.
Ta dokument zagotavlja skupno podlago za preskušanje in sporočanje obstojnosti barve. Izpostavljene so vrste uporabe in omejitve metod, opredeljenih je več izrazov, podan je pregled priprave metod ter obravnavana je vsebina točk, v katerih so opisane metode.
Na kratko so obravnavani postopki, ki so skupni številnim metodam.
Obstojnost barve pomeni odpornost barve na različne dejavnike, ki so jim ti materiali lahko
izpostavljeni med proizvodnjo in poznejšo uporabo.
Sprememba barve usnja in obarvanje nebarvanih sosednjih tkanin ali drugih materialov sta ocenjena z oceno obstojnosti.
Druge vidne spremembe usnja, ki se preskuša (npr. videz površine, spremembe v sijaju ali krčenje), so obravnavane kot ločene lastnosti in se o takih tudi poroča.
Metode za preskušanje obstojnosti usnja je poleg ocenjevanja usnja in sorodnih materialov, kot sta premazano usnje in usnjena lepenka, mogoče uporabiti tudi za morebitno ocenjevanje obstojnosti barvil za usnje. Kadar se taka metoda uporablja na tak način, se barvilo nanese na ponovno strojeno usnje ali »crust« usnje v določenih globinah barve po navedenih postopkih, material pa se nato preskusi na običajen način.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7906:2023
01-januar-2023
Usnje - Preskušanje obstojnosti barve - Splošna načela preskušanja (ISO
7906:2022)
Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)
Leder - Farbechtheitsprüfungen - Allgemeine Grundsätze der Prüfung (ISO 7906:2022)
Cuir - Essais de solidité des coloris - Principes généraux s’appliquant aux essais (ISO
7906:2022)
Ta slovenski standard je istoveten z: EN ISO 7906:2022
ICS:
59.140.30 Usnje in krzno Leather and furs
SIST EN ISO 7906:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 7906:2023
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SIST EN ISO 7906:2023
EN ISO 7906
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 59.140.30
English Version
Leather - Tests for colour fastness - General principles of
testing (ISO 7906:2022)
Cuir - Essais de solidité des coloris - Principes Leder - Farbechtheitsprüfungen - Allgemeine
généraux s'appliquant aux essais (ISO 7906:2022) Grundsätze der Prüfung (ISO 7906:2022)
This European Standard was approved by CEN on 20 October 2022.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7906:2022 E
worldwide for CEN national Members.
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SIST EN ISO 7906:2023
EN ISO 7906:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 7906:2023
EN ISO 7906:2022 (E)
European foreword
This document (EN ISO 7906:2022) has been prepared by Technical Committee ISO/IULTCS
"International Union of Leather Technologists and Chemists Societies" in collaboration with Technical
Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI.
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 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 7906:2022 has been approved by CEN as EN ISO 7906:2022 without any modification.
3
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SIST EN ISO 7906:2023
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SIST EN ISO 7906:2023
INTERNATIONAL ISO
STANDARD 7906
IULTCS
IUF 120
First edition
2022-10
Leather — Tests for colour fastness —
General principles of testing
Cuir — Essais de solidité des coloris — Principes généraux
s’appliquant aux essais
Reference numbers
ISO 7906:2022(E)
IULTCS/IUF 120:2022(E)
© ISO 2022
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SIST EN ISO 7906:2023
ISO 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2022 – All rights reserved
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SIST EN ISO 7906:2023
ISO 7906:2022(E)
IULTCS/IUF 120:2022(E)
Contents Page
Foreword .iv
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
4 G ener a l pr i nc iple s . 2
5 Outline of form of the methods . .2
6 T he “Scope” clause . 2
7 T he “Normative references” clause. 2
8 The “Terms and definitions” clause . 2
9 The “Principle” clause . 2
10 T he “Apparatus”, “Reagents” or “Reference materials” clause(s) . 2
10.1 G eneral . 2
10 . 2 Te s t s olut ion s . 3
10.3 A djacent materials . . 3
10.4 C oating substances . 4
10.5 S tandard reference for fading . 4
10.6 S tandard reference for rubbing and soiling. 4
10.7 S election 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 . 4
11 The “Test specimen” clause .5
11.1 General . 5
11.2 P reparation of specimens . 5
11.3 P reparation of composite specimens . 5
11.3.1 General . 5
11.3.2 St aples . 5
11.3.3 Composite specimens using two single-fibre adjacent fabrics . 5
11.3.4 Composite specimens using one multifibre adjacent fabric . 6
12 C ond it ion i n g .6
13 T he “Procedure” clause . 6
14 A ssessment of colour fastness .7
14.1 G eneral conditions . 7
14.2 C olour fastness with respect to change in colour . 7
14.3 C olour fastness with respect to staining . 8
15 Conditions of viewing and illumination in assessing colour fastness .8
16 Te s t r ep or t . 8
Annex A (informative) Leather fastness test methods .10
Bibliography .11
iii
© ISO 2022 – All rights reserved
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SIST EN ISO 7906:2023
ISO 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.
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 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, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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 2022 – All rights reserved
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SIST EN ISO 7906:2023
ISO 7906:2022(E)
INTERNATIONAL STANDARD
IULTCS/IUF 120:2022(E)
Leather — Tests for colour fastness — General principles
of testing
1 S cope
This document specifies general principles on colour fastness evaluation tests for leather, as listed in
Annex A.
Procedures included in this document 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 drafting of the
methods is given and the contents of the clauses describing 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 can
be exposed during manufacture and their subsequent use.
The change in colour of leather 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 appearance, 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 Normat ive 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 3696, Water for analytical laboratory use — Specification and test methods
ISO 15115, Leather — Vocabulary
3 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/
1
© ISO 2022 – All rights reserved
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SIST EN ISO 7906:2023
ISO 7906:2022(E)
IULTCS/IUF 120:2022(E)
4 General principles
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 “S cope” 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 and leather board, and the eventual adjacent materials subject
to colour migration and/or appearance alteration.
7 The “Normati ve 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.
2
© ISO 2022 – All rights reserved
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SIST EN ISO 7906:2023
ISO 7906:2022(E)
IULTCS/IUF 120:2022(E)
10.2 Test solutions
10.2.1 Test solutions shall be prepared using Grade 3 water that conforms to 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
10.3.1 Adjacent materials are used for assessing staining under both 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, uncoloured state. In the case
of fabrics, they can be made of an undyed cloth of a single or several generic kinds of fibre. Adjacent
plastics may be reference or industrial polymers.
10.3.2 Single-fibre adjacent fabrics, if not otherwise specified, should be of plain weave, with an
average mass per unit area and free from chemically damaged fibres, residual finishing chemicals, dyes
or fluorescent whitening agents.
10.3.3 Properties of the single-fibre adjacent fabrics are given und
...
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/DIS
7906:2022)
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
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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
---------------------- Page: 3 ----------------------
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© 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.
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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 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-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 test
ISO 105-B06, Textiles — Tests for colour fastness — Part B06: Colour fastness and ageing to artificial light
at high temperatures: Xenon arc fading lamp test
ISO 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 sample
ISO 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 reflectance
3 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.
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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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