EN 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

• Status: Published
• Publication Date: 08-Nov-2022
• ICS: 59.140.30 - Leather and furs
• Technical Committee: CEN/TC 289 - Leather
• Drafting Committee: CEN/TC 289/WG 3 - Fastness test methods
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 09-Nov-2022
• Due Date: 20-Sep-2023
• Completion Date: 09-Nov-2022
• Ref Project: SIST EN ISO 7906:2023 - Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)

Standards Content (Sample)

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

Contents Page
European foreword . 3

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.

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 7906:2022(E)
IULTCS/IUF 120:2022(E)
© 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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
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 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 right
...