EN ISO 7906:2022 PDF
Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)
Leather - Tests for colour fastness - General principles of testing (ISO 7906:2022)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 18
- Дата публикации:
- 9 ноября 2022 г.
- Издание:
- CEN EN 7906 edition 1 version 1
- ICS:
- 59.140.30
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.
Abstract
Overview
EN ISO 7906:2022 - Leather: Tests for colour fastness - General principles of testing defines the common principles and framework used to evaluate colour (color) fastness of leather. Prepared by IULTCS in collaboration with CEN, this standard provides a consistent basis for preparing, performing and reporting fastness tests (see Annex A for specific methods). It covers definitions, uses and limitations of methods, and procedures that are common to most leather fastness test methods.
Key Topics
- Scope and purpose: Establishes general principles for assessing change in colour and staining of adjacent materials; other visible changes (surface appearance, gloss, shrinkage) are treated separately.
- Structure of test methods: Specifies mandatory clause headings for individual methods - Introduction, Scope, Normative references, Terms and definitions, Principle, Apparatus/Reagents/Reference materials, Test specimen, Procedure, Test report.
- Terms and definitions: Aligns with ISO 15115 vocabulary for leather to ensure consistent terminology.
- Test specimens & conditioning: Guidance on specimen preparation, composite specimens, and environmental conditioning prior to testing.
- Adjacent materials: Selection and use of adjacent fabrics (single-fibre, multifibre) for staining assessment.
- Common apparatus and reagents: General requirements for equipment and test solutions used across different fastness tests.
- Assessment & rating: How to evaluate colour change and staining and how to express results as relative fastness ratings.
- Viewing & illumination: Conditions for visual assessment to ensure reproducible evaluation of colour differences.
- Reporting: Required content of the test report so results are comparable and traceable.
Applications
EN ISO 7906:2022 is practical for:
- Leather manufacturers and tanneries performing internal quality control and batch acceptance.
- Independent testing laboratories and conformity assessment bodies standardizing fastness testing and reporting.
- Product developers and material specifiers evaluating dye performance or the durability of coloured leather, coated leather and leather board.
- Dye manufacturers testing dyes applied to specified retanned or crust leather under controlled depths of colour.
- Brands and OEMs requiring reproducible fastness data for specifications, procurement, or regulatory compliance.
Related Standards
- ISO 15115 (Leather - Vocabulary) - terminology referenced by EN ISO 7906:2022.
- ISO 3696 (Water for analytical laboratory use) - referenced for test liquids and reagents.
- CEN adoption: EN ISO 7906:2022 is the CEN-endorsed version of ISO 7906:2022.
Keywords: EN ISO 7906:2022, colour fastness, color fastness, leather testing, fastness ratings, leather dyes, adjacent fabrics, test report.
Технические детали
- Технический комитет
- CEN/TC 289 - Leather
- SKU
- EN ISO 7906:2022
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