Bsi bs en 20105 a02 1995 (1999)

00414312 PDF BRITISH STANDARD BS EN 20105 A02 1995 ISO 105 A02 1993 Textiles — Test for colour fastness — Part A02 Grey scale for assessing change in colour The European Standard EN 20105 A02 1994 has[.]

ISO 105-A02: 1993

Textiles — Test for

colour fastness —

Part A02: Grey scale for assessing

change in colour

The European Standard EN 20105-A02:1994 has the status of a

British Standard

UDC 677.016.47:677.016.41:535.653

BS EN 20105-A02:1995

This British Standard, having

been prepared under the

direction of the Textiles and

Clothing Standards Policy

Committee, was published

under the authority of the

Standards Board and comes

into effect on

15 January 1995

© BSI 02-1999

First published January 1993

Second edition January 1995

The following BSI references

relate to the work on this

standard:

Committee reference TCM/25

Special announcement in

BSI News March 1994

ISBN 0 580 23143 7

Cooperating organizations

The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries:

Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation

Finland Suomen Standardisoimisliito, r.y

France Association française de normalisation Germany Deutsches Institut für Normung e.V

Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland

Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

Amd No Date Comments

© BSI 02-1999 i

Contents

Page

3 Describing colour changes in fastness tests 4 National annex NA (informative) Committees responsible Inside back cover Table 1 — Examples of descriptions of change in character 4 Table 2 — Abbreviations of qualitative terms 4

BS EN 20105-A02:1995

National foreword

This British Standard has been prepared under the direction of the Textiles and Clothing Standards Policy Committee and is the English language version of

EN 20105-A02:1994 Textiles — Test for colour fastness — Part A02: Grey scale for assessing change in colour, published by the European Committee for

Standardization (CEN), which is identical with ISO 105-A02:1993, published by the International Organization for Standardization (ISO) It supersedes

BS EN 20105-A02:1993, which is withdrawn

The technical content of this British Standard is identical with that of the

corresponding method formerly published in BS 1006:1990 Methods of test for colour fastness of textiles and leather

A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

EUROPÄISCHE NORM August 1994

Descriptors: Textiles, dyes, tests, determination, colour fastness, grey scale, colour differences

English version

Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour

(ISO 105-A02:1993)

Textiles — Essais de solidité des teintures —

Partie A02: Echelle de gris pour l’ évaluation

des dégradations

(ISO 105-A02:1993)

Textilien — Farbechtheitsprüfungen — Teil A02: Graumaßstab zur Bewertung der Änderung der Farbe

(ISO 105-A02:1993)

This European Standard was approved by CEN on 1994-08-09 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 Central Secretariat 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

Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium,

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and

United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1994 Copyright reserved to CEN members

Ref No EN 20105-A02:1994 E

EN 20105-A02:1994

© BSI 02-1999

2

Foreword

This European Standard has been taken over by

CEN/TC 248, Textiles and textile products, from the

work of ISO/TC 38, Texiles of the International

Organization for Standardization (ISO)

The content of this European Standard is identical

to the International Standard ISO 105-A02

Textiles — Tests for colour fastness —

Part A02: Grey scale for assessing change in colour

from 1993

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

February 1995, and conflicting national standards

shall be withdrawn at the latest by February 1995

This European Standard supersedes

EN 20105-A02:1992

In accordance with the common CEN/CENELEC

Rules, the following countries are bound to

implement this European Standard: Austria,

Belgium, Denmark, Finland, France, Germany,

Greece, Iceland, Ireland, Italy, Luxembourg,

Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and United Kingdom

© BSI 02-1999 3

1 Scope

This part of ISO 105 describes the grey scale for

determining changes in colour of textiles in colour

fastness tests, and its use A precise colorimetric

specification of the scale is given as a permanent

record against which newly prepared working

standards and standards that may have changed

can be compared

2 Principle

2.1 The essential, or 5-step, scale consists of five

pairs of non-glossy grey colour chips (or swatches of

grey cloth), which illustrate the perceived colour

differences corresponding to fastness

ratings 5, 4, 3, 2 and 1 This essential scale may be

augmented by the provision of similar chips or

swatches illustrating the perceived colour

differences corresponding to the half-step fastness

ratings 4-5, 3-4, 2-3 and 1-2, such scales being

termed 9-step scales The first member of each pair

is neutral grey in colour and the second member of

the pair illustrating fastness rating 5 is identical

with the first member The second members of the

remaining pairs are increasingly lighter in colour so

that each pair illustrates increasing contrasts or

perceived colour differences which are defined

colorimetrically The full colorimetric specification

is given below

2.2 The chips or swatches shall be neutral grey in

colour and shall be measured with a

spectrophotometer with the specular component

included The colorimetric data shall be calculated

using CIE 1964 supplementary standard

colorimetric system (10° observer data) for

illuminant D65

2.3 The Y tristimulus value of the first member of

each pair shall be 12 ± 1

2.4 The second member of each pair shall be such

that the colour difference between it and the

adjacent first member is as follows:

(Bracketed values apply only to the 9-step scale.)

2.5 Use of the scale. Place a piece of the original textile and the tested specimen of it side by side in the same plane and oriented in the same direction Place the grey scale nearby in the same plane The surrounding field should be neutral grey colour approximately midway between that illustrating grade 1 and that illustrating grade 2 of the grey scale for assessing change in colour (this is approximately Munsell N5) If necessary to avoid effects of the backing on the appearance of the textiles, use two or more layers of the original textile under both original and tested specimens

Illuminate the surfaces with north sky light in the Northern hemisphere, south sky light in the Southern hemisphere, or an equivalent source with

an illumination of 600 lx or more The light should

be incident upon the surfaces at approximately 45°, and the direction of viewing approximately

perpendicular to the plane of the surfaces Compare the visual difference between original and tested material with the differences represented by the grey scale

If the 5-step scale is used, the fastness rating of the specimen is that number of the grey scale which has

a perceived colour difference equal in magnitude to the perceived colour difference between the original and the treated specimens; if the latter is judged to

be nearer the imaginary contrast lying midway between two adjacent pairs than it is to either, the tested specimen is given an intermediate

assessment, for example 4-5 or 2-3 A rating of 5 is given only when there is no perceived difference between the tested specimen and the original material

If the 9-step scale is used, the fastness rating of the specimen is that number of the grey scale which has

a perceived colour difference nearest in magnitude

to the perceived colour difference between the original piece and the tested specimen A rating of 5

is given only when there is no perceived difference between the tested specimen and the original material

When a number of assessments have been made, it

is very useful to compare all the pairs of original and tested specimens which have been given the same numerical rating This gives a good indication of the consistency of the assessments, since any errors become prominent Pairs which do not appear to have the same degree of contrast as the remainder

of their groups should be re-checked against the grey scale and, if necessary, the rating should be changed

Fastness grade CIELAB

difference Tolerance

EN 20105-A02:1994

3 Describing colour changes in

fastness tests

3.1 In using the grey scale, as outlined in 2.5, the

character of the change in colour, whether in hue,

depth, brightness or any combination of these, is not

rated: the overall difference or contrast, between

original and tested specimens, is the basis for the

assessment

3.2 If, as in rating dyes on textiles for example, it is

desired to record the character of the change in

colour of the textile in the test, appropriate

qualitative terms may be added to the numerical

rating, as illustrated by the examples shown in

Table 1

Table 1 — Examples of descriptions of

change in character

3.3 When changes in colour occur in two or three directions, it is considered neither feasible nor necessary to indicate the relative magnitude of each change

3.4 When the space available for recording qualitative terms is restricted, as on pattern cards, the abbreviations shown in Table 2 may be used

Table 2 — Abbreviations of qualitative terms

Meaning

Rating

Contrast corresponding

to following

grades of grey

scale

Character of change

3 Grade 3 Loss in depth of colour

only

3 redder Grade 3 No significant loss in

depth but colour redder

3 weaker

yellower Grade 3 Loss in depth and change in hue

3 weaker

bluer

duller

Grade 3 Loss in depth and

change in both hue and brightness

4-5 redder Intermediate

between

grades 4 and

5

No significant loss in depth but colour slightly redder

Abbreviation Meaning abbreviation French

© BSI 02-1999

National annex NA (informative)

Committees responsible

The United Kingdom participation in the preparation of this European Standard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Committee TCM/25, upon which the following bodies were represented:

Association of Consulting Scientists

Association of Suppliers to the British Clothing Industry Limited

British Retail Consortium

British Textile Confederation

Chemical Industries Association

Home Laundering Consultative Council

International Wool Secretariat

Mail Order Traders’ Association

Ministry of Defence

National Wool Textile Export Corporation

SATRA Footwear Technology Centre

Soap and Detergent Industry Association

Society of Dyers and Colourists

Textile Finishers Association

Textile Research Council (FCRA)

Participation in the detailed technical work was undertaken by the Society of Dyers and Colourists

389 Chiswick High Road

London

W4 4AL

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