BS-EN-20105-A02-1995.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 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: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation française de normalisation GermanyDeutsches Institut für Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portuguès da Qualidade SpainAsociación Española de Normalización y Certificación SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 20105-A02:1995 © BSI 02-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 1Scope3 2Principle3 3Describing colour changes in fastness tests4 National annex NA (informative) Committees responsibleInside back cover Table 1 Examples of descriptions of change in character4 Table 2 Abbreviations of qualitative terms4 BS EN 20105-A02:1995 ii © BSI 02-1999 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. EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 20105-A02 August 1994 UDC 677.016.47:677.016.41:535.653Supersedes EN 20105-A02:1992 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. EN 20105-A02:1994 © BSI 02-19993 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 gradeCIELAB difference Tolerance 500,2 (4-5)0,8± 0,2 41,7± 0,3 (3-4)2,5± 0,35 33,4± 0,4 (2-3)4,8± 0,5 26,8± 0,6 (1-2)9,6± 0,7 113,6± 1,0 EN 20105-A02:1994 4 © BSI 02-1999 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 3Grade 3Loss in depth of colour only 3 redderGrade 3No significant loss in depth but colour redder 3 weaker yellower Grade 3Loss in depth and change in hue 3 weaker bluer duller Grade 3Loss 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 AbbreviationMeaning French abbreviation BlBluerB GGreenerV RRedderR YYellowerJ WWeakerC StrStrongerF DDullerT BrBrighterPu BS EN 20105-A02:1995 © 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. 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