EN 13523-22:2003
(Main)Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison
Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison
This Part of prEN 13523 describes the procedure for determining the difference in the colour of an organic coating on a metallic substrate by visual comparison against a standard using either diffuse natural daylight or artificial daylight in a standard booth.
NOTE Results may differ between natural and artificial daylight.
It may occur that two colour specimens will match in daylight but not under another light source. This phenomenon is known as metamerism (see EN 13523-15).
In case a metameric match is to be reported in objective terms, spectrophotometric measurements (using CIE Standard Illuminants D65 and A) should be made, in accordance with EN 13523-15.
No statement is made about either the precision or the accuracy of this procedure since the results derived are neither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, this procedure should only be used where the use of colour measuring instruments is not recommendable (evaluation of colour matches, inspection of metallic colours etc.).
Although colour measuring instruments should be used where possible, in some cases a visual comparison can be useful (evaluation of colour matches, inspection of metallic colours etc.).
The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and specimen size, provides for improved uniformity of results. This practice is essential for critical colour matching and is highly recommended for colour inspections.
Bandbeschichtete Metalle - Prüfverfahren - Teil 22: Farbabstand - Visueller Vergleich
Tôles préplaquées - Méthodes d'essai - Partie 22 : Différences de couleur - Comparaison visuelle
La présente partie de l'EN 13523 décrit le mode opératoire mis en �uvre pour déterminer la différence de couleur entre un revêtement organique appliqué sur un subjectile métallique et un étalon en les comparant visuellement à la lumière du jour naturelle diffuse ou sous une lumière du jour artificielle dans une cabine normalisée.
NOTE Les résultats peuvent être différents à la lumière naturelle et à la lumière artificielle.
Il peut arriver que deux éprouvettes de couleur identiques à la lumière du jour ne le soient pas sous une autre source de lumière. Ce phénomène est connu sous le nom de métamérisme (voir l'EN 13523-15).
Dans le cas où une identité par métamérisme doit être consigné dans le rapport de manière objective, il est recommandé d'effectuer des mesurages spectrophotométriques (à l'aide des illuminants normalisés D65 et A de la CIE), conformément à l'EN 13523-15.
Aucune déclaration n'est faite concernant la fidélité ou l'exactitude du présent mode opératoire car les résultats obtenus ne se présentent pas sous forme numérique et qu'ils ne fournissent pas non plus une évaluation de type acceptation/rejet de façon objective. Il convient donc que ce mode opératoire soit uniquement mis en �uvre lorsque l'utilisation d'instruments de mesure de la couleur n'est pas recommandée (évaluation de la conformité des couleurs, contrôle des couleurs métalliques, etc.).
Bien qu'il convienne d'utiliser des instruments de mesure de la couleur lorsque cela est possible, une comparaison visuelle peut être utile dans certains cas (évaluation de la conformité des couleurs, contrôle des couleurs métalliques, etc.).
La normalisation de ce type de comparaisons visuelles au moyen de sources de lumière, en éclairant et en examinant des éprouvettes de géométrie et taille données, permet d'améliorer l'uniformité des résultats. Cette pratique est fondamentale pour les comparaisons de couleurs critiques et est vivement recommandée pour les contrôles de la couleur.
Kovine, zaščitene po postopku coil-coating – Preskusne metode – 22. del: Razlika v niansi – Vizualna primerjava
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bandbeschichtete Metalle - Prüfverfahren - Teil 22: Farbabstand - Visueller VergleichTôles préplaquées - Méthodes d'essai - Partie 22 : Différences de couleur - Comparaison visuelleCoil coated metals - Test methods - Part 22: Colour difference - Visual comparison25.220.60Organske prevlekeOrganic coatings17.180.20Barve in merjenje svetlobeColours and measurement of lightICS:Ta slovenski standard je istoveten z:EN 13523-22:2003SIST EN 13523-22:2004en01-januar-2004SIST EN 13523-22:2004SLOVENSKI
STANDARD
SIST EN 13523-22:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13523-22May 2003ICS 17.180.20; 25.220.60English versionCoil coated metals - Test methods - Part 22: Colour difference -Visual comparisonTôles prélaquées - Méthodes d'essai - Partie 22: Différencede couleur - Comparaison visuelleBandbeschichtete Metalle - Prüfverfahren - Teil 22:Farbabstand - Visueller VergleichThis European Standard was approved by CEN on 11 March 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13523-22:2003 ESIST EN 13523-22:2004
EN 13523-22:2003 (E)2ForewordThis document (EN 13523-22:2003) has been prepared by Technical Committee CEN /TC 139 "Paints andvarnishes", the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2003, and conflicting national standards shall be withdrawn at the latestby November 2003.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 13523-22:2004
EN 13523-22:2003 (E)31 ScopeThis Part of EN 13523 describes the procedure for determining the difference in the colour of an organic coating ona metallic substrate by visual comparison against a standard using either diffuse natural daylight or artificial daylightin a standard booth.NOTEResults may differ between natural and artificial daylight.It may occur that two colour specimens will match in daylight but not under another light source. This phenomenonis known as metamerism (see EN 13523-15).In case a metameric match is to be reported in objective terms, spectrophotometric measurements (usingCIE Standard Illuminants D65 and A) should be made, in accordance with EN 13523-15.No statement is made about either the precision or the accuracy of this procedure since the results derived areneither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, this procedureshould only be used where the use of colour measuring instruments is not recommendable (evaluation of colourmatches, inspection of metallic colours etc.).Although colour measuring instruments should be used where possible, in some cases a visual comparison can beuseful (evaluation of colour matches, inspection of metallic colours etc.).The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and specimensize, provides for improved uniformity of results. This practice is essential for critical colour matching and is highlyrecommended for colour inspections.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 13523-0:2001, Coil coated metals — Test methods — Part 0: General introduction and list of test methods.EN 23270, Paint and varnishes and their raw materials — Temperatures and humidities for conditioning and testing(ISO 3270:1984).3 Terms and definitionsFor the purposes of this Part of EN 13523, the terms and definitions given in EN 13523-0:2001 apply, together withthe following.3.1coloursensation resulting from the visual perception of radiation of a given spectral composition[EN 971-1:1996]3.2metamerismphenomenon characterized by the difference in colour observed when two specimens visually matching under agiven light source are viewed under another light source with different spectral characteristicsSIST EN 13523-22:2004
EN 13523-22:2003 (E)44 PrincipleThe colour of the specimen under test is visually compared with a standard prepared under similar conditions. Thecomparison is carried out using either diffuse natural daylight or artificial daylight, in a standard booth.5 Illumination for colour matching5.1 Natural daylightLight from a moderately overcast northern sky (for countries on the northern hemisphere). Reflection from stronglycoloured neighbouring objects as well as direct sunlight should be excluded. The level of illumination shall be at least2000 lx and shall be uniform over the viewing area.5.2 Artificial daylightThe evaluation area shall be shielded from external light, preferably by a permanent structure (lighting cabinet). Thespectral characteristics of the light source should be equivalent to those of the CIE Standard Illuminant D65.DIN 6173-2, BS 950-1 and BS 950-2 provide procedures for measuring the actual spectral energy distribution over theviewed area.The photometric conditions require an illumination between 1000 lx (for very light colours) and 4000 lx (for very darkcolours).The manufacturer of the artificial light source shall disclose the number of running hours which his product can beexpect
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