1、BSI Standards PublicationBS EN 13523-3:2014Coil coated metals Test methodsPart 3: Colour difference Instrumental comparisonBS EN 13523-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13523-3:2014. It supersedes BS EN 13523-3:2001 which is withdrawn.The UK
2、 participation in its preparation was entrusted to Technical Committee STI/21, Surface preparation of steel.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users
3、 are responsible for its correct application. The British Standards Institution 2014Published by BSI Standards Limited 2014ISBN 978 0 580 80211 9ICS 17.180.20; 25.220.60Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the auth
4、ority of the Standards Policy and Strategy Committee on 30 June 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 13523-3:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13523-3 June 2014 ICS 25.220.60 Supersedes EN 13523-3:2001English Version Coil coated
5、metals - Test methods - Part 3: Colour difference - Instrumental comparison Tles prlaques - Mthodes dessai - Partie 3 : Diffrence de couleur - Comparaison au moyen dinstruments Bandbeschichtete Metalle - Prfverfahren - Teil 3: Farbabstand - Farbmetrischer Vergleich This European Standard was approve
6、d by CEN on 7 May 2014. 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 standa
7、rds 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 not
8、ified 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, I
9、celand, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Ma
10、nagement Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13523-3:2014 EBS EN 13523-3:2014EN 13523-3:2014 (E) 2 Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Terms and d
11、efinitions .5 4 Principle 6 5 Apparatus .6 6 Sampling .6 7 Specimens 6 8 Procedure .7 8.1 Calibration 7 8.2 Measurement 7 9 Expression of results 7 10 Accuracy .8 11 Test report 8 Bibliography 9 BS EN 13523-3:2014EN 13523-3:2014 (E) 3 Foreword This document (EN 13523-3:2014) has been prepared by Tec
12、hnical Committee CEN/TC 139 “Paints and varnishes”, 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 or by endorsement, at the latest by December 2014, and conflicting national standards shall
13、 be withdrawn at the latest by December 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13523-3:2001
14、. The main technical changes are: a) the definitions were aligned with those in EN ISO 4618; b) the scope and procedure were amended. EN 13523, Coil coated metals Test methods, consists of the following parts: Part 0: General introduction Part 1: Film thickness Part 2: Gloss Part 3: Colour differenc
15、e Instrumental comparison Part 4: Pencil hardness Part 5: Resistance to rapid deformation (impact test) Part 6: Adhesion after indentation (cupping test) Part 7: Resistance to cracking on bending (T-bend test) Part 8: Resistance to salt spray (fog) Part 9: Resistance to water immersion Part 10: Resi
16、stance to fluorescent UV radiation and water condensation Part 11: Resistance to solvents (rubbing test) Part 12: Resistance to scratching Part 13: Resistance to accelerated ageing by the use of heat Part 14: Chalking (Helmen method) Part 15: Metamerism Part 16: Resistance to abrasion BS EN 13523-3:
17、2014EN 13523-3:2014 (E) 4 Part 17: Adhesion of strippable films Part 18: Resistance to staining Part 19: Panel design and method of atmospheric exposure testing Part 20: Foam adhesion Part 21: Evaluation of outdoor exposed panels Part 22: Colour difference Visual comparison Part 23: Resistance to hu
18、mid atmospheres containing sulfur dioxide Part 24: Resistance to blocking and pressure marking Part 25: Resistance to humidity Part 26: Resistance to condensation of water Part 27: Resistance to humid poultice (Cataplasm test) Part 29: Resistance to environmental soiling (Dirt pick-up and striping)
19、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, Former Yugoslav Republic of Macedonia, France, Ger
20、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 13523-3:2014EN 13523-3:2014 (E) 5 1 Scope This part of EN 13523 specifies procedu
21、res for determining the instrumental colour difference (CIELAB) of an organic coating on a metallic substrate. Establishing a standard as well as the magnitude of an acceptable colour difference are not covered by this method. Two methods are given in this part of EN 13523: a) instrumental colour di
22、fference measurement using a tristimulus colorimeter; b) instrumental colour difference measurement using a spectrophotometer or equivalent. Care should be taken when measuring e.g. textured surfaces; fluorescent coatings; metameric coatings; multi-coloured, pearlescent, metallic or special colour e
23、ffect coatings. In order to determine whether metamerism is present, the metamerism index is determined (see EN 13523-15) and/or a visual examination (see EN 13523-22) is performed with different artificial light sources. 2 Normative references The following documents, in whole or in part, are norma
24、tively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13523-0:2014, Coil coated metals Test methods Part 0: Gener
25、al introduction EN 23270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing (ISO 3270) EN ISO 11664-4, Colorimetry Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4) 3 Terms and definitions For the purposes of this document, the terms and definitio
26、ns given in EN 13523-0:2014 and the following apply. 3.1 colour sensation resulting from the perception of light of a given spectral composition by the human eye Note 1 to entry: The use of the German word “Farbe” alone, i.e. not in combinations of words, for coating materials is deprecated. BS EN 1
27、3523-3:2014EN 13523-3:2014 (E) 6 Note 2 to entry: A colour is characterized by hue, chroma, and lightness. SOURCE: FprEN ISO 4618:2014, 2.58 3.2 embossed coating coating which, when dried, has been mechanically impressed with a pattern 3.3 metamerism phenomenon perceived when two specimens have the
28、same colour under the lighting of an illuminant, but different spectral reflection and transmission curves SOURCE: FprEN ISO 4618:2014, 2.157 3.4 textured coating coating which, after drying, is characterized by a regularly structured surface SOURCE: FprEN ISO 4618:2014, 2.255 4 Principle The tristi
29、mulus values X, Y and Z (see EN ISO 11664-3) of both standard colour reference panel (called “standard” through the text) and specimen are measured. Colour differences between the two measurements are calculated from these tristimulus values. 5 Apparatus Ordinary laboratory apparatus, together with
30、the following: 5.1 Tristimulus colorimeter. 5.2 Recording spectrophotometer or equivalent. The instrument shall provide the possibility of obtaining the tristimulus values either for the 2-standard colorimetric observer and source C or for the 10-supplementary standard colorimetric observer and sour
31、ce D65. The latter conditions of 10 observer and D65 source are preferred. Preferably the measured area shall have a minimum diameter of 10 mm. If a smaller diameter is used, this shall be stated in the test report. 6 Sampling See EN 13523-0. 7 Specimens See EN 13523-0. The surfaces to be measured s
32、hall be at least as large as the area of the measuring aperture and shall be flat against the measuring aperture. BS EN 13523-3:2014EN 13523-3:2014 (E) 7 8 Procedure 8.1 Calibration Use the apparatus in accordance with the manufacturers instructions, particularly with regard to warm-up time and cali
33、bration. 8.2 Measurement Measure the colour at ambient temperature. In cases of dispute, the test temperature shall be defined as (23 2) C and the relative humidity as (50 5) %, in accordance with EN 23270. Conditioning is carried out in accordance with EN 13523-0:2014, Clause 6. Measure in the wave
34、length range of at least 400 nm to 700 nm in intervals not greater than 20 nm with a half-intensity width of the monochromator less than 20 nm. In special cases, such as highly chromatic paint films with steep spectral reflectance curves measurements in 10 nm or 5 nm intervals using a monochromator
35、with 10 nm or 5 nm half-intensity width are more accurate. The illumination/viewing geometry shall be one of the following: a) 45:0 or 0:45; b) integrating sphere (d:8 or 8:d). The inclusion or exclusion of specular reflection shall be stated in the test report. Determine first the tristimulus value
36、s of the standard or recall them from a data file. Thereafter determine the tristimulus values of the specimen to be measured. Using these tristimulus values, calculate the colour difference and its components, using the CIELAB formula given in EN ISO 11664-4. Usually the software associated with th
37、e spectrophotometer shall give the absolute Lab values and the colour difference on each colour dimension. If a different colour equation is used, this shall be stated in the test report. Colour differences shall not be compared when they are obtained by different colour scale system equations. In c
38、ase of dispute the test shall be carried out on the same equipment. Textured and embossed coatings should be measured with an integrating sphere or with 45-annular/circumferential illumination. An average result can be obtained by turning the specimens three times through 90 to obtain four measureme
39、nts. 9 Expression of results Express the value of the instrumental colour difference in terms of the relevant colour coordinates L* a* b* or L* *abC *abH in addition to the total colour difference *abE . L* positive = lighter than standard L* negative = darker than standard a* positive = Redder/less
40、 green than standard a* negative = Greener/less red than standard b* positive = Yellower/less blue than standard BS EN 13523-3:2014EN 13523-3:2014 (E) 8 b* negative = Bluer/less yellow than standard *abC positive = specimen has more chroma (colour saturation) relative to the standard *abC negative =
41、 specimen has less chroma (colour saturation) relative to the standard *abH positive = In the CIELAB system *abH positive indicates that the hue angle (arctan b*/a*) deviates from the standard in an anticlock-wise direction, i.e. in the sequence red to yellow to green to blue. *abH negative = The hu
42、e angle deviates from the standard in a clockwise direction, i.e. in the sequence blue to green to yellow to red. The total colour difference *abE is a mathematical combination of the above colour difference components. Calculate the total colour difference *abE , of textured coatings as the mean of
43、 the individual *abE measurements. 10 Accuracy For dark colours (e.g. blues, browns, blacks) or for bright colours of high chroma (e.g. reds, yellows), the error in reflectance measurement at certain wavelengths might be sufficient to give misleading results. In these cases visual comparison is esse
44、ntial (see EN 13523-22). 11 Test report The test report shall contain at least the following information: a) all details necessary to identify the product tested; b) a reference to this part of EN 13523 (EN 13523-3); c) the instrument used; d) the source and observer used; e) the geometry used; f) t
45、he colour difference equation; g) inclusion or exclusion of specular reflection; h) the colour difference value (see Clause 9); i) components of the colour difference, if required; j) any deviation from the test method specified; k) any unusual features (anomalies) observed during the test; l) the d
46、ate of the test. BS EN 13523-3:2014EN 13523-3:2014 (E) 9 Bibliography 1 EN 1396, Aluminium and aluminium alloys Coil coated sheet and strip for general applications Specifications 2 EN 10169:2010+A1:2012, Continuously organic coated (coil coated) steel flat products Technical delivery conditions 3 E
47、N 13523-15, Coil coated metals Test methods Part 15: Metamerism 4 EN 13523-22, Coil coated metals Test methods Part 22: Colour difference Visual comparison 5 FprEN ISO 4618:2014, Paints and varnishes Terms and definitions (ISO/FDIS 4618:2014) 6 EN ISO 11664-3, Colorimetry Part 3: CIE tristimulus val
48、ues (ISO 11664-3) This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardizatio
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