BS EN 13523-22-2010 卷材覆层金属.试验方法.色差.视觉比较

标准号：BS EN 13523-22-2010
中文标准名称：卷材覆层金属.试验方法.色差.视觉比较
英文标准名称：Coil coated metals - Test methods - Colour difference - Visual comparison
标准类型：A29
发布日期：2010/6/30 12:00:00
实施日期：2010/6/30 12:00:00
中国标准分类号：A29
国际标准分类号：25.220.60
引用标准：EN 13523-0-2001;EN ISO 3668
适用范围：This European Standard specifies the procedure for determining the difference in the colour of an organiccoating on a metallic substrate by visual comparison against a standard using either diffuse natural daylight orartificial daylight in a standard booth.NOTE Results might differ between natural and artificial daylight.It might be that two colour specimens will match in daylight but not under another light source. Thisphenomenon is known as metamerism (see EN 13523-15).If 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 derivedare neither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, thisprocedure 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 comparisoncan be useful (evaluation of colour matches, inspection of metallic colours, etc.).The standardization of such visual comparisons, by light sources, illuminating and viewing geometry andspecimen size, provides for improved uniformity of results. This practice is essential for critical colourmatching and is highly recommended for colour inspections.