Hivatkozási szám

MSZ EN 13523-3:2022

Dokumentumazonosító

178210

Cím

Tekercselt, bevont fémek. Vizsgálati módszerek. 3. rész: Színeltérés és metaméria. Műszeres összehasonlítás

Angol cím

Coil coated metals. Test methods. Part 3: Colour difference and metamerism. Instrumental comparison

Alkalmazási terület

This document specifies procedures for determining the instrumental colour difference (CIELAB) of an organic coating on a metallic substrate compared to another one used as a reference (usually called reference) and the metamerism depending on the illuminant. When two colour specimens have identical spectral reflectance curves, they are matching under any illuminant irrespective of its spectral characteristics. This is termed a “spectral match”. It is also possible for two colour specimens having different spectral reflectance curves to match visually under a given light source but not to match under another light source with different spectral characteristics; such matches are termed “metameric”. One quantitative description of metamerism is the so-called “metamerism index”. Information on the metamerism index is of limited value where ?E (instrumental colour difference for a given illuminant) is > 0,5. The metamerism index is not suited for determining the absolute colour difference or colour consistency of a given specimen at change of illuminant. The colour difference under the reference illuminant is to be measured in colour coordinates L*, a* and b*. Excluded from this method are organic coatings producing fluorescence and/or which are multicoloured, pearlescent or metallic. Establishing a reference as well as the magnitude of an acceptable colour difference are not covered by this method. Two methods are given in this document: a) instrumental colour difference measurement using a tristimulus colourimeter; b) instrumental colour difference measurement using a spectrophotometer or equivalent. It is advised that care is taken when measuring e.g. — textured surfaces; — fluorescent coatings; — metameric coatings; — multi-coloured, pearlescent, metallic or special colour effect coatings.

ICS

25.220.60 Szerves bevonatok

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2022-03-01

Forrás

idt EN 13523-3:2021

Előd

MSZ EN 13523-3:2014, MSZ EN 13523-15:2016

Utód

Módosítás

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

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