GB/T 11186-2025 Methods for measuring the colour of coatings

Scope

This document describes the basic conditions for measuring the color coordinates of coated films, the measurement methods, and the quantitative colorimetric evaluation methods for minor color differences between coated films. This document is applicable to measuring the color of reflected light, that is, coated films that can display a uniform color (i.e., a single color) when inspected with normal vision. It is also applicable to measuring coated films that cannot completely cover opaque substrates (belonging to opaque system coated films). This document is not applicable to measuring the color of luminescent coated films, transparent and semi-transparent coated films (e.g., coated films used on displays or lamp glass), reflective coated films (e.g., coated films used for traffic markings), and metallic luster coated films (containing effect pigments). Note: There are many formulas for calculating the color difference between two samples based on their color coordinates, but the results calculated using these formulas may not fully coincide with the visual results in all cases. Moreover, the results obtained using different formulas may not be consistent with each other. In 1976, the International Commission on Illumination (CIE) recommended two commonly used formulas. One of them is the CIE 1976 (L*a*b*) color difference formula specified in this document, which has proven to be of practical significance for the colorimetric evaluation of coated films.

Development Information

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