ISO 13076:2019 Paints and varnishes – Lighting and procedure for visual assessments of coatings

ISO 13076:2019 Paints and varnishes – Lighting and procedure for visual assessments of coatings.
This document specifies the lighting and the procedure for the visual assessment of degraded areas, spots or other defects on or in coatings.
This document is not applicable to the visual comparison of colour, which can be assessed using ISO 3668.
NOTE See Annex A for examples of the possible applications of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of’ their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4618, Paints and varnishes — Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
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4 Principle
The panel is visually assessed under specified conditions of illumination for degraded areas, spots or other defects.
5 Apparatus
5.1 Fluorescent lamp or dull LED (light-emitting diode), comprising a wide-angle light source with an aluminium-coated reflector positioned to reflect the light downwards (see Figure 1), a colour temperature of 6 500 1< and a degree of colour rendering index (CR1) of 9 (corresponding to colour rendering class 1A, i.e. a CR1, Ra, of 90 to 100). This colour temperature is realized in the CIE standard illuminant D65, as described in CIE 15:2004. NOTE 1 This colour temperature and colour rendering give the light colour 965. 6 Procedure for visual assessment 6.1 General Either natural or artificial daylight may be used for routine assessments. However, precisely controlled artificial lighting shall be used for arbitration purposes since the properties of natural daylight are not constant and evaluations in natural daylight can be influenced by the surroundings. 6.2 Assessment in natural daylight Diffuse daylight, such as that which falls from a partly cloudy sky on a north-facing test panel (southfacing in the southern hemisphere), should preferably be used, The areas to be assessed, and the areas surrounding them, shall be uniformly illuminated with an illuminance which shall be not less than 2 000 lx. Direct sunlight shall be avoided. 6.3 Assessment under artificial lighting Assess the coating under a fluorescent lamp or a LED (S1). hold the test panel at a distance from the lamp such that the illuminance at the surface of the coating is not less than 750 lx (see Figure 1).ISO 13076 pdf download.