This part of EN 13523 describesThe procedure for determining objectivelyThe chalking resulting from natural orartificial weathering of an organic coating on a metallic substrate.The advantage of this procedure for measuringimmediately on an instrument. Subjective judgementspecimens is not necessary.g o an orgarnc co歇in gby visual comparison ofchalking fating isthatThe result can be read offtest specimens with referenceExperience to date withThis testresults can only be obtained byapplication toThe test surface.method has been based mainly on artificially weathered specimens. Reproduciblecareful execution of the test. Special attention is paid toThe adhesive tape and its月The test method is not applicable to embossed coatings. InThe case of textured coatings,The degree of texture willinfluence readings. Also dirt collection may influence readings on outdoor weathered specimens.NOTE Different methods for assessing chalking are in use.The results of these different methods are notcomparable.