DIN EN ISO 8130-12:2011-02

This part of ISO 8130 specifies a method for the determination of the tendency for the mixing of two different coating powders to result in the deterioration of the surface quality of the final coating. The results depend on the following characteristics of the coating powders: a) their chemical reactivity; b) their chemical composition; c) their melt properties. The onset of the deterioration in appearance, its nature and its extent will depend greatly on the ratio in which the powders are mixed. The test is useful in predicting the possibility of incompatibility arising from mixing different powders both during the manufacturing process and during the application of coating powders. The nature of the deterioration in surface appearance may manifest itself in various ways, including: - change in gloss level; - the presence of pinholes, including micro-pinholes; - the presence of craters; - the appearance of orange peel; - the presence of bittiness (graininess); - the presence of colour contamination. Deterioration of mechanical properties can also be inspected. However, this part of ISO 8130 is only concerned with changes in appearance. The Committee responsible for this standard is NA 002-00-07 AA "Allgemeine Prüfverfahren für Beschichtungsstoffe und Beschichtungen" ("General test methods for coating materials and coatings") at DIN.