PAINTS AND VARNISHES - COATING
POWDERS - PART J12: DETERMINATION OF
COMPATIBILITY
(ISO 8130-12:1998 (2003), IDT)
This Malaysian Standard is one of a series of standards dealing with the sampling and testing of paints and varnishes and related products.
It specifies a method for 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 the coating powder.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;
- th
