What does ASTM F22 test for in relation to surface preparation?

ASTM F22 specifically pertains to the water break test, which is designed to assess the cleanliness of a surface prior to applying coatings. In this test, a surface is evaluated for the presence of contaminants, particularly oils and other residues. When water is applied to a properly prepared surface, it should spread uniformly without forming beads; the formation of beads indicates that oils or other contaminants are present which can interfere with adhesion of coatings.

The focus of this test is on ensuring that the surface is adequately prepared by verifying that it is free from oils or other substances that would compromise the performance of subsequent coatings. This makes it crucial in the surface preparation process, as proper adhesion is essential for the longevity and durability of paint systems. Other tests might focus on different aspects of surface preparation, but the water break test specifically targets the cleanliness related to oils on the surface.