ASTM D7334-08

Standard practice for surface wettability of coatings, substrates and pigments by advancing contact angle measurement

This standard is used for characterizing the wettability of surfaces. A surface that is easy to wet is one over which a coating is more likely to give good adhesion and appearance and less likely to suffer surface tension-related defects such as crawling, cratering, pinholing, and orange peel.

This standard can also be used to test pigment surfaces for wettability, particularly by potential surfactant- or resin-based dispersants or mill bases. Easily wetted pigments are more likely to be easy to disperse and dispersants/mill bases that wet pigments of interest are more likely to disperse those pigments well.