ASTM D8597-24

Standard Test Method for Surface Wettability of Coatings, Substrates, and Pigments by Contact Angle Measurement Using Portable Goniometers

This test method is useful 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 cratering, pin holing, orange peel, and fish eyes. Contact angles can be used to measure immediate wettability of surfaces as well as changes due to aging or effects of wear, for example changes in a water repellent coating or film with exposure to environmental or wear testing.

This test method covers the measurement of the angle of contact of a drop of liquid applied to a surface when using a portable (that is, handheld) goniometric device to deposit the liquid and obtain the measurement.