1.1 ,These test methods cover the determination of surface tension and interfacial tension of a variety of liquid materials, including but not restricted to paints, solvents, and solutions of surface-active agents, as defined in Terminology D459. Four methods are covered as follows:

Method A—,Surface Tension by du Noü,y ring.

Method B—,Interfacial Tension by du Noü,y ring.

Method C—,Surface Tension by Wilhelmy plate.

Method D—,Interfacial Tension by Wilhelmy plate.