Historical
ASTM D1331-14
Standard Test Methods for Surface and Interfacial Tension of Solutions of Paints, Solvents, Solutions of Surface-Active Agents, and Related Materials
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 Noüy ring.
Method B—Interfacial Tension by du Noüy ring.
Method C—Surface Tension by Wilhelmy plate.
Method D—Interfacial Tension by Wilhelmy plate.
1.2 Method A originally was written primarily to cover aqueous solutions of surface-active agents, but is also applicable to aqueous paints, nonaqueous solutions (including paints) and mixed solvent solutions.
1.3 Method B is applicable to two-phase solutions. More than one solute component may be present, including solute components that are not in themselves surface-active.
1.4 Method C is applicable to surface active liquids and, unlike du Noüy ring, no buoyancy corrections are needed and results are not affected by moderate viscosities (1-10 Pa-sec) of the liquid. It is the recommended method for use with paints and resin solutions.
1.5 Method D is applicable to two-phase solutions and mixtures.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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