Test methods for Surface Properties
(Contact Angle, Wetting Tension, Surface Tension)

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Summary

Wettability is one of important interface properties in many industrial processes such as adhesion, printing, oil recovery etc.
Contact Angle and Wetting Tension are utilized to evaluate Wettability of a solid surface and Wettability of liquid is evaluated by Surface Tension.

Test Methods

Contact Angle Wetting Tension Surface Tension
(Wilhelmy Plate Method)
Sheet, Film Sheet, Film Liquid
(20 ~160°) (30~73 mN/m) (10~180 mN/m)
A droplet(Liquid) is put on a surface of a solid sample and Contact Angle θ is measured as shown in the figure and the scheme below. Standard solutions which have different surface tensions are put on a sample surface one by one. The surface tension of the standard solution is selected as Wetting Tension for a sample when the standard solution fully wets the sample surface for 2 seconds. Wilhelmy Plate(A platinum plate) is contacted with a liquid sample. Surface Tension is measured as the downward force applied to Wilhelmy plate.
ASTM D5946 ASTM D2578  

Search Number 6K001

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