This document specifies a test method to measure the contact angle
for the determination of the surface free energy of a solid surface. The method
can be applied for the characterization of substrates and coatings.
NOTE 1 For the determination
of the surface free energy of polymers and coatings, either the method in accordance
with Owens, Wendt, Rabel and Kaelble or the method in accordance with Wu is
used preferably.
NOTE 2 The morphological and
chemical homogeneity have an influence on the measuring results.
NOTE 3 The procedures
indicated in this document are based on the state-of-the-art employing the drop
projection method in penumbral shadow. Other methods are not excluded.
NOTE 4 Measuring the contact
angle on powders is not part of this document. For further information, see the
bibliography.
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