Contact angles using water were measured
on five coatings used on aircraft. These
coatings are very uniform spatially but do
exhibit hydration, meaning their contact
angle changes as a function of exposure to
the vapor of the test fluid (i.e., water).
Therefore each contact angle was measured
as a function of time, with t = 0 corresponding
to the first contact of the water with
the dry surface. Two contact angles can be
identified: an initial angle and a steady-state
angle. These surfaces equilibrated in about
15 seconds, as can be seen from the representative
graphs of contact angle versus time
presented below.
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