Barrier Properties
Due to the physical
properties of
Parylene and
the method of
deposition,
Parylene
conformal
coating forms
a pin-hole
free film on
the subject
substrate. Therefore,
it provides
an excellent barrier
to both liquids
and gases. The
table below
lists the permeability characteristics
of the Parylenes
and also
shows typical values for other types of conformal
coatings.
Moisture vapor
permeability
values have
been measured
at thickness¹
below 0.1 micron.
Normalized to
equivalent thickness,
the values
are the same
for all thicknesses.
Assuming that
parylene C at
0.001 inch is
pinhole free,
then parylene
C films at 0.1
micron (~ x
10-6 inch) are
also pinhole
free.