| Due to
the physical properties of Parylene and the method of deposition,
Parylene 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.
Barrier Properties of Parylene
C
Compared with Epoxies, Silicones, and Urethanes |
