Parylene is the generic name for the poly-para-xylylenes.These
Parylene materials form linear, highly-crystalline polymers but can
be usefully produced only as coatings and films. The most commonly
used is Parylene C, the mono-chloro substituted compound. Parylene
N, the un-substituted compound, has better high-frequency
dielectric properties, better penetrating power for coating the
bore of very small diameter tubes, and is often preferred in
medical applications. Parylene D, the di-chloro-substituted
compound, has better high temperature endurance.
