Parylene exhibits
very little
absorption in the
visible region and
is, therefore,
transparent and
colorless. Below
about 280 mu both N
and C absorb
strongly. Although stable
indoors, the
parylenes are not
recommended for use
outdoors when
exposed to direct
sunlight.
Ultraviolet Spectra
of Parylene C and N
Both parylenes are
relatively
featureless to at
least 50 micron
wavelengths (except
for a few
characteristic
peaks), especially
in thin film form
(<1 u).
Radiation and
Weathering
Resistance
Parylene C and N
films show a high
degree of resistance
to degradation by
gamma rays in
vacuum. Tensile and
electrical
properties were
unchanged after 100
megarad dosage at a
rate of 1.6 megarads
per hour. Exposure
in air leads to
rapid embrittlement.
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