Advantages of diX Coating
diX C
|
Useful
combination of
physical,
electrical and
chemical
properties.
MIL-SPEC.
I-46058C
Approved and
UL94 V-0
Approved.
|
diX N
|
Non-halogen.
Good for medical
applications.
High
electrical
properties.
|
-
diX C and
diX N
Parylene
coating
materials
are very
high in
purity-above
99%. High
purity
eliminates
residue and
stains in
coating
machines,
doesn't
cause
offensive
odors due to
decomposition
of
impurities
and has high
gas barrier
properties.
-
Coating
thickness of
the material
ranges from
the micron
range to
millimeters
while
maintaining
a perfectly
uniform,
clear thin
coating.
-
Applied in a
non-liquid
form, which
creates a
thin uniform
coating that
is pinhole
free. A
non-liquid
coating
eliminates
sagging,
bridging
between
surfaces,
puddling and
pinholes.
-
High
resistance
to chemical
solvents and
moisture
creating a
coating that
can
withstand
harsh
conditions.
-
Covers all
surfaces
left exposed
allowing
coating of
hard to
reach places
that would
otherwise
provide
enormous
obstacles
with other
coating
materials.
-
Optical
Clarity-diX
Parylene
coating
material is
a
transparent,
colorless
film ideal
for optical
applications.
|
Coating Process
of Parylene
Dimer-Gas Phase
Deposition
The products to
be coated must
first be cleaned
and masked and
are then placed
in the
deposition
chamber. One
important fact
about parylene
coating and the
reason it is so
advantageous is
that the coating
applications are
done at room
temperature.
Next, dimer is
then placed in a
glass tube in an
aluminum foil
cup called a
"boat".
The process then
begins when an
end cap is
placed over the
glass tube.
Dimer is then
changed from a
solid into a
vaporized gas
because of
reduced pressure
at the other end
causing the
molecules to
move down the
tube. In the
pyrolysis zone,
the gas is
heated to higher
temperatures
(680oC)
and then cleaved
into the
reactive
monomer,
para-xlylyene,
which is
critical for the
process. The
monomer
molecules then
enter the
deposition
chamber and
re-form as a
long-chain
polymer on all
exposed
surfaces.
Film growth then
continues in the
deposition
chamber creating
a coating
surface that is
pinhole free and
is able to reach
the deepest
crevices and the
sharpest edges
in uniform
manner.
A cold trap is
used between the
deposition
chamber and the
vacuum pump to
prevent parylene
molecules that
did not deposit
in the chamber
from reaching
the vacuum pump.
It also prevents
"backstreaming"
of oil molecules
into the
deposition
chamber.
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