Does anyone in this group have experience with variations in the appearance
of parylene coating? Our vendor is applying parylene on a small PCB. Most of
the boards still exhibit the glossy finish of the original board mask but we see
some units that have a distinctly dull or matte finish. Sometimes it is limited
to one end or even a corner of the board. The vendor reports that this
reflects a slightly thicker deposition of the parylene coating and is not a cause
for concern. Can anyone confirm this, or are there other ideas that might
explain this condition? Thanks for your help.
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