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May 2007

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Subject:
From:
Terry Quinn <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Terry Quinn <[log in to unmask]>
Date:
Wed, 30 May 2007 07:45:38 -0500
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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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