Terry

Has the assembly been cleaned properly? Paralene really does not take  
to no-clean assemblies.

I would be very wary of the comment that there is uneven coating  
thickness - Paralene is deposited onto all surfaces in a vacuum  
chamber, ever so thin.

Kindest regards,

Graham Naisbitt

Gen3 Systems Limited

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On 30 May 2007, at 13:45, Terry Quinn wrote:

> 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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