I've had one customer who asked for protection from Sulfuric gas and we
applied Parylene. It passed their testing but I do not have the results.
There is plenty of data out there on the barrier strengths of Parylene so
it should not be hard to find. I always recommend testing though, to verify
it will work for the individual application.

Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com


On Wed, Jul 30, 2014 at 3:03 PM, McGlaughlin, Jeffrey A <
[log in to unmask]> wrote:

> Have they looked into Parylene (poly-paraxylylene) coating. The coating is
> thin mechanic lay and thermally stable and will withstand  exposure to most
> chemicals including Hydrofluoric Acid.
>
>
> Jeffrey McGlaughlin, C.I.D.
> Engineering Designer
>
> Battelle
> 505 King Avenue
> Columbus Ohio 43201-2693
> [log in to unmask]
>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Jackson
> Sent: Wednesday, July 30, 2014 12:48 PM
> To: [log in to unmask]
> Subject: [TN] Conformal coating for Sulfur environments
>
> We have a customer whose PCBAs are subjected to flower of sulfur rich
> environments. The sulfur quickly corrodes any area not covered in
> soldermask. They would like to use a conformal coating but their
> research to-date has only come up with one solution which has published
> data specifically concerning sulfur and the coating is too viscous for
> their application.
>
> Does anyone have experience with a conformal coating which is proven to
> survive in an environment with sulfur?
>
> Any help would be greatly appreciated.
>
> Thanks,
>
> Paul
> Omni Circuit Boards
>
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