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
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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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