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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