Does anyone have information about the effects of corrosive gases on printed
circuit board assemblies.  Specifically what I am interested in is what
happens to PCB's when exposed to corrosive levels as described in ISA-S71.04
G3 (Harsh) specification, what is the failure mode?  We are conformally
coating our printed circuit boards now to meet this specification but it is
not clear to me what would happen to the PCB if it were not coated.  Do
people meet this specification without conformal coating?
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