environmental sulfur test (as per std ionic mixture in RH chamber) might be, pulp and paper industry grade of computer control system might have some lesson to learn paper back in mid 90s. it is all in the design, you need to keep majority of the stuff away, and dealt with what ever left of few.... if you are talking about oil and gas industry, that is different stuff all together... in conclusion, you need to deal with it at system level,not assembly or sub-assembly level... based on a coating to block sulfur ingress is risky the least... imo. jk On Jul 30, 2014, at 12:47 PM, Paul Jackson wrote: > 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 > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud > service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________