Anyone know of a reference for RH thresholds for moisture condensation on an uncoated assembled PCB?  My intuition tells me to expect that condensation will initiate in tiny cracks at RH levels below 100%.  I found some references for this effect with some ceramics, but nothing on PCB assemblies.  I'm trying to advise my customer to conformal coat if he really wants to pass a test at 95%.

Thanks,

Wayne Thayer

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