Is there any information on products with No-Clean flux being effected by 
moisture over a period longer than that tested in SIR tests with the SIR comb 
test coupons? Some customers make products for vehicles and toys that are 
subject to more humid conditions. The No-Clean fluxes used always pass SIR 
which have high resistance values even after 196 hours. However  if the 
humidity levels rise and fall but never to the point of drying out the moisture. I 
thinking that the humid spring and summer months could be a problem if not 
sprayed with a conformal coat. The other situation I'm testing is when a 
moisture sensitive part is used. Tests on three of the boards showed that the 
moisture sensitive part was dragging the surface insulation down. When I 
localized the heating to this part with a small Leister heat gun, the resistance 
across the battery terminals with the battery removed went back to infinity. 
Usually the moisture sensitivity is a factor relative to the SMT reflow process 
and not an issue in operation. Any info on this? PS this batch was the first 
ones using Pb-Free solder paste and that means I'll have to check if the BOM 
changed to a different RoHs version of this special moisture sensitive part.

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