gEDA-user: High voltage caps in small places

[Ethan Swint <eswint.ramu@xxxxxxxxxxx>]

Interesting study sent to me by a friend - Johanson Dielectrics has a 
study posted to Digikey:
http://dkc1.digikey.com/us/en/tod/JohansonDielectrics/PCBDesign_NoAudio/High_Voltage_PCB_Design_for_Arc_Prevention_NoAudio.html 

Summary:  For high voltage (>1kVac), small (1206, 1808) caps, it's bad 
to leave soldermask between the terminals of the device, particularly in 
humid conditions.  Rounding the pads is beneficial on 1206, but not so 
much on 1808.  I wonder what materials are available for soldermask and 
if they have higher moisture resistance?  Is soldermask polyimide?

-Ethan


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