Well, until Ian Fox chipped in his pennorth, I was going to explain:

In the old days, only circuits operating in really hostile environments would be coated. Board delamination was of concern especially when the MOD and DOD were considering NBC protection. As the edge of the assembled board doesn't even have a solder resist, it was always felt that coating the edges was important.

I dare say that technology has moved to address such an issue though I wonder whether some of the extreme voltages that are being considered, 800v to >1200v might require this to be re-assessed?

So, if that was a half-fractional question, maybe this will be considered a half-baked response? Please answer in an orderly fashion….

Graham Naisbitt
 
On 26 Mar 2013, at 15:42, Douglas Pauls <[log in to unmask]> wrote:

> OK, the conformal coat question of the day:
> 
> Do you conformally coat the edges of a printed circuit assembly?  Why or 
> why not?
> 
> OK, that is two questions, or perhaps a half fractional question.....
> 
> Doug Pauls
> 
> 
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