I agree!
I meant to say that if the edges are conductive, they might need to be
exposed
(wait a minute... that IS what I said!)

thanks,
Jack

On Mon, Mar 5, 2018 at 10:18 AM, Douglas Pauls <
[log in to unmask]> wrote:

> Well Jack, sometimes the board edges are metallized so that it serves as a
> grounding path and sometimes as a thermal conduction path.  In those cases,
> the presence of conformal coating interferes with the function of the board
> and so it should not be present.  That is usually the question I ask
> designers all the time - will conformal coating in Location X interfere
> with the form, fit or function of the unit.  If yes, then it is a keep out
> zone.
>
>
> Doug Pauls
> Principal Materials and Process Engineer
> Rockwell Collins
>
> On Mon, Mar 5, 2018 at 10:00 AM, Jack Olson <[log in to unmask]> wrote:
>
>> Typically the goal is to protect conductive surfaces, and board edges
>> don't often have conductive surfaces (and if they do, they might need to
>> stay exposed).
>>
>> If you have seen the board edges coated it is probably a result of the
>> method that was used to coat them (spraying or dipping), not because it was
>> required.
>>
>>
>>
>> On Thu, 1 Mar 2018 09:45:26 -0600, Caitlen Gahm <
>> [log in to unmask]> wrote:
>>
>> >Greetings,
>> >
>> >We are wondering what the general thought is regarding whether or not
>> the edge of a CCA/PWB needs to be conformally coated?  We received CCA's
>> from a supplier and noticed that the edges were not coated.  Our thinking
>> thus far is that since our drawing does not state that coating on the edge
>> is optional or not required, it would be required.
>> >
>> >What we are curious to know is what the general consensus is regarding
>> whether or not it is necessary to coat the edge of the CCA and instances
>> when this would or would not be desired.
>> >
>> >Thank you,
>> >Caitlen Gahm
>> >Materials and Process Engineer
>> >Crane Aerospace & Electronics
>>
>
>