Hi Bruce,
It's time for the weekend.
The materials have distinct differences in intended purpose and properties.
One to prevent solder attachment to conductive surfaces during processing
and the other to provide limited environmental protection, mechanical
support and vibration dampening.  I would suggest using each for it's
individual purpose but, having said that, I've also seen what you suggest
used for some commercial products. Can't recall any class 3 applications
though.  I suppose it depends a great deal on the purpose of the product and
the environment that it will see during performance. Class 3 definition of
product classification can be quite varied as I'm sure you are aware.



Mel Parrish
Soldering Technology International
102 Tribble Drive
Madison, AL 35758
256 705 5530
256 705 5538 Fax
[log in to unmask]
www.solderingtech.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Misner, Bruce
Sent: Friday, May 17, 2002 12:10 PM
To: [log in to unmask]
Subject: [TN] Conformal Coating


I have a CM that precision spray coats UR with an x-y programmable gantry
system.  They would like to avoid coating large areas of the board that have
no components but DOES have conductors covered by solder mask over bare
copper. The boards are all Class 3,  4 layers, some designs Tin/lead plate
finish, some solder dipped finish, some .062 thk, some .125 thick.

They are requesting a change of wording on the drawing to read: Coat all
components, leads, solder joints and exposed circuitry per J-Std-001.  Does
anyone have serious concerns with this approach?

Bruce Misner

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