Joe,
AIM has customers that conformal coat over our no-clean solder paste residues. In general the
success of this operation depends on the paste in use, the coating in use and the coating process.
You may find a report of some of our findings about this at
http://www.aimsolder.com/techarticles/Conformal%20Coatings%27%20Compatibility%20With%20AIM%20Flux%20Residues.pdf
This report concludes that many solder flux chemistries are compatible with coatings, although
slight process adjustments were necessary for certain products. When encapsulating no-clean flux
residues, process techniques can be as important as the particular encapsulate being used. Curing
encapsulates too rapidly can melt the flux residue, which can inhibit curing. Therefore, a slower,
cooler cure rate that is within the specified limits of the encapsulate is suggested. Furthermore,
if a high-solvent spray material is applied too wet, the solvent will soak into the flux (especially
paste residues) and cause blow-holes during final cure. Therefore, utilizing a thinner, lighter coat
when using these materials is recommended.
Regards,
David Suraski
AIM
+1-401-463-5605
www.aimsolder.com
----- Original Message -----
From: "Macko, Joe @ IEC" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 28, 2004 6:57 PM
Subject: [TN] conformal coat over no clean flux residue
> Fellow Techeads,
>
> It has been suggested by one of our CMs that it is acceptable to conformal
> coat (type AR) over no clean flux residue. Would anyone like to share their
> opinions or experience on this subject. Conformal coating over residue does
> not sound like the correct thing to do. thanks
>
> joe
>
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