Julie

The compatibility of coatings and masks is always a subject of doubt
unless you use similar chemistry for both. In my book, I recommended not
to use a solder mask if you intend to coat, provided you can get away
with it. Certainly, "no-clean" fluxes require compatible masks and this
is a subject for qualification testing: also on the degree of cure of
the mask. As a general rule (but not absolute), the order of quality of
masks are: (worst) dry film, LPI and UV screenable, 1-component
screenable and 2 component screenable (best). BTW I do not recommend
coating on top of "no-clean" residues, except under very specific
circumstances where the residues form part of the polymerisation
reaction chain -- and even then ...

Brian

Julie Dixon wrote:
>
> Dear Net,
>
> Has anyone ever heard of a problem with adhesion of conformal coating being
> caused from UV soldermask? Will no-clean fluxes at assembly plants react
> differently to different types of soldermasks or LPI?
>
> Thanks,
> Julie Dixon
>
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