Ioan,
        IPA is OK to use to clean solder paste off OSP coated boards.  We
use it all the time.  HOWEVER, the IPA does remove the OSP coating; so the
boards must be immediately returned to the production line and built.  Don't
clean them and then let them sit for a while.

Good Luck
Ryan Grant
MCMS Inc.

> -----Original Message-----
> From: Tempea, Ioan [SMTP:[log in to unmask]]
> Sent: Thursday, May 11, 2000 6:19 AM
> To:   [log in to unmask]
> Subject:      [TN] More OSP
>
> Thanks for the feedback.
>
> Guess what: yesterday I checked Circuits Assembly and there it was, an
> article on OSPs by a guy called Michael Carano (any relationship with my
> contributor?). OK, it covers mostly the PCB fab part, but it gave me an
> idea
> of what this is and that, once again Technet proves to be an impressive
> resource of knowledge.
>
> Now, since I have more questions, back to business:
> - are OSP sensitive to hand touch? Will the skin oils degrade the coating,
> or the boards can be handled like HASL ones?
> - as some qualified oppinion reached me, misprinting is bad. If it
> happens,
> what to use for paste removal and how to do it? Looks like the IPA will
> damage the OSP and IPA is what we are currently using.
> - what coating thickness should I specify to make sure the board will
> easily
> take 2 reflows plus 2 selective soldering cycles?
> - where could I find in depth resources on OSP?
>
> Best to all,
> Ioan
>
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