At the high temperatures needed for 5Sn/95Pb normal flux rosins will tend to
oxidatively degrade / pyrolise , this makes for a tough cleaning job as you
are no longer trying to clean resins.
Speak to your cleaner company to see if they have an alternative material -
their material recommendation could be based on the assumption you are
cleaning regular tin/lead which reflows ~100C lower.
If you can flood the work area with nitrogen when soldering that will
mitigate the problem.
Or you could try a high temperature resin/temp stabilised rosin flux type.
or combos of the above.
Regards
Mike Fenner
Indium Corporation
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of jonathan noquil
Sent: Wednesday, January 21, 2009 7:22 AM
To: [log in to unmask]
Subject: [TN] UMICORE PASTE
Hi techies:
Does anybody from here had an experience on UMICORE solder paste?
I am using 95/5Sn from UMICORE and they claim it as no clean flux.
However
residues are teribble.
I have problem on removing these residues. The flux residue is dark some
sort of it is burned or charred. And really difficult to remove during
flux
cleaning using Ionox 1332?
I encountered lots of wirebond non-sticks.
Is this normal to UMICORE/Microbond pastes?
Hope to hear from all of you.
regards
Jon
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