>> I'm beginning an evaluation of no clean solder pastes.
I was wondering what pastes fellow technetters are using, and
their production environment.>>

James,
A few months ago, we finished a big evaluation of low solids solder pastes.
We settled on Indium SMQ92J and Alpha Metals UP-78M as our two preferred
pastes.  When I was at CSL, I evaluated both materials for several clients
and it always had excellent residue characteristic by ion chromatography,
as well as excellent SIR performance.  If you are looking at materials to
consider, I would also add Kester 256GS to your list.  It has also done
very well in my evaluations.  Multicore also makes a good low solids paste,
but the exact designation escapes me for now (something in their X-32 or
X-33i series, if I recall).  I am sure many of the other paste
manufacturers have decent low solids pastes, but my experience with those
is limited.

Look for a J-STD-004 qualified paste, with an ROL0 designation.  If you are
going to no-clean assembly, avoid halides like the plague.  A plus would be
if the paste is also Bellcore compliant.  I can talk more off-line, if'n ya
want.

Doug Pauls
Rockwell Collins

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