Hello Andre,

From our experience and testing we have noticed lead free RMA, lead free
soft probable synthetic fluxes (no-clean), and, lead free hard
non-probable synthetic fluxes are more difficult to remove than
comparable eutectic soldered connections.  Based on our observations and
available information, we've reasoned that the increased difficulty
relates to the higher reflow temperatures, and, formulation variations.
That said, water soluble lead free fluxes are typically not more
difficult to remove.  We have seen a need to apply application
engineering and R&D efforts towards developing technology to more
readily remove both synthetic fluxes and lead free fluxes.  These
efforts are realized in machine enhancements which perform better while
at a reduced associated operating cost.

Shean Dalton
Austin American Technology
512-335-6400 ext. 20
[log in to unmask] <mailto:[log in to unmask]>


-----Original Message-----
From: Andre Leclair
Sent: 5/12/2004 9:27 AM
To: [log in to unmask]
Subject: [TN] Aqueous Washes & lead free


Morning all
I have been noticing lately a number of Wash manufactures advertising
their
machines for Lead Free assembly processes.
Are boards assembled using fluxes designed for the higher reflow temps
(Wave or SMT) harder to remove with older washes ?? or is this an
advertising gimic to try and sell new machines??
We currently have 2 older Westkleen (Triton IV & Formula 3MT) and are
looking at introducing a lead free line next yr.

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