Genny -

As a general rule, mixing flux chemistries can be anywhere from a very
benign to a very difficult situation. It can run the gamut. You really
should test the residues left after cleaning both for ionic contamination
and Surface Insulation Resistance (SIR) as a minimum. Either way, with the
RA flux you need to clean the boards.

Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com

----- Original Message -----
From: "Genny Gibbard" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 18, 2001 1:24 PM
Subject: [TN] No Clean and Rosin core on same PCB


> Hello,
> We have CM's that use no-clean solder paste on our PCB's.  We have not
given
> the CM any spec other than that it be approx. 60/40 tin-lead.  In house,
> however, for hand assembly we have always used solder such as Kester "44"
RA
> core solder.  We're working on a new OEM product and the customer has
> expressed concerns about mixing the two on the same PCB.  We also use a
> safety wash board cleaner.
> Any thoughts or concerns that we should address?
>
> Genny Gibbard (mailto:[log in to unmask])
> Product Transition and Support
> Wavecom Electronics Inc.
>
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