Hi Steve - I'll have to pay Doug and use his tag line - "It depends"! 
Anytime you mix two different flux systems, especially a water soluble and 
a low residue (aka no clean), there may be an issue of incompatibility 
that could result in a really hard lacquer (best case) or a really cool 
corrosion cell (worst case).  My recommendation would be to advise the 
customer that the mixing of the two flux systems would not be advised 
unless some testing can be conducted to ensure no detrimental reactions 
would occur. A second option would be to check with the flux supplier to 
see if they have any compatibility data. If the fluxes come from two 
different suppliers, don't waste your time asking that question as they 
won't have the answer. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]



From:   Steven Kelly <[log in to unmask]>
To:     <[log in to unmask]>
Date:   06/20/2013 08:02 AM
Subject:        [TN] Mixing solders,
Sent by:        TechNet <[log in to unmask]>



Hi All,
I have been looking in the archives but can't seem to find what I want an 
answer to . I have a customer who wants us to use water soluble RoHS for 
the SMT process but wants no-clean RoHS for the touch-up. Is this 
recommended? Regards Steve Kelly


If the recipient to whom this e-mail is sent has an NDA with PFC Flexible 
Circuits Limited this e-mail is considered confidential and is subject to 
any NDA agreements between the respective parties.

See PFC on "How It's Made`` coming soon on the Discovery Channel!


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________




______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________