Paresh,
          
          There is no real standard that I'm aware of for visual residues of 
          no-clean flux. You may have to develop your own visual acceptance 
          criteria for cosmetic reasons. Will it create a problem in the field? 
          Probably not, since most no-clean flux residues are inert. If you've 
          ever worked on TV's or stereos, you will see gobs of rosin flux 
          residues on the circuit boards, yet many of these electronic devices 
          continue to operate for over 10 years. However, reliability depends on 
          the flux type. Get a spec. sheet for the flux and core solder, and 
          look at the following IPC and Bellcore reliability test results: 
          1)Copper Mirror; 2) Halide; 3)SIR; 4)Electromigration.
          
          Regards,
          
          Greg Kilinski
          Acuson Corp.
          [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Assy:Flux residue on SMC
Author:  [log in to unmask] at ccUnix
Date:    8/14/96 10:15 AM


Hello everyone,
We have one SM chip on our boards which is put on by a contractor.  Lately, 
we are seeing excessive flux residues on and around the pads.  The residues 
have  look of frosted crystals.  The flux used is a no-clean flux.
          
Is it acceptable for these residues to be there?  Will it create any problem 
now or later?  What is acceptability standard?
          
Thanks for your help,
Paresh Patel
Oneac Corp.
(847)816-6000 x-704.
          
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