Bob,

I would have to echo Brian's comments... I did some SIR testing on a slightly out of control spray fluxing process, in which I was investigating the effect of overspray and capillary action.... The results on the SMT side were truly frightening.  I wouldn't recommend applying no-clean flux to the component side - maybe just find a slightly more active no-clean flux that gives the wetting you desire, or go back to cleaning of a more active flux full-stop, would be my advice if you need any kind of reliability on this assembly.

Best Regards,

Phil Kinner
Chief Chemist

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  ----- Original Message ----- 
  From: Bob Arciolla 
  To: [log in to unmask] 
  Sent: Friday, June 14, 2002 7:05 PM
  Subject: [TN] fluxing the top side of printed circuit board


  Is it okay to either spray or apply flux to the component side of the printed circuit board. We are using Kester 951 no clean flux.

  Thanking you, 

  Bob Arciolla 
  [log in to unmask]