Dan and Brian
We have qualified clients who clean a no clean and have since the mid 90's  
(Les Hymes was one of the first). But we have found that with a rescue cleaning 
 and only if you have water tolerant parts (if not those need to be removed) 
that  you can effectively clean a residue that was not designed to be cleaned. 
  These residues do need a good saponifier, low pressure inline (not able to 
do in  a standard batch system), heated to 140-150 F wash and rinse with DI 
water at 10  meg ohm or better, but this is not enough by itself but we found 
that if we use  DI steam after wash and before rinse then we are able to clean 
under low  standoff components, BGA's, and with a little help QFN and PQFN 
packages.   We presented this information at the IPC Midwest Expo 2007, authored 
by  Eric Camden.  We have successfully been rescue cleaning for the last 7  
years no clean assemblies that were 6-12 months old.  So it is very doable  but 
standard batch cleaning with a saponifier has not proven to us or our  
customers who we have help implement this type of cleaning that batch or  standard 
inline cleaning is able to do the job.  
 
Terry Munson
Foresite
765-457-8095
 
 
 
 
In a message dated 3/5/2008 10:53:25 A.M. Eastern Standard Time,  
[log in to unmask] writes:

"Generally speaking I have not seen good results in trying to clean  off
no-clean flux. They call it "no-clean" for a reason."

Agreed!!!  Even if you succeed to do the job well - it can be done with 
some fluxes -  it will not be very easy and may be quite costly. I have 
always said, if  you clean, use a flux which was designed from the start 
for easy  cleaning.

¤0.02 worth

Brian

Dan Mauro wrote:
>  Folks,
> 
>  
> 
> I have a need to clean  No-clean residue from PCBA's. Can this be
> achieved with water washer  and some type of saponifier ? Can anybody
> suggest a batch  process?
> 
>  
> 
> Thanks,
> 
>  Dan
> 
> 
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