Bob K,

I'm sure this will ignite a debate but personally, I wouldn't allow any of our boards to be assembled with "no-clean" solder paste.  Perhaps Terry Munson can share with you some photos of why that's a bad idea.  Not all the flux is inerted by the reflow process, so I'm advised. 

Check out his website at http://residues.com/

This paper should give you some ideas
http://residues.com/pdfs/Circuits%20Assembly%20Articles/2004/low%20res/2004.03-The%20Key%20to%20Success%20-%20Circuits%20Assembly.pdf

Also this one
http://residues.com/pdfs/Circuits%20Assembly%20Articles/2003/low%20res/2003.03-Component%20Cleanliness%20in%20a%20No-Clean%20World%20-%20Circuits%20Assembly.pdf

I've visited Terry's facility in Kokomo, IN.  He's got an incredible array of diagnostic instrumentation, some of which he has designed and manufactured himself (like the C3).

Bob Landman
H&L Instruments, LLC


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Wednesday, October 20, 2010 10:10 AM
To: [log in to unmask]
Subject: [TN] Cleanable Long Stencil Time Flux Question

Can anyone make a paste/flux suggestion?

 

 In a past life I once used a No Clean Alpha Metal 6106 paste which had an incredibly long stencil life, I think it was 8 hours.

 

 This stuff never really "Dried Out" and a pasted board could sit for two days and a "Missing Part" could thus be ordered and reflow soldered.

 

 Trouble was NOTHING would remove this no clean flux and trying to wash messy THT or Rework flux could make a real mess.

 

 Can anyone suggest a cleanable paste/flux that has a long stencil life and does not dry out to a hard crust?

 

Thanks,

Bob K.



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