Electronics Forum | Tue Dec 07 17:40:30 EST 2004 | davef
We'd suggest listening to your CSP component supplier. The standoff is too low. Check with your flux suppliers for the information you seek.
Electronics Forum | Thu Feb 16 11:42:29 EST 2006 | russ
I use Alpha 857 W.S. for wave is that what you mean? If so, I love this stuff, it solders everything. one downside to it is convection (wave , rework) can dry it out and leave white hazes and even residues at the joints.
Electronics Forum | Wed Mar 15 08:52:46 EST 2006 | russ
Best way to judge how good a profile is by measuring it. It is not real accurate to determine by the amount of residue left. You should be able to tell if the lead is bent causing the open.
Electronics Forum | Tue Aug 22 21:11:10 EDT 2006 | davef
We agree with Russ. Your topside should be 100 - 130*C. Your 265*F is at the top of the range. Look here: http://www.interflux-electronics.com/Products/Fluxes/IF%202005M/TD%20IF%202005M.pdf#search=%22Interflux%20IF%202005%22
Electronics Forum | Mon Oct 22 08:54:27 EDT 2007 | rgduval
Michael, You're right, of course. A major mis-type on my end. What I meant to say is that no-clean fluxes are designed to not _require_ cleaning to meet industry cleanliness standards. Cheers ..rob
Electronics Forum | Tue May 27 19:32:36 EDT 2008 | mobytahoe
It's all about "exercising" the flux and making sure that what is left over, is benign. When the process is correct, the residue should like like a shadow and present no pooling, lumping, etc.
Electronics Forum | Fri Jul 31 02:59:52 EDT 2009 | dj_jago
I can't open the picture but if it is webbing and you are running with an alcohol based flux (non VOC free) another thing to check is the Specific Gravity.
Electronics Forum | Mon Dec 07 12:01:35 EST 2009 | mikesewell
Alcohol won't do much for the rosin residue, you'll have to scrub which isn't good on your QFP. Can you clean the assemblies before removal? A solvent such as Ensolve or Axarel would be effective on rosin.
Electronics Forum | Sun Jul 14 22:28:37 EDT 2013 | cedric77
1.Weight the paste 2.reflow the paste 3.clean the residue from the reflow ingot 4.weight the ingot By using simple calculation we can extract the percentage of metal or flux loading from the solder paste.
Electronics Forum | Fri Jul 04 06:49:41 EDT 2014 | padawanlinuxero
Hi We had the same problem but it turns out the problem is with the supplier we use a water base flux too, supplier change the solder mask and it work. cheers!
