Electronics Forum | Tue Feb 06 23:01:44 EST 2007 | Wayne
The QFN is found to have contact problem during FCT. The paste that I am currently using is SnPb 63/37 water soluble paste. Is it because of water soluble paste? (unable to clean after reflow process as QFN is entrapped by paste/flux) Should we use
Electronics Forum | Tue Dec 28 21:02:15 EST 1999 | Jim
Hi Rick, Water soluble flux is heatee, deionized water. So, use DI, and keep it heated. It is also important that the water be moving, so that fresh water is continually being presented to the fluxed surfaces, and the flux-laden water is continually
Electronics Forum | Mon Oct 31 17:01:54 EDT 2011 | kahrpr
What kind of flux/solder paste are you using water soluble or no clean
Electronics Forum | Tue Aug 30 07:01:52 EDT 2005 | edgetech
EdgeTech SMT Tech here. I was questioning the process our Engineers are using concerning Water Soluble solder paste. I have no experience with this paste. I was wondering what need so be done differently when using this paste. As far as I know the on
Electronics Forum | Tue Feb 13 16:28:17 EST 2007 | rob_thomas
There are solder pastes that seem to give you less voiding. Currently we are using Kester ,water soluble paste that gives us pretty good results on BGA's up to 0.5mm pitch. Stencil design was a challenge but we are getting consistent results . Here
Electronics Forum | Tue May 02 14:38:06 EDT 2006 | bhall
Currently I am using a water soluble solder paste and no clean wire solder. For awhile now I have been pushing to switch to no clean across the board. Can anyone give me an idea of how this will effect production? Switching to no clean will allow m
Electronics Forum | Mon Feb 01 09:17:45 EST 2016 | spoiltforchoice
You can buy an awful lot of stencils for $200K > but where/how are you going to store all of those > stencils? There is a certain $$$ value to all > the space it will take to store them. > > I have > been told by a Mycronic salesman that they a
Electronics Forum | Mon Dec 15 15:34:17 EST 2008 | dyoungquist
Sorry it has taken me so long to respond. I got pulled off onto other projects and was not able to work on the solution to the problen until recently. The solution we have come up with is to change from no-clean flux based solder paste to water sol
Electronics Forum | Fri Apr 03 02:52:42 EST 1998 | Jacqueline Coia
At this moment in time we are using water soluble solder paste on our PCBs these are cleaned using water only, agitated with ultrasonics. After drying a white/grey residue is left around solder joints. Reflow profile is fine and a reliable wash proce
Electronics Forum | Fri Jun 25 12:10:34 EDT 2004 | tcp
We use water soluble paste, Kester R560. These units are wave soldered and cleaned in an Electrovert Aquastorm water wash with a 3% Kester saponifier solution in the first stage.
