Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit Morning All, I jumped into a thread from Ed Miguel regarding subject: " Effects of flux on board performance" and got a nice reply from Tom Benken ( Thanks Tom ) who sent me an article regarding "Soldering Flux Basics" by Paul Stransky http://www.finishing.com/Library/flux.html I thought I'd start a new thread regarding the cleaning process of flux. Any ideas on cleaning processes to removing flux? We've tried cleaning tests on samples which where soldered using flux less ( No Clean ) solder. Under our conditions the flux from the 'No Clean" solder is affecting our Signal Integrity at high speeds. The flux produced from the "No Clean" seems allot harder to clean than regular solder w/rosin core. One idea was to use regular rosin core solder which may be easier to remove the contaminants with same cleaning process. The following cleaning process tests: * Kester- 20/20 minutes cleaning in ultrasonic cleaner. * Acetone- 20/20 minutes cleaning in ultrasonic cleaner. Signal Integrity was improved with both cleaning processes but there was a small percentage that still had contaminates/film left behind which had effects on high speed testing ( Kester being the worst ). Any comments/ articles/ web info / data would be appreciated :-) Thanks to those who reply, Rich ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu