Hi Tony, we experienced poor wave soldering after 2 reflows with immersion tin. So, please give me a few hints on SERA. Is it a test that the board house will do, or it has to be at our incoming? Does it imply additional charges? Where can I read more? Thanks, Ioan > -----Original Message----- > From: tony steinke [SMTP:[log in to unmask]] > Sent: Wednesday, June 19, 2002 11:19 AM > To: [log in to unmask] > Subject: Re: [TN] Immersion Tin > > Grant, > Having installed the Cookson(Dexter) FST chemistry a couple of years > ago at my previous employer, there are concerns that you should be aware > of. > The immersion tin > process is a beautiful thing if applied and processed properly. Some of > the > major > issues that I experienced were: > Solder mask adhesion(you should tape test any incoming product) > Request that SERA(sequential electromigration reduction analysis) test be > performed. > And the biggest problem was getting acceptable solderability on second > pass > wave solder > or second pass solder paste. The copper migration greatly accelerates > during > any thermal > excursion, but that is what the SERA testing will show you. > Tony Steinke > [log in to unmask] > > ----- Original Message ----- > From: "Grant Emandien" <[log in to unmask]> > To: <[log in to unmask]> > Sent: Wednesday, June 19, 2002 3:06 AM > Subject: [TN] Immersion Tin > > > > Members, > > > > A PCB supplier has requested us to evaluate immersion tin as a finish. > > Immediate concerns raised were shelf life, solderability, whiskers, etc. > > Researching the archives has noted similar as well as opposing views and > > concerns. In addition to possible problems arising from immersion tin > > finish, what PCB fabricator process changes may contribute to possible > > reliability and solderability concerns and how this impacts production > > processes such as reflow. The proprietary chemistry used is MacStan HSR > from > > Macdermid. > > > > Anyone willing to share experiences and guide me towards making an > informed > > decision. > > > > TIA > > Grant > > > > > > ********************************************************************** > > Notice: > > > > This email transmission contains confidential information which is the > property of the sender. The information is intended only for the use of > the > addressee. If you are not the intended recipient, you are hereby notified > that any disclosure, copying or distribution of the contents of this > e-mail > transmission, or the taking of any action in reliance thereon or pursuant > thereto, is strictly prohibited. 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