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June 2002

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Subject:
From:
"Tempea, Ioan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 19 Jun 2002 12:06:53 -0400
Content-Type:
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text/plain (139 lines)
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
> >
> >
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