John:
                Just curious, what is the tin plating going to be used
on? Thin Tin plating produces whiskers, which can be a nightmare.
Thicker Tin plating helps as a whisker mitigating factor. These whiskers
have shot down a nuclear power plant and caused space craft failures.
Tin plating can very problematic. Whiskers can grow in days or take
years.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Thursday, March 16, 2006 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Tin Specification

John:  Generally accepted goal is one micron, or 40 microinches,
thickness.

You essentially never have to worry about it being too thick, and
thickness of less than 75% of that value should raise eyebrows...

Rudy Sedlak
RD Chemical Company

John Parsons <[log in to unmask]> wrote: IPC have graciously
provided us (the industry) with specifications for ENIG
(IPC-4552) and Immersion Silver (IPC-4553), is there a similar
specification Immersion Tin (white tin)?  If not, is there a generally
accepted specification for material thickness?

John Parsons






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