There are a few new coating out there, Dexter and Omnikron to name the two
that I am familiar with and they bear no resemblance to the old type dip
and coat processes from the past. Both exhibit excellent properties and are
touting a year shelf life. See PCFAB (Dec. 98) for Omnikron.

-----Original Message-----
From:   [log in to unmask] [SMTP:[log in to unmask]]
Sent:   Tuesday, January 05, 1999 2:39 PM
To:     [log in to unmask]
Subject:        [TN] immersion white tin finish

Seth,

You're hot! What are you doing? I mean, you're doing the most advanced
stuff (coming around again)
existing. It's like you're putting together a wish list. You will get some
interesting replies to
your question and one I have asked before.

Recently, I have received some "white" boards. My expectations did not
concern "whiskering" but
oxidation. With immersion (very thin) coatings, usually there is no problem
with metallic growth or
stray structures. Tin simply strikes fear because of what it is and how
readily/rapidly it
oxidises. I only, still, question shelf life and solderability.

Please advise us all concerning your other findings,

Earl Moon

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