Rudy,
Production person here. I ran the then Dexter FST for about two years and
thicknesses of 30 microinches were steadily maintained. When a "decant" of
the bath was performed we had alot of readings in the 40 range for a couple
of weeks but then would taper back off into the 30's. I also evaluated the
then McGean Rohco immersion tin also which seem to perform much like the
Dexter.

Tony Steinke
AIT-Atlanta Inc.
----- Original Message -----
From: "Rudy Sedlak" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 15, 2002 3:56 PM
Subject: [TN] Immersion Tin Thickness


> There are some numbers being thrown around for immersion Tin Thickness
that
> are a little unrealistic.
>
> Getting 40+ microinches (1+ micron) is pretty difficult, to impossible on
a
> production basis.  It can be done in a lab, with a freshly made up bath,
but
> I have never seen even 50 microinches ever, and this is with any immersion
> Tin process.
>
> Is anyone even maintaining 40 microinches in production?
>
> I suspect that you have to run your process pretty carefully to maintain
30+
> as the bath gets old.
>
> Will production people comment please?
>
> Rudy Sedlak
> RD Chemical Company
>
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