Steve,

In using the OMIKRON in particular, have there been any oxidation issues for
boards left in stock that would determine a life span caveat for this process.

To date we have not seen any oxidation that gives us a problem. We are currently
running 160- 180 pcs a day and are about at the point of using each days
shipment of boards the next day.


Is staining an issues for you based on the quality of the final rinse or does it
matter in your process window.

What I have seen sitting on the warehouse shelves is nice and bright white tin
with no staining. We do keep this board wrapped until it is used (a process I
wish we could extend to some of our other boards) so I'm sure that aids in the
final preformance.


How has your incidence of de-wetting due to surface contaminants been wit WIT?

We have to date seen no dewetting on this board  or at least it has not been
reported as a defect in final inspection.





----- Original Message -----
From: Steve Collins <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 28, 2000 12:58 PM
Subject: [TN] Immersion Tin


> We are using White Tine on one of our boards and it is working out just
fine for
> us it's a 4 layer MC-5 (GIL) construction. The reason for us using this
finish
> is that we did not want to subject the PCB to the extreme temperature of
the
> HASL environment. Some of the benefits are a flatter PCB at incoming
inspection
> flatter pads due to the unevenness of the HASL finish. We did go through
some
> growing pains since we were told it was a drop in finish for HASL and
found out
> that we needed to tweak considerably the profiles and the fluxes. To date
we
> have seen no drawbacks and we have around 11000 boards in the field. We
ran
> DOE's on both the Omikron & Dexcoat versions with no differences found in
our
> assemblies.
>
> Hope this helps.
>
> Steve
> ---------------------- Forwarded by Steve Collins/Antec on 02/28/2000
10:35 AM
> ---------------------------
>
>
> Russell S Gregory <[log in to unmask]> on 02/25/2000 12:12:24 PM
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
respond to
>       [log in to unmask]
>
> To:   [log in to unmask]
> cc:    (bcc: Steve Collins/Antec)
> Subject:  [TN] Immersion Tin
>
>
>
> Dear All,
>
> I am interested in the benefits of Immersion Tin as a final finish.
> Do any of u use Immersion Tin as a final finish?
> Why do u use it and what did u change from?
>
> What are the benefits for you of an Immersion Tin?
>
> What are the drawbacks?
>
> Does an  Immersion Tin have to pass a specific test for approval?
> Do all Immersion Tins give u the same benefits?
>
> Russ Gregory
>
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