[[[deleting overly wordy text not relevant to my comment below-grin]]] I
would not recommend anyone jump up and run out the door to their board house
screaming "Hold the press, I want IAg", as the selection of the finish must
be fully considered and fully qualified.

=========
I agree with the above comment, exactly.

Franklin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Tuesday, September 26, 2006 2:45 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Finish

IAg-ISn: 1-1 (half)
interesting game.
I'm on neither side, because we don't use much of either....
The IAg seems to be more aggressive and one ought to put money on them.
On the other side, ISn seems to have better coaching and more experienced
players.
I'll stay up for another hour this night to see the next half.
Inge


----- Original Message -----
From: "Franklin D Asbell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 26, 2006 1:03 AM
Subject: Re: [TN] PCB Finish


>6 of one, 1/2 dozen of the other.
>
> You should consider many factors in regards to which is preferable,
> for example, shelf-life, handling, packaging, number of thermal cycles

> the product will see, surface features, size/pitch, etc.
>
> In my opinion, handling durability is better with immersion tin; shelf

> life is better with immersion tin, and solderability are equal when
> measuring the same feature types.
>
> This is comparing the Omikron with the Macdermid Sterling Silver, and,

> most important, both baths operating optimal.
>
> The Omikron bath is more difficult to maintain than the MacDermid SS
> but if I had to choose one over the other it would still be the
> Omikron. The thickness of the Omikron needs to be on the high side (30

> - 40 micro") in order to pass multiple thermal cycles, I've not seen
> silver pass as many with similar results as tin.
>
> Again, there are many factors you should consider, keep asking
> questions, talk to suppliers, customers, run DOE's, get your hands
> dirty and you will find what suits you best, this is just my opinion.
>
> Franklin
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of kwood716
> Sent: Monday, September 25, 2006 4:25 PM
> To: [log in to unmask]
> Subject: [TN] PCB Finish
>
> Hey all,
> Question...
> Is immersion silver a more reliable and all around better finish than
> white tin? I am looking into using it instead of the Omikron OA-8 we
> currently use and would like some input.
> Note: I can't use and nickel in the PCB, these boards are for MRI use
> and have to be completely non-magnetic.
> Thank you
> Ken
>
>  _____
>
>
> Saturn PCB Design, Inc.
> Kenneth J. Wood CID
> 2737 Bishop Lane
> Deltona, Fl 32725
> Phone: 407-340-2668
> email:  <mailto:[log in to unmask]> [log in to unmask]
> www.saturnpcb.com <http://www.saturnpcb.com/>
>
>
>
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