Hey Frank,

Thanks for writing back.

Well, the tarnish is whatever happens when they sit on my desk
uncovered for more than a month or two
no testing,
ALL the unsoldered areas of silver boards ALWAYS tarnish
We don't specify the thickness, maybe we should

The environment is a sealed box (5psi) but they are mounted on
heavy equipment with brutal shack and vibe and temp cycling

So, what are lead-free folks using for switch contacts? gold?

onward thru the fog,
Jack

-=-=-=-

On 9/14/06, [log in to unmask] <[log in to unmask]> wrote:
>
> Hey "New Guy",
> IAg has some great properties. but also some scary side effects.
> 1st question has to be what is the tarnish?
> If Silver Oxide-good, if Silver Sulfide-BAD.
> Have you had it tested?
> Silver Oxide is actually more conductive then silver.
> 2nd question is how thick is your IAg layer, cause if the tarnish is
> red  the
> Cuprous Oxide-bad.
> 3rd question is what environment?
> I'll bet you can guess why.
> Call me during the day and we can discuss further if you want.
> Later,
> FNK
>
> Frank N Kimmey CID+
> 916-670-0645
>
>
>

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------