oh, I probably wasted your time.

I was talking about little pushbutton dome switches like
for a remote control. In the past it was a requirement to
use hard gold electroplating, which meant I had to design
in plating bars, but it would be convenient for me if the
Immersion silver could do the same job.

thanks for the info, though, I appreciate it

Jack





"Rob Legg" <[log in to unmask]>
17Apr2002 01:54 PM


To:   "TechNet E-Mail Forum." <[log in to unmask]>
      "Jack C. Olson" <[log in to unmask]>
cc:

Subject:  Re:      Re: [TN] Immersion Silver
Retain Until: 05/17/2002 Retention Category: G90 - Information and Reports
Caterpillar Confidential:  Green


Silver finds it's way into high energy switchgear contacts (not solder
terminations) due to it's ability to maintain a functional contact surface
in the presence of arcing. Normal contamination of surfaces is defeated
through the wiping action forced on these contacts, when in transition.
Arcing and static surfaces of the contact are partitioned, where possible.
High rel components (mtbf still sucks) are hermetically sealed.

The mfring process is generally hostile to all switchgear; uncovered or
unsealed parts require special handling to reduce fallout.

Silver has no greater suitability for forming reliable solder joints, on or
in switchgear, than it has anywhere else.

A month is a very short time to guarantee solderability. Have you looked at
the date-codes on some of your electromechanical parts?

RL
[log in to unmask]

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