Hi .. your questions:

reflow concerns: none
wavesolder: no problem .. no masking needed. (but watch for any exposed
copper in the switch area)

inline with earlier posts, you want to specify a 30 Ohm per square ink which
does not need silver.
Source for the ink is another matter, lots of gray areas there.

what you want to pay attention to is the design of the switch itself. you
may not necessarily want to simply carry over the existing gold pattern to
the carbonink version.

besides that, there are zillions of carbonink switches out there working
very reliably.

cheers / Wolfgang



----- Original Message -----
From: "Scott Lefebvre" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 20, 2005 2:37 PM
Subject: [TN] Carbon Keypad


> Currently we use gold for all of our keypads.  I want to reduce the cost
> of a product and thought about switching to a carbon keypad.  I am not
> familiar with the process and wanted to know a few things.  We mostly use
> a water-soluble process and our entire product is washed.  Some boards are
> a mixed technology using SnPb currently.
>
> ?  Are there any Reflow solder concerns I should be aware of?
> ?  Are there any Wave solder concerns I should be aware of, like masking
> pads during wave solder?
> ?  Are there any other concerns period that I should be addressing.
>
> Thank you,
>
> Scott
>
>
>
>
>
>
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