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December 2001

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Subject:
From:
"<Rudy Sedlak>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sun, 16 Dec 2001 23:16:46 EST
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Adam:  Please see below...

> What are the known etchants useful for boards made with electroplated tin
>  etch resists ? We have been using alkaline sulfate based etchant which
works
>  very well, even with a 1 um bright tin plating thickness.

Uh, Adam, you are probably using the best etchant known for Tin, and getting
away with thinner Tin than anyone using any other etchant.  The only other
etchant suitable for use with Tin is a variant on what you are currently
using, and it is based on ammonium chloride....and most people in the world
use this one, and most people using this etchant need 5-6 um of Tin.

Why do you want to change?

Rudy Sedlak
RD Chemical Company

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