Steven,

You didn't provide any details, but you might be looking at an older drawing?
There used to be two completely different processes for Immersion Silver,
(and one was definitely thicker than the other)
and at the time, there was no consensus which process was preferred.

If you are looking at a spec that has the older process, check the date and question the source.

Jack

On Mon, 10 Aug 2015 15:46:47 -0400, Steven Kelly <[log in to unmask]> wrote:

>Hi All,
>Why would someone choose thick immersion silver over thin? Are these different chemistries? Regards Steve Kelly
>