Rudy,
You mention that Immersion tin works best when used often, are you
referring to working the bath or simply circulation/filtration of the
chemistry.  Additionally, have you had any experience with impacting the
"life span" of the immersion tin chemistry if it is kept at operating
temperatures for extended periods of time? Operating temperatures being
approximately 120F to 160F?
Lisa Angle
Alternative Surface Finish Process Engineer





"<Rudy Sedlak>" <[log in to unmask]>@IPC.ORG> on 11/07/2000 08:48:47 AM

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Subject:  Re: [TN] Board Whit Tin finish


Another factor that may be obvious, (to the fabricators) but deserves
comment.

Immersion Tin is a bath that works best if used often, and is not allowed
to
sit idle for long periods....whereas OSP can tolerate long periods of
non-use
more easily.

Rudy Sedlak
RD Chemical Company

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