Some vendors offer a coagulent in which you move the bath
to a different container, add the coagulent, allow to settle, then pump the
clear liquid on top back to the bath.  However, I don't know of anyone
who is doing this.

I have had limited success using a true 1 micron filter.  Not sure how
much I gained in extending the life of the bath though.

gary mccauley
PC Boards, Inc.

-----Original Message-----
From: <Rudy Sedlak> [mailto:[log in to unmask]]
Sent: Monday, August 27, 2001 4:27 PM
To: [log in to unmask]
Subject: Re: [TN] Tin Plating bath (not clear anymore)



Filtration of Stannic is EXTREMELY difficult due to the extreme fine
particle
size (the brightener/leveler in the Tin plating is a surfactant that causes
extreme small particles to form).

Rudy Sedlak
RD Chemical

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