Rudy,
     This is the response I sent to Les.

Les,
     What kind of tin immersion bath are you questioning?  I work with the
Omikron White Immersion Tin.  In the case of Omikron you would keep the copper
concentration under 4,000 ppm.  In most cases under normal use the
concentration will stay below 1,000.
     If you cool the bath and filter it with a one micron filter you will find
the bath stays within limits fairly easy.

Stephen M. Wentz
Florida CirTech

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################