FYI.... There are immersion Tin chemistries that have no MSA (Methane Sulfonic Acid) and operate at much more benign pH levels...like 2.0 +/- instead of the MSA pH close to Zero. And these other chemistries tolerate dissolved Copper better. Contact me directly for infomation on how to find these chemistries. Rudy Sedlak RD Chemical Company ([log in to unmask]) --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------