Hi Mike, I'd first run a Hull cell panel (to isolate the problem from all other processing steps, i.e. drilling, desmear/e-less and pre-clean). If the nodular deposit forms in the Hull cell, I'd filter a fresh portion of the solution and run another panel in it (to see if particulate matter causes it). If the nodules are still there -- the problem is probably in the additive imbalance -- see if replenishment helps. Eric Yakobson Alpha PC Fab "Michael D. Doty" <[log in to unmask]> on 12/01/99 12:12:14 PM To: [log in to unmask] cc: Subject: [TN] HELP: Plating Nodules Hi again, I've researched the archives but am still looking for some more info on plating nodules. Does anybody out there info on possible causes of nodules. I've already gone through the debris related issues and some surface conditions is there anymore info available? I'm thinking cleaners, copper structure etc.. Thanks in advance. Mike Doty ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################