Joe, What type of Permanganate are you using. Potassium or sodium. This may make a big difference. Once works well on higher Tg materials while the other should basically be used for standard 130 Tg FR4. I believe the sodium is better for the high Tg materials. Ed Cosper -----Original Message----- From: Joe Aronson <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Wednesday, July 21, 1999 5:34 PM Subject: Re: [TN] Permanganate Problems Tony, I know someone who regularly works with permanganate and polyclad. Ted Myers at JMSPI. Hope this helps. Joe Aronson Process Eng JMSPI >>> Tony Charais <[log in to unmask]> 07/21/99 08:09AM >>> We are seeing an occasional problem with our current permanganate process. We have a DOE running but we are having problems developing topography in the hole on a given product. This is a high aspect ratio multilayer board. We are confident that the problem isn't related to fluid transfer in the hole. This product is based on a PolyClad core. Has anyone else had problems with PolyClad material? We are wondering if it could be something to do with their resin. Any support from the technet would be appreciated. Tony Charais Manufacturing Engineer [log in to unmask] ############################################################## 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 ############################################################## ############################################################## 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 ##############################################################