Sounds like you're on to something. It's very doubtful (wanted to say no way - but never say never) an effective pumice scrub will leave a "new penny" shine on a copper surface. To be effective the pumice has to change the surface topography of the copper by removing oxides, etc. Don Vischulis -----Original Message----- From: Steve Gregory <[log in to unmask]> Sent: Jan 15, 2004 10:55 AM To: [log in to unmask] Subject: [TN] "Snake Board"...an epilog. Hi All! Well, I took a board that was from the same fabrication panel, ran it across the wave, and washed it...then again observed the mask sloughing off like a snakes skin. According to our fab vendor, the pumice scrub prior to soldermasking was signed-off as completed on the production paperwork, but the process engineers there acknowledged that it didn't look like it had been done from the pictures I sent them (the same ones on my web page). I'm sending them the bare fab that I had ran through the wave and wash today. Thanks for all the inputs! You guys are right on the money almost every single time! -Steve Gregory- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------