Phil: The only place I've heard of PTFE, PTA and like materials still being metallized is for the space program. I seem to remember that a year or two ago in NASA Tech Briefs there was an article which alluded to gold as the metallization in the PTFE. Hope this helps... Dr. Bill > -----Original Message----- > From: Phil Hersey [SMTP:[log in to unmask]] > Sent: Thursday, May 28, 1998 1:16 PM > To: [log in to unmask] > Subject: [TN] Metallized teflon film > > I understand that prior to polyimide, vacuum metallized Teflon film was used for flex PCB's.> Seems to me this would be an excellent RF board material in place of PTFE panel material (at 2 mil thickness a 50ohm trace would be 6 mil wide). Has it disappeared totally and if so, why? > > > Phil Hersey > [log in to unmask] <mailto:[log in to unmask]> > (702) 884-5388x128 ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################