Hi Genny, Pratap, CA-JoeFj, IPC LF Listservers, <== Your question that interests me We have a survey to fill out regarding one of our products. One part states: Semiconductor component package based on PTFE substrate is not allowed <=== Pratap and Joe already gave you good information. Why would they ask you this question? This would be my first question back at them. Why are they expecting PTFE inside of a semiconductor package as the base subtrate. Do you build hybrid specialty circuits? Yours in Engineering, Dave YiEngr, MA/NY DDave -------------------------------------------------------------------------------Leadfee Mail List provided as a 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 Leadfree To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL) Search previous postings 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 847-615-7100 ext.2815 -------------------------------------------------------------------------------