FR-4 is a fire retardant woven glass epoxy substrate. Getek, a trade name, is a similar product using PPO epoxy in place standard epoxy resin. Polyimide is a replacement resin for the epoxy still using woven glass. Teflon is a trade name for PTFE plastic it is used with a number of fillers to create a substrate. Rodgers is a manufacturer who produces all or most of the above plus a line of thermo set plastic laminates used for pcb manufacture. For more specific answers on the properties of these materials see IPC-4101. Jeffrey A. McGlaughlin, C.I.D. Sr. PCB Designer Battelle Memorial Institute Columbus Ohio [log in to unmask] -----Original Message----- From: KUMAR [mailto:[log in to unmask]] Sent: Monday, February 19, 2001 12:11 PM To: [log in to unmask] Subject: [TN] materials hello, whats the difference between the materials fr4, gtec, rogers, polymide & teflon ? thanx kumar --------------------------------------------------------------------------------- Technet Mail List provided as a free 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------