Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Hollmike-at-aol-dot-com> Janet, You can find much of that information here: http://www.matweb-dot-com/searchindex.htm Just look in the thermoplastics section. This is a pretty extensive database for just about everything actually. PTFE has a dielectric constant of appros. 2.1 and dielectric strength of about 70kV/mm. Mike