PTFE is the most chemically resistant plastic known. Its mechanical
properties are low compared to other engineered plastics, but it can
be improved by adding fillers such as glass fiber , carbon ,graphite
and similar materials. PTFE has almost ideal dielectric properties.
Its dielectric constant(2.1) and power-loss factor(0.0002) are low
and remain so over a wide range of temperatures and frequencies.
In certain application, such as fuel hoses, some electrical
conductivity is required to dissipate static chargers. When exposed
to flame, PTFE decomposes leaving just a little residue. PTFE is
extremely inert and stable up to a temperature of 260 C. PTFE is
also virtually unaffected by oxygen, ozone and UV light