Teflon is a (fluorocarbon resin) or (flourine plastic) and has the same
structure as polyethylene, in which the hydrogen is replaced by (flourine).
OR a part may be replaced by (chlorine), in which case it is called a
(fluorohalocarbon resin).
Polymerized (tetrafluoro ethylene), aka PTFE, which carries the E.I. du Pont
trade name of Teflon, formula (CF2*CF2)n is probably the most common
solid form used for insulating materials, bearings, gaskets, insulating
tapes, wire insulation, etc. This is a white waxy solid with specific
gravity of up to 2.3, typical tensil strengths of up to 3500 psi, elongation
of 250-350%, dielectric strength of 1000 v/mil and melting point of 594*F.
Another commonly encountered material in electronic use and sometimes
referred to generally as "Teflon", is Teflon FEP, which is a fluorinated
(ethylene-propylene). In thin films (typically down to 0.0005"), it is most
frequently found as insulation in capacitors. Typical tensil strength is
3000 psi, elongation 250%, and dielectric strength 3200 V/mil.
Neither PTFE or Teflon FEP emit phosgene upon decompositon at elevated
temps.
However, fluorothene plastic (which may be what Rich's info was referenced
to) has the formula (CF2*CFCL)n and differ from (Teflon) in having one
chlorine atom on every unit of the polymer chain, replacing the 4th
fluorine atom. This is a (transparent) material with a specific gravity of
~2.1, has tensil strengths of up to 9400 psi, but has a lower withstanding
temp (as related to Teflon) of around 300*F. This material is sometimes
called "Teflon" due to its similarity in chemical and polymer-structure
make-up, and will emit phosgene upon decomposition at elevated temps.
73, Dave, K1FK
Fort Kent, ME
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