[AMPS] Alert-- ptfe does NOT give phosgene

[measures]

>
>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.
>
thanks for the info,  Dave

-  Rich..., 805.386.3734, www.vcnet.com/measures.  


--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm