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Re: Sulfur Hexafluoride, freon phosgene, etc.
From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
Sent: Sunday, November 23, 1997 1:35 PM
To: Tesla List
Subject: Re: Sulfur Hexafluoride, freon phosgene, etc.
> ****NOTE: If I recall correctly, burning Freon results in DEADLY
> phosgene
> gas.......not advisable as an insulator etc....
> RV
Chlorinated hydrocarbons in contact with hot metal can create phosgene
(notoriously the Carbon Tetrachloride fire extinguisher problem).
Decomposing them generates hydrogen chloride, hydrogen fluoride, and a host
of equally obnoxious compounds. However this is also true of most plastics,
many of which are chlorinated hydrocarbons (PVC = Poly vinyl CHLORIDE,
e.g.).
Just know what you are using, and don't exceed the design limits. If you
are using SF6 as an insulator, don't design to the ragged edge of
breakdown.
To return the original question of SF6 in a spark gap, I don't think it
would be appropriate. Air is probably best. Pure Nitrogen seems to lead to
rapid electrode erosion.