It was banned for being a Class 1 ODC - ozone
depleting chemical. R-12's ODP (ozone depleting
potential) is 1.0 . R-134a's is, you guessed it,
0.0. Class 2 ODC's like R-22 have ODP's of around
.02. BUT the GWP (Global warming potential ) is
different, and currently refrigerants aren't banned
for high GWP, but that is the next regulation on the
horizon. As far as the chemistry goes, it is a free
chlorine molecule that breaks off the fluorocarbon
under the presence of ultraviolet light. The chlorine
doesn't like being monatomic, and does an oxygen
attracting mating dance, ultimately getting an oxygen
molecule from the O3 ozone. This Has NEVER been
duplicated in a laboratory. The Japanese claimed
they did, but it was bad data.
Ron
--- Andy Webster <trunkie@hotmail.com> wrote:
> I thought the problem with refrigerant was not so
> much a greenhouse one but
> an ozone one.
> I remember hearing in an environmental chemistry
> lecture that one molecule
> of CFC such as R12 destroys around 10,000 ozone
> molecules in its long
> lifetime in the upper atmosphere.Can't remember
> whether it was a free
> radical reaction or what...
> Andy
>
>
> >From: Ron Soave <soavero@yahoo.com>
> >To: RBHouston@aol.com, toyman@htcomp.net
> >CC: trunkie@hotmail.com, spritenut@Exit109.com,
> spridgets@autox.team.net
> >Subject: Re: Cool LBC
> >Date: Fri, 20 Aug 1999 19:53:46 -0700 (PDT)
> >
> >
> > > An HVAC guy also told me the new stuff now is
> > > suspect.
> >
> >Yeah, now they're screaming that R-134a is a
> >greenhouse gas, even though its GWP (Global Warming
> >Potential) was originally said to be an order of
> >magnitude lower than anything ever made.
> >
> >Regarding DuPonts motivation, it was no doubt
> >financial, but R-12 was being produced cheaply by
> >AlliedSignal as Genetron 12 and someone else (Dow?)
> as
> >Dynamatron 12. Don't know about the patent thing.
> >Might be true.
> >
> >
> >__________________________________________________
> >Do You Yahoo!?
> >Bid and sell for free at http://auctions.yahoo.com
> >
>
>
>
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