What a load of horse crap!
4000 ppm of just about anything will kill something for sure, except
maybe oxygen or nitrogen!
Another scare tactic to sell a different product.
That's all I'm going to say as I personally don't make many comments
without proof as this fool did.
What about laws that prohibit human tests of this type, I guess that they
just ignored them huh?
ghg at worldserver.com wrote:
>> LETHAL R-134a CONCENTRATIONS IN PASSENGER COMPARTMENTS MAY OCCUR
> FROM EVAPORATOR FAILURE
>> In August 1997, a study was done at the Armstrong laboratory, Wright
> Patterson Air Force Base, Dayton, OH. The report, "Human Inhalation of
> Halon 1301, HFC-134a and HFC-227ea for Collection of Pharmacokinetic
> Data" was authored by A. Vinegar, R. Cook, J McCafferty, M. Caracci, and
> G. Jepson.
>> The concentration of R-134a being used was extremely low and (then
> thought) that nothing bad was going to happen. To quote from the bottom
> of page 10 (page 11 if abstract prepended), "Subject #3 was the first
> volunteer exposed to
>> HFC-134a. The exposure concentration was 4000 ppm (0.4% v/v) and was
> scheduled to last for 30 minutes with a 5 minute postexposure evaluation
> period as was accomplished in the Halon 1301 portion of the study.
> Approximately 4.5 minutes into the exposure, the subject lost
> consciousness and both pulse and blood pressure dropped to zero."
>> The test was aborted and medical personnel intervened and revived the
> subject.
> Suppose it wasnt a test in a medical lab, that person would be "dead".
>> The industry, has in general, tried to "coverup" this "problem", often
> reporting "Human Subject Faints During Botched Air Force R-134a
> Inhalation test". They then go on to theorize that the nurse wiggled the
> blood drawing needle and that made the subject "faint". See (on the web)
> www.autofrost.com/humanhal2.pdf to download your own copy or call Monroe
> Air Tech at 1-800-424-3836 for a copy. Be your own judge. Using "0.4%"
> (4000 ppm) parts per million of R-134a vapor in air as the "lethal"
> amount, the following calculations were performed on several late model
> cars. They assume a bad evaporator leak or rupture, allowing the factory
> listed charge amount
>> to escape into the passenger compartment. R-134a is heavier than air, so
> if the air is not "stirred" by a fan, heavier concentrations will be
> found in low spots and lower in high spots. For these purposes, we will
> assume the air is stirred and the concentration is uniform.
>> The specific Volume of R-134a vapor at "normal" pressure (from the NIST
> Standard Reference Database 23 "NIST THERMODYNAMIC PROPERTIES OF
> REFRIGERANTS AND REFRIGERANT MIXTURES") is 3.69 cubic feet per pound
> (cf/lb). If you blow off a 1 lb can of R-134a into am empty garbage bag
> (sealed), it will occupy 3.69 cubic feet.
>> SPECVOL134a CF R-134a CHG lb 1 1,000,000 parts
> conc. (ppm) = ----------- X ------------- X -------- X
> ----------------
> lb Int.Vol CF per million
>> 1998 CAR Interior(CF) lb R134a pass.conc ppm Times
> lethal
> Ford Escort 87 1.75 74,224 18.6
> GEO Prism 84 1.7 74,679 18.7
> Chevy Cavalier 92 1.5 60,163 15.0
> Ford Taurus 101 2.13 77,819 19.5
> Ford F150* 80 2.38 109,778 27.4
> Toyota Camry 96.8 1.88 71,665 17.9
> Ford Mustang 83 2.13 94,695 23.7
> Chevy Malibu 98.6 1.75 65,492 16.4
> Honda Accord 90.4 1.43 58,371 14.6
> Chevy S-10* 80 2 92,250 23.1
> Chevy MonteCarlo 96.1 2 76,795 19.2
> Olds Cutlass Supreme 95 1.75 67,974 17.0
> Buick Skylark 87 2.25 95,431 23.9
> BMW 5 Series 93.5 3.27 129,051 32.3
> * Estimated, since interior volume was not available
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