AC with Propane- Staying Alive - Page 6 - PeachParts Mercedes-Benz Forum

EricSilver · #1 08-15-2009, 05:21 PM

Glad I saw this thread after recharging with R134, otherwise I'd probably be hunting for the Duracool.

roedel · #2 08-16-2009, 06:36 PM

Quote:

Originally Posted by Matt L

That's an old but good myth. But is it true? I've only see it referenced where people are trying to sell me HC's that cost three times as much.

here some interesting health facts regarding R134a, see also attached document. I had to upload the document as a text file.
the .pdf version is to big.

Quote:

> 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.

#3 08-14-2009, 11:26 AM

So, I guess this means that if you snort R134a you can get bigger balls. Maybe some of the politicians should try it. Oh... I forgot, not all of those slimy folks have them to start with.

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