My AC is leaking r134a into the passenger compartment of my '95 Ford
Ranger. I have not had it fixed yet, so I replace it once or twice
during the summer months when I use the AC. When I initially replace
the refrigerant, I can smell it being leaked. Presumably, it continues
to leak even after it is no longer noticeable after the pressure
drops. So my simple concern is this: Is r134a carcinogenic?

Chemical manufacturers are required to prepare documents known as an
MSDS -- Material Safety Data Sheet -- for their chemicals they sell.

The MSDS for R134a can be seen here:


http://www.pioneerair.com/sitemap.htm



by clicking on the text, "MSDS - R134a"



The MSDS indicates that small exposures to R134a are note expected to
pose a toxic hazard.

In particular, the cancer-causing effects of R134a are characterized this way:


==========
DuPont

Material Safety Data Sheet

Carcinogenicity Information
None of the components present in this material at concentrations
equal to or greater than 0.1% are listed by IARC, NTP, OSHA or ACGIH
as a carcinogen.
==========



In other words, none of the major national (US) or international
agencies with oversight for cancer-causing chemicals has classified
R134a as a carcinogen.


Hope this is what you were after.   But if you need any additional
information, just let me know by posting a Request for Clarification.


pafalafa-ga



search strategy -- Google search on [ r134a msds ]

Thank  you for your very useful and succinct answer; this is exactly
what I was after.

Hi There.

Maybe this article can help you out with your question:
http://yarchive.net/ac/r134a_lethal.html

thanks borisshah!