R420a is just R134a with some (~12-20%) R142b(?) to carry the mineral oil in order for them to claim (incorrectly) that it is an R12 "drop-in" replacement.
It's the same essential formulation as Freeze-12.
80-88% R134a should work worse than 100% R134a. Thermodynamics and all, eh?
MattL.
Here's the states. I'm not on it either.
Quote:
What other regulations restrict the use and handling of hydrocarbon refrigerants?
In addition to the prohibition on use described above, and the federal law banning the venting of all refrigerants, there are also state and local statutes and regulations that relate to certain uses of hydrocarbons. As of the printing date of this fact sheet, EPA is aware that the following states prohibit the use of flammable refrigerants in automobile air conditioners: Arkansas, Arizona, Connecticut, Florida, Idaho, Iowa, Indiana, Kansas, Louisiana, Maryland, Nebraska, North Dakota, Oklahoma, Texas, Utah, Virginia, Washington, Wisconsin, and the District of Columbia.
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