John. The site you mentioned states their product is a hydrocarbon (HC) type refrigerant. The main component of HC types is some sort of isobutane.
A couple of months ago I have done some serious reading and found the HC types have been very popular in early days of cooling and nowadays are widely being used again in refrigerators. They are not yet used in cars, mainly because of the high risks that arise when the system would leak, especially inside the interior of the car!
The characteristics show that a HC cools great, mixes great with the oil in the system, is rather cheap, is very, very ozone friendly and you will need a lesser charge (all in respect to R12).
Some drop ins - R413A for instance - use a bit of butane to help transport the oil in the system. (R134 does not transport the oil very well either). I have read some people use LPG in their A/C system.
Apart from the risk of explosion, it seems the HC are far better than R134 or even R12. Some people say that the overall investment in R134 is so huge, the HC's will just have to wait.
From what I know now, I would be very hesitant using a HC type refrigerant in my car.
Rob
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www.si.hhs.nl/~rob
