[redfox]

Yes, duracool does use propane as one of the components. People have been told to be afraid of it as a refrigerant because propane is flammable. the average automotive system has only about 12 oz in the system. How many people have a 20 lb tank of pure propane mounted under their gas grill and they are not afraid of that ? It amazes me how gulible we have become as a people to believe everthing we are told by the chemical companies. The truth is that all refrigerants are flammable once they are mixed with oil in the a/c system. If you have looked along the side of the interstates and seen a car completely destroyed by fire you will know how flammable 134a is. At first they told us 134a was not flammable, but they have always admitted it was combustible. Combustible means that it does not have to have an ignition source.Heat and pressure will ignite 134a. They say it will ignite at 351 degrees at 5.5 psi. I believe it is lower than that.