Flashpoint I believe is the temp that the liquid will turn to vapor and Ignition temp. is how hot it has to be to ignite..
When using Duracool to replace R12 ... 6 oz is equivilant to 17 oz of R12.. So I may have 1.5 to 2 lbs of it in my car and a fuel tank with 20 gal of gasoline..I fail to see the hazard of using it..
Also R134 is tough on some kinds of hose.. it also produces Hydroflouric acid when moisture is present with it..