I believe it is called Halotron, I had one in my Miata. The guy at the extinguisher store recommended it since it wouldn't throw powder everywhere and destroy an engine compartment. He never mentioned the lethality of it though. Are you saying a breath of the stuff would kill you or does it have to be inhaled continually?......There's a replacement one that has haylon-something in the name. Its also really deadly - much more so than CO2 (which will kill you if you get shot in the face).....