Avgas 100LL is one of four grades of avgas and is used primarily as fuel for piston-powered craft because it has a low flash point so as to improve its ignition characteristics. Avgas 100LL is a high octane gasoline which allows a powerful piston engine to burn its fuel efficiently, a quality called "anti-knock" because the engine does not misfire, or "knock." The suffix LL (which stands for “Low Lead”) describes a grade containing lower tetraethyl lead than a second grade of identical lean and rich mixture ratings. Avgas 100LL is a liquid, is blue in appearance (color) and has a specific gravity of 0.68-0.74 @ 60ºF (15.6ºC). Sergeant only sells Avgas 100LL that meets or exceeds the ASTM D910-02 standards globally. Sergeant is a direct distributor of Avgas 100LL from Phillips 66 Company and therefore buyers avoid layers of middlemen.