Novacool UEF (Universal Extinguishing Foam) extinguishes 5 Classes of Fire, A,B,D,K and 3D fires at a maximum mix rate of 0.5% (1/2%), is biodegradable and outperforms AFFF / AR-AFFF and the new fluorine-free foams coming to market. Also outperforms Class A foams with superior penetration and absorbtion of heat. Novacool has an indefinite shelf-life and will not separate. Indefinite shelf life means not having to replace your foam concentrate until used - a HUGE plus. Multi-class fire protection means you are prepared for whatever comes your way.