Flammable and Combustible Liquid Hazard Classifications

Hazard classifications

National Fire Protection Association (NFPA) hazard classifications for flammable and combustible liquids are listed below:

Hazard classification for flammable liquids      
Class Flash point Boiling point Examples
I-A below 73°F (23°C) below 100°F (38°C) diethyl ether, pentane, ligroin, petroleum ether
I-B below 73°F (23°C) at or above 100°F (38°C) acetone, benzene, cyclohexane, ethanol
I-C 73-100°F (24-38°C) ---- p-xylene
Hazard classification for combustible liquids      
II 101-140°F (39-60°C) ---- diesel fuel, motor oil, kerosene, cleaning solvents
III-A 141-199°F (61-93°C) ---- paints (oil base), linseed oil, mineral oil
III-B 200°F (93°C) or above ---- paints (oil base), neatsfoot oil



Stanley Howell
Sr. Program Manager
Chemical Safety

Steve Elwood
Associate Director for Laboratory Safety