NOTE: Label safety cans with contents and hazard warning information. Safety cans containing flammable or combustible liquid waste must have appropriate waste labels. Place 20-L (5-gallon) and smaller containers of flammable liquids that are not in safety cans into storage cabinets for flammable liquids. Do not vent these cabinets unless they also contain volatile toxics or odoriferous chemicals. Aerosol cans that contain 21% (by volume), or greater, alcohol or petroleum base liquids are considered Class IA flammables. When space allows, store combustible liquids in storage cabinets for flammable liquids. Otherwise, store combustible liquids in their original (or other Department of Transportation-approved) containers according to Table 4.2. Store 55-gallon drums of flammable and combustible liquids in special storage rooms for flammable liquids. Keep flammable and combustible liquids away from strong oxidizing agents, such as nitric or chromic acid, permanganates, chlorates, perchlorates, and peroxides. Keep flammable and combustible liquids away from an ignition source. Remember that most flammable vapors are heavier than air and can travel to ignition sources.
a Class IA includes those flammable liquids having flashpoints below 73 °F and having a boiling point below 100 °F, Class IB includes those having flashpoints below 73 °F and having a boiling point at or above 100 °F, and Class IC includes those having flashpoints at or above 73 °F and below 100 °F.
b Class II includes those combustible liquids having flashpoints at or above 100 °F and below 140 °F, Class IIIA includes those having flashpoints at or above 140 °F and below 200 °F, and Class IIIB includes those having flashpoints at or above 200 °F.
c Glass containers as large as 1 gallon can be used if needed and if the required purity would be adversely affected by storage in a metal or approved plastic container, or if the liquid would cause excessive corrosion or degradation of a metal or approved plastic container.
SOURCE: NFPA (1991c), Chapter 7-2.3, "Storage."