US DOT Hazardous Materials Regulations (49 CFR Parts 171 to 180) 172.400-406: Labeling: primary and subsidiary hazard labels, placement near the shipping name, size, durability and the 172.400a exceptions (172.400 to 172.407)

Whoever offers a hazardous material in a non-bulk package, bulk package under 640 cubic feet, portable tank under 1,000 gallons, DOT specification cylinder or overpack must apply the primary hazard label that column 6 of the Table calls for and any subsidiary hazard labels, placed on the same surface near the proper shipping name marking, on a background of contrasting colour or with a dotted or solid line border, with the specified size, colour and durability of 172.407, and with the exceptions of 172.400a (for example limited quantities, certain Class 7 and ORM-D) and the mixed and consolidated package rules of 172.404. The individual label designs are in 172.411 to 172.450 (Explosive, Flammable gas, Non-flammable gas, Poison gas, Flammable liquid, Flammable solid, Spontaneously combustible, Dangerous when wet, Oxidizer, Organic peroxide, Poison inhalation hazard, Poison, Infectious substance, Radioactive White-I, Yellow-II and Yellow-III, Corrosive, Class 9, Cargo aircraft only, Lithium battery, Empty).