Substances of Class 2 are assigned to 3 divisions based on the primary
hazard of the gas during transport.
Division 2.1: Flammable Gas
Hazard Label:
IMP Code: RFG
Division 2.2: Non-flammable, Non-toxic Gas
Hazard Label:
IMP Code: RNG or RCL, as applicable
Some non-flammable gas are cryogenic liquids (deeply refrigerated gases) as
well. These commodities bear the same label but are registered with the IMP
Code: RCL
Division 2.3: Toxic Gas
Hazard Label:
IMP Code: RPG
Note: Toxic Substances labels inscribed with the text “Toxic Gas” or “Poison
Gas” are acceptable.
