Except for compressed gases and radioactive materials, each hazardous material is assigned a packing group; certain materials may be assigned more than one packing group. Part 173, Subpart D of the HMR is used to determine the relevant packing group. Click on the HMR links to learn how to determine the packing group for each class.
- Class 3: Flammable and Combustible Liquid § 173.121
- Class 4: Flammable Solid, Spontaneously Combustible Material, and Dangerous When Wet Material § 173.125
- Class 5: Oxidizer and Organic Peroxide § 173.127 § 173.129
- Division 6.1: Poisonous/Toxic Materials § 173.133
- Class 8: Corrosive Material § 173.137
- Class 9: Miscellaneous Hazardous Material § 173.141