Divisions 1.1–1.6
Explosives
Materials and articles with an explosive hazard, classified by mass-explosion, projection, fire and related effects.
Safety and compliance reference
Understand the nine current U.S. DOT hazard classes.
Review a high-level overview of the nine U.S. DOT hazardous-material classes and follow the direct links to PHMSA sources for current requirements.
Do not use this page to classify or prepare a shipment.
Proper classification, naming, packaging, marking, labeling, documentation, training and modal requirements depend on the exact material and movement. Consult the current regulations and qualified dangerous-goods personnel.
2.1 flammable · 2.2 non-flammable/non-toxic · 2.3 toxic
Gases
Compressed, liquefied, dissolved or refrigerated gases classified by flammability and toxicity.
Class 3
Flammable Liquids
Liquids meeting the regulatory flash-point criteria, including many fuels, solvents and coatings.
4.1 · 4.2 · 4.3
Flammable Solids
Flammable solids, spontaneously combustible materials and substances that emit flammable gas when wet.
5.1 · 5.2
Oxidizers & Organic Peroxides
Materials that can intensify combustion and thermally unstable organic peroxide formulations.
6.1 · 6.2
Toxic & Infectious Substances
Poisons and substances known or reasonably expected to contain pathogens.
Class 7
Radioactive Materials
Materials containing radionuclides above regulatory activity and concentration thresholds.
Class 8
Corrosive Materials
Liquids or solids capable of destroying skin tissue or severely corroding certain metals.
Class 9
Miscellaneous Hazardous Materials
Regulated hazards not covered by Classes 1–8, including certain batteries, environmentally hazardous materials and elevated-temperature materials.