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49 CFR Parts 100-180

The full Hazardous Materials Regulations (HMR) — PHMSA's complete rulebook for shipping hazmat.

The Full Hazardous Materials Regulations

49 CFR Parts 100-180 is the shorthand for the complete Hazardous Materials Regulations (HMR) — PHMSA's rules covering classification, packaging, marking, labeling, placarding, shipping papers, training, and incident reporting for anything classified as a hazardous material in transportation. Every other topic in this HazMat section links to a specific piece of this range.

Where to Start

If you're new to the HMR, FMCSA's plain-language overview below is a better starting point than jumping straight into the regulatory text — it explains the pieces (classification, communication, training, emergency response) before you go looking for the specific part number you need.

Free Resources

49 CFR Chapter I — Pipeline and Hazardous Materials Safety Administration eCFR
The complete, current Hazardous Materials Regulations — browse to any specific part from here.
How to Comply with Federal Hazardous Materials Regulations FMCSA
A plain-language starting overview before diving into the full regulatory text.