Site Feedback

Title 49

Displaying title 49, up to date as of 8/13/2026. Title 49 was last amended 8/07/2026.
There have been changes in the last two weeks to Subpart G.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 49TransportationPart / Section
Subtitle BOther Regulations Relating to Transportation100 – 1699
Chapter IPipeline and Hazardous Materials Safety Administration, Department of Transportation100 – 199
Subchapter CHazardous Materials Regulations171 – 185
Part 173Shippers—General Requirements for Shipments and Packagings173.1 – 173.477
Subpart GGases; Preparation and Packaging173.300 – 173.340
§ 173.300 [Reserved]
§ 173.301General requirements for shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles, and spherical pressure vessels.
§ 173.301aAdditional general requirements for shipment of specification cylinders.
§ 173.301bAdditional general requirements for shipment of UN pressure receptacles.
§ 173.302Filling of cylinders with nonliquefied (permanent) compressed gases or adsorbed gases.
§ 173.302aAdditional requirements for shipment of non-liquefied (permanent) compressed gases in specification cylinders.
§ 173.302bAdditional requirements for shipment of non-liquefied (permanent) compressed gases in UN pressure receptacles.
§ 173.302cAdditional requirements for the shipment of adsorbed gases in UN pressure receptacles.
§ 173.303Charging of cylinders with compressed gas in solution (acetylene).
§ 173.304Filling of cylinders with liquefied compressed gases.
§ 173.304aAdditional requirements for shipment of liquefied compressed gases in specification cylinders.
§ 173.304bAdditional requirements for shipment of liquefied compressed gases in UN pressure receptacles.
§ 173.305Charging of cylinders with a mixture of compressed gas and other material.
§ 173.306Limited quantities of compressed gases.
§ 173.307Exceptions for compressed gases.
§ 173.308Lighters.
§ 173.309Fire extinguishers.
§ 173.310Exceptions for radiation detectors.
§ 173.311Metal Hydride Storage Systems.
§ 173.312Requirements for shipment of MEGCs.
§ 173.313UN Portable Tank Table for Liquefied Compressed Gases and Chemical Under Pressure.
§ 173.314Compressed gases in tank cars and multi-unit tank cars.
§ 173.315Compressed gases in cargo tanks and portable tanks.
§ 173.316Cryogenic liquids in cylinders.
§ 173.318Cryogenic liquids in cargo tanks.
§ 173.319Cryogenic liquids in tank cars.
§ 173.320Cryogenic liquids; exceptions.
§ 173.321Ethylamine.
§ 173.322Ethyl chloride.
§ 173.323Ethylene oxide.
§ 173.334Organic phosphates mixed with compressed gas.
§ 173.335Chemical under pressure n.o.s.
§ 173.336Nitrogen dioxide, liquefied, or dinitrogen tetroxide, liquefied.
§ 173.337Nitric oxide.
§ 173.338Tungsten hexafluoride.
§ 173.340Tear gas devices.