Almost every hazmat rule traces back to one place: the Hazardous Materials Table. It is the master reference that says, for each regulated material, exactly how it is classified and handled. You do not have to memorize it, but understanding how to read it ties the whole system together.
This is study guidance, not regulatory advice. The table is in 49 CFR 172.101 and your official state CDL manual.
What the table is
The Hazardous Materials Table lists materials by their proper shipping name and, reading across each row, gives the key facts a shipper needs to classify and prepare the material. It is the single source that the placards, labels, markings, and shipping papers all derive from.
Reading across a row
| Column | What it gives you |
|---|---|
| Symbols | Special conditions, such as plus signs or letters |
| Proper shipping name | The official name and description |
| Hazard class or division | For example 3 or 6.1 |
| Identification number | The four-digit UN or NA number |
| Packing group | I, II, or III |
| Label codes | Which labels the package needs |
| Special provisions | Exceptions and extra requirements |
| Packaging | The authorized packaging sections |
| Quantity limitations | Limits by transport mode |
| Vessel stowage | Requirements for transport by water |
How it is used
A shipper finds the material by its proper shipping name, then reads across to get the hazard class, the four-digit identification number, the packing group, and the rest. That information is what determines the placards and what appears on the shipping papers. It is the practical answer to what makes a material hazardous and how it is classified.
Where it fits
For a driver, the table is mostly behind the scenes, but knowing it exists explains where every classification comes from. For the federal framework, see the FMCSA hazardous materials regulations and the PHMSA hazmat resources.
Frequently asked questions
What is the Hazardous Materials Table?
It is the master list in 49 CFR 172.101 that defines how each regulated material is classified and handled. Reading across a row gives the proper shipping name, hazard class, identification number, packing group, and more.
What information is in the Hazardous Materials Table?
Each row gives the proper shipping name, hazard class or division, four-digit identification number, packing group, label codes, special provisions, authorized packaging, quantity limitations, and vessel stowage.
Do drivers need to memorize the Hazardous Materials Table?
No. The table is mainly a shipper’s tool for classifying materials. Drivers benefit from understanding how it works, since it is where the placards and shipping paper details come from.
What is the best way to study the hazmat table for the CDL test?
Focus on understanding the columns and how a material is looked up, rather than memorizing entries, and keep your placard recognition sharp with an app such as CDL Placards. Your state CDL manual is the authority.
