3. HAZARDOUS MATERIALS

Similar to the definition provided in PHMSA's online glossary, the US. Code of Federal Regulations 0149 CFR 397.65 defines "hazardous material" 05:

Hazardous materials are categorized in nine specific classes. Each class is based on various characteristics 01 the substance or material, such as physical state and risk potential. Classes are Further delineated into divisions, allowing for more detailed specificolion 01 the materials or substances. The table that tONOWS highlights key classes

and divisions:

HAZARDOUS MATERIALS

Table 1. Classes and Division: of Hazardous Materials m

FIAMMABLE
GASES

4
4.1	Flammable Solids
42	Sponttaanneeoouuslsyt combustible materials Dcngurous-when-wet materials OXIDIZERS AND ORGANIC PEROXIDES
4.3
5
5.1	Oxidizers
5.2	Organic Peroxide POISONOUS (TOXIC) MATERIALS AND INFECTIOUS
6 (53.1
65..2?
7
8
9