The hazard class of a hazardous material is indicated by either the class or division number or the class name. The following table lists class numbers, division numbers, class or division names and those sections of this subchapter which contain definitions for classifying hazardous materials, including forbidden materials.

Table 1 to § 173.2

Class No.Division
number
(if applicable)		Name of class or division49 CFR reference for
definitions
NoneFORBIDDEN MATERIALS173.21
NoneFORBIDDEN EXPLOSIVES173.54
11.1EXPLOSIVES (WITH A MASS EXPLOSION HAZARD)173.50
11.2EXPLOSIVES (WITH A PROJECTION HAZARD)173.50
11.3EXPLOSIVES (WITH PREDOMINATELY A FIRE HAZARD)173.50
11.4EXPLOSIVES (WITH NO SIGNIFICANT BLAST HAZARD)173.50
11.5VERY INSENSITIVE EXPLOSIVES; BLASTING AGENTS173.50
11.6EXTREMELY INSENSITIVE DETONATING SUBSTANCES173.50
22.1FLAMMABLE GAS173.115
22.2NON-FLAMMABLE COMPRESSED GAS173.115
22.3POISONOUS GAS173.115
3FLAMMABLE AND COMBUSTIBLE LIQUID173.120
44.1FLAMMABLE SOLID173.124
44.2SPONTANEOUSLY COMBUSTIBLE MATERIAL173.124
44.3DANGEROUS WHEN WET MATERIAL173.124
55.1OXIDIZER173.127
55.2ORGANIC PEROXIDE173.128
66.1POISONOUS MATERIALS173.132
66.2INFECTIOUS SUBSTANCE (ETIOLOGIC AGENT)173.134
7RADIOACTIVE MATERIAL173.403
8CORROSIVE MATERIAL173.136
9MISCELLANEOUS HAZARDOUS MATERIAL173.140
[87 FR 79774, Dec. 27, 2022]
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