49 CFR 173.2 - Hazardous materials classes and index to hazard class definitions.

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§ 173.2 Hazardous materials classes and index to hazard class definitions.
The hazard class of a hazardous material is indicated either by its class (or division) number, its class name, or by the letters “ORM-D”. 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.
Class No. Division No. (if any) Name of class or division 49 CFR reference for definitions
None Forbidden materials 173.21
None Forbidden explosives 173.54
1 1.1 Explosives (with a mass explosion hazard) 173.50
1 1.2 Explosives (with a projection hazard) 173.50
1 1.3 Explosives (with predominately a fire hazard) 173.50
1 1.4 Explosives (with no significant blast hazard) 173.50
1 1.5 Very insensitive explosives; blasting agents 173.50
1 1.6 Extremely insensitive detonating substances 173.50
2 2.1 Flammable gas 173.115
2 2.2 Non-flammable compressed gas 173.115
2 2.3 Poisonous gas 173.115
3 Flammable and combustible liquid 173.120
4 4.1 Flammable solid 173.124
4 4.2 Spontaneously combustible material 173.124
4 4.3 Dangerous when wet material 173.124
5 5.1 Oxidizer 173.127
5 5.2 Organic peroxide 173.128
6 6.1 Poisonous materials 173.132
6 6.2 Infectious substance (Etiologic agent) 173.134
7 Radioactive material 173.403
8 Corrosive material 173.136
9 Miscellaneous hazardous material 173.140
None Other regulated material: ORM-D 173.144
[Amdt. 173-224, 55 FR 52606, Dec. 21, 1990, as amended at 57 FR 45460, Oct. 1, 1992; Amdt. 173-234, 58 FR 51531, Oct. 1, 1993]

Title 49 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 49.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-07-11; vol. 79 # 133 - Friday, July 11, 2014
    1. 79 FR 40590 - Hazardous Materials: Compatibility With the Regulations of the International Atomic Energy Agency (RRR)
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Pipeline and Hazardous Materials Safety Administration
      Final rule.
      Effective date: October 1, 2014. Voluntary compliance date: PHMSA is authorizing voluntary compliance beginning July 11, 2014. Delayed compliance date: Unless otherwise specified, compliance with the amendments adopted in this final rule is required beginning July 13, 2015. Incorporation by reference date: The incorporation by reference of certain publications listed in this rule is approved by the Director of the Federal Register as of October 1, 2014.
      49 CFR Parts 171, 172, 173, 174, 175, 176, 177 and 178

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United States Code

Title 49 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 49 CFR 173 after this date.

  • 2014-07-15; vol. 79 # 135 - Tuesday, July 15, 2014
    1. 79 FR 41185 - Hazardous Materials: Requirements for the Safe Transportation of Bulk Explosives (RRR)
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Pipeline and Hazardous Materials Safety Administration
      Notice of proposed rulemaking (NPRM).
      Comments must be submitted by September 15, 2014. To the extent possible, PHMSA will consider late-filed comments as a final rule is developed.
      49 CFR Parts 171, 172, 173, and 177