§  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.

 
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                                                                49 CFR
                   Division                                   reference
   Class No.       No. (if      Name of class or division        for
                     any)                                    definitions
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None             ...........  Forbidden materials..........       173.21
None             ...........  Forbidden explosives.........       173.54
1                        1.1  Explosives (with a mass             173.50
                               explosion hazard).
1                        1.2  Explosives (with a projection       173.50
                               hazard).
1                        1.3  Explosives (with                    173.50
                               predominately a fire hazard).
1                        1.4  Explosives (with no                 173.50
                               significant blast hazard).
1                        1.5  Very insensitive explosives;        173.50
                               blasting agents.
1                        1.6  Extremely insensitive               173.50
                               detonating substances.
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          173.120
                               liquid.
4                        4.1  Flammable solid..............      173.124
4                        4.2  Spontaneously combustible          173.124
                               material.
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               173.134
                               (Etiologic agent).
7                ...........  Radioactive material.........      173.403
8                ...........  Corrosive material...........      173.136
9                ...........  Miscellaneous hazardous            173.140
                               material.
None             ...........  Other regulated material: ORM-     173.144
                               D.
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[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]