49 CFR § 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|
|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||2.2||Non-flammable compressed gas||173.115|
|3||Flammable and combustible liquid||173.120|
|4||4.2||Spontaneously combustible material||173.124|
|4||4.3||Dangerous when wet material||173.124|
|6||6.2||Infectious substance (Etiologic agent)||173.134|
|9||Miscellaneous hazardous material||173.140|
|None||Other regulated material: ORM-D||173.144|