Commercial Driver License Handbook.
| Appendix A—Table Of Hazard Class Definitions | |
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| Hazard Class and Division | Definition |
| Class 1—Explosives | |
| Division 1.1 | Explosives that have a mass explosion hazard (affects almost the entire load instantaneously). (Refer to 49CFR 173.50(b)[1].) |
| Division 1.2 | Explosives that have a projection hazard but not a mass explosion hazard. (Refer to 49CFR 173.50 (b)[2].) |
| Division 1.3 | Explosives that have a fire hazard and either a minor blast or projection hazard or both, but not a mass explosion hazard. (Refer to 49CFR 173.50 (b)[3].) |
| Division 1.4 | Explosives that present a minor explosion hazard (effects are largely confined to the package). (Refer to 49CFR 173.50 (b)[4].) |
| Division 1.5 | Explosives that are very insensitive (very little probability of detonation under normal transport condition). (Refer to 49CFR 173.50 (b)[5].) |
| Division 1.6 | Articles which do not have a mass explosive hazard (negligible probability of accidental detonation). (Refer to 49CFR 173.50 (b)[6].) |
| Class 2—Gases | |
| Division 2.1 | Flammable gas is any material which is a gas at 20°C (68°F) or less and 101.3 kPa (14.7 psi) of pressure and is ignitable when mixed with air. (Refer to 49CFR 173.115[a].) |
| Division 2.2 | Division 2.2 includes non-flammable, non-poisonous compressed gas including compressed gas, liquefied gas, pressurized cryogenic gas and compressed gas in solution, asphyxiant gas, or oxidizing gas with an absolute pressure of 280 kpa (40.6 PSIA) or greater at 20°C (68°F). (Refer to 49CFR 173.115[b].) |
| Division 2.3 | A gas poisonous by inhalation is a gas which is known to be so toxic to humans as to pose a hazard to health during transportation. (Refer to 49CFR 173.115[c].) |
| Class 3—Flammable Liquids | |
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A flammable liquid means a liquid having a flash point of not more than 60.5°C (141°F), or any material in a liquid phase with a flash point at or above 37.8°C (100°F) that is intentionally heated and offered for transport, or transported at or above its flash point in a bulk package, with the following exceptions:
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| Class 4—Flammable Solids | |
| Division 4.1 |
A flammable solid means any of the following three types of material: 1. Desensitized Explosives that: A) when dry are explosives Class 1 other than those of compatibility group A, which are wetted with sufficient water, alcohol, or plasticizer to suppress explosive properties; and B) are specifically authorized by name and hazard class by the Associate Administrator for Hazardous Materials under the provisions of an exemption issued under subchapter A of 49 CFR or an approval issued under 49 CFR 173.56(i). 2. Self-reactive materials are materials that are liable to undergo, at normal or elevated temperature, a strong exothermal decomposition caused by excessively high transport temperatures or by contamination, even without participation of oxygen (air). 3. Readily combustible materials are materials that are solids which may cause fire through friction such as matches; shows a burn rate of more than 2.2 mm (0.087 inches); or any metal powders that can be ignited and react over the whole length of the sample in 10 minutes or less. |
| Division 4.2 |
A spontaneously combustible material means: 1. A Pyrophoric Material—a liquid or solid that, even in small quantities, and without an external ignition source, can ignite within five minutes after coming in contact with air. 2. A Self-heating Material—a material that, when in contact with air and without an energy supply is liable to self heat. A material of this type which exhibits spontaneous ignition or if the temperature of a sample exceeds 200°C (392°F) in 24 hours is a Division 4.2 material. |
| Division 4.3 | A dangerous when wet
material is a material that, by contact with water, is liable to become spontaneously flammable or to give off flammable or toxic gas. (Refer to 49 CFR 173.124 [c].) |
| Class 5—Oxidizing Materials | |
| Division 5.1 | An oxidizer is any material that may, generally by yielding oxygen, cause or enhance the combustion of other materials. (Refer to 49 CFR 173.127 [a].) |
| Division 5.2 | Organic peroxide is a compound containing oxygen (O) in the bivalent -O-O structure and which may be considered a derivative of hydrogen peroxide where one or more of the hydrogen atoms have been replaced by organic radicals. (Refer to 49 CFR 173.128 [a].) |
| Class 6—Poisonous/Infectious Substances | |
| Division 6.1 | A poisonous material is any material, other than a gas, which is known to be so toxic to humans that it causes a hazard to health during transportation. (Refer to 49 CFR 173.132 [a].) |
| Division 6.2 | An infectious substance is a viable microorganism, or its toxin, which causes or may cause disease in humans or animals. (Refer to 49 CFR 173.134 [a].) |
| Class 7—Radioactive Materials (Refer to 49 CFR 173.403.) | |
| Class 8—Corrosive Materials | |
| A corrosive material is any liquid or solid that causes visible destruction or irreversible alterations in human skin tissue at the site of contact, or a liquid that has a severe corrosion rate on steel or aluminum. (Refer to 49 CFR 173.136 [a].) | |
| Class 9—Miscellaneous Hazardous Materials | |
| A miscellaneous hazardous material is any material which presents a hazard during transportation but which does not meet the definition of any other hazard class. (Refer to 49 CFR 173.140.) | |
| ORM-D Materials | |
| Other Regulated Materials (ORM) means a material such as a consumer commodity, which, although otherwise subject to the regulations of 49 CFR 173, presents a limited hazard during transportation due it its form, quantity, and packaging. (Refer to 49 CFR 173.144.) | |
| Combustible Liquids | |
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A combustible liquid is any liquid that does not meet the definition of any other hazard class and has a flash point above 141°F, but less than 220°F. (Refer to 49 CFR 173.120[a]). NOTE: Some flammable liquids with a flash point at or above 100°F may be reclassed as combustible liquid for domestic transportation (Refer to 49 CFR 173.120[b]). |
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