| Class | Description | Symbol Image |
| Class 1 - Explosives | |
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| SubClass 1.1 - Substances and articles which have a mass explosion hazard. | Consists of explosives that have a mass explosion hazard. A mass explosion is one which affects almost the entire load instantaneously. |
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| SubClass 1.2 - Substances and articles which have a projection hazard but not a mass explosion hazard. | Consists of explosives that have a projection hazard but not a mass explosion hazard. |
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| SubClass 1.3 - Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard. | Consists of explosives that have a fire hazard and either a minor blast hazard or a minor projection hazard or, both but not a mass explosion hazard. |
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| SubClass 1.4 - Substances and articles which present no significant hazard. | Consists of explosives that present a minor explosion hazard. The explosive effects are largely confined to the package and no projection of fragments of appreciable size or range is to be expected. An external fire must not cause virtually instantaneous explosion of almost the entire contents of the package. |
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| SubClass 1.5 - Very insensitive substances which have a mass explosion hazard. | Consists of very insensitive explosives. This division is comprised of substances which have a mass explosion hazard but are so insensitive that there is very little probability of initiation or of transition from burning to detonation under normal conditions of transport |
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| SubClass 1.6 - Extremely insensitive articles which do not have a mass explosion hazard. | Consists of extremely insensitive articles which do not have a mass explosive hazard. This division is comprised of articles which contain only extremely insensitive detonating substances and which demonstrate a negligible probability of accidental initiation or propagation. |
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| Class 2 - Gases: Compressed, Liquefied or Dissolved under Pressure | |
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| SubClass 2.1 - Flammable Gas | 454 kg (1001 lbs) of any material which is a gas at 20°C (68°F) or less and 101.3 kPa (14.7 psi) of pressure (a material which has a boiling point of 20°C (68°F) or less at 101.3 kPa (14.7 psi)) which-
1. Is ignitable at 101.3 kPa (14.7 psi) when in a mixture of 13 percent or less by volume with air; or
2. Has a flammable range at 101.3 kPa (14.7 psi) with air of at least 12 percent regardless of the lower limit. |
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| SubClass 2.2 - Non-flammable, Non-poisonus Gas | This division includes compressed gas, liquefied gas, pressurized cryogenic gas, compressed gas in solution, asphyxiant gas and oxidizing gas. A non-flammable, nonpoisonous compressed gas (Division 2.2) means any material (or mixture) which- 1. Exerts in the packaging an absolute pressure of 280 kPa (40.6 psia) or greater at 20°C (68°F), and 2. Does not meet the definition of Division 2.1 or 2.3. |
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