The HAZMAT Class 2inUnited States law includes all gases which are compressed and stored for transportation. Class 2 has three divisions: Flammable (also called combustible), Non-Flammable/Non-Poisonous, and Poisonous. This classification is based on the United Nations' Recommendations on the Transport of Dangerous Goods - Model Regulations. In Canada, the Transportation of Dangerous Goods Regulations, or TDGR, are also based on the UN Model Regulations and contain the same three divisions.
Agas is a substance which
Gases are assigned to one of three divisions
Aerosols also fall into Class 2 divisions where an aerosol is defined as an article consisting of any non-refillable receptacle containing a gas compressed, liquefied or dissolved under pressure, the sole purpose of which is to expel a nonpoisonous (other than a Division 6.1 Packing Group III material) liquid, paste, or powder and fitted with a self-closing release device allowing the contents to be ejected by the gas.
Division 2.1: Flammable, Non-Toxic Gas
Flammable gas means any material that:
The following applies to aerosols:
Division 2.2: Non-Flammable, Non-Toxic 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:
A non-flammable gas means any material that:
The following applies to aerosols:
Division 2.3: Toxic Gas
Gas poisonous by inhalation means a material which is a gas at 20 °C or less and a pressure of 101.3 kPa (a material which has a boiling point of 20 °C or less at 101.3kPa (14.7 psi)) and which:
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Weight | 1.1 | 1.2 | 1.3 | 1.4 | 1.5 | 1.6 | 2.1 | 2.2 | 2.2 | 2.3 | 3 | 4.1 | 4.2 | 4.3 | 5.1 | 5.2 | 6.1 | 7 | 8 | |||
A | B | A | ||||||||||||||||||||
2.1 | 1,001 lb (454 kg) | ![]() |
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O | ![]() |
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O | O | O | ||||||||||||
2.2 | 1,001 lb (454 kg) | B | ![]() |
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O | ||||||||||||||||
2.2 | 1,001 lb (454 kg) | B | ![]() |
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O | ||||||||||||||||
2.3A | Any Quantity | ![]() |
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O | ![]() |
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2.3B | Any Quantity | ![]() |
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O | ![]() |
O | O | O | O | O | O | O | |||||||||
Key | ||||||||||||||||||||||
The absence of any hazard class or division or a blank space in the table indicates that no restrictions apply.
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