Canada Road & Rail Transport - Class 2 Divisions

Class 2, Gases, has three divisions.

Class 2.1, Flammable Gases, consists of gases that, at 20 degrees Celsius and an absolute pressure of 101.3 kilopascals, have the following characteristics:

• Are ignitable when in a mixture of 13 percent or less by volume with air
• Have a flammability range with air of at least 12 percentage points determined in accordance with tests or calculations in International Standard for Organization (ISO) 10156

Class 2.2, Non-flammable and Non-toxic Gases, consists of gases that are transported at an absolute pressure greater than or equal to 280 kilopascals at 20 degrees Celsius, or as refrigerated liquids, and that are not included in Class 2.1, Flammable Gases, or Class 2.3, Toxic Gases.

Class 2.3, Toxic Gases, consists of gases that are known to be toxic or corrosive to humans according to CGA P-20, ISO Standard 10298 or other documentary evidence published in technical journals or government publications. Class 2.3 gases also have an LC₅₀ value less than or equal to 5,000 millilitres per cubic litre.

To learn more about Transporting Dangerous Goods in Canada visit our Transporting Dangerous Good by Road & Rail Online Training web page.