IATA Class 2 Three Divisions

Division 2.1 is for flammable gases. These gases can ignite when mixed with a certain volume of air (13% or less), or have a flammable range with air, which is determined by tests and calculations. Examples of Division 2.1 flammable gases include hydrogen and acetylene. Division 2.1 labels are red with a white or black flame symbol on the top and the class number and any text on the bottom.

Division 2.2 is for non-flammable and non-toxic gases. These gases may be asphyxiation or oxidizing hazards. Gases that are asphyxiants dilute or replace the amount of oxygen in the atmosphere and cause suffocation. Oxidizing gases may cause or contribute to combustion of other materials. Division 2.2 also includes other gases that do not meet the conditions for Division 2.1 or Division 2.3. Examples of these gases include nitrogen or neon. Division 2.2 labels have a green background and a gas cylinder symbol, class number, and any text printed in white or black.

Division 2.3 is for toxic gases. These gases are known, or presumed, to be toxic or corrosive to people and cause health hazards. They have an LC50 value equal to or less than 5,000 mL/m3 (ppm). If these gases have corrosive properties, they must be classified with a subsidiary corrosive risk. Examples of these gases include chlorine and cyanide. Division 2.3 labels have a white background with a black skull and crossbones symbol, class number, and any text printed in black.

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