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Gases: compressed, liquefied or dissolved under pressure

IMO classes for dangerous goods

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 IMO classes:Class 1Class 2Class 3Class 4Class 5Class 6Class 7Class 8Class 9

Gases: compressed, liquefied or dissolved under pressure

Flammable gas  
Subclass 2.1: Flammable Gas

Gases which ignite on contact with an ignition source, such as acetylene and hydrogen. Flammable gas gas means any material which is ignitable at 101.3 kPa (14.7 psi) when in a mixture of 13 percent or less by volume with air, or has a flammable range at 101.3 kPa (14.7 psi) with air of at least 12 percent regardless of the lower limit.
Nonflammable Gas
Subclass 2.2: Non-Flammable Gases

Gases which are neither flammable nor poisonous. Includes the cryogenic gases/liquids (temperatures of below -100°C) used for cryopreservation and rocket fuels. 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 means any material which exerts in the packaging an absolute pressure of 280 kPa (40.6 psia) or greater at 20°C (68°F), and does not meet the definition of Division 2.1 or 2.3.
Poisonous Gas
Inhalation Hazard
Subclass 2.3: Poisonous Gases

Gases liable to cause death or serious injury to human health if inhaled. 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)) which is known to be so toxic to humans as to pose a hazard to health during transportation, or in the absence f adequate data on human toxicity, is presumed to be toxic to humans because when tested on laboratory animals it has an LC50 value of not more than 5000 ml/m3.

Class 1 - Explosives hazard
Class 2 - Gases: compressed, liquefied or dissolved under pressure
Class 3 - Flammable liquids
Class 4 - Flammable solids or substances
Class 5 - Oxidizing substances and organic peroxides
Class 6 - Toxic and infectious substances
Class 7 - Radioactive substances
Class 8 - Corrosive substances
Class 9 - Miscellaneous dangerous substances and articles
Other hazardous materials

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