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2.5.2.: Classification criteria

2.5.2.1. Gases under pressure shall be classified, according to their physical state when packaged, in one of four groups in accordance with Table 2.5.1:

Table 2.5.1

Criteria for gases under pressure

Group	Criteria
Compressed gas	A gas which when packaged under pressure is entirely gaseous at – 50 °C; including all gases with a critical temperature ≤ – 50 °C.
Liquefied gas	A gas which, when packaged under pressure, is partially liquid at temperatures above – 50 °C. A distinction is made between: (i) high pressure liquefied gas: a gas with a critical temperature between – 50 °C and + 65 °C; and (ii) low pressure liquefied gas: a gas with a critical temperature above + 65 °C.
Refrigerated liquefied gas	A gas which when packaged is made partially liquid because of its low temperature.
Dissolved gas	A gas which when packaged under pressure is dissolved in a liquid phase solvent.
Note: Aerosols shall not be classified as gases under pressure. See section 2.3.

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