CELEX 02008R1272 · v20250901

2.5. Gases under pressure

2.5.1.1. ►M4 Gases under pressure are gases which are contained in a receptacle at a pressure of 200 kPa (gauge) or more at 20 °C, or which are liquefied or liquefied and refrigerated. ◄

They comprise compressed gases, liquefied gases, dissolved gases and refrigerated liquefied gases.

2.5.1.2. The critical temperature is the temperature above which a pure gas cannot be liquefied, regardless of the degree of compression.

▼M4

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.

▼B

2.5.3. Hazard Communication

Label elements shall be used for substances or mixtures meeting the criteria for classification in this hazard class in accordance with Table 2.5.2.

▼M12

Table 2.5.2

Label elements for gases under pressure

Classification	Compressed gas	Liquefied gas	Refrigerated liquefied gas	Dissolved gas
GHS Pictograms
Signal Word	Warning	Warning	Warning	Warning
Hazard Statement	H280: Contains gas under pressure; may explode if heated	H280: Contains gas under pressure; may explode if heated	H281: Contains refrigerated gas; may cause cryogenic burns or injury	H280: Contains gas under pressure; may explode if heated
Precautionary Statement Prevention			P282
Precautionary Statement Response			P336 + P315
Precautionary Statement Storage	P410 + P403	P410 + P403	P403	P410 + P403
Precautionary Statement Disposal

▼M2

Note:

Pictogram GHS04 is not required for gases under pressure where pictogram GHS02 or pictogram GHS06 appears.

▼B

2.5.4. Additional Classification Considerations

For this group of gases, the following information is required to be known:

—

the vapour pressure at 50 oC;

—

the physical state at 20 oC at standard ambient pressure;

—

the critical temperature.

▼M4

Data can be found in the literature, calculated or determined by testing. Most pure gases are already classified in the UN RTDG, Model Regulations.

▼B

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2.5. Gases under pressure