ADR Class 2: Gases

The title of gases covers pure gases, mixtures of gases, mixtures of one or more gases with other materials and objects containing them. Gas is understood to mean:

Class 2 Divisions

Class 2 materials and objects are subdivided into:

Class 2 ADR groups

Substances and articles of Class 2 with the exception of aerosols and chemicals in pressure vessels are assigned to the following groups according to their hazardous properties:

The groups with the letter T prevail over the other groups of letters, i.e. F, O, A, in the same way that the letter F prevails over O, A. Corrosivity for gases is considered a criterion of toxicity, i.e. corrosive gases are considered toxic: TC, TFC, TOC.


Class 2 materials and objects not mentioned in Table A of Chapter 3.2 are assigned to the collective heading of Table by applying the following criteria:


Aerosols are assigned to a group listed below based on hazardous properties:

The classification depends on the nature of the contents of the aerosol generator.

Pressurized chemicals

Pressurized chemicals are assigned to the following groups according to their hazardous properties:

The classification will depend on the hazard characteristics of the components in the different states (Dispersing Agent, Liquid or Solid). The following criteria will be applied to assign the groups:

Personal protective equipment for Class 2

When handling ADR Class 2 materials, you must be properly equipped to be prepared for any incident that may occur. The necessary equipment is:

Materials with a flash point equal to or lower than 61ºC must have the correct electrical conductivity for their correct handling. Therefore, equipotential connections and grounding points must exist throughout the plant in order to dissipate electrical charges and return them to ground, minimizing dangerous potentials.

Package labeling

When ADR shipments of Class 2 materials are made, labeling must be visible together with the approval markings on the containers and packages.

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