CELEX 02008R1272 · v20250901

2.12. Substances and mixtures which in contact with water emit flammable gases

Substances or mixtures which, in contact with water, emit flammable gases means solid or liquid substances or mixtures which, by interaction with water, are liable to become spontaneously flammable or to give off flammable gases in dangerous quantities.

2.12.2. Classification criteria

2.12.2.1. A substance or mixture which, in contact with water, emits flammable gases shall be classified in one of the three categories for this class, using test N.5 in Part III, sub-section 33.4.1.4 of the ►M4 UN RTDG ◄ , Manual of Tests and Criteria, in accordance with Table 2.12.1:

▼M19

Table 2.12.1

Criteria for substances and mixtures, which in contact with water, emit flammable gases

Category	Criteria
1	Any substance or mixture which reacts vigorously with water at ambient temperatures and demonstrates generally a tendency for the gas produced to ignite spontaneously, or which reacts readily with water at ambient temperatures such that the rate of evolution of flammable gas is equal to or greater than 10 litres per kilogram of substance over any one minute.
2	Any substance or mixture which reacts readily with water at ambient temperatures such that the maximum rate of evolution of flammable gas is equal to or greater than 20 litres per kilogram of substance per hour, and which does not meet the criteria for Category 1.
3	Any substance or mixture which reacts slowly with water at ambient temperatures such that the maximum rate of evolution of flammable gas is greater than 1 litre per kilogram of substance per hour, and which does not meet the criteria for Categories 1 and 2.

Note:

The test shall be performed on the substance or mixture in its physical form as presented. If, for example, for the purposes of supply or transport, the same chemical is to be presented in a physical form different from that which was tested and which is considered likely to materially alter its performance in a classification test, the substance must also be tested in the new form.

▼B

2.12.2.2. A substance or mixture shall be classified as a substance or mixture which in contact with water emits flammable gases if spontaneous ignition takes place in any step of the test procedure.

2.12.3. Hazard Communication

Label elements shall be used for substances or mixtures meeting the criteria for classification in this hazard class in accordance with Table 2.12.2.

▼M12

Table 2.12.2

Label elements for substances and mixtures which in contact with water emit flammable gases

Classification	Category 1	Category 2	Category 3
GHS Pictograms
Signal Word	Danger	Danger	Warning
Hazard Statement	H260: In contact with water releases flammable gases which may ignite spontaneously	H261: In contact with water releases flammable gases	H261: In contact with water releases flammable gases
Precautionary Statement Prevention	P223 P231 + P232 P280	P223 P231 + P232 P280	P231 + P232 P280
Precautionary Statement Response	P302 + P335 + P334 P370 + P378	P302 + P335 + P334 P370 + P378	P370 + P378
Precautionary Statement Storage	P402 + P404	P402 + P404	P402 + P404
Precautionary Statement Disposal	P501	P501	P501

▼B

2.12.4. Additional Classification Considerations

2.12.4.1. The classification procedure for this class need not be applied if:

(a)

the chemical structure of the substance or mixture does not contain metals or metalloids; or

(b)

experience in production or handling shows that the substance or mixture does not react with water, e.g. the substance is manufactured with water or washed with water; or

(c)

the substance or mixture is known to be soluble in water to form a stable mixture.

Source: Content sourced from EUR-Lex and licensed under CC BY 4.0. This is an unofficial presentation; only the official EUR-Lex version is legally authentic.

2.12. Substances and mixtures which in contact with water emit flammable gases