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Physical & Chemical properties

Explosiveness

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Description of key information

3,4-Dichloronitrobenzene does not show explosive properties (Currenta, 2009a).

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

According to the screening procedure as described in Annex I, section 2.1.4.2 of EC Directive 1272/2008, the presence of the NO2 group and the large exothermic decomposition energy identify 3, 4-Dichloronitrobenzene as a potential explosive, and the acceptance procedure (see section 10.3 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria) has to be performed. However, the structurally very similar 2, 4-Dichloronitrobenzene has been tested extensively (see report 2009/01427, Currenta, 2009b). This compound has a decomposition energy of 1650 J/g with an onset of 320 °C. In testing, it was found that this compound should not be classified as an explosive. It can be concluded that the closely related 3, 4-Dichloronitrobenzene which is less energetic should not be an explosive either.

Justification for classification or non-classification

Differential Thermal Analysis

Onset of exotherm reaction: 325 °C

Heat release: 1350 J/g

A study was performed with 1,3 -dichloro-4 -nitrobenzene which is a structural analogue to 1,2 -dichloro-4 -nitrobenzene. Both substances consist of one benzene ring, one NO2 -group and two chlorine-substituents which are directly linked with the respective aromatic carbon atoms. The difference between these two substances is merely the position of the chlorine-substituents compared to the NO2 -group. It is assumed that explosive properties are caused by the presence of certain chemical moieties rather than their position within the molecule.

This decision is in accordance with the grouping of substances and read-across approach in Annex XI, 1.5 of the REACH Regulation.

Differential Thermal Analysis

Onset of exotherm reaction: 320 °C

Heat release: 1650 J/g

Trauzl Test (UN F.3)

2, 4-Dichloronitrobenzene exhibits some explosive power and further tests have to be performed.

Propagation of detonation (UN A.1, BAM 50/60 steel tube test)

2, 4-Dichloronitrobenzene is not able to propagate a detonation. From these findings it can be concluded that 2, 4-Dichloronitrobenzene is not sensitive to detonative shock (UN 2(a)).

Koenen Test (UN 2(b))

2, 4-Dichloronitrobenzene shows no violent effect on heating under confinement.

Time-pressure-test (UN 1(c), UN 2 (c))

2, 4-Dichloronitrobenzene shows no likelihood of deflagration.