1,2-dichloro-4-nitrobenzene

Explosiveness

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Principles of method if other than guideline:

differential thermal analysis (DTA) according to VDI 2263, leaf 1
Test Series 1 and 2, of the UN Recommendations on the Transport of Dangerous Good, Manual of Tests and Criteria

GLP compliance:

no

Parameter:

other: Explosiveness

Remarks on result:

negative (not further specified)

Study was performed with 1,3 -dichloro-4 -nitrobenzene which is a structural isomer of 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.

Differential Thermal Analysis

Onset of exotherm reaction: 320 °C

Heat release: 1650 J/g

 

Trauzl Test (UN F.3)

The expansion of the lead block is 26.1 mL and 30.2 mL per 10 g of sample. Therefore, 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)

Observation: Tube fragmented at upper end; fragmented length: 166 mm Substance ejected completely

Result: No

Tube fragmented at upper end; fragmented length: 172 mm Substance ejected completely

Result: No

Therefore, 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))

The tube remained unchanged in any test with an orifice diameter of 2 mm and 6 mm. Therefore, 2, 4-Dichloronitrobenzene shows no violent effect on heating under confinement.

 

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

In none of the three test runs, the pressure reached 2070 kPa. Therefore, 2, 4-Dichloronitrobenzene shows no likelihood of deflagration.

Interpretation of results:

GHS criteria not met

Remarks:

EU GHS criteria not met

Conclusions:

Explosiveness test were done according to the UN test series 1 and 2. Based on conducted tests result, 2, 4-Dichloronitrobenzene does not show explosive properties.

Executive summary:

Explosiveness test were done according to the UN test series 1 and 2. Based on conducted tests result, 2, 4-Dichloronitrobenzene does not show explosive properties.

Reference 2

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Principles of method if other than guideline:

Investigation on the explosive properties using thermal analysis (DTA) according to VDI 2263, leaf 1.

GLP compliance:

no

Parameter:

other: Explosiveness

Remarks on result:

other: negative

Decomposition behavior

Substance contains the NO₂ group which is associated with explosive properties (European CLP Directive, EC no 1272/2008 and UN Manual of tests criteria, appendix6, section 3)

The decomposition behaviour was determined by different thermal analysis (DTA) according to VDI 2263, leaf 1. The sample was heated in a closed glass crucible at a rate of 3 K/min. The temperature difference between sample and reference was recorded.

Test method	Result		Diagram	Remarks
	Onset of exotherm	Heat release
DTA (3 K/min, glass crucible)	325°C	1350 J/g	1	Melting point at about 40°C

 

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 (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. 3, 4-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Interpretation of results:

GHS criteria not met

Remarks:

EU GHS criteria not met

Conclusions:

Test item contains No2 group and the large exothermic decomposition energy identify that substance as a potential explosive. However, the structurally similar 2,4-dichloronitrobenzene has been tested extensively. 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. 3, 4-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Executive summary:

Test item contains No2 group and the large exothermic decomposition energy identify that substance as a potential explosive. However, the structurally similar 2,4-dichloronitrobenzene has been tested extensively. 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. 3, 4-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Description of key information

Test item contains No2 group and the large exothermic decomposition energy identify that substance as a potential explosive. However, the structurally similar 2,4-dichloronitrobenzene has been tested extensively. 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. 3, 4-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

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

Based on explosiveness tests on substance and its isomer, 1,2-Dichloro-4-nitrobenzene does not need to be classified as explosive property.