1,2-dichloro-3-nitrobenzene

Explosiveness

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

explosiveness, other

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: differential thermal analysis (DTA) according to VDI 2263, leaf 1

Deviations:

no

GLP compliance:

no

Parameter:

other: More sensitive to shock than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: More sensitive to friction than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: Explosive under influence of flame

Remarks on result:

not measured/tested

Parameter:

other: Explosive (not specified)

Remarks on result:

negative (not further specified)

 

 

Test method	Result		Remarks
	Onset of exotherm	Heat release
DTA (3 K/min, glass crucible)	330 °C	1500 J/g	Melting point at about 60 °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 2,3-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 (UN Test Series 2). 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 2,3-Dichloronitrobenzene which is slightly less energetic should not be an explosive either. 2,3-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Interpretation of results:

GHS criteria not met

Conclusions:

not explosive

Executive summary:

Heitkamp D and Keldenich H-P (Currenta), 2009

 

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 2,3-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 (CAS: 611 -06-3) has been tested extensively (UN Test Series 2). 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 2,3-Dichloronitrobenzene which is slightly less energetic should not be an explosive either. 2,3-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Reference 2

Endpoint:

explosiveness, other

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: UN F.3 Trauzl Test

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: UN A.1 BAM 50/60 steel tube test (instead of UN 1(a) UN gap test, since this method gives comparable results

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: only Thermal sensitivity (similar to UN 2(b) Koenen Test)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: UN 1 (c)(i) and UN 2 (c)(i) Time / pressure test

Deviations:

no

GLP compliance:

no

Parameter:

other: More sensitive to shock than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: More sensitive to friction than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: Explosive under influence of flame

Remarks on result:

negative (not further specified)

Parameter:

other: Explosive (not specified)

Remarks on result:

negative (not further specified)

I. Explosive power of the substance (UN F.3 Trauzl Test)

Under high confinement, 2,4 -Dichloronitrobenzene exhibits some explosive power. Since the result of the Trauzl test is "not low " in one run, tests UN 1 (a) and UN 2 (a) have to be performed, respectively.

 

Table I.1. Test details of UN F3 Trauzl Test

Test run	Sample mass	Cavity Before / after	Lead block expansion per 10 g	Result
1	10.0 g	63.4 ml / 89.5 ml	26.1 ml	"Not low"
2	10.0 g	64.3 ml / 94.5 ml	30.2 ml	"Not low"

 

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

2, 4-Dichloronitrobenzene is not able to propagate a detonation. The result of the UN A.1 corresponds to a ¿-¿ in the sense of the UN 1 (a) test.

From these findings it can be concluded that the outcome of the UN 2 (a) test would be ¿-¿ as well since in this

test the detonative initiation is attenuated by a PMME spacer. 2, 4-Dichloronitrobenzene is not sensitive to

detonative shock.

Table. II.1 Test details of the UN A.1 test

Test run	Sample	Observation	Result
1	1420.8 g 2, 4-Dichloronitrobenzene, solidified from melt Bulk density 1,45 kg/l	Tube fragmented at upper end; fragmented length: 192 mm Substance ejected completely	"No"
2	1406,6 g 2, 4-Dichloronitrobenzene, solidified from melt Bulk density 1,44 kg/33.2 g 4 -nitrotoluene, liquid Bulk density 1.15 kg/L	Tube fragmented at upper end; fragmented length: 194 mm Substance ejected completely	"No"

III. Behaviour when heated under defined confinement (EU A.14 (a) / UN 2 (b) Koenen test)

2, 4-Dichloronitrobenzene shows no violent effect on heating under confinement.(Limiting diameter < 2mm.)

Table III.1 Details of the test EU A.14

Amount of sample	Orifice diameter	TBB / TBE*)	Result
36.8 g	2 mm	54 s / 91 s	"O"
36.7 g	2 mm	51 s / 91 s	"O"
36.6 g	2 mm	53 s / 91 s	"O"
36.7 g	6 mm	54 s / 101 s	"O"
36.8 g	6 mm	55 s / 91 s	"O"
36.8 g	6 mm	50 s / 92 s	"O"

*) Time to beginning of reaction or burning / Time to end of burning
"O": tube unchanged

III. Effects of igniting the substance under confinement (UN 1 (c)(i) and UN 2 (c)(i))

Time-pressure-test

According to the criteria of UN test 1 (c) (i), 2,4-Dichloronitrobenzene shows no likelihood of deflagration.

Table IV.1. Details on Time/pressure test UN 1 (c)(i)

Test run	Sample amount	Maximum pressure	Time for pressure rise from 690 kPa to 2070 kPa	Result acc. to UN 1 (c)(i)	Result acc. to UN 2 (c)(i)	Remarks
1	5.0 g	906 kPa	--- ms	"-"	"-"	2070 kPa not reached
2	5.0 g	1250 kPa	--- ms	"-"	"-"	2070 kPa not reached
2	5.0 g	1340 kPa	--- ms	"-"	"-"	2070 kPa not reached

 

Conclusions:

2, 4-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives, and therefore should not be classified.

Executive summary:

Heitkamp D and Keldenich H-P (Currenta), 2009

2,4-dichloro-1-nitrobenzene (2, 4-Dichloronitrobenzene) does not show explosive properties as tested according to the UN test series 1 and 2

 

Conclusion for 2,3-Dichloronitrobenzene based on the read across with 2,4 -Dichloronitrobenzene

 

The structurally very 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 2, 3-Dichloronitrobenzene which is slightly less energetic should not

be an explosive either. 2, 3-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Description of key information

The structurally very 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 2, 3-Dichloronitrobenzene which is slightly less energetic should not be an explosive either. 2, 3-Dichloronitrobenzene is too insensitive for acceptance into the Class of Explosives.

Key value for chemical safety assessment

Explosiveness:

non explosive