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Physical & Chemical properties

Explosiveness

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Administrative data

Endpoint:
explosiveness
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study

Data source

Referenceopen allclose all

Reference Type:
study report
Title:
Unnamed
Year:
2009
Report date:
2009
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report date:
2009

Materials and methods

Test guidelineopen allclose all
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:
EU Method A.14 (Explosive properties)
Version / remarks:
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

Test material

Constituent 1
Chemical structure
Reference substance name:
4-nitrotoluene
EC Number:
202-808-0
EC Name:
4-nitrotoluene
Cas Number:
99-99-0
Molecular formula:
C7H7NO2
IUPAC Name:
1-methyl-4-nitrobenzene
Details on test material:
- Name of test material (as cited in study report): p-Nitrotoluene
- Analytical purity: 99.8 % ( EC A.14, Time-Pressure-Test, Trauzl Test), 99.7 % (Propagation of detonation)

Results and discussion

Small-scale preliminary testsopen allclose all
Parameter:
other: More sensitive to shock than m-dinitrobenzene
Remarks:
migrated information
Remarks on result:
not measured/tested
Parameter:
other: More sensitive to friction than m-dinitrobenzene
Remarks:
migrated information
Remarks on result:
not measured/tested
Parameter:
other: Explosive under influence of flame
Remarks:
migrated information
Remarks on result:
negative (not further specified)
Parameter:
other: Explosive (not specified)
Remarks:
migrated information
Remarks on result:
negative (not further specified)

Any other information on results incl. tables

Summary of UN Test Series 2:

 

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

 

 

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

Under high confinement, 4-nitrotoluene has no or low explosive power. Since the result of the Trauzl test is "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

65.3 ml / 72.3 ml

7.0 ml

"No"

2

10.0 g

64.6 ml / 76.0 ml

11.4 ml

"Low"

 

 

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

4 -nitrotoluene is not able to propagate a detonation. The result of the UN A.1 "Partial" 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. 4 -nitrotoluene is not sensitve to detonative shock.

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

Test run

Sample

Observation

Result

1

1129.4 g 4 -nitrotoluene, liquid

Bulk density 1.15 kg/L

Tube fragmented at upper end; fragmented length: 192 mm

Substance ejected completely

"Partial"

2

1133.2 g 4 -nitrotoluene, liquid

Bulk density 1.15 kg/L

Tube fragmented at upper end; fragmented length: 194 mm

Substance ejected completely

"Partial"

 

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

4 -nitrotoluene 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

26.6 g

2 mm

48 s / 91 s

"O"

26.6 g

2 mm

47 s / 91 s

"O"

26.6 g

2 mm

47 s / 91 s

"O"

26.6 g

6 mm

46 s / 101 s

"O"

26.6 g

6 mm

48 s / 91 s

"O"

26.6 g

6 mm

48 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))

According to the criteria of UN test 1 (c)(i), 4 -nitrotoluene 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

1094 kPa

--- ms

"-"

"-"

2070 kPa not reached

2

5.0 g

1063 kPa

--- ms

"-"

"-"

2070 kPa not reached

2

5.0 g

1156 kPa

--- ms

"-"

"-"

2070 kPa not reached

 

Applicant's summary and conclusion

Executive summary:

Heitkamp D and Keldenich H-P (Currenta), 2009 [study report 2009/01372e and 2009/01684e for 4-nitrotoluene]

The acceptance procedure for explosives as in section 10.3 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria as been performed for 4-nitrotoluene. Since the result of the Trauzl test (UN F.3) was "Low" (explosive power) in one run, test UN 1 (a) and 2 (a) had to be performed. For practical purposes, the BAM 50/60 steel tube test (UN A.1) was performed instead of the UN 1 (a) test since this method gives comparable results. The results of 2 runs were "Partial", which corresponds to "-" in the sense of UN 1 (a) test. 4-nitrotoluene is not able to propagate a detonation. From these findings it can be concluded the outcome of UN 2 (a) test to be "-" as well. 4-nitrotolene is not sensitve to detonative shock.

In the Koenen test (UN 2 (b)) 4-nitrotoluene showed no violent effect on heating under confinement (limiting diameter < 2 mm).

In the time / pressure test (UN 1 (c)(i) and UN 2 (c)(i) 4-nitrotoluene showed no likelihood of deflagration (maximum pressure reached 1156 kPa). Since the three tests of test series 2 were negative, the summary is: 4-nitrotoluene is too insensitive for acceptance into the Class of Explosives, and therefore should not be classified.

Conclusion for 3-Nitrotoluene based on the read across with 4-Nitrotoluene:

In report 2009/01372, the explosive properties of the closely related p-Nitrotoluene have been determined by comprehensive testing. This compound was found to be not explosive. In analogy, it is concluded that m- Nitrotoluene is also insensitive for acceptance into the Class of Explosives and has no explosive properties either. Therefore m- Nitrotoluene should not be classified as explosive.

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