Hydrogen bis[1-[(5-chloro-2-hydroxyphenyl)azo]-2-naphtholato(2-)]chromate(1-)

Explosiveness

Administrative data

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 Dec 2017 - 23 Feb 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: UN Manual of Tests and Criteria, Appendix 6 "Screening procedures" -Screening procedures for substances which may have explosive properties

Version / remarks:

Rev. 6 (2015)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Hydrogen bis[1-[(5-chloro-2-hydroxyphenyl)azo]-2-naphtholato(2-)]chromate(1-)

EC Number:

250-774-0

EC Name:

Hydrogen bis[1-[(5-chloro-2-hydroxyphenyl)azo]-2-naphtholato(2-)]chromate(1-)

Cas Number:

31714-55-3

Molecular formula:

C32H19Cl2CrN4O4

IUPAC Name:

[1-{[5-chloro-2-(hydroxy-kappaO)phenyl]diazenyl}-2-naphtholato(2-)-kappaO]{1-[(5-chloro-2-hydroxyphenyl)diazenyl]-2-naphtholato-kappaO}chromium

Test material form:

solid: particulate/powder

Details on test material:

- Appearance: Black powder
- Storage conditions: At room temperature

Specific details on test material used for the study:

The oxygen balance was calculated to be > -200 (i.e. -172).

Results and discussion

Small-scale preliminary tests

Small-scale preliminary tests 1

Key result

Parameter:

other: exothermic decomposition energy [J/g]

Value:

354.75

Small-scale preliminary tests 2

Key result

Parameter:

other: onset of the exothermic decomposition [°C]

Value:

367.3

Any other information on results incl. tables

- During the DSC measurement for the determination of the explosive properties a significant difference in the recorded signals was observed. Experiment 1 showed several exothermic signals, while Experiment 2 showed one exothermic signal. Hence, two additional measurements were carried out. Experiment 3 showed an exothermic signal with an endothermic effect superimposed. Experiment 4 showed one exothermic signal. After all DSC measurements it was observed that the DSC sample containers were expanded.

 

- It was considered that Experiment 2 and 4 showed the true exothermic signal of the decomposition of the test item. Signals in Experiment 1 and 3 were considered distorted by a mechanical shock caused by the expansion of the sample container. Therefore, the average exothermic decomposition energy was calculated based on Experiment 2 and 4.

- Results Experiment 2: 369.213°C; 377.62 J/g

- Results Experiment 4: 365.453°C; 331.87 J/g

 

Mean (n=2) exothermic decomposition energy: 354.75 J/g

Mean (n=2) onset temperature: 367.3°C

Applicant's summary and conclusion

Interpretation of results:

other: not classified under CLP or GHS

Conclusions:

The test item has no explosive properties, based on DSC experiments performed to evaluate the exothermic decomposition energy and onset of exothermic decomposition of the substance.

Executive summary:

The exothermic decomposition energy and onset of exothermic decomposition of the substance were determined by DSC in a GLP study, in accordance with the UN screening procedure. Exothermic decomposition of the test item was observed at a temperature of 367.3°C. The mean exothermic decomposition energy was 354.75 J/g. Since the criteria for acceptance of a substance for Class 1 explosives were not fulfilled, it was concluded that the test item has no explosive properties.