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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019-09-25 to 2019-11-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.14 (Explosive properties)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD 113 Screening test for thermal stability and stability in the air
Deviations:
no
GLP compliance:
no
Key result
Parameter:
other: heat of decomposition [J/g]
Value:
571

Thermal stability


One DSC measurement in a closed glass crucibles showed an exothermal effect in the temperature range of 185 - 385 °C with an energy release of 571 J/g. A second DSC measurement in a closed gold crucible with the test item showed exothermal effects in the temperature range of 210 - 330 °C and in the temperature range of 335 - 400 °C. According to the specifications of the crucibles the measurement was determined at 400 °C. Due to the course of the base line it cannot be excluded that the exothermal effect would have continued above 400 °C. The measurement showed an energy release of > 309 J/g.


Table 1: Thermalstability (DSC measurements)






























Ident-No.



Weight / mg



Final temperature / °C



Temperature range / °C



Type of effect



Energy / J/g



38831



10.34



500



185 – 385



Exothermal



571



38846



6.93



400



210 – 330


335 - 400



Exothermal


Exothermal



50


> 259



With the DSC measurements it could not be excluded that the heat of decomposition was below 500 J/g. Therefore the main test on explosive properties had to be performed.


Mechanical sensitivity (shock)


No explosion within 6 tests using a mass of 10 kg falling from a height of 0.4 m was observed.


Thermal sensitivity


Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter and three tests were performed with a circular nozzle plate with a hole of 6 mm diameter. No explosion was observed.


Table 2: Thermal sensitivity





































































Test no.



Weight of test item / g



Nozzle width / mm



t1 / s



t2 / s



Reaction



Appearance; Number of fragments



1



39.6



2.0



48



> 300



Flame



о



2



39.6



2.0



47



> 300



Flame



о



3



39.6



2.0



47



> 300



Flame



о



4



39.6



6.0



44



> 300



Flame



о



5



39.6



6.0



45



> 300



Flame



о



6



39.6



6.0



45



> 300



Flame



о



t1: time to any reaction, e.g. whistle or flame


t2: time to main reaction, e.g. rupture of tube or flashing


о: tube unchanged

Interpretation of results:
GHS criteria not met
Conclusions:
The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.
Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 method A.14. to determine the explosive properties of the test item. A screening test on thermal stability using differential scanning calorimetry (DSC) under nitrogen was performed. The test item and the reference were heated up from ambient to the final temperature at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). Closed crucibles were used as containers for the test item and the reference. The quantity of heat absorbed or released was measured and recorded. The heat of decomposition was below 500 J/g (maximum overall energy release of 571 J/g). Therefore, the main test on explosive properties had to be performed. With regard to the mechanical sensitivity, no explosion was observed within 6 tests using a mass of 10 kg falling from a height of 0.4 m. In order to determine the thermal sensitivity, 3 tests each were carried out with a circular nozzle plate with a hole diameter of 2 and 6 mm. No explosion was observed. Thus, the test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Description of key information

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14. (reference 4.14-1).

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

A study was conducted according to Regulation (EC) No 440/2008 method A.14. to determine the explosive properties of the test item. A screening test on thermal stability using differential scanning calorimetry (DSC) under nitrogen was performed. The test item and the reference were heated up from ambient to the final temperature at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). Closed crucibles were used as containers for the test item and the reference. The quantity of heat absorbed or released was measured and recorded. The heat of decomposition was below 500 J/g (maximum overall energy release of 571 J/g). Therefore, the main test on explosive properties had to be performed. With regard to the mechanical sensitivity, no explosion was observed within 6 tests using a mass of 10 kg falling from a height of 0.4 m. In order to determine the thermal sensitivity, 3 tests each were carried out with a circular nozzle plate with a hole diameter of 2 and 6 mm. No explosion was observed. Thus, the test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14..

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008


Based on the structure of the molecule and taking into account the provisions laid down in Regulation (EC) No 1272/2008 (CLP), as amended for the seventeenth time in Regulation (EU) 2021/849, the test item does not have to be classified with respect to explosiveness.

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