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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-03-28 to 2018-06-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.14 (Explosive properties)
Deviations:
no
GLP compliance:
no
Key result
Test series:
other: Mechanical sensitivity (friction)
Method:
other: Mechanical sensitivity (friction)
Parameter:
limiting load (N)
Value:
360
Result:
negative, no explosion
Key result
Test series:
other: Mechanical sensitivity (friction)
Method:
other: Mechanical sensitivity (shock)
Parameter:
limiting impact energy (J)
Value:
40
Result:
negative, no explosion
Key result
Test series:
other: Thermal sensitivity
Method:
other: Thermal sensitivity
Parameter:
limiting diameter (mm)
Value:
2
Result:
negative, no explosion

Thermal stability

A first DSC-measurement in closed glass crucibles with the test item showed an endothermal effect in the temperature range of 255 - 280 °C and an exothermal effect in the temperature range of 280 - 420 °C with a maximum energy release of 740 J/g. A second DSC-measurement in closed high pressure crucibles with the test item showed an endothermal effect in the temperature range of 230 - 280 °C and an exothermal effect in the temperature range of 280 - 435 °C with an energy release of 712 J/g.

 

The heat of decomposition was above 500 J/g. Therefore the main test on explosive properties had to be performed.

 

Explosive properties

Mechanical sensitivity (friction):

Due to the waxy character of the test item sieving was waived and the test item was measured without any preliminary treatment. No explosion occurred within 6 tests using a pinload of 360 N, only a discoloration of the test item was observed in all tests.

 

Mechanical sensitivity (shock):

Due to the waxy character of the test item sieving was waived and the test item was measured without any preliminary treatment. 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. No explosion was observed. Table 2 gives the results of the thermal sensitivity.

 

Test
no.

Weight of
test item

(g)

Nozzle
width
(mm)

ti
(s)

t2
(s)

Reaction

Appearance;
Number of
fragments

1

44.7

2.0

40

>300

Flame

O

2

45.2

2.0

35

> 300

Flame

O

3

44.7

2.0

36

>300

Flame

O

time to any reaction, e.g. whistle or flame
t2: time to main reaction, e.g. rupture of tube or flashing
O: tube unchanged

 

 

The test on thermal sensitivity carried out with a nozzle with a diameter of 2.0 mm showed no explosion. Compared to the nozzle with a diameter of 6.0 mm the venting area of the nozzle with 2.0 mm is smaller by an order of magnitude. Additionally the physical state of the test item excludes the enrichment of high-energy components caused by evaporation of volatile solvents. Due to these facts an explosion with a nozzle width of 6.0 mm was excluded.

Interpretation of results:
GHS criteria not met
Conclusions:
The test item had no explosive properties.
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 above 500 J/g. Thus, the main test on explosive properties was necessary. Three test was conducted on mechanical sensitivity (friction), mechanical sensitivity (shock) and thermal sensitivity. The test item was found not be sensitive to mechanical friction or shock and was not thermal sensitive. Thus, it was concluded that the test item has no explosive properties in the sense of the method A.14.

Description of key information

The test item had no explosive properties (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 (reference 4.14-1). A screening test on thermal stability using differential scanning calorimetry (DSC) under nitrogen was performed. The test item and the reference substance 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 above 500 J/g. Thus, the main test on explosive properties was necessary. Three test was conducted on mechanical sensitivity (friction), mechanical sensitivity (shock) and thermal sensitivity. The test item was found not be sensitive to mechanical friction or shock and was not thermal sensitive. Thus, it was concluded that the test item has no explosive properties in the sense of the method A.14.

Justification for classification or non-classification

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

Based on the chemical structure and taking into account the provisions laid down in Regulation (EC) No 1272/2008, as amended for the tewlfth time in Regulation (EU) No 2019/521, the substance is not considered to be classified for explosive properties.