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Link to relevant study record(s)

Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From April 11, 2006 to June 27, 2006
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
GLP compliance:
yes (incl. QA statement)
Parameter:
thermal sensitivity - Koenen test: limiting diameter (mm)
Remarks on result:
not thermal sensitive if heated under defined confinement
Remarks:
The test on thermal sensitivity carried out with a nozzle with a diameter of 2.0 mm showed no explosion.

The heat of decomposition in the screening test was above 500 J/g. Therefore the main test on explosion properties was performed.

 

Mechanical sensitivity (friction):

No explosion was observed within 6 tests using a pinload with 360 N.

 

Mechanical Sensitivity(Shock):

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

 

Thermal sensitivity:

Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter.

 

Test Number

Weight of test item (g)

Nozzle width (mm)

T1 (Seconds)

T2 (Seconds)

Reaction

Appearance; Number of Fragments

1

21.4

2.0

23.2

>300

Flame

0

2

21.2

2.0

21.3

>300

Flame

0

3

21.2

2.0

20.6

>300

Flame

0

 

T1: time to any reaction, e.g. whistle or flame

T2: time to main reaction, e.g. rupture of tube or flashing

 

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 is excluded.

Interpretation of results:
GHS criteria not met
Conclusions:
Under the study conditions, the test substance was found to be non-explosive.
Executive summary:

A study was conducted to determine the explosiveness of the test substance according to the EU Method A.14, in compliance with GLP. As a screening method for the determination of explosive properties, a differential scanning calorimetry (DSC) under nitrogen was performed.

The heat of decomposition was above 500 J/g. Therefore the main test for explosive properties was performed. For mechanical sensitivity (friction), 6 tests were performed, using a pinload with 360 N. For mechanical sensitivity (shock), 6 tests were performed, using a mass of 10 kg falling from a height of 0.4 m. For thermal sensitivity, three tests were performed with a circular nozzle plate with a hole of 2 mm diameter. 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 substance (pure solid) and the chemical structure 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.

Under the study conditions, the test substance was found to be non-explosive.

Description of key information

The test substance is non-explosive (Smeykal, 2006).

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification