trans-2-(4-Bromo-3-fluorophenyl)-5-butyl-[1,3]dioxane

Explosiveness

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 2018-10-24 to 2019-01-28

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:

no

Key result

Parameter:

thermal sensitivity - Koenen test: diameter of the orifice plate

Value:

2

Number of fragments:

0

Remarks on result:

not thermal sensitive if heated under defined confinement

Key result

Parameter:

sensitiveness to friction: friction load (N)

Remarks on result:

not sensitive to friction using a friction load of 360 N

Key result

Parameter:

sensitiveness to impact: impact energy (J)

Remarks on result:

not sensitive to impact using an impact energy of 40 J

In a DSC measurement the heat of decomposition of the test item was determined to be above 500 J/g in a closed high pressure crucible. Therefore, the main test on explosive properties had to be performed.

Mechanical sensitivity (friction):

The test item was sieved (mesh size 0.5 mm) before the measurement. 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):

The test item was sieved (mesh size 0.5 mm) before the measurement. 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 1. Thermal sensitivity

Test no.	Weight of test item (g)	Nozzle width (mm)	t1 (s)	t2 (s)	Reaction	Appearance; Number of fragments
1	24.6	2.0	70	>300	Flame	O
2	24.6	2.0	69	>300	Flame	O
3	24.6	2.0	70	>300	Flame	O

t1: 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:

It was determined that the test item has no explosive properties.

Executive summary:

A study according to Regulation (EC) 440/2008 Method A.14 was performed to determine the explosive properties of the test item. The test item was tested for mechanical sensitivity (shock), mechanical sensitivity (friction) and thermal sensitivity. For the mechanical sensitivity (shock) the test item was subjected to the shock of a falling hammer on a steel anvil from a specified height with a specified weight and for the mechanical sensitivity (friction) the test item was subjected to friction between standard surfaces under specified conditions of load and relative motion. For the thermal sensitivity the test item was heated in a steel tube, with various degrees of confinement being provided by nozzle-plates with different diameters (2 mm and 6 mm) of orifice, to determine whether the substance is liable to explode under conditions of thermal stress and confinement. The test item was found to have no explosive properties. 

Description of key information

It was determined that the test item has no explosive properties.

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

A study according to Regulation (EC) 440/2008 Method A.14 was performed to determine the explosive properties of the test item (reference 4.14-1). The test item was tested for mechanical sensitivity (shock), mechanical sensitivity (friction) and thermal sensitivity. For the mechanical sensitivity (shock) the test item was subjected to the shock of a falling hammer on a steel anvil from a specified height with a specified weight and for the mechanical sensitivity (friction) the test item was subjected to friction between standard surfaces under specified conditions of load and relative motion. For the thermal sensitivity the test item was heated in a steel tube, with various degrees of confinement being provided by nozzle-plates with different diameters (2 mm and 6 mm) of orifice, to determine whether the substance is liable to explode under conditions of thermal stress and confinement. The test item was found to have no explosive properties. 

Justification for classification or non-classification

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

In accordance with Annex I, Section 2.1 of Regulation (EC) No 1272/2008, as amended for the tenth time in Regulation (EC) No 2017/776, and UN GHS Rev 6 (2015) the substance is not considered to be classified as explosive in class 1.