4-(Difluoro-(3,4,5-trifluoro-phenoxy)-methyl)-3,5-difluoro-benzaldehyde

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:

29.06-23.08.2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.14 (Explosive properties)

GLP compliance:

no

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

Key result

Parameter:

thermal sensitivity - Koenen test: limiting diameter (mm)

Remarks on result:

not thermal sensitive if heated under defined confinement

Thermal stability

One DSC measurement in a closed glass crucible with the test item showed an endothermal effect in the temperature range of 45 - 60 °C and two exothermal effects in the temperature range of 120 - 170 °C and 260 - 405 °C with an overall energy release of 710 J/g. The results are summarized in Table 1.

 

Table 1: Thermal stability (DSC measurements)

 

Ident-No.	Weigth/mg	Final temperature / °C	Temperature range / °C	Type of effect	Energy / J/g
36336	10.62	500	45 - 60  120 – 170 260 – 405	Endothermal Exothermal Exothermal	n.r. 185 525

n.r. = not relevant

 

The heat of decomposition was above 500 J/g. 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 to black 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 2 gives the results of the thermal sensitivity.

Table 2: Thermal sensitivity

Test no.	Weight of test item/g	Nozzle width/mm	t1 [s]	t2 [s]	Reaction	Appearance; number of fragments
1	26.4	2.0	50	>300	Flame	O
2	26.4	2.0	50	>300	Flame	O
3	26.4	2.0	49	>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:

The test item is not explosive.

Executive summary:

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.

Key value for chemical safety assessment

Explosiveness:

non explosive

Justification for classification or non-classification

Based on the result, the substance is not considered to be classified for explosiveness according to Classification, Labelling, and Packaging Regulation (EC) No 1272/2008.