2-Propenoic acid, 2-[[1,1,2-trifluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)ethyl]thio]ethyl ester

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:

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.