diethyl 1-(2,4-dichlorophenyl)-5-methyl-4,5-dihydro-1H-pyrazole-3,5-dicarboxylate

Explosiveness

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04.11.1994

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

Parameter:

other: Thermal sensitivity

Remarks on result:

negative (not further specified)

Parameter:

sensitiveness to impact: impact energy (J)

Remarks on result:

negative (not further specified)

Parameter:

sensitiveness to friction: friction load (N)

Remarks on result:

not measured/tested

Remarks:

substance was a liquid

Thermal sensitivity:

There were no explosions observed in any of the three tests in serial 1 and 2. There were no visible damages at the test tubes. In all cases the test substance burned down after a period of approx. 1 minute.

It could be reported that there was no explosive property of the test substance, induced by flame.

Mechanical sensitivity (Shock):

None of the six single tests showed any sparking or exploding.

It could be reported that there was no explosive property of the test substance, induced by shock.

The results and observations of the tests verified that the test substance had no explosive properties at all.

Thermal sensitivity (Friction)

Test is not required --> test substance is a liquid.

Interpretation of results:

GHS criteria not met

Reference 2

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22.05.2015 - 01.07.2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.14 (Explosive properties)

Qualifier:

according to guideline

Guideline:

other: OECD 113 Screening test for thermal stability and stability in air

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.6316 (Explodability)

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Mainzer Straße 80, D65189, Wiesbaden

Parameter:

sensitiveness to friction: friction load (N)

Remarks on result:

not sensitive to friction using a friction load of 360 N

Parameter:

sensitiveness to impact: impact energy (J)

Remarks on result:

not sensitive to impact using an impact energy of 40 J

Parameter:

other: thermal sensitivity

Remarks on result:

not thermal sensitive if heated under defined confinement

Individual results

The test item was a solidified melt. Therefore it was ground with a mortar before the measurements.

Thermal stability

The DSC-measurement in a closed glass crucible in a closed high pressure crucible showed an endothermal effect in the temperature range of 40 - 80 °C and an exothermal effect in the temperature range of 245 - 465 °C with an energy release of 913 J/g. No further endothermal or exothermal effects were observed up to the final temperature of 500 °C.

The DSC-measurement in a closed glass crucible showed an endothermal effect in the temperature range of 40 - 70 °C and an exothermal effect in the temperature range of 240 - 460 °C with an energy release of 848 J/g. No further endothermal or exothermal effects were observed up to the final temperature of 500 °C.

An optical inspection showed a black residue after the measurements.

Thermal stability (DSC measurement)

Ident- No.	Weight /mg	Final temperature / °C	Type of effect	Temperature range / °C	Enthalpy / J/g	Enthalpy / J/g
35059	11.28	500	Endothermal exothermal	40-80 245 - 465	not relevant, -913	closed glass crucible in closed high pressure crucible
35065	12.32	500	Endothermal Exothermal	40-70 240 - 460	not relevant, -848	closed glass crucible

Explosive properties

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 < 0.5 mm. No explosion occurred within 6 tests using a pinload of 360 N, only a discoloration of the test item was observed.

Mechanical sensitivity (shock):

The test item was sieved. The fraction between 1 mm and 0.5 mm was used for the test. 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 with a nozzle palte with a hole of 6 mm.

The following table gives the results of the thermal stability.

Test no.	Weight of test item (g)	Nozzle width (mm)	t1 (s)	t2 (s)	Reaction	Appearance Number of Fragments
1	23.7	2.0	65	>300	Flame	O
2	23.7	2.0	67	>300	Flame	O
3	23.7	2.0	65	>300	Flame	O
4	23.7	6.0	70	>300	Flame	O
5	23.7	6.0	69	>300	Flame	O
6	23.7	6.0	69	>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 tests on thermal sensitivity carried out with a nozzle with a diameter of 2.0 mm and 6.0 mm, respectively, showed no explosion.

Description of key information

No explosive properties (EU Method A.14 / OECD 113)

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

The results and observations of the tests carried out verify that the substance has no explosive properties at all.

Justification for classification or non-classification

The available data on explosive properties of the test substance do not meet the criteria for classification according to Regulation (EC) 1272/2008, and therefore is conclusive but not sufficient for classification: Based on results and observations of the tests the substance is not explosive.