Tetrakis(pentane-2,4-dionato-O,O')zirconium

Flash point

Administrative data

Endpoint:

flash point of flammable liquids

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the flash point is only relevant to liquids and low melting point solids

Justification for type of information:

The melting point of the substance was determined to be 196.4°C, thus the substance is not a 'low melting point solid'.

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Jan - March 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

196.4 °C

Decomposition:

yes

Decomp. temp.:

ca. 200 °C

Remarks on result:

other: reaction and/or decomposition of the test item during and directly after melting

Two experiments were performed to investigate the melting (and boiling) behaviour of the substance.

DSC EXPERIMENT 1

An endothermic peak was observed between 175°C and 200°C directly followed by another small endothermic and an exothermic effect (see the illustration below). The extrapolated onset temperature of the first effect was 196.567°C. The endothermic effect was most likely caused by melting of the test item. The second endothermic effect and the exothermic effect were probably caused by reaction and/or decomposition of the test item.

After the experiment, a dark brown molten residue remained in the sample container (original colour: white to off-white). The change of the colour indicated reaction and/or decomposition of the test item.

DSC EXPERIMENT 2

In order to investigate the melting peak, in Experiment 2 heating was stopped directly after the melting effect. The extrapolated onset temperature was 196.218°C. After the experiment, a yellow molten residue remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test item. It was therefore concluded that melting was the reason for the endothermic effect and that the test item had reacted and/or decomposed during and directly after melting.

DATA HANDLING

The melting temperature was determined as the mean melting temperature of Experiment 1 and Experiment 2.

Conclusions:

The melting temperature of the substance was determined to be 196.4°C.