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Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 May 2017 - 19 October 2017

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:

May 31, 2008

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

July 27 1995

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

March 1998

GLP compliance:

yes

Type of method:

thermal analysis

Key result

Melting / freezing pt.:

< -80 °C

Atm. press.:

1 atm

Decomposition:

yes

Remarks:

An exothermic effect was observed starting at 250°C. The testitem changed form originally a colourless to light yellow vicous liquid to a brown molten residue aftre the test. These changes indicate reaction and/or decomposition of the test item.

Decomp. temp.:

>= 250 °C

Preliminary TGA

From 325°C upwards the weight of the sample decreased significantly. At 365°C, the sample weight had decreased by 25%. After the experiment, a brown residue remained in the sample container.

DSC Experiment

The DSC experiment did not show any endothermic or exothermic effect uring cooling.

An exothermic effect was observed starting at 250°C. The testitem changed from an originally colourless to light yellow vicous liquid to a brown molten residue aftet the test. These changes indicate reaction and/or decomposition of the test item.

Additional investigation

To investigate the melting temperature of the test item, two subsamples of the test item were placed in a freezer for 21 hours at -23.4 ± 0.6°C and at 82.1 ± 2.3°C respectively. It was observed after storage that the test item was a highly viscous liquid at both temperatures (≤ -15°C freezer and ≤ -80°C freezer). According to this, it was concluded that the melting temperature of the test item is ≤ -80°C.

Conclusions:

The DSC experiment did not show any endothermic or exothermic effect during cooling.
The melting temperature of the test item is determined to be ≤ -80°C as result of a freezer experiment.

Executive summary:

The study was performed in accordance with EC A.1, OECD 102 and EPA OPPTS 830.7200 and according to the principles of GLP.

Differential scanning calorimetry did not show any endothermic or exothermic effect during cooling.

Additional investigation, applying a freezer expiriment, was performed to determine the melting temperature of the tested substance. Two subsamples of the test item were placed in a freezer at -23.4 ± 0.6°C and at 82.1 ± 2.3°C respectively. It was observed after storage that the test item was still a highly viscous liquid at both temperatures. According to this, it was concluded that the melting temperature of the test item is ≤ -80°C.

Description of key information

The freezing point of the test item has been concluded to be < -80°C applying a storage experiment in the freezer.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-80 °C

Additional information

The study was performed in accordance with EC A.1, OECD 102, EPA and OPPTS 830.7200 guidelines and according to the principles of GLP.

The melting temperature is defined as the temperature at which the phase transition from solid to liquid state takes place at normal atmospheric pressure This temperature ideally corresponds to the solidification or freezing temperature.

The substance is a viscous liquid at roomtemperature and atmospheric pressure.

DSC experiment did not show any endothermic or exothermic effect during cooling

The melting temperature of the test item is determined to be ≤ -80°C as result of a additional freezer experiment.