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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:

experimental dates: 15-16 October 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method with no deviation, and under GLP. The substance is considered to be adequately characterised, with isomers composition. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

27 July 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

Commission Regulation No 440/2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed on 15 Nov. 2018

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Storage conditions of test material: Stored refrigerated (2-8°C) in aluminium bottle. An injection of nitrogen conditions gas is performed into the bottle after each sampling to keep the test item under nitrogen atmosphere during the storage period.

Key result

Melting / freezing pt.:

-111.6 °C

Pre-study

The melting point wasn’t observed during the pre-study.

First Determination

The cooling phase was also recorded. Freezing temperature was observed from ca -50°C to -108.4°C (endset temperature of the first peak).

During the heating phase, the melting point was detected on the thermogram as -111.6°C (onset temperature).

Second Determination

The cooling phase was also recorded. Freezing temperature was observed from ca -50°C to -106.5°C (endset temperature of the first peak).

During the heating phase, the melting point was detected on the thermogram as -111.7°C (onset temperature).

The melting point of the substance was determined as -111.6°C (mean of trials 1 and 2). It was found consistent with the end of freezing, at ca -107°C, therefore no high supercooling phenomenon is anticipated.

Executive summary:

The melting point of the test substance was determined under GLP according to OECD 102 / EU A1 guideline, using DSC method.

Two main runs were performed, and the mean final temperature was retained.

The melting temperature of test substance has been determined to be -111.6°C.

Description of key information

Experimental melting point (i.e. transition from solid to liquid) = -111.6°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-111.6 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available. It is considered as key study, and the result is retained as key data.