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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 5 August 2014 to 13 August 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Principles of method if other than guideline:
The differential scanning calorimetry (DSC) allows to record the difference in heat flow of two crucibles, one filled with test substance and the other left empty as reference, while these crucibles are subjected to a controlled temperature programme. A transition of the test substance, such as melting or evaporation, is indicated by a deviation from the base line in the heat flow record. Because melting and evaporation are processes in which heat is consumed, the deviation from the base line is in the endothermic direction for these processes. The melting temperature or boiling temperature of the test substance is evaluated from the DSC curve as the extrapolated onset temperature of the endothermic melting or evaporation peak.
As a safety precaution for the DSC cell a preliminary test was performed using a thermogravimetric analyzer (TGA).
GLP compliance:
yes (incl. certificate)
Type of method:
thermal analysis
Remarks:
Differential Scanning Calorimetry (DSC)
Specific details on test material used for the study:
Commercial name: Dimetol (as reported in the report):
Chemical nature: 2,6-dimethylheptan-2-ol
Molecular weight: 144.2 g/mol
CAS number: 13254-34-7
Batch: PE00090447
Purity: 99.6 %
Expiry date: 28 May 2016
Key result
Melting / freezing pt.:
< -80 °C
Remarks on result:
other: The result refers to the freezing temperature. The test item showed no change in appearance during cooling.

In Experiment 1, 3 and 4, no effects were observed during cooling.

To further investigate the melting temperature of the test substance, two samples of the test substance were stored for 21 hours at -22.1 ± 0.2°C and -81.7 ± 1.8°C respectively. It was observed after storage that the test substance was a liquid (-20°C freezer) and a very viscous liquid (-80°C freezer). According to this it was concluded that the melting temperature of the test substance is < -80°C (< 193K).

Conclusions:
The freezing temperature of the test item has been determined to be less than -80°C (<193K)
Executive summary:

A study was conducted to determine the freezing point of Dimetol by applying a storage experiment in the freezer and by using a DSC analysis designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

It was observed that the test item was a very viscous liquid after storage at -80°C (freezer) and no effect was observed by DSC during cooling. Therefore, the freezing temperature of the test item has been determined to be less than -80°C (<193K); The atmospheric pressure was 1010 +/- 2hPa.

Description of key information

A study was conducted to determine the freezing point of Dimetol by applying a storage experiment in the freezer and by using a DSC analysis designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-80 °C

Additional information