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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:
2018-05-04 - 2018-11-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
31 May 2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
-57.23 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: no atm. pressure stated in the study report

At the pre-Test it was determined, that the melting point was between -20.3 and -80 °C.

First Determination: A melting point of -57.08 °C was detected.

Second Determination: A melting point of -57.37 °C was detected.

As the deviation between the two evaluated determinations was less than 0.5 K the result can be considered valid.

The melting point of the substance is stated as mean value of both determinations: -57.23 °C.

Conclusions:
The melting point was determined as the endothermic event with -57.23 ± 0.21 °C (215.93 ± 0.21 K)
Executive summary:

Determination of the melting point of the test substance was determined via DSC (differential scanning calorimetry) according to GLP, OECD 102 and EU method A.1.

Based on results obtained in the pre-test the melting point should be between -20 °C and -80 °C. In two DSC measurements an endothermic event during the heating up phase was detected. The endothermic event can be identified as melting point (evaluated with the onset function).

The melting point was determined as the endothermic event with -57.23 ± 0.21 °C (215.93 ± 0.21 K).

This value represents the mean of two independent determinations.

Description of key information

Determination of the melting point of the test substance was determined via DSC (differential scanning calorimetry) according to GLP, OECD 102 and EU method A.1.

Based on results obtained in the pre-test the melting point should be between -20 °C and -80 °C. In two DSC measurements an endothermic event during the heating up phase was detected. The endothermic event can be identified as melting point (evaluated with the onset function).

The melting point was determined as the endothermic event with -57.23 ± 0.21 °C (215.93 ± 0.21 K).

This value represents the mean of two independent determinations.

Melting point / freezing point of hexanal was described in several handbooks. Described properties are nearly the same: The melting point of hexanal is about -56 °. This information is supported by calculation (-55.13 °C). All supporting values are in range with the experimental result.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-57.23 °C

Additional information

No atmospheric pressure was stated in the study report, but for melting point detection this is not of relevance for the result. Therefore assuming the standard atm. pressure is applicable for the CSA.

Literature/Calculation-data:

CRC Handbook:

The melting point of hexanal is -56 °C.

Sax Dang. Prop.:

The melting point of hexanal is -56.3 °C.

EPI Suite:

Melting point of hexanal was calculated to be -55.13 °C as mean of the calculated results of the adapted Joback method (-76.78 °C) and the Gold and Ogle Method (-36.47 °C).