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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:
2012-07-18 to 2012-08-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
32 °C
Atm. press.:
1 013.25 hPa
Decomposition:
no
Sublimation:
no

Two DSC-measurements in aluminium crucibles with a hole showed an endothermic effect in the temperature range of 30 - 50 °C with an onset temperature of 31.7 °C to 31.9 °C. The onset temperatures are derived from the intersection of the tangent line with the highest slope of the endothermic peak with the baseline. The maximum test temperature was 150 °C and the test item appeared melted after the tests. Due to the results of the DSC-measurements it was concluded that the test item has a melting point of 32 °C.

Conclusions:
The melting point of the substance was determined to be 32 °C at 1013.25 hPa.
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 15 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a solid at ambient conditions. The test item was heated up from the starting temperature (0 °C) to the final temperature (150 °C) at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). Two DSC-measurements showed an endothermic effect in the temperature range of 30 - 50 ° with an onset temperature of 31.7 °C to 31.9 °C. Thus, the melting point of the test item was determined to be 32 °C at 1013.25 hPa.

Description of key information

The melting point of the substance was determined to be 32 °C at 1013.25 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
32 °C

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry (reference 4.2 -1). The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 15 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a solid at ambient conditions. The test item was heated up from the starting temperature (0 °C) to the final temperature (150 °C) at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). Two DSC-measurements showed an endothermic effect in the temperature range of 30 - 50 ° with an onset temperature of 31.7 °C to 31.9 °C. Thus, the melting point of the test item was determined to be 32 °C at 1013.25 hPa.