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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:
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)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= -60.09 - <= -43.87 °C
Remarks on result:
other: it is considered that the test was performed at atmospheric pressure

Freezing point = -60.09°C

Melting point = -43.87°C

It is believed that the temperature difference between the freezing point and the melting point is due to a supercooling process.

Supercooling is the process of cooling a liquid below its freezing point, without it becoming a solid. A liquid below its freezing point can crystallise in the presence of a seed crystal or a nucleus around which a crystal structure can form. Supercooling is increased when the rate of cooling and the sample mass are decreased. Supercooling increases as sample mass decreases due to the decrease of nuclei by decrease of sample mass.

Conclusions:
A differential scanning calorimetry was performed on the registered substance. It concluded that it has a freezing point = -60.09°C and a melting point = -43.87°C at 101.325 kPa.
Executive summary:

The melting point/freezing point of Decyltrimethoxysilane was determined by performing a differential scanning calorimetry in accordance with EU Method A.1. It concluded that the substance has a freezing point = -60.09°C and a melting point = -43.87°C at 101.325 kPa.

It is believed that the temperature difference between the freezing point and the melting point is due to supercooling.

Supercooling is the process of cooling a liquid below its freezing point, without it becoming a solid. A liquid below its freezing point can crystallise in the presence of a seed crystal or a nucleus around which a crystal structure can form. Supercooling is increased when the rate of cooling and the sample mass are decreased. Supercooling increases as sample mass decreases due to the decrease of nuclei by decrease of sample mass.

Description of key information

The melting point/freezing point of Decyltrimethoxysilane was determined by performing a differential scanning calorimetry in accordance with EU Method A.1. It concluded that the substance has a freezing point = -60.09°C and a melting point = -43.87°C at 101.325 kPa.

It is believed that the temperature difference between the freezing point and the melting point is due to supercooling.

Supercooling is the process of cooling a liquid below its freezing point, without it becoming a solid. A liquid below its freezing point can crystallise in the presence of a seed crystal or a nucleus around which a crystal structure can form. Supercooling is increased when the rate of cooling and the sample mass are decreased. Supercooling increases as sample mass decreases due to the decrease of nuclei by decrease of sample mass.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-43.87 °C

Additional information

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