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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:
03-May-2015 to 28-May-2015
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
thermal analysis
Remarks:
Differential Scanning Calorimetry
Decomp. temp.:
ca. 10 °C
Remarks on result:
other: Melting point of the main phase detected at approx. 10 °C; melting point of the minor phase detected at approx. 6 °C. The atmospheric pressure is assumed to be normal.

Results

The cooling curve exhibits a broad, not very sharp exothermic crystallization peak with multiple maxima between -3 and -10 °C.

 

Upon heating the heat flow curve shows an endothermic double-phase melting peak.

Minor part: 6 °C (extrapolated onset temperature); 8 °C (maximum temperature)

Major part: 10 °C (extrapolated onset temperature); 15/16 °C (maximum temperature)

 

It is to be noted that crystallization processes are often impaired by supercooling, due to a kinetic delay of the transformation caused by inhibited nucleation. Thus the measured transformation temperature does not necessarily correspond to the thermodynamic equilibrium temperature, but is strongly dependent on the thermal history of the sample and the applied cooling rate. Therefore cooling and heating cycle yield different enthalpy profiles.

 

Conclusions

No standard melting point was found.

The melting point of the main phase is detected at approx. 10 °C.

The melting point of the minor phase is detected at approx. 6 °C.

 

 

Conclusions:
A melting point value of approximately 10 °C at 1013 hPa was determined in a reliable study conducted according to an appropriate test protocol. It was not compliant with GLP.

Description of key information

Trichloro(octadecyl)silane: approximately 10°C at 1013 hPa (measured)

Key value for chemical safety assessment

Additional information

A melting point value of approximately 10°C at 1013 hPa was determined by DSC method according to OECD Guideline 102.