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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Principles of method if other than guideline:
DSC method
GLP compliance:
yes
Type of method:
method to determine freezing temperature
Melting / freezing pt.:
-73 °C
Atm. press.:
1 013 hPa
Decomposition:
no
Sublimation:
no
Remarks on result:
other: given is the glass transition temperature since no freezing point is evident within the instruments detection limit, -90°C.
Conclusions:
There was no freezing point evident on the cooling curve or melting point evident on the heating curve. The absence of a freezing or melting point could be attributed to a freeze point below -90°C, the instrument’s lower detection limit, or the sample maybe amorphous whereby the viscosity increases slowly but the material does not crystallize. There was a glass transition evident with an onset of -72.93°C indicating that the material is amorphous and turns to a glass on freezing rather than crystallizing.
Executive summary:

There was no freezing point evident on the cooling curve or melting point evident on the heating curve. The absence of a freezing or melting point could be attributed to a freeze point below -90°C, the instrument’s lower detection limit, or the sample maybe amorphous whereby the viscosity increases slowly but the material does not crystallize. There was a glass transition evident with an onset of -72.93°C indicating that the material is amorphous and turns to a glass on freezing rather than crystallizing.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: manufacturer data without proof
Principles of method if other than guideline:
method not reported
GLP compliance:
not specified
Type of method:
pour point
Melting / freezing pt.:
-25 °C
Decomposition:
no
Conclusions:
The pour point of the substance is reported to be -25°C.

Description of key information

The pour point of the substance is reported to be -25°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-25 °C

Additional information

Additional data are available for the source substance: 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8)

There was no freezing point evident on the cooling curve or melting point evident on the heating curve. The absence of a freezing or melting point could be attributed to a freeze point below -90°C, the instrument’s lower detection limit, or the sample maybe amorphous whereby the viscosity increases slowly but the material does not crystallize. There was a glass transition evident with an onset of -72.93°C indicating that the material is amorphous and turns to a glass on freezing rather than crystallizing.