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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:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
other: Innospec SOP TM005 Revision: 1; "Melting Point and Boiling Point by DSC"
Principles of method if other than guideline:
The study was conducted in accordance with Innospec SOP TM005 Revision: 1; "Melting Point and Boiling Point by DSC"
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
The commercial product containing the "substance", Quaternary ammonium compounds, di-C12-18-alkyldimethyl, nitrites, CAS Number 71487-01-9, EC Number 275 -532 -1, in organic solvents, methanol and isopropanol (ca. 32%) was utlised for this study. Prior to this study being undertaken, these solvents were removed by, firstly, leaving the sample under a stream of nitrogen to remove the majority of the solvent(s) and, secondly, evaporating the remaining residual solvent(s) under vacuum at 60 degress C to constant dried weight of the test item. After solvent removal the substance was identified to be a yellow viscous liquid / wax like solid.
Key result
Decomposition:
ambiguous
Remarks on result:
not determinable
Remarks:
A phase change for the Test Item was observed to occur from -11.2 degrees C to -20.8 degrees C, however given the nature of the Test Item, it is not possible to say that is definitely a freezing point event
Conclusions:
A phase change for the Test Item was observed to occur from -11.2 degrees C to -20.8 degrees C, however given the nature of the Test Item, it is not possible to say that this is definitely a freezing point event
Executive summary:

The melting point/freezing point of the test item (Quaternary ammonium compounds, di-C12-18-alkyldimethyl, nitrites, CAS Number 71487-01-9, EC Number 275-532-1) was investigated in a study performed in accordance with Innospec SOP TM005 Revision: 1; "Melting Point and Boiling Point by DSC".

This study is assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al (1997).

Differential Scanning Calorimetry (DSC) monitors the amount of energy input required to maintain a Test Item and reference material at the same temperature when undergoing a controlled temperature programme. When the sample undergoes a phase change the corresponding change in enthalpy gives a departure from the baseline of the heat flow record. It is possible to determine a freezing point range by analysing the cooling curve.

A phase change for the Test Item was observed to occur between -11.2 degrees C to -20.8 degrees C. However given the nature of the Test Item, it is not possible to say that this is definitely a freezing point event.

Description of key information

The melting point/freezing point of the test item (Quaternary ammonium compounds, di-C12-18-alkyldimethyl, nitrites, CAS Number 71487-01-9, EC Number 275-532-1) was investigated in a study performed in accordance with Innospec SOP TM005 Revision: 1; "Melting Point and Boiling Point by DSC".

This study is assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al (1997).

Differential Scanning Calorimetry (DSC) monitors the amount of energy input required to maintain a Test Item and reference material at the same temperature when undergoing a controlled temperature programme. When the sample undergoes a phase change the corresponding change in enthalpy gives a departure from the baseline of the heat flow record. It is possible to determine a freezing point range by analysing the cooling curve.

A phase change for the Test Item was observed to occur between -11.2 degrees C to -20.8 degrees C. However given the nature of the Test Item, it is not possible to say that this is definitely a freezing point event.

Key value for chemical safety assessment

Additional information

A phase change for the Test Item was observed to occur between -11.2 degrees C to -20.8 degrees C. However given the nature of the Test Item, it is not possible to say that this is definitely a freezing point event.

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