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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Remarks:
DSC (main test), thermogravimetric analysis (TGA), visual inspection by capillary method
Melting / freezing pt.:
>= -42.5 - <= 50.2 °C
Atm. press.:
1 010 hPa
Decomposition:
yes

In the TGA test, a sample of the test item was heated from 30 °C to 455 °C in an inert gas atmosphere (N2). Between 30 °C and 85 °C it lost 0.6 % of its weight, which can be mainly attributed to the partial evaporation of residual iso-propanol and water.

Above 179 °C (onset) the weight continuously decreased and reached a loss of approx. 99.5 % at 360 °C.

Even in the preliminary DSC test an endothermic signal was recorded above 179 °C (178.9 °C (onset) and 231.8 °C (endset)). Thus, with the recorded weight loss this effect could be allocated to a boiling behaviour, however, from the knowledge of the chemical structures this endotherm is most likely allocated to a degradation process.

During the first heating period of the main DSC test, an endothermic signal was recorded over a temperature range of - 27.8 °C … 60.7 °C, which can be attributed to the melting procedure as in the DSC main tests corresponding comparable exothermic signals were recorded.

The broad temperature range at which the melting process was detected can be explained by the broad chain length variety of the alkyl moieties. Thus, a defined melting point is not assessable, a melting range is reported instead.

As an average, a melting range of - 42.5 °C to 50.2 °C was measured by DSC which is lower as the clear point of 80 °C recorded at the visual observation, however, this may be falsified by the occurring gas bubbles.

Conclusions:
The melting range of Di-C12-18 alkyldimethyl ammonium chloride was determined to be -42. 5 °C - 50.2 °C (at 1010 hPa).
Executive summary:

The melting point of Di-C12-18 alkyldimethyl ammonium chloride was determined according to OECD Guideline 102 and EU method A.1 by differential scanning calorimetry and visual methods.

As an average, a melting range of - 42.5 °C to 50.2 °C at 1010 hPa was measured by DSC which is lower as the clear point of 80 °C recorded at the visual observation, however, this may be falsified by the occurring gas bubbles.

Description of key information

- 42.5 °C to 50.2 °C at 1010 hPa (OECD TG 102/ EU method A.1; non-GLP, RL1)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
50.2 °C

Additional information

The melting point of Di-C12-18 alkyldimethyl ammonium chloride was determined according to OECD Guideline 102 and EU method A.1 by differential scanning calorimetry and visual methods.

As an average, a melting range of - 42.5 °C to 50.2 °C at 1010 hPa was measured by DSC which is lower as the clear point of 80 °C recorded at the visual observation, however, this may be falsified by the occurring gas bubbles.