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Diss Factsheets

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:
November 14, 2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
other: Method AB46-1215
Version / remarks:
“Determination of melting point, boiling point and enthalpy using Differential Scanning Calorimetry”
Qualifier:
equivalent or similar to guideline
Guideline:
other: ASTM E 537 – 07
Version / remarks:
“The thermal Stability Of Chemicals By Differential Scanning Calorimetry”
GLP compliance:
not specified
Type of method:
differential scanning calorimetry
Remarks:
on a Mettler DSC 1
Key result
Decomposition:
yes
Decomp. temp.:
250 °C
Sublimation:
no
Remarks on result:
other: atm. press.:- assumed to be standard atmosphere

Several phase transitions were detected for the test substance (solvent free). The first one at -10°C was likely a phase transition. The second peak at 170°C did not correspond to melting as judged by looking at the sample in the oven. The third major peak, at 250°C, was likely decomposition as the sample in oven at that temperature was turned completely black. The sample appeared not to have a distinct melting temperature as judged by DSC.

Conclusions:
Under the study conditions, the melting pont of the test substance could not be determined due to decomposition.
Executive summary:

A study was conducted to determine the melting point of the test substance, Oleyl TMAC (91.9% active), according to Method AB46-1215 and similar to ASTM E 537 – 07. The analysis was performed using the Differential Scanning Calorimetry on a Mettler DSC 1 under nitrogen atmosphere (20 mL/min). 14 mg of solid sample was placed in a 40 μL aluminium cup. The following temperature programming was used: -30-400ºC with a rate of 5 ºC/min. During the study, several phase transitions were detected for the test substance (solvent free). The first one at -10°C was likely a phase transition. The second peak at 170°C did not correspond to melting as judged by looking at the sample in the oven. The third major peak, at 250°C, was likely decomposition as the sample in oven at that temperature was turned completely black. The sample appeared not to have a distinct melting temperature as judged by DSC. Under the study conditions, the melting pont of the test substance could not be determined due to decomposition (Andersson, 2016).

Description of key information

The melting of the test substance was determined using the differential scanning calorimetry, according to Method AB46-1215 similar to ASTM E 537 – 07 (DSC) (Andersson, 2016).

Key value for chemical safety assessment

Additional information

Value used for CSA: no distinct melting temperature identified.

Several phase transitions were detected for the solvent free form of the test substance, Oleyl TMAC. The first one at -10°C was likely a phase transition. The second peak at 170°C did not correspond to melting as judged by looking at the sample in the oven. The third major peak, at 250°C, was likely decomposition as the sample in oven at that temperature was turned completely black. The sample appeared not to have a distinct melting temperature.