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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:
17 August 2017 - TBC
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Regulation (EC) 440/2008 of 30 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
27 July 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
86 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: Mean Value
Remarks:
Value derived from the result of Test 1 and Test 2
Melting / freezing pt.:
86.2 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: Test 1
Melting / freezing pt.:
85.7 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: Test 2

Evaluation of Data:

The melting/freezing point is defined as the point at which phase transition from solid to liquid state (or vice versa) at normal atmospheric pressure takes place. As the phase transition of many substances takes place over a large temperature range, it is often described as a melting/freezing range. During thermal analysis, the peak width of an endothermic reaction also depends on sample amount and heating rate. Therefore, the onset point of the relevant endothermic peak is usually stated as the freezing/melting point. If the endothermic peak/s is poorly defined, a range may be stated. Measured temperatures were converted from °C to K using Equation 1.

 

Equation 1:                                                                            T = t + 273.15

 

where:

T = Thermodynamic temperature, Kelvin (K)

t = Celsius temperature, degrees Celsius (°C)

 

 

Results:

Table 2:          Thermographic Data

Thermal Event

Interpretation

Temperature

Preliminary Test, Screen 1

Main Test, Determination 1

Main Test, Determination 2

°C

K

°C

K

°C

K

Endotherm (onset)

Start of melting

86.4

359.6

86.2

359.4

85.7

358.9

The residue in the crucibles from determinations 1 and 2 was observed to be a white solid around the periphery.

 

Mean melting point (Determinations 1 and 2): 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K)

 

Conclusion:

The melting point of the test item has been determined to be 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K).

Conclusions:
The melting point of the test item has been determined to be 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K).
Executive summary:

EU Method A.1. – The melting point/freezing point of the test item was determined using the Differential Scanning Calorimeter (DSC) method.  The procedure employed was designed to be compatible with Method A.1. Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Aliquots of test item (0.0043 – 0.0055 g) were placed in a crucible and subjected to heating at a rate of 1 °C/min from 20 to 120 °C.  Heating was continued until melting of the sample was observed.  The main test was performed two times.

The mean melting temperature of the test item was determined to be 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K).

Description of key information

Melting Point: 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K); EU Method A.1.; R. Butler (2018)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
86 °C

Additional information

EU Method A.1. – The melting point/freezing point of the test item was determined using the Differential Scanning Calorimeter (DSC) method.  The procedure employed was designed to be compatible with Method A.1. Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Aliquots of test item (0.0043 – 0.0055 g) were placed in a crucible and subjected to heating at a rate of 1 °C/min from 20 to 120 °C.  Heating was continued until melting of the sample was observed.  The main test was performed two times.

The mean melting temperature of the test item was determined to be 86.0 °C ± 0.5 °C (359.15 K ± 0.5 K).