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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:
25 October to 15 November 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Qualifier:
according to
Guideline:
other: CIPAC MT 1 (2009): Freezing Point
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
-69.5 °C
Atm. press.:
>= 1 007 - <= 1 015 hPa
Decomposition:
no

Results

In the temperature range of -70 to -40 °C, a very small endothermic effect (melting) was observed. Between approx. 110 - 230 °C a second endothermic effect (boiling) was observed. No further thermal effects were observed up to the test end temperature of 500 °C.

 

Results of the DSC-measurements

No.

Sample weight / mg

Onset of Effect / °C

Range of

effect / °C

Weight loss / mg

Atmospheric pressure / hPa

PN12107

15.33

-69.51

212.11

-70 to -40 (endo)

110 - 230 (endo)

15.33

1007.3

PN12122

14.91

-69.50

212.10

-70 to -40 (endo)

120 - 230 (endo)

14.86

1015.2

 

During the cooling phase, no thermal effects were observed in the temperature range from -100 to 25 °C.

During the subsequent heating phase the test item showed a very small endothermic effect in the temperature range of -70 to -40 °C, which can be assigned with the melting of the test item. As the onset temperatures in both tests deviate by less than 0.5 K from their mean value of -69.51 °C, the test item has a melting point of -69.5 °C.

Due to the very small melting peak, the melting of the test item was verified. 3.0 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -75 °C. In the temperature range of approx. -75 to -60 °C the test item was solid. The appearance of the test item during warming up: at approx. -50 °C very viscous, at -40 °C liquid. Therefore the melting point in the DSC-measurement was confirmed.

The test item showed a second endothermic signal in the temperature range of approx. 110 - 230 °C that can be assigned to the boiling of the test item.

 

Final Results

The test item has a melting point of -69.5 °C at atmospheric pressure (1007 hPa and 1015 hPa, respectively) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Conclusions:
A melting point value of -69.5 °C (at 1007 hPa and 1015 hPa) was determined for the test substance according to E.U. Method A.1.

Description of key information

Melting point: -69.5 °C at 1007 hPa and 1015 hPa (EU Method A.1, differential scanning calorimetry)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-69.5 °C

Additional information