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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:
21 Mar - 28 Aug 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Related information:
Composition 1
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Qualifier:
according to
Guideline:
other: CIPAC MT 1: Freezing Point
Version / remarks:
2009
GLP compliance:
no
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Key result
Melting / freezing pt.:
-83.2 °C
Atm. press.:
1 001 - 1 003 hPa
Decomposition:
no

In the temperature range of -90 to -70 °C, a small endothermic effect (melting) was observed. Between approx. 60 - 280 °C a second endothermic effect (boiling) could be detected. 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

PN13074

14.95

-83.13

250.57

-90 to -70 (endo)

70 - 280 (endo)

14.85

1002.6

PN13308

14.65

-83.18

250.95

-90 to -70 (endo)

60 - 280 (endo)

14.64

1001.0

 

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

During the heating phase a small endothermic effect was observed in the temperature range of -90 to -70 °C, which can be assigned to 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 -83.16 °C, the test item has a melting point of -83.2 °C.

Due to the small melting peak, the melting of the test item was verified. 2.0 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -90 °C. In the temperature range of approx. -90 to -85 °C the test item was solid. The appearance of the test item during warming up: at approx. -75 °C very viscous, at -60 °C viscous. Therefore the melting point in the DSC-measurement was confirmed.

 

Final Results

The test item has a melting point of -83.2 °C at atmospheric pressure (1001 - 1003 hPa) 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 of -83.2 °C at 1001-1003 hPa was determined for the test substance according to E.U. Method A.1.

Description of key information

Melting point: -83.2 °C at 1001-1003 (EU Method A.1, differential scanning calorimetry)

Key value for chemical safety assessment

Additional information