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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 to 26 July 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.:
-59.2 °C
Atm. press.:
1 005 hPa
Decomposition:
no

Results                                                                                                                                                            

In the temperature range of -70 to 40 °C an endothermic effect (melting) was observed. Between approx. 70 - 380 °C a second endothermic effect (boiling) could be detected.

 

Results of the DSC-measurements

No.

Sample weight / mg

Onset of Effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa

PN11461

17.12

-59.15
256.43

-70 to 40 (endo)
90 to 380 (endo)

17.05

1005.6

PN11473

17.28

-59.21
248.34

-70 to 20 (endo)
70 to 370 (endo)

17.09

1005.4

 

During the cooling phase, no thermal effect was observed, which can be assigned to the freezing of the test item.

During the heating phase a distinct endothermic effect was observed in the temperature range of -70 to 40 °C, which can be assigned to the melting of the test item. As the onset temperatures in both tests deviate less than 0.5 K from their mean value of -59.18 °C, the test item has a melting point of -59.2 °C.

The test item showed a second endothermic signal in the temperature range of approx.
70 - 380 °C that can be assigned to the boiling of the test item. No further thermal effects were observed up to the maximum test temperature of 500 °C.

 

Final Results

The test item has a melting point of -59.2 °C at atmospheric pressure (1005 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 value of -59.2 °C (at 1005 hPa) was determined for the test substance according to E.U. Method A.1.

Description of key information

Melting point: -59.2 °C at 1005 hPa (EU Method A.1, differential scanning calorimetry)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-59.2 °C

Additional information