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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:
28 Jun - 19 Jul 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same 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.:
>= -38 - <= -36 °C
Atm. press.:
985 hPa
Decomposition:
no

Results

In the temperature range of -40 to -30 °C, a small endothermic effect (melting) was observed. Between approx. 190 - 340 °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

PN13684

13.28

-38.10 324.88

-40 to -30 (endo)

190 - 340 (endo)

13.24

985.4

PN13685

10.57

-36.56 324.13

-40 to -30 (endo)

210 - 340 (endo)

10.53

985.4

 

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

During the heating phase a small endothermic effect was observed in the temperature range of -40 to -30 °C, which can be assigned to the melting of the test item. As the onset temperatures in both tests deviate by more than 0.5 K from their mean value of -37.33 °C, the test item has a melting range of -38 to -36 °C.

Due to the broad melting peak, the melting of the test item was verified. 6.9 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -50 °C. In the temperature range of approx. -50 to -38 °C the test item was solid. The appearance of the test item during warming up: at approx. -36 °C very viscous, at -30 °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. 190 - 340 °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 range of -38 to -36 °C at atmospheric pressure (985 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 range of -38 to -36 °C (at 985 hPa) was determined for the test substance according to E.U. Method A.1.

Description of key information

Melting range: -38 to -36 °C at 985 hPa (EU Method A.1., differential scanning calorimetry)

Key value for chemical safety assessment

Additional information