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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:
14-Jul-2015 to 24-Jul-2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
GLP 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)
GLP compliance:
yes (incl. certificate)
Remarks:
Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
< -100 °C
Atm. press.:
ca. 1 004 hPa
Remarks on result:
other: No freezing / melting point at atmospheric pressure down to -100 °C.

Results of the DSC-measurements

In the temperature range of -40 to -10 °C, a very small endothermic effect with an energy of <10 J/g was observed. In the temperature range of 140 – 350 °C an exothermic effect could be detected, with an average decomposition energy of approximately -340 J/g, directly followed by a second exothermic effect in the temperature range of 350 – 450 °C, with an average decomposition energy of approximately -250 J/g.

No.

Sample weight / mg

Onset of Effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa

PN9175

19.10

-34.21

-

-

-40 to -20 (endo)

160 to 350 (exo)

350 – 450 (exo)

18.04

1004.2

PN9176

12.42

-35.06

-

-

-40 to -10 (endo)

140 to 350 (exo)

350 – 430 (exo)

11.76

1004.2

 

The endothermic effects which could be observed during the heating phase are very small and do not represent the melting of the test item.

For a verification of the appearance of the test item at approximately -30 °C, a sample of the test item was placed in a freezer at a temperature of -24.8 °C and checked with a spatula after one day. After one day at -24.8 °C the test item appeared as a rubber like sticky mass. It was not solidified.

According to the DSC measurements and the visual verification in the freezer, the test item has no freezing / melting point at atmospheric pressure down to -100 °C. The test item showed only a slight solidification. The test item has no boiling up to its decomposition starting at a temperature of about 140 °C.

Description of key information

No freezing / melting point at atmospheric pressure down to -100 °C at 1004 hPa (OECD 102, A.1.).

Key value for chemical safety assessment

Additional information

The melting point of the substance was determined by using Differential Scanning Calorimetry (DSC) method.