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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:
15.05. - 21.08.15
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
> 156 - < 157.4 °C
Atm. press.:
1 013.3 hPa
Decomposition:
no
Sublimation:
no

Two DSC measurements in aluminium crucibles with a hole showed an endothermal effect in the temperature range of 145 - 180 °C with onset temperatures of 156.0 °C and 157.4 °C, respectively. The onset temperatures were derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline.

 

 

Test item / mg

Final test temperature / °C

Temperature range (melting) / °C

Onset / °C

Crucible

Observations

11.69

500

145-180

156.0

Aluminium with a hole

After the measurement a black residue was observed

11.01

220

145 -175

157.4

Aluminium with a hole

Test item appeared clear and melted after the measurement

 

The test item had a melting range of 156.0 - 157.4 °C.

Conclusions:
The melting range of the test item was determined to be in range of 156.0 - 157.4 °C.
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 11 – 12 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). Two DSC measurements showed an endothermal effect in the temperature range of 145 - 180 °C with onset temperatures of 156.0 °C and 157.4 °C, respectively. Thus, it was concluded that the test item has a melting range of 156.0 - 157.4 °C.

Description of key information

The melting range of the test item was determined to be in range of 156.0 - 157.4 °C (reference 4.2 -1).

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry (reference 4.2 -1). The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 11 – 12 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). Two DSC measurements showed an endothermal effect in the temperature range of 145 - 180 °C with onset temperatures of 156.0 °C and 157.4 °C, respectively. Thus, it was concluded that the test item has a melting range of 156.0 - 157.4 °C.