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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-Aug-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to other 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)
GLP compliance:
no
Type of method:
thermal analysis
Remarks:
Differential Scanning Calorimetry (DSC)
Key result
Melting / freezing pt.:
36.4 °C
Atm. press.:
1 013 hPa

Results

In the thermograms of the two DSC runs (nos. PN7334 and PN7336) an endothermic effect (melting) was observed in the temperature range of 30 – 60 °C. Between 150 - 290 °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)

PN7334

13.22

36.39

275.42

30-60 (endo)

150-290 (endo)

13.17

1005.5

PN7336

11.99

36.48

276.04

30-60 (endo)

150-290 (endo)

11.92

1005.0

The distinct endothermic effect in the temperature range of 30 – 60 °C can be associated with the melting of the test item. As the onset temperatures in both tests do not deviate by more than 0.5 K from their mean value of 36.44 °C, this temperature can be used a melting point. The test item has a melting point of 36.4 °C.

Final Results

The test item has a melting point of 36.4 °C at atmospheric pressure (1013 hPa) as determined by differential scanning calorimetry according to Directive EC40/2008 Method A.1., OECD Test Guideline 102 (1995), EPA OCSPP 830.7200 (1998) and CIPAC MT 1 (2009).

Conclusions:
A melting point value of 36.4 °C (at 1013 hPa) was determined for the test substance according to E.U. Method A.1.

Description of key information

Melting point: 36.4 °C at 1013 hPa (EU Method A.1, differential scanning calorimetry)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
36.4 °C

Additional information