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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
7 May 2013
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)
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.:
>= 226.9 - <= 229.6 °C
Atm. press.:
1 013 hPa

The measurements in aluminium crucibles with a hole showed an endothermal effect in the temperature range of 210 - 240 °C with an onset temperature of 227 °C to 230 °C. An exothermal effect was observed in the temperature range of 240 - 495 °C with an energy of 934 J/g and 1470 J/g, respectively. The onset temperature was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline.

The test item had a melting range of 226.9 °C to 229.6 °C.

Ident-No.

Onset / °C

Temperature range / °C

Crucible

33742

226.89

210 to 240

Aluminium with a hole

33743

229.56

210 to 240

Aluminium with a hole

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
17 to 24 November 2015
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)
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.:
>= 228.4 - <= 230.1 °C
Atm. press.:
ca. 1 013 hPa

Three measurements in aluminium crucibles with a hole showed an endothermal effect in the temperature range of 205 - 245 °C with onset temperatures of 228.42 °C - 230.06 °C. The results are summarized in the table below.

 

Melting point (DSC measurement)

Ident No.

Test item / mg

Measurement range / °C

Temperature range / °C

Type of effect

Onset / °C

Remarks

35321

9.39

Ambient temperature - 400

205 -245

245 - 365

endethermal

exothermal

230.06

n.r.

aluminium crucible with a hole; mass loss: 3.77 mg; discoleured to black

35323

9.52

Ambient temperature - 400

210 - 240

240 - 360

endethermal

exothermal

228.42

n.r.

aluminium crucible with a hole; mass loss: 3.71 mg; discoleured to black

35353

10.04

Ambient temperature - 240

210 - 240

endethermal

228.66

aluminium crucible with a hole; no mass loss; orange melt

n.r.: not relevant

 

The test item had a melting range under decomposition of 228.4 - 230.1 °C.

Description of key information

Melting range: 226.9 °C to 229.6 °C (pure substance) - 228.4 - 230.1 °C (technical substance)

(OECD Guideline 102, DSC measurement)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
228.4 °C

Additional information

The lower value of the melting range for technical substance has been selected as key value. Technical purity represents better the reality and the lower temperature value has been selected as the "worst case".