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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:
09 Jul - 28 Aug 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to other study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted in 1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
adopted in 2008
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Storage conditions: ambient temperature (10 – 30 °C)
Melting / freezing pt.:
ca. 208.6 °C
Atm. press.:
ca. 1 013 hPa
Decomposition:
yes
Decomp. temp.:
>= 208.6 °C
Remarks on result:
other: Three DSC measurments in aluminum crucibles with a hole showed an endothermal effect in the temperature of 208.6°C (median value). At higher temperatures further endothermal effects were observed which were the melting of the test item.

Results
DSC
Two DSC measurements with a heating rate of 10 K/min showed an endothermal effect (melting) in the temperature range of 195 – 220 °C with an onset temperature of 208.6 °C (median value). At higher temperatures further endothermal effects were seen, which were beyond the melting of the test item.

Table 1 – Melting point DSC measurement results

Test item [mg]

Final temperature [°C]

Temperature range (melting) [°C]

Onset [°C]

Observations

7.76

500

200 – 220

208.45

Measurement continued above the melting

7.78

500

195 – 220

208.60

4.88

250

200 – 220

208.63

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Capillary Method
Table 2 – Results of Capillary Method

Set point [°C]

End point [°C]

Remarks

150

350

Approx. 208 °C: test item started to melt under formation of bubbles
Approx. 214 °C: test item was melted
Approx. 240 °C: test item discoloured to yellow, test item left the observation field

 

Conclusion: The test item melted under decomposition at 208.6 °C.

Description of key information

The test item melted under decomposition at 208.6 °C (OECD 102, DSC).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
208.6 °C

Additional information