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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:
2017-03-14 to 2017-03-16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted 27 July, 1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
30 May, 2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
120 °C
Atm. press.:
1 013 Pa
Decomposition:
yes
Remarks:
after melting
Sublimation:
no
Remarks on result:
other: decomposition temperature not measureable with DSC

Preliminary test:

Three steps were registered with maxima at 120 °C, 270 °C resp. 470 °C. A total mass loss of 53.2 % at the final temperature could be observed (mass change in the range until 180 °C: 0.9 %; mass change in the range from 180 to 360 °C: 2.0 %, mass change in the range from 360 °C to 600 °C: 50.4 %;). No significant mass loss occurred due to purging.

Main test:

The DSC measurements were performed twice in the temperature range from 20 - 600 °C resp. from 20 - 350°C. A sharp endothermic peak indicating a melting point could be observed (peak maximum: 126 °C/126 °C; extrapolated onset temperature: 120.68 °C/ 120.27 °C; rounded mean of both determinations: 120 °C).

Upon further heating the DSC-curve showed two more peaks: one exothermic peak (peak maximum: 250 °C/ 251 °C) followed by an endothermic peak (peak maximum: 471 °C). The first one is probably due to exothermic decomposition after melting. The second one may be a result of a partial boiling of the decomposed test item. Due to the fact that the thermogravimetric measurement as well as the DSC-measurement did not show a complete mass loss in that temperature range, no normal boiling point could be observed.

Conclusions:
In the present study according to OECD Guideline 102, the melting point of the test item was determined to be 120°C.

Description of key information

- OECD 102 guideline study, GLP, Melting Point: 120°C at 1013 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
120 °C

Additional information

In the present study according to OECD Guideline 102, the melting point of the test item was determined to be 120°C.