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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-03-14 to 2017-03-16
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted 27 July, 1995
according to
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
30 May, 2008
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
120 °C
Atm. press.:
1 013 Pa
after melting
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.

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.