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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:
2018-06-26 to 2018-08-02
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:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
210.8 °C
Atm. press.:
1 004.6 hPa
Decomposition:
yes
Decomp. temp.:
260 °C
Sublimation:
no

The test item shows two endothermic effects in the temperature ranges of 200 °C - 230 °C and 300 °C - 380 °C.

The shape of the second endothermic effect suggests that the test item starts to decompose at approx. 290 °C; in view of the weight loss of the sample the decomposition is accompanied with gas formation and/or boiling of the decomposition products. In order to investigate if the first endothermic effect observed in the temperature range from 200 °C - 230 °C  can  be  associated  with  a  melting  of  the  test  item  further  measurements were carried with the capillary method.

Capillary Method

For verification of the results the test item  was additionally tested three times according to the capillary method. In the three tests, the test item melted at a temperature of 221.6 °C, 221.6 °C and 221.7 °C, respectively (mean value: 221.6 °C). At a temperature of 260 °C, the test item started to climb in the capillary. At a temperature of 280 °C, the test item started to turn dark. At a temperature of 315 °C the test item was black. The measurements carried out with the capillary method showed that the first endothermic effect observed in the DSC measurements in the temperature range of 200 °C - 230 °C can be assigned to a melting of the test item. As the onset temperatures of the first endothermic effect  observed  in  the  DSC  measurements  do  not  deviate  by  more  than  0.5 K  from  their mean value of 210.80 °C, the melting temperature is reported as 210.8 °C.

Conclusions:
The test item has a melting point of 210.8 °C at atmospheric pressure (1004.6 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Description of key information

The test item has a melting point of 210.8 °C at atmospheric pressure (1004.6 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
210.8 °C

Additional information