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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:
weight of evidence
Study period:
2017-02-02 (experimental phase)
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
n/a
Deviations:
not applicable
Qualifier:
according to
Guideline:
other: DIN 51007, ASTM D 3418-99
Deviations:
no
Principles of method if other than guideline:
Melting point was determined by DSC.
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
175.2 °C
Decomposition:
yes
Decomp. temp.:
ca. 189 °C
Conclusions:
The study was performed according to ASTM D 3418-99 on the substance to be registered itself, the test procedure is well documented and therefore reliability of Klimisch 2 has been assigned. Melting point was determined as 175.2°C, decomposition occurred at ca. 189°C.
Executive summary:

The melting point of the test substance has been determined to be 175.2°C, decomposition occurred at ca. 189°C, by using differential scanning calorimetry (DSC) in a non-GLP study according to ASTM D 3418 -99.

Description of key information

Differential scanning calorimetry (DSC), similar to OECD 102, according to DIN 51007, ASTM D 3418-99: melting point = 175.2°C, decomposition occurred at ca. 189°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
175.2 °C

Additional information

In the available study using differential scanning calorimetry, the melting point was determined to be 175.2°C, decomposition occurred at ca. 189°C. DSC in general is suitable to detect transitions via changes in enthalpy during heating which may be all melting point, boiling point, or decomposition.

Thermogravimetric Analysis however only revealed the start of composition during heating at 162.7 °C. TGA is only able to detect mass changes during heating, e.g. by evaporation of certain compounds during decomposition.

Hence, it can be concluded, despite the differences in onset of decomposition, that the test item melts at 175.2°C, and that the test item definitively decomposes at temperatures close to the melting point without boiling.