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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Remarks:
Additionally a thermogravimetry was performed.
Remarks on result:
other: no melting point detectable

No melting point is detectable for the test substance. The measured endothermic effects at 53 °C - 60 °C are caused by the elimination of crystal water. With polarized light under a melting point microscope nor melting or change in modification could be observed.

In the thermogravimetry test with heating rate 10 K/min up to 300 °C a mass loss of 24.9 % was detected which equals 3.7 mol crystal water (theoretical value: 27.2 % equals 4 mol crystal water).

Description of key information

no melting point detectable in DTA

endothermic effects at 53 °C - 60 °C

(EU Method A.1)

Key value for chemical safety assessment

Additional information

In a DTA according to EU Method A.1 no melting point was detactable for sodium 2-biphenylate (hydrated form). The measured endothermic effects at 53 °C to 60 °C are caused by elimination of crystal water. With polarized light under a melting point microscope nor melting or change in modification could be observed.

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