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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

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.