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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Description of key information

The  melting point of 4-Hydroxy-TEMPO is well described within a range of 70-72 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
70 °C

Additional information

Weight of evidence approach:

In eleven publications between 1964 and 1995 the melting point of 4 -Hydroxy-TEMPO was determined. There are no deviation between the different studies in the value of the melting rage. This melting range of 70 -72 degree Celcius is thus regarded as reliable.