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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The mean melting temperature of maleic acid is 132.5 °C

Handbook data: 130–131 °C and 138–139 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
132.5 °C

Additional information

The determination of the melting temperature of the test substance was performed by the capillary method with hot block heating.

The results of the 3 repeat determinations of the melting temperature for the test substance were: 132.7, 132.4 and 132.4 °C. The mean melting temperature of maleic acid is 132.5 °C, with a standard deviation of 0.14.

Supporting Handbook data: 130–131 °C and 138–139 °C.