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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure is 9.03E–4 at 20 °C and 1.78E–3 at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
20 °C

Additional information

The vapour pressure of maleic acid was determined following EU method A.4 by the effusion method (weight loss).

For the test item maleic acid, the following vapour pressures at 20 °C and 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C: 9.03 × 10–4 Pa

Vapour pressure at 25 °C: 1.78 × 10–4 Pa

Handbook data: 0.0048 Pa at 25 °C.