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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure of tetrahydromethylphthalic anhydride (MTHPA) is estimated at 0.0028 mmHg = 0.373 Pa at 298K (25 degree C) by QSAR. 

Key value for chemical safety assessment

Vapour pressure:
0.373 Pa
at the temperature of:
298 K

Additional information

The vapour pressure of tetrahydromethylphthalic anhydride (MTHPA) was calculated by 3 different QSAR models at 25 degree C:

- 0.00243 -0.00294 mmHg (MPBPVP v1.43 (Mean VP of Antoine & Grain methods)

- 0.00238 -0.00286 mmHg (AEROWIN v1.00)

- 0.0033 mmHg (Antonie equation)

The mean value of 0.0028 mmHg = 0.373 Pa was considered reliable in a Weight of Evidence approach.