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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of trimellitic anhydride (TMA) was determined at 32 and 40°C, using the gas saturation method.
The VP-temperature relationship based on the Clausius-Clapeyron equation was used to extrapolate to temperatures (20 and 25°C) below the range of measurement. The method is generally suitable for materials that are relatively non-volatile and have high boiling points and is more reliable than extrapolations based on data obtained with molten material.
Extrapolated vapour pressures of TMA at 20 and 25 deg C were 0.0000653 and 0.0000738 Pa, respectively. These values are very low compared to normal atmospheric pressure.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

The supporting study reports a second extrapolated vapour pressure, at 25 deg C, equal to 0.0000152 Pa (1.5E-10 atm), having the same order of magnitude of the key study.