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Physical & Chemical properties

Vapour pressure

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Description of key information

Based on a mathematical relationship between temperature and vapour pressure for isophthalic acid (IPA), derived from published VP measurements at various temperatures, the VP of IPA at 25 degrees C is estimated to be 0.000000024 mm Hg (equivalent to 0.00000320 Pa).  
In addition, the vapour pressure of isophthalic acid was estimated using the MPBPVP v1.43 QSAR model available from the US EPA. The predicted vapour pressure of isophthalic acid is 0.00000347 Pa at 25 degrees C (Modified Grain method). The model prediction is in close agreement with the estimate extrapolated from measured vapour pressures.

Key value for chemical safety assessment

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

Additional information

The vapour pressure estimate for isophthalic acid is very low, compared to standard atmospheric pressure and IPA is therefore not likely to volatilise to the atmosphere.