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Environmental fate & pathways

Henry's Law constant

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Description of key information

Henry's Law constant (TMA): 1.29E-5 Pa-m3/mole
Henry's Law constant (TMLA): 1.01E-7 Pa-m3/mole

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
25 °C

Additional information

The most significant value in terms of environmental assessment is relative to the acid form of the anhydride, because trimellitic anhydride hydrolyses almost instantaneously on contact with water to give trimellitic acid.

The HLC limit value of 1.01E-7 Pa m³/mol at 25 deg C indicates that trimellitic acid is essentially not volatile from surface water.