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Environmental fate & pathways

Henry's Law constant

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Description of key information

Henry's Law constants

THPA D3: 3.77E-4 Pa m3/mol

THPA D4: 1.81E-4 Pa m3/mol

THPAc D4: 2.69E-4 Pa m3/mol

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 forms of tetrahydrophthalic anhydride, which hydrolyses almost instantaneously on contact with water.

The HLC value of 2.69E-4 Pa m³/mol at 25°C indicates that tetrahydrophthalic acids are essentially not volatile from surface water.