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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Henry's Law constant

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Administrative data

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Description of key information

Henry's Law constants:

- hexahydrophthalic acid (HHPAc): 2.71E-4 Pa-m3/mole

- cyclohexane-1,2-dicarboxylic anhydride (HHPA): 6.52E-4 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 Henry's Law constants of hexahydrophthalic acid (HHPAc), as hydrolysis product of cyclohexane-1,2-dicarboxylic anhydride (HHPA), was considered for the environmental assessment.

The value of 2.71E-4 Pa m³/mol shows that HHPAc is essentially non volatile from surface water.