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Henry's Law constant

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Description of key information

Henry's Law constant: 6.69 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 (HLCs) of diundecyl phthalate, branched and linear (DIPLAST L 11) calculated using the software HENRYWIN v3.20, leads to the following estimated results:


HLC= 6.55 Pa-m3/mole (bond contribution)

HLC= 6.83 Pa-m3/mole (group contribution)


It appears reasonable that the key HLC value, needed for the chemical safety assessment, can be the average of them:


HLC_key= 6.69 Pa-m3/mole (6.60E-05 atm-m3/mole)


The above value indicates that the substance is moderately volatile from surface water.