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Henry's Law constant

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Description of key information

Aspartic acid, N,N'-(methylenedi-4,1-cyclohexanediyl)bis-, 1,1',4,4'-tetraethyl ester is characterised by a calculated Henry Law Constant of 0.01 Pa*m³/mol (Currenta, 2009b). According to Thomas, cited in the "Handbook of Chemical property Estimation Methods" (Lyman, 1980), the substance has to be scored as non-volatile from water.  

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 constant (HLC) is directly calculated as a ratio of the vapour pressure (0.0018 Pa) to the water solubility (100 mg/L), which are both experimentally determined at 25 °C. The molecular weight (554.7 g/mol) of the test item was also used for the calculation. According to the guidance document R.7a (ECHA, 2008), the estimation based on the vapour pressure and water solubility is acceptable for substances with a water solubility smaller than 1 mol/L.