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Environmental fate & pathways

Henry's Law constant

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Description of key information

From the water surface, the substance will not evaporate into the atmosphere.

Key value for chemical safety assessment

Additional information

The Henry's Law Constant for PACM (4,4'-methylenebis(cyclohexylamine)) was estimated by the bond estimation method of the HENRYWIN Program (v3.20) of EPI Suite v4.10 to be 4.6E-04 Pa m³/mol at 25 °C, which is equal to 4.54E-09 atm m³/mol. A value calculated by the ratio of vapour pressure to water solubility results in a supporting value (9.39E-04 Pa m³/mol at 20 °C) that is within a factor of two of the key value, a low level of variability for this parameter. At environmental conditions (pH 5 to 9) the molecule is expected to be ionised, therefore a pH-corrected HLC was calculated according to the REACH Guidance document (2008). The resulting Henry's Law Constant was 3.65-08 Pa m³/mol at pH 7 (range pH 5 to 9: 3.65E-10 to 3.63E-06 Pa m³/mol; BASF, 2012).