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Henry's Law constant

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Description of key information

For tert-butyl acrylate the Henry's Law constant is calculated to be 21.9 Pa·m³/mole at 25 °C based on the Bond method. From the water surface, tert-Butyl acrylate will slowly evaporate into the atmosphere.

Key value for chemical safety assessment

Additional information

Henry's Law Constant was calculated by Q(SAR) (SRC HENRYWIN v3.20) (BASF SE, 2017). The constant was estimated to be 21.9 Pa*m3/mol at 25 °C indicating slow evaporation of tert-butyl acrylate from the water surface into the atmosphere.


In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met. 

According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided. 

For the assessment of tert-butyl acrylate (Q)SAR results were used for the Henry's law constant.The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.