Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Henry's Law constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
20 °C

Additional information

The Henry’s law constant (HLC) of NPEO was estimated by HENRYWIN v3.20 ( (EPIWEB v 4.0) using the bond and group contribution methods, based on HLC values for the individual components of the substance. Since the estimates by the bond and group methods were not different, the values were averaged. The HLC for NPEO was finally calculated on a weighted-average basis using the mole fractions of the individual components. The HLC were also estimated for three typical isomers (due to branching) of the nonyl chain of NPEO (i.e. 1, 2-dimethyl-1-ethyl-pentyl phenol EO-2; 1,3-dimethyl-1-propyl-butyl phenol EO-2; 1-ethyl-1-methyl-hexyl phenol E-2). There were only minor differences in the results obtained, with values ranging from 2.16 x 10-9 to 2.3 x 10-9 atm-m3/mole. The average estimated HLC for NPEO was 3.21 x 10-7 atm-m3/mole (3.25 x 10-2 Pa-m3/mole). There was no significant impact of branching of nonyl chains (isomers) on the HLC estimation.