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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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

Volatilisation of organic compounds from surface waters is generally estimated by the Henry’s law constant. The Henry’s law constant for the diamines C16-18 is calculated from the ratio of the vapour pressure (Pa) and the CMC (mol/m3) as determined at pH 7. The vapour pressure of N-C12-14-alkyldiamino propane (90640-43-0) of 0.0015 Pa is used for the calculation of the Henry’s law constant for all the three technical mixtures of diamines C16-18 as a worst-case.


Table 13b: Henry’s law constants for diamines C16-18 (Pa.m3/mol)


VP (Pa)

CMC (mg/L)

MW (g/mol)

H (Pa.m3/mol)

N-9-octa-decenyl-, (Z)-





324.60 (C18=)

1.35 * 10-2




326.61 (C18)

1.36 * 10-2


Considering the low values, volatilisation at environmental conditions is expected to be negligible. For the model calculations, the highest value of 1.36 * 10-2 Pa.m3/mol is used as a worst-case.