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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Environmental fate & pathways

Henry's Law constant

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Description of key information

The HLC of 1,1-dichloroethylene has been calculated according to the equation R16-4 of ECHA guidance. 

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
2 572
at the temperature of:
20 °C

Additional information

The Henry's Law constant of 1,1 -dichloroethene has been calculated according to the equation R16 -4 of the guidance on information requirements and chemical safety assessment - chapter R16: environmental exposure assessment (ECHA 2012).

The equation used is the following :


With :

VP = 66340 Pa at 20°C

MOLW = 96.94 g/mol

SOL = 2500 mg/L at 20°C.

The Henry's Law Constant has been calculated to be 2572 Pa.m3/mol (corresponding to 2.5 atm.m3/mol). Therefore, 1,1 -dichloroethylene is considered as highly volatile from water at 20°C.

Published data from handbook and HENRYWIN support this high volatility.

Additionally, data on the half-life of volatilisation of 1,1 -dichloroethene from water support this high HLC value as listed below :

- t1/2 = 27 min at 20°C (Dilling, 1977)

- t1/2 = 1.03h from river and 93.8h from lake (calculation of Episuite)