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Description of key information

Henry's Law Constant: Calculated HLC for silanol hydrolysis product at environmental temperature (12°C): 1.4 E+10 Pa m3mol-1

Key value for chemical safety assessment

Additional information

The transfer of a substance from the water phase to the gas phase can be estimated by means of the Henry’s Law Constant (HLC). No measured value for this parameter is available. The HLC can be estimated from the ratio of the vapour pressure (VP) to the water solubility (WS).

HLC = (VP x MW)/WS

Where MW is molecular weight.

The calculated HLC value for F-D3 at environmental temperature (12°C) is very high, 1.4 E+10 Pa m3mol-1 (taken from EUSES 2.1.2).

The transfer of a substance from the soil phase to the gas phase can be estimated by the air-soil partition coefficient (Kair-soil). Kair-soilis calculated as Kair-water/Ksoil-water. Kair-wateris the calculated dimensionless HLC; Ksoil-watermay be determined using equations R.16-6/R.16-7 in REACH R16. The Kair-soilis calculated as 4.93 at 20°C (based on Kair-water1.12E+07 and Ksoil-water2.27E+06). A threshold Kair-soil>1 is used in order to determine the feasibility of testing in soil (OECD TG 222).