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EC number: 618-014-6 | CAS number: 874288-98-9
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
The Henry's Law Constant (HLC) of 1,2-dichloro-1-[difluoro(trifluoromethoxy)methoxy]-1,2,2-trifluoroethane is calculated to be 5061050 Pa m3/mol (20°C).
The values indicates that 1,2-dichloro-1-[difluoro(trifluoromethoxy)methoxy]-1,2,2-trifluoroethane has a very high tendency to distribute from water to the gas phase.
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 5 061 050
- at the temperature of:
- 20 °C
Additional information
The Henry's Law Constant (HLC) of 1,2-dichloro-1-[difluoro(trifluoromethoxy)methoxy]-1,2,2-trifluoroethane is calculated according to the following equation:
Henry's Law Constant (HLC) = (VP x MOLW) / WS
(Reference: Guidance on Information Requirements and Chemical Safety Assessment_ Chapter R.16: Environmental Exposure Estimation_ Version 2.1_Equation R.16-4)
where:
VP = Vapour pressure (Pa) = 14000 Pa (at 20°C)
MOLW = Molecular Weight (g/mol) = 302.94 g/mol
WS = Water solubility (mg/L) = 0.838 mg/L (at 20°C)
As reported in Guidance on Information Requirements and Chemical Safety Assessment_Chapter R.7a, substances with HLC values around 100 Pa·m3/mol, will have a rapid volatilisationfrom water. Basing on the calculated Henry’s Law constant value, volatilization of 1,2-dichloro-1-[difluoro(trifluoromethoxy)methoxy]-1,2,2-trifluoroethane from water is expected to be extremely rapid.
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