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EC number: 201-201-8
CAS number: 79-38-9
The EQC Fugacity III
Fugacity III Model, v.2.02, May 2003)
With respect to
reactions with hydroxyl radicals, a rate constant of 7.27 x 10^-12 cm
cu/mol sec measured at 297 K (24°C) has been estimated for CTFE this
corresponds to an atmospheric half-life of about 2.2 days at an
atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm (Abbatt
J.P.D. et al., 1991).
CTFE does not contain
chromophores that absorb at wavelengths >290 nm and therefore is not
expected to be susceptible to direct photolysis by sunlight
( Howard C.J. 1996).
CTFE is not listed in
the Scientific Assessment of Ozone Depletion of the World Metereological
Organization/United nations Environment Programme (WMO/UNEP) or the
Montreal Protocol as it is not considered as a substance contributing to
the Ozone depletion.
Due to the gaseous
nature of the substance and its tendency to partition into the air, the
hydrolytic degradation of CTFE is neither measurable nor expected.
Moreover, the Guidance
on Information Requirements and Chemical Safety Assessment Chapter R.7a:
Endpoint Specific Guidance, Appendix R.7.1-4 indicates that substances
with a Henry's Law constant of around 1 hPa m3/mole rapidly volatilise
According to section 2
of REACh Annex XI, testing hydrolysis is not technically feasible as
CTFEis a volatile gas at ambient conditions.
Although no partition
into water is expected, the tendency to hydrolyze has been however
assessed basing on the chemical structure of CTFE molecule.
This does not contain
any functional groups associated with hydrolysis properties at relevant
carbon-fluorine bond is the strongest bond in organic chemistry
(O'Hagan, 2008). Substitution of hydrogen atoms with fluorine results in
increased bond strengths for both carbon-fluorine and adjacent
carbon-carbon bonds over the corresponding hydrocarbon and would
increase the resistance to hydrolysis (Lemal, 2003). Therefore, based on
this qualitative structure-activity relationship, it can be concluded
that hydrolysis is not a relevant degradation mechanism for CTFE.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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