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EC number: 200-867-7
CAS number: 75-38-7
VDF is not expected to hydrolyse under normal environmental conditions.
No data on
the hydrolysis is available for VDF. However, data on hydrolysis from
the structurally similar vinylidene chloride (VDCl) is available from
experimentally derived hydrolysis half-life of VDCl was 1.2E08 years at
25 ºC and pH 7 (Jeffers et al., 1989). As a C-F bond is stronger than a C-Cl
bond (e.g. McGivern et al., 2000),
it can be expected that the hydrolysis half-life of VDF is even higher
than the reported value for VDCl, resulting in a lower hydrolysis rate
constant. It is not possible to calculate a hydrolysis rate constant for
VDF from the available data. However, the rate constant for VDCl
calculated is very small at environmental temperature and pH conditions
and homogeneous hydrolysis certainly can be regarded as negligible. The
extrapolated half-live is very high and as a result, for practical
purposes, the validity of the extrapolation process is beyond question,
and extrapolation errors are irrelevant. Therefore, it should be
concluded that VDF does not significantly hydrolyse and as a reasonable
worst-case assumption the hydrolyis half-life of VDCl can be adopted
(see Annex 1 for the Reporting Format).
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