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EC number: 200-867-7
CAS number: 75-38-7
substance is a gas under all environmental conditions and only slightly
soluble in water. It
has a high vapour pressure and therefore environmental releases will
result in virtually all of the substance compartmentalising into the
atmosphere. Any potential atmospheric deposition to land and water would
result in rapid redistribution from soil and water due to its volatility
and low sorption to soil. This
is supported by a Level I fugacity model (Mackay, 2003) which is used to
calculate the theoretical distribution of VDF between four environmental
compartments (air, water, soil, sediment) at equilibrium in a unit
world. The model calculates that 100% of VDF partitions to the
atmosphere and a very small portion partitions to water (0.03%).
VDF is not
expected to hydrolyse under normal environmental conditions.
undergoes reactions with hydroxyl radicals in the atmosphere. Using a
degradation rate constant of 2.27E-12 cm3/molecule/ses the half life of
VDF AOPWIN™ vv1.92a
(U.S. EPA, 2008), based on a 12-hr day with an OH radical concentration
of 1.5E6 OH/cm3, is 4.7 days (see Annexes 2 and 3 for the QMRF and QPRF).
No data on
biodegradability is available. Information from related gaseous
materials (pentafluoroethane and vinylidine chloride) generally showed ≤
5% degradation (SIDS, 2005 and NITE, 1992) Based on these analogous
substances, VDF is not expected to be readily biodegradable (see Annex 4
for the Reporting Format).
calculated organic carbon-water partitioning coefficient (Koc) is
available from KOCWIN™ v2.00
(U.S. EPA,, 2008). The calculated Koc is estimated to be 11.9 L/kg (log
value is 1.08)(see Annexes 5 and 6 for the QMRF and QPRF).
VDF has an
experimental log Kow of 1.24. This value indicates that possible
bioaccumulation in the food chain is not significant. Based on its
limited water solubility and the substance being a gas, it can be
concluded that VDF will volatilize rapidly, and therefore partition
nearly exclusively to air (>99%) and will not remain in the water.
Significant contact with the organisms in the food chain can therefore
considered to be negligible. This is supported by the BCF of 3.06 L/kg
calculated with BCFBAF™ v3.00
(U.S. EPA, 2008)(see Annexes 7 and 8 for the QMRF and QPRF).
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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