Registration Dossier
Registration Dossier
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EC number: 253-930-6 | CAS number: 38436-16-7
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water solubility [[2-(perfluorobutyl)ethyl]dichloro(methyl)silane]: Not relevant
Water solubility [[2-(perfluorobutyl)ethyl]methylsilanediol]: 2 mg/l at 20°C (QSAR)
Key value for chemical safety assessment
Additional information
The requirement to conduct a water solubility study for the submission substance is waived on the basis that in contact with water, it hydrolyses very rapidly to form [2-(perfluorobutyl)ethyl](methyl)silanediol and hydrochloric acid. The silanol hydrolysis product, [2-(perfluorobutyl)ethyl](methyl)silanediol, may undergo condensation reactions in water, for further details, see the overall physicochemical properties discussion.
The hydrolysis product, [2-(perfluorobutyl)ethyl](methyl)silanediol, is slightly soluble in water based on the calculated solubility of 2 mg/l using a QSAR method. The prediction is considered to be valid for use in calculation of the Henry's Law Constant and for environmental exposure modelling and toxicokinetics modelling because it is considered to adequately describe the partitioning behaviour of the substance.
The chemical structure contains a perfluorobutyl chain; fluorocarbons have very low solubility in water, relative to hydrocarbons of equivalent chain length, (e.g. Horvath 1982), so it would be expected that a substance with this R group would be of low solubility. The effective limits of solubility of both the parent substance and monomeric silanol hydrolysis products are very low. Condensation phenomena may limit the extent of hydrolysis under conditions at which the solubility of either parent or oligomer is exceeded. The predicted rates presented above relate to dilute conditions. These factors are important in any consideration of aqueous behaviour and properties.
Horvath, A.L., 1982. Halogenated hydrocarbons: solubility-Miscibility with water. CRC press 26 Feb 1982
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