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EC number: 257-473-3
CAS number: 51851-37-7
is a liquid at standard temperature and pressure, with a measured
melting point of <-100°C, and a measured boiling point of 225°C. It has
a measure relative density of 1.3417 at 20°C and a predicted vapour
pressure of 9.8 Pa at 25°C.
The submission substance has
a predicted log Kow value of 7.2 at 20°C using a validated
QSAR estimation method and a measured limit water solubility value of <2
mg/L at 20°C and pH 6.29.
The predicted water solubility of
[2-(perfluorohexyl)ethyl]triethoxysilane is <1 mg/L at 20°C. A
surface tension value of 72.2 mN/m at 20°C and 10 mg/L was obtained for
The substance is not classified
for flammability according to Regulation (EC) No. 1272/2008 on the basis
of a measured flash point of 108.5°C and a measured boiling point of
225°C. It has a measured auto-ignition temperature of 245°C and is not
explosive and not oxidising on the basis of chemical structure.
In contact with water under dilute
conditions, [2-(perfluorohexyl)ethyl]triethoxysilane reacts moderately
(half-life of 12.5 hours at pH 7, 1.44 hours at pH 4, 5.18 hours at pH 9
and 20°C) to produce [2-(perfluorohexyl)ethyl]silanetriol and ethanol
according to the following equation:
C14H19SiO3F13+ 3H2O → C8H7F13O3Si + 3CH3CH2OH
may undergo condensation reactions to give siloxane dimers, oligomers
and polymers, according to the scheme:
RSi(OH)3 ⇄ RSi(OH)2OSi(OH)2R ⇄ RSi(OH)2O[Si(R)(OH)O]nSi(OH)2R
R is an alkyl or aryl side-chain)
highly cross-linked gel may form. The degree of condensation that will
occur may vary with:
In the case of this substance the R group contains a
perfluorohexyl 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 corresponding monomeric silanetriol is expected to
be surface active based on measured and read across data. The presence
of fluorocarbon chains may mean that condensation products could have
some surface activity. For these reasons, the effective limits of
solubility of both the parent substance and monomeric silanol hydrolysis
products are very low and all forms of the substance may have a tendency
to enrich at surfaces rather than forming stable evenly dispersed
solutions. These phenomena may limit the extent of hydrolysis under
conditions at which the solubility of either parent or oligomer is
exceeded. The measured rates presented above relate to dilute
conditions. These factors are important in any consideration of aqueous
behaviour and properties.
is miscible with water, has low log Kow (-0.3) and high
vapour pressure (7910 Pa at 25°C).
silanol hydrolysis product, [2-(perfluorohexyl)ethyl]silanetriol
has a predicted water solubility of 0.58 mg/l at 20°C using a QSAR
method and a predicted log Kow of 2.8.
surface tension of [2-(perfluorohexyl)ethyl]triethoxysilane
was waived because the submission substance has a predicted
solubility of <1 mg/L
at 20°C. The silanol hydrolysis is considered to be surface active based
on a measured surface tension value of <22 mN/m at 20°C and 1 g/l.
much less volatile than the parent substance (vapour pressure = 6.9E-03
Pa at 25°C, predicted).
Horvath, A.L (1982). Halogenated hydrocarbons:
solubility-Miscibility with water. CRC press 26 Feb 1982
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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