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EC number: 225-805-6
CAS number: 5089-70-3
(CAS 5089-70-3, EC No. 225-805-6) is a liquid at standard temperature
and pressure, with a measured freezing point of <-20°C at 1013 hPa, and
a measured boiling point of 221°C at 1071 hPa. It has a predicted
density of 1.03 g/cm3 at 20°C, a predicted kinematic
viscosity of 1.6 mm2/s at 20°C and a measured vapour pressure
of 30.9 Pa at 25°C.
The substance is not classified
for flammability according to Regulation (EC) No. 1272/2008 on the basis
of a measured flash point of 99°C at 1013 hPa and a measured boiling
point of 221°C at 1013 hPa. It has a measured auto-ignition temperature
of 231°C at 1013 hPa and it is not explosive and not oxidising on the
basis of chemical structure.
In contact with water, the
substance hydrolyses moderately rapidly (half-lives of <0.4 h at pH 4 at
20°C, 35 h at pH 7 and 2 h at pH 9 and 25°C) resulting in the formation
of (3-chloropropyl)silanetriol (CAS 64426-41-4) and ethanol (CAS
64-17-5, EC No. 200-578-6) according to the following equation:
+ 3H2O ¿ Cl(CH2)3Si(OH)3 + 3CH2CH3OH
The properties of the parent
submission substance have been determined using relevant methods. The
substance has a measured log Kow value of 3.13 at 21°C
and pH 7.02-7.61, it has a measured water solubility value of
approximately 113 mg/L at 20°C and pH 4.7.
is miscible with water, has low log Kow (-0.3)
and high vapour pressure (7910 Pa at 25°C).
saturation concentration in water of the silanol hydrolysis product, (3-chloropropyl)silanetriol,
is limited by condensation reactions to approximately 1000 mg/L.
However, it is very hydrophilic (calculated solubility is 1.0E+06 mg/L
using a QSAR method) and it has a predicted log Kow of -1.1.
(3-Chloropropyl)silanetriol is not surface active and is much less
volatile than the parent substance, with a predicted vapour pressure of
2.5E-04 Pa at 25°C.
The first dissociation constant of a structurally analogous
silanetriol (phenylsilanetriol) has been reported to be around pKa of
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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