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EC number: 220-011-6
CAS number: 2602-34-8
is a liquid at
standard temperature and pressure, with a measured melting point of
<-70°C at 1013 hPa and a predicted boiling point of 270°C at 1013 hPa.
It has a predicted density of 0.97 g/cm3 at 20°C, a predicted
vapour pressure of 0.07 Pa at 25°C and a predicted kinematic viscosity
of 2.3 mm2/s at 20°C.
The substance is soluble in water
based on predicted water solubility of 3300 mg/L at 20°C and a predicted
log Kow of 2.0.
The substance is not classified
for flammability according to Regulation EC (No) 1272/2008 on the basis
of a measured flash point of 119°C at 1013 hPa and a predicted boiling
point of 270°C at 1013 hPa. It has a measured auto-ignition temperature
of 230°C at 1002.1-1019.8 hPa and is not oxidising on the basis of
chemical structure. The substance is found not to be explosive based on
read-across from related structural analogue,
[3-(2,3-epoxypropoxy)propyl]trimethoxysilane using EU Method A.14 test
method; the presence of an epoxy group in an organosilicon compound is
not associated with explosive properties.
In contact with water,
[3-(2,3-epoxypropoxy)propyl]triethoxysilane reacts moderately rapidly
(half-life of 12–36 hours at pH 7 and 25°C)
to ultimately produce 2,3-dihydroxypropoxypropylsilanetriol and
ethanol according to the following equation:
+ 4H2O → (CH2OH-CHOHCH2O)CH2OCH2CH2CH2Si(OH)3
Ethanol is miscible with
water, has low log Kow of -0.3 and high vapour pressure of
7910 Pa at 25°C.
saturation concentration in water of the silanol hydrolysis product, 2,3-dihydroxypropoxypropylsilanetriol
limited by condensation reactions that can occur over time at loadings
about 1000 mg/L. However,
it is very hydrophilic (calculated solubility is 1.0E+6 mg/L at 20°C
using a QSAR method) and has a low log Kow of -3.8
The silanol hydrolysis
product is not expected to undergo significant dissociation within the
environmentally-relevant range. The first dissociation constant of a
structurally analogous silanetriol (phenylsilanetriol) has been reported
to be around pKa of 10. 2,3-Dihydroxypropoxypropylsilanetriol is much
less volatile than the parent substance with a predicted vapour pressure
of 1.7E-07 Pa at 25°C and it is not surface active.
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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