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EC number: 219-784-2
CAS number: 2530-83-8
is a liquid at standard temperature and pressure, with a melting point
of -20°C, and a measured boiling point of 260.4°C.
It has a measured relative density of
20°C, a measured kinematic viscosity of 3.43
mm²/s at 20°C and
a predicted vapour pressure of 1.1 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
and a measured boiling point of 260.4°C.
It has a measured auto-ignition temperature of 236°C
at 97.7 to 98.4 kPa and
is not oxidising on the basis of chemical structure.
[3-(2,3-Epoxypropoxy)propyl]trimethoxysilane was obtained not to exhibit
explosivity hazard under the conditions of an EU Method A.14 test method.
In contact with
water [3-(2,3-epoxypropoxy)propyl]trimethoxysilane reacts rapidly
(half-life of 6.5 hours at pH 7, 0.15 hours at pH 5, 0.13 hours at pH 9
and 24.5°C) to produce [3-(2,3-epoxypropxy)propyl]silanetriol and
methanol according to the following equation:
+ 3H2O ¿ Si(OH)3(C3H6OC3H5O) + 3CH3OH
requirements for testing of water-based physicochemical properties for
the substance are waived on the basis of instability in water. The
properties of the silanol hydrolysis product,
[3-(2,3-epoxypropoxy)propyl]silanetriol and methanol are assessed
instead. However, the log Kow and water solubility of the
submission substance was predicted to be 0.5 at 20°C and 1.1E+05 mg/l at
miscible with water, has low log Kow (-0.82 to -0.64) and
high vapour pressure (12790 Pa at 20°C) (OECD, 2004a: SIDS Initial
Assessment Report for SIAM 19, Berlin, Germany, 18 - 20 October 2004,
Methanol, CAS 67-56-1).
concentration in water of the hydrolysis product,
[3-(2,3-epoxypropoxy)propyl]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 has a
low log Kow (-2.6, predicted).
is not expected to be surface active and 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. It is much
less volatile than the parent substance (vapour pressure = 1.7E-05 Pa at
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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