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EC number: 242-056-0
CAS number: 18171-19-2
is a liquid at ambient temperature and pressure, with a measured melting
point of <-100°C at 1013 hPa and a predicted boiling point of 180°C at
1013 hPa. It has a predicted density of 1.01 g/cm3 at 20°C, a
predicted kinematic viscosity of 1.4 mm2/s at 20°C. The
substance has a measured vapour pressure values of 67.2 Pa at 20°C, 94.4
Pa at 25°C and 440.3 Pa at 50°C.
The presence of higher
concentrations of volatile impurities such as methanol (a hydrolysis
product of the substance) can result in a lower flash point. The
substance has a measured flash point in the range 41 - 70°C. It has a
measured auto-ignition temperature of 220°C at 1008 -1009 mBar. It is
not explosive and not oxidising on the basis of chemical structure.
In contact with water,
3-chloropropyl(dimethoxy)methylsilane reacts rapidly (half-life = 0.1 h
at pH 4, 1.3 hour at pH 7 and 0.03 h at pH 9 and 20-25°C, predicted)
according to the following equation to produce
3-chloropropyl(methyl)silanediol and methanol:
+ 2H2O → Cl(CH2)3Si(CH3)(OH)2
requirements for testing of water-based physicochemical properties for
the substance are waived on the basis of instability in water. The
properties of the hydrolysis products, 3-chloropropyl(methyl)silanediol
and methanol, are assessed instead.
the properties of the parent substance, 3-chloropropyl(dimethoxy)methylsilane
have been predicted using validated QSAR estimation methods.
3-Chloropropyl(dimethoxy)methylsilane has predicted log Kow
value of 3.2 and predicted water solubility value of 370 mg/L at 20°C.
Methanol is miscible with water,
has low log Kow (-0.82 to -0.64) and high vapour pressure
(12,790 Pa at 20°C) (OECD 2004a).
saturation concentration in water of the silanol hydrolysis product,
3-chloropropyl(methyl)silanediol is limited by condensation reactions
that can occur over time at loadings about 50 mg/L. However,
it is very hydrophilic (calculated solubility is 6.0E+04 mg/L at 20°C
using a QSAR method) and has a low log Kow (0.8, predicted).
not surface active and does not undergo significant dissociation within
the environmentally-relevant range. It is much less volatile than the
parent substance, with a predicted vapour pressure of 0.018 Pa at 25°C.
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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