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EC number: 236-828-6
CAS number: 13501-76-3
is a liquid at standard temperature and pressure, with an estimated
melting point of <20°C, and a measured boiling point of 206°C. It has a
measured relative density of 0.987 at 20°C, a measured viscosity of 1.4
mPasat 25°Cand a predicted vapour
pressure of 6.8 Pa at 20°C.
The substance is not classified as
flammable on the basis of a measured flash point of 74°C and the boiling
point of 206°C. It has a measured auto-ignition temperature of 210°C,
and is not explosive and not oxidising on the basis of chemical
contact with water, (3-chloropropyl)diethoxymethylsilane is predicted to
react very rapidly (half-life 9.5 hours at 20 -
25°C and pH7) to produce (3-chloropropyl)methylsilanediol and
ethanol according to the following equation:
(ClCH2CH2CH2)Si(CH3)(OCH2CH3)2 + 2
(ClCH2CH2CH2)Si(CH3)(OH)2 + 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 silanol hydrolysis product,
(3-chloropropyl)methylsilanediol,are assessed instead. The hydrolysis
product is predicted to be soluble in water (6000 mg/l), with low log Kow
(0.8). It is not surface active. The first dissociation constant
of a structurally analogous silanediol (dimethylsilandiol) has been
reported to be around pKa= 11.9. The hydrolysis product is
less volatile than the parent substance (predicted vapour pressure =
0.021 Pa at 25°C).
is miscible with water, has low log Kow (-0.3) and high
vapour pressure (7910 Pa at 25°C).
may undergo condensation reactions to give siloxane dimers, oligomers
and polymers, according to the scheme:
R2Si(OH)2 ⇄ R2Si(OH)OSi(OH)R2 ⇄ R2Si(OH)O[Si(R2)O]nSi(OH)R2
R is an alkyl or aryl side-chain)
degree of condensation that will occur may vary with:
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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