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EC number: 252-161-3
CAS number: 34708-08-2
CAS 34708-08-2; EC No. 252-161-3, is a liquid at standard temperature
and pressure, with a predicted boiling point of 300°C at 1013 hPa. It
has a predicted density of 1.07 g/cm3 at 20°C and a predicted
vapour pressure of 0.011 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 105°C at 1013 hPa and a predicted boiling
point of 300°C at 1013 hPa. It has a measured auto-ignition temperature
of 230°C at 998-1011 hPa and is not explosive and not oxidising on the
basis of chemical structure.
In contact with water,
triethoxy(3-thiocyanatopropyl)silane reacts moderately rapidly to form
(3-thiocyanatopropyl)silanetriol and ethanol, CAS 64-17-5; EC No.
200-578-6 (half-life: 23 h at pH 7, <0.1 h at pH 4, and 0.8 h at
pH 9 and 25°C) according to the following equation
3H2O → N≡CSCH2CH2CH2Si(OH)3 +
has a predicted water solubility value of 140 mg/L at 20°C and a
predicted log Kow of 3.1.
Due to the moderate hydrolysis of
the registered substance in contact with water, the key physicochemical
properties of the hydrolysis products are presented below.
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-thiocyanatopropyl)silanetriol
is 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 -1.5
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. (3-Thiocyanatopropyl)silanetriol is
much less volatile than the parent substance with a predicted vapour
pressure of 2.0E-06 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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