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Description of key information

[3-(2,3-Epoxypropoxy)propyl]diethoxy(methyl)silane is a liquid at standard temperature and pressure, with a measured melting point of <-80°C, and a predicted boiling point of 260°C. It has a predicted density of 0.94 g/cm3 at 20°C and a measured vapour pressure of 0.42 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 107°C and a predicted boiling point of 260°C. It has a measured auto-ignition temperature of 210°C at 99.57 to 102.24 kPa, and is not explosive and not oxidising on the basis of chemical structure.

In contact with water, [3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane undergoes moderately rapid hydrolysis (half-life of 11.7 hours at pH 7, 0.4 hours at pH 4, 0.2 hours at pH 9 and 20 -25°C) to produce [3-(2,3-epoxypropxy)propyl]methylsilanediol and ethanol according to the following equation:

CH3(OCH3CH2)2Si(C3H6OC3H5O) + 2H2O → CH3Si(OH)2(C3H6OC3H5O) + 2CH3CH2OH


Therefore, the properties of the silanol hydrolysis product, [3-(2,3-epoxypropoxy)propyl]methylsilanediol and the parent submission substance[3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane are obtained.

[3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane has a predicted log Kow of 2.7 at 20°C and a predicted water solubility of 1200 mg/L at 20°C.

Ethanol is miscible with water, has low log Kow (-0.3) and high vapour pressure (7910 Pa at 25°C).

The saturation concentration in water of the hydrolysis product, [3-(2,3-epoxypropoxy)propyl]methylsilanediol 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 (-0.7, predicted).

It is not expected to be surface active and it is much less volatile than the parent substance (vapour pressure = 2.8E-04 Pa at 25°C, predicted).

Additional information