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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

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