Registration Dossier
Registration Dossier
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EC number: 211-623-4 | CAS number: 675-62-7
Endpoint summary
Administrative data
Description of key information
Additional information
- Concentration of the silanol; the greater the initial concentration, the greater the degree of condensation. Significant condensation is not expected at concentrations less than approximately 100 mg/l, but is dependent on specific conditions.
- pH; the condensation reaction may be either acid or base catalysed.
- Temperature.
- Other species present.
- Timescale
- The nature of the R group
Physico-chemical properties
Dichloromethyl(3,3,3-trifluoropropyl)silaneis a liquid at standard temperature and pressure, with a measured melting point of -67.7°C and a measured boiling point of 125°C at1013 hPa. It has a measured density of 1.27 g/cm3 at 20°C, a predicted viscosity of 0.5 mm2/s at 20°C and a predicted vapour pressure of 740 Pa at 25°C.
Dichloromethyl(3,3,3-trifluoropropyl)silane is classified as a flammable liquid on the basis of a measured flash point of 34.7°C. The substance has a measured auto-ignition temperature of 398°C, and is not explosive and not oxidising on the basis of chemical structure.
In contact with water, dichloromethyl(3,3,3-trifluoropropyl)silane reacts rapidly to produce methyl(3,3,3-trifluoropropyl)silanedioland hydrogen chloride according to the following equation:
CF3CH2CH2(CH3)SiCl2 + 2 H2O → CF3CH2CH2(CH3)Si(OH)2 + 2 HCl
Therefore, 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, methyl(3,3,3-trifluoropropyl)silanediol, are assessed instead.
Methyl(3,3,3-trifluoropropyl)silanediolis predicted to be very soluble in water (> 10000 mg/l) with a predicted low log Kow value of 1.0. It is not surface active and does not undergo significant dissociation within the environmentally-relevant range. It is much less volatile than the parent substance (vapour pressure of hydrolysis product = 1.3 Pa at 25°C, predicted).
Silanediols 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
(where R is an alkyl or aryl side-chain)
The degree of condensation that will occur may vary with:
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