Registration Dossier
Registration Dossier
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EC number: 213-914-1 | CAS number: 1066-40-6
Endpoint summary
Administrative data
Description of key information
Additional information
Trimethylsilanol is a liquid at standard temperature and pressure, with a melting point of -11.9°C and boiling point of 97.9°C. It has a measured relative density of 0.81 at 20°C, a measured partition coefficient of 1.19 at 25°C and a measured vapour pressure of 19 hPa at 25°C.
The substance is classified for flammability (Flam. Liq. Cat 2 ) according to Regulation (EC) No. 1272/2008, on the basis of a flash point of 7°C at 95.8 kPa and a measured boiling point of 97.9°C.
It has a measured auto-ignition temperature of 395°C at 963 -976 hPa, and is not explosive and not oxidising on the basis of chemical structure.
Trimethylsilanol has a measured water solubility of 995 mg/l at 20°C. In solution, trimethylsilanol may undergo condensation reactions to give the siloxane dimer (hexamethyldisiloxane; CAS No: 107-46-0), and a dynamic equilibrium is established between the monomer and dimer. The reaction is reversible unless the dimer concentration exceeds its solubility; in this case, the dimer forms a separate phase, driving the equilibrium towards the dimer. This is predicted to occur at loadings above about 500-1000 mg/l.
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