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EC number: 208-762-8
CAS number: 540-97-6
Dodecamethylcyclohexasiloxane (D6) is a liquid at standard temperature
and pressure, with a melting point of -3°C at 1013 hPa, and a boiling
point of 245°C at 1013 hPa. It has a density slightly less than that of
water (0.98 g/cm3 at 20°C) and a kinematic viscosity value of
5.6 mm2/s at 20°C. It has a predicted vapour
pressure of 4.7 Pa at 25°C.
The substance is not classified for flammability on the basis of a
measured flash point of 91°C at 1013 hPa and boiling point of 245°C at
1013 hPa in accordance with Regulation (EC) No. 1272/2008. D6 has a
measured autoignition temperature of 368-371°C at 1013 hPa and it is not
explosive and not oxidising on the basis of structural examination.
In contact with water, D6 will hydrolyse very slowly with a hydrolysis
half-life of 42 h at pH 4, approximately 9600 h (401 days) at pH 7 and
125 h at pH 9 and 25°C. The product of hydrolysis is dimethylsilanediol.
[-Si(CH3)2O-]6+ 6H2O →
low water solubility of approximately 5 µg/l at 23°C, and a high log Kow
Based on an examination of the chemical structure, the substance is not
expected to dissocite under relevant environmental conditions. Further
testing for water-based physicochemical properties is waived due to the
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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