Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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-[3,3,3-Trimethyl-1,1-bis[(trimethylsilyl)oxy]disiloxanyl]propyl methacrylate is a liquid at ambient temperature and pressure, with a measured freezing point of <-100°C and a measured boiling point of 292.7°C. It has a relative density of 0.925 at 20°C, a kinematic viscosity of 4.91 mm2/s at 20°C and measured vapour pressure values of 0.11 Pa at 20°C, 0.38 Pa at 30°C and 4.8 Pa at 50°C.

The substance is not classified for flammability on the basis of a measured flash point of 142.5°C and measured boiling point of 292.7°C. It has a measured auto-ignition temperature of 354°C, and is not explosive and not oxidising on the basis of chemical structure.

In contact with water, the substance reacts slowly, half-lives of 3.6 hours at pH 4, 630 hours at pH 7 and 5.3 hours at pH 9 and 20-25°C. The stated half-life is for removal of parent substance. Complete reaction to the ultimate end products will take longer. The reaction equation is shown below:

C16H38O5Si4 + 2H2O → C7H14O5Si + 3(CH3)3SiOH

The substance has a predicted water solubility of 5.8E-05 mg/l at 20°C and a predicted log Kow of 9 at 20°C. The substance is not surface active based on examination of the chemical structure.

Additional information