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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

(1,1,3,3-Tetramethyldisiloxane-1,3-diyl)dipropane-1,3-diyl dimethacrylate is a liquid at standard temperature and pressure, with a measured melting point of <-80°C. The substance was observed to undergo thermal decomposition from >200°C at 1013 hPa. It has a predicted density of 0.90 g/cm3 at 20°C and a predicted vapour pressure of 0.005 Pa at 25°C.

The substance is not classified for flammability according to Regulation (EC) No. 1272/2008 on the basis of a flash point of 137°C and a decomposition temperature of >200°C at 1013 hPa. It has a measured auto-ignition temperature of 288°C at 1013 hPa, and is not explosive and not oxidising on the basis of structural examination.

In contact with water, (1,1,3,3-tetramethyldisiloxane-1,3-diyl)dipropane-1,3-diyl dimethacrylate reacts slowly (half-life of 1.1 hours at pH 4, 63 hours at pH 7, 0.8 hours at pH 9 and 20-25°C) to produce 3-[hydroxy(dimethyl)silyl]propyl methacrylate according to the following equation:

C18H34O5Si2+ H2O → 2C9H18O3Si


(1,1,3,3-Tetramethyldisiloxane-1,3-diyl)dipropane-1,3-diyl dimethacrylate has a predicted log Kow value of 8.1 at 20°C and predicted water solubility value of 1.5E-03 mg/l at 20°C.

The saturation concentration in water of the silanol hydrolysis product, 3-[hydroxy(dimethyl)silyl]propyl methacrylate is limited by condensation reactions to approximately 30 mg/l with a predicted log Kow value of 2.6. It is not surface active and has a predicted vapour pressure of 4.8E-02 Pa at 25°C.


Additional information