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EC number: 242-419-3
CAS number: 18547-93-8
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
In contact with water,
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
C18H34O5Si2+ H2O → 2C9H18O3Si
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.
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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