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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2/Chesar 3.5), see table below. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the hydrolysis products, 3-(trihydroxysilyl)propyl methacrylate and methanol.


Table: Distribution modelling for STP


3-(Trihydroxysilyl)propyl methacrylate



Release directed to water




Release directed to air




Release directed to sludge




Release degraded





3-Trimethoxysilylpropyl methacrylate hydrolyses rapidly to 3-(trihydroxysilyl)propyl methacrylate and methanol. 3-Trimethoxysilylpropyl methacrylate is readily biodegradable but failing the 10-day window. Once the biodegradation of the alkoxy groups is taken into account, there is evidence that the methacrylate side-chain is biodegrading to some extent, but as a worst-case; 3-(trihydroxysilyl)propyl methacrylate is considered to be not biodegradable. Methanol is readily biodegradable.


3-(Trihydroxysilyl)propyl methacrylate has very low Henry’s Law Constant, and low log Kow/log Koc. Distribution modelling for STP indicates that water is the main compartment to which 3-(trihydroxysilyl)propyl methacrylate is expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which it will partition in the wider environment.