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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is readily biodegradable
Justification for type of information:
60% degradation was observed after 11.3days, hence Oxema can be classified as “readily biodegradable, but failing the 10-day window”.

Description of key information

Rapid biodegradation of Oxazolidinyl ethyl methacrylate (OXEMA) was observed in a ready biodegratdation test, as it passed the criterion of 60% for demonstrating “ready biodegradability” in the manometric respirometry test. Nevertheless, the rate of biodegradation was slightly slower than that required to meet the associated 10-day window criterion. The results of this test demonstrated that oxazolidinyl ethyl methacrylate is not inhibitory of the inoculum and can be classified as “readily biodegradable, but failing the 10-day window”, according to the Introduction to Section 3 (Degradation and Accumulation) of the OECD Guidelines (OECD, 2006).

Key value for chemical safety assessment

Additional information

The aqueous hydrolysis rate constant and half-life for oxazolidinyl ethyl methacrylate (OXEMA) has been estimated using the software program HYDROWIN v1.66.

The calculated rate constant for the base-catalysed reaction (Kb) at pH>8 and at 25 degrees C was estimated to be 4.259 x x 10^-3 L/mol-sec. Half-lives at pH 7 and 8 were estimated to be 51.6 years and 5.2 years respectively.