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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Readily biodegradable: MITI-I-Test (OECD 301C): 94% degradation after 14 days

Additional information

For the evaluation of the biodegradability of methyl methacrylate the following test result is considered:

MITI-I-Test (OECD 301C): 94% degradation after 14 days. (CITI, 1992).

Although in the key-study the criterion of the 10-day window was not assessed, the high degradation rate of 94% within 14 days in the MITI-I-Test indicates that the criterion of the 10 d-window is likely fulfilled.

This result is confirmed by a test according ISO 10707 where methyl methacrylate degraded 62 % after 7 days and achieved 98 % after 28 days (LGU, 2003).

Two additional tests are available where methyl methacrylate did not achieve the criteria readily biodegradable. In an OECD 301 D Closed bottle test methyl methacrylate achieved 88 % degradation after 28 days but failed the 10-day window. The trend of the biodegradation curve of MMA is however implausible in this test due to the simple structure of the substance. Measurements were conducted only on 3 days on day 5, 15 and 28 (Huntingdon, 1992).

A second OECD 301 C modified MITI test is available with methyl methacrylate. After day 5 and ca. 30 % the degradation curve remained static and no further degradation occurred. This result is implausible in contrast to other biodegradation tests with methyl methacrylate. It seems that after 5 days no test substance has been left due to technical reasons (Fraunhofer, 1988).

In summary methyl methacrylate fulfills the criteria readily biodegradability according CLP.