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EC number: 201-297-1
CAS number: 80-62-6
In a modiefied MITI test (OECD 301C) the biodegradation of methyl
methacrylate was 94.3% after 14 days.
In a biodegradation test acc. ISO 10707 in closed bottels methyl
Methyl methacrylate is readily biodegradable in OECD 301 screening test, fulfilling 10 -day window.
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,
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
This result is confirmed by a test according ISO 10707 where
methyl methacrylate degraded 62 % after 7 days (10-day window fulfilled)
and achieved 98 % after 28 days (LGU, 2003).
Two additional tests are available where methyl methacrylate did
not achieve the criteria of readily biodegradability: 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 % biodegradation 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.
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