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EC number: 220-778-7
CAS number: 2896-70-0
Studies performed on 2,2,6,6-tetramethyl-4-oxo-piperidinooxy (4-Oxo
Tempo) demonstrated the hydrolytic stability of the substance and the
absence of ready biodegradability. In a guideline
study (Fox, 2012), the half-life with respect to hydrolysis was
extrapolated to be > 1 year at 25oC, a further guideline
study (Commander, 2012) showed biodegradation of <2.6% over a 28 day
period, significantly below the criteria laid out for ready
Biodegradation studies in additional aquatic compartments were not
considered necessary as based on the exposure scenarios in the chemical
safety report, direct or indirect exposure to the environment is
The bioaccumulation or adsorption/desorption potential of the test
substance was not defined by experimental data however based on the
physical chemical properties of the substance (Log Kow 0.28 and water
solubility 216 g/L) the substance is not expected to bioaccumulate or
absorb. No further testing was considered necessary.
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