Registration Dossier
Registration Dossier
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EC number: 415-430-8 | CAS number: 86403-32-9 CYASORB UV-3853 LIGHT STABILIZER; DASTIB 845; SANDUVOR 845
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The substance was found to undergo rapid primary biodegradation in a guideline OECD 301C study as assessed by quantitation of the removal of the test material. As complete breakdown of all products was not achieved, the substance is not considered readily biodegradable.
Key value for chemical safety assessment
Additional information
The main components of CPSS 53 are rapidly converted to 2,2,6,6-tetramethylpiperidin-4-ol (CAS 2403-88-5), palmitic acid and stearic acid. The fatty acids were biodegraded by microorganisms.
The other product of ester hydrolysis, 2,2,6,6-tetramethylpiperidin-4-ol, is not readily biodegradable, as seen in the biodegradation study (OECD 301C) and in an OECD SIDS for 2,2,6,6 -tetramethylpiperidin. Using EPIWIN to estimate degradation for this peperidin-4-ol, the BIOWIN2 (value of 0.3910) and BIOWIN6 (value of 0.4812) predictions are below 0.5 whereas BIOWIN3 predicts a half live between weeks-months (value of 2.6118). This is evaluated as “not readily biodegradable”.
Overall, while the ester linkage is biodegraded, the substance is considered "not readily biodegradable".
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