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EC number: 220-778-7
CAS number: 2896-70-0
Hydrolysis data on the test substance has shown the half life to be
greater than 1 year under the conditions of the test. In a study to
determine the ready biodegradability, <2.6% biodegradation was observed
over 28 days, therefore the substance cannot be considered to be readily
biodegradable. As a result of the available data,
2,2,6,6-tetramethyl-4-oxopiperidinooxy is considered to meet the
criteria for 'persistent' and possibly 'very persistent'.
The substance has a Log Kow of 0.28 indicating low potential to
bioaccumulate, therefore does not fulfil the criteria set out to define
The substance has a long-term no-observed effect concentration (NOEC)
for Daphnia Magna of 2.3 mg/L and based on submitted data is not
classified as carcinogenic, mutagenic or toxic to reproduction. There is
no evidence of chronic toxicity therefore the substance does not fulfil
the criteria for 'toxic'.
2,2,6,6-tetramethyl-4-oxopiperidinooxyl is considered to be persistent
or very persistent based on the available test data, however as the
criteria for bioaccumulation or toxicity are not met, the substance is
not considered to be a PBT or vPvB substance.
As 2,2,6,6,-tetramethyl-4-oxopiperidinooxyl does not meet the PBT or
vPvB criteria and as a result of its enclosed manufacturing process
and/or use as a processing aid in the production of monomers in the
polymer industry, no emission characterisation is required.
The most likely route of exposure to the substance is from small scale
drips and sampling. From an environmental perspective, the contained
manufacturing process and specific use on large industrial sites by
trained personnel is not expected to result in environmental exposure.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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