Registration Dossier
Registration Dossier
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EC number: 407-430-1 | CAS number: 3741-80-8 CP22595; SANTOCURE TBS1
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- N-(1,1-dimethylethyl)bis(2-benzothiazolesulfen)amide
- Type of composition:
- boundary composition of the substance
- Reference substance:
- N-(1,1-dimethylethyl)bis(2-benzothiazolesulfen)amide
- Name:
- N-(1,1-dimethylethyl)bis(2-benzothiazolesulfen)amide
- Type of composition:
- legal entity composition of the substance
- Reference substance:
- N-(1,1-dimethylethyl)bis(2-benzothiazolesulfen)amide
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Persistence
Based on the available information it has to be concluded that (i) the test substance does not biodegrade in water, but (ii) most likely hydrolyses rapidly to TBBS, which in its turn hydrolyzes within 25 hours into the degradation products 2-mercaptobenzothiazole (MBT) and t-buytlamine. TBSI can therefore be considered to be non-persistent according to Annex XIII. However, the degradation products MBT and t-butylamine were observed not to be susceptible to biodegradation.
Bioaccumulation
Since TBSI hydrolyzes very rapidly, the bioaccumulation potential of its degradation products was assessed. The available bioaccumulation test data yielded BCFs clearly below the threshold value set out in Annex XIII. It is therefore concluded that neither TBSI, nor its degradation products fulfill the B criterion.
Toxicity
The available long-term NOECs in freshwater organisms are > 0.01 mg/L. The substance is not classified as carcinogenic, mutagenic or toxic for reproduction, nor is it classified for specific target organ toxicity after repeated exposure. Therefore, it can be concluded that TBSI does not fulfil the T criterion as set out in Annex XIII.
Overall conclusion
Combining all three criteria, it can be concluded that neither TBSI nor its degradation products is considered PBT or vPvB.
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