Registration Dossier
Registration Dossier
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EC number: 242-177-9 | CAS number: 18297-63-7
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- 1,3-bis(trimethylsilyl)urea
- Type of composition:
- boundary composition of the substance
- State / form:
- solid: particulate/powder
- Reference substance:
- 1,3-bis(trimethylsilyl)urea
- Name:
- 1,3-bis(trimethylsilyl)urea
- Type of composition:
- legal entity composition of the substance
- State / form:
- solid: particulate/powder
- Reference substance:
- 1,3-bis(trimethylsilyl)urea
- PBT status:
- the substance is not PBT / vPvB
- Justification:
The registered (parent) substance 1,3-bis(trimethylsilyl)urea (CAS No. 18297-63-7) is not PBT/vPvB based on ECHA guidance R.11 (ECHA, 2017).
Persistence Assessment
1,3-bis(trimethylsilyl)urea hydrolyses rapidly (DT50 < 10 min, OECD 111) to form the silanol hydrolysis products trimethylsilanol and urea. Therefore, the substance is not persistent (not P/vP).
Bioaccumulation Assessment
1,3-bis(trimethylsilyl)urea has a log Kow of 2.72 (OECD 117). Therefore, the substance does not meet the criteria for bioaccumulation (not B/vB).
Toxicity Assessment
Available short-term effect values for the aquatic toxicity to all three trophic levels and the available long-term effect value for algae are above the threshold value of the screening criteria (0.01 mg/L). Furthermore, the substance is not classified for mammalian toxicity. Therefore, the substance does not meet the screening criteria for T (not T).
Referenceopen allclose all
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