Registration Dossier
Registration Dossier
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EC number: 201-081-7 | CAS number: 78-08-0
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- RECONSILE triethoxy(vinyl)silane 000078-08-0
- Type of composition:
- boundary composition of the substance
- State / form:
- liquid
- Reference substance:
- RECONSILE triethoxy(vinyl)silane 000078-08-0
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Persistence Assessment
Triethoxy(vinyl)silane (CAS 78-08-0) hydrolyses rapidly in contact with water (predicted half-life approximately 0.9 h at 20-25°C and pH 7), to form the hydrolysis products vinylsilanetriol and ethanol. Therefore, the parent substance is not persistent (not P/vP).
Bioaccumulation Assessment
The parent substance has a log Kow of 3 (QSAR) and therefore does meet the screening criteria for bioaccumulation (log Kow > 2.0). However, triethoxy(vinyl)silane (CAS 78-08-0) is expected to hydrolyse rapidly in contact with water (predicted half-life of 0.9 h at 20-25°C and pH 7), thus the hydrolysis products vinylsilanetriol and ethanol are relevant for the assessment. The hydrolysis products have low log Kow values (<3) and, therefore, are unlikely to bioaccumulate.
Hence, the substance does not meet the criteria for bioaccumulation; it is not B and not vB.
Toxicity Assessment
No acute and chronic aquatic data is available for the target substance triethoxy(vinyl)silane. Since the target substance rapidly hydrolysis in the aquatic environment to the hydrolysis products vinylsilanetriol and ethanol (DT50 = 0.9 h at 20-25°C and pH 7, QSAR). Based on ECHA guidance R.16 (ECHA, 2016), the breakdown products rather than the parent substance should be assessed for aquatic toxicity when the hydrolysis half-life is below 12 h. Thus, a read-across to a structural analogue substance trimethoxy(vinyl)silane (CAS No. 2768-02-7) was conducted, which rapidly hydrolyses in the aquatic environment (DT50 = 0.1 h at 20 -25 °C and pH 7, QSAR) to form the same silanol hydrolysis product vinylsilanetriol as the target substance and the alcohol hydrolysis product methanol instead of ethanol. For the source substance trimethoxy(vinyl)silane (CAS No. 2768-02-7) a NOEC of 28.1 mg/L (measured TWA, OECD 211) was obtained and no short-term effects were observed in all three trophic levels (fish, aquatic invertebrates, algae) (LC/EC50 > 100 mg/L). Therefore, the screening criteria according to Annex XIII of the REACH regulation EC 1907/2006 were not met (NOEC ≥ 0.01 mg/L) and the substance is not classified as T.
Furthermore, neither the substance nor its hydrolysis products are classified for specific target organ toxicity, carcinogenicity, mutagenicity and is not toxic for reproduction and development towards mammals. The criteria for “T” based on mammalian effects are therefore not met.
In conclusion, based on ECHA guidance R.11, the substance does not meet the overall criteria for PBT or vPvB.
Reference
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.
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