Registration Dossier
Registration Dossier
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EC number: 810-490-5 | CAS number: 35501-23-6
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Persistence Assessment
N,N-Dibutylaminomethyl-triethoxysilan (CAS 35501-23-6) hydrolyse rapidly in contact with water to N,N-Dibutylaminomethyl-silantriol and ethanol (half-life < 2 minutes at 25°C and pH 4, 7, and 9), see report chapter 5.1.2 Hydrolysis.Therefore, the substance is not persistent.
A reliable ready biodegradation study is available, which indicates that the substance is not readily biodegradable. The hydrolysis substances are ethanol, which are readily biodegradable and N,N-Dibutylaminomethyl-silantriol. No significant biodegradation is expected for the silanol hydrolysis product. Therefore, this hydrolysis product meets the criteria for persistence (P).
Bioaccumulation Assessment
N,N-Dibutylaminomethyl-triethoxysilan (CAS 35501-23-6) hydrolyse rapidly in contact with water to N,N-Dibutylaminomethyl-silantriol and ethanol. Therefore, the parent substance will not bioaccumulate.
The hydrolysis product N,NDibutylaminomethyl-silanetriol has a predicted log Kow value of -0.21 (using KOWWIN v.1.68 (U.S. Environmental Protection Agency)). The calculated BCF of the hydrolysis product is 3,16 l/kg (using BCFBAF v3.01 (U.S. Environmental Protection Agency)) and so does not meet the screening criteria for B or vB. The hydrolysis product ethanol is readily biodegradable.
Therefore, the substance does not meet the criteria for bioaccumulation; it is not B and not vB.
Toxicity Assessment
There are no long-term data available to assess the substance according to the definitive criteria for T for the environment. Short term tests were conducted for invertebrates and algae. The substance is not considered as T for the environment as the available data (EC50 > 4.0 mg/l) do not meet the screening criteria for T for the environment (E/LC50 <0.1 mg/l).
The substance is not classified for specific target organ toxicity, carcinogenicity, mutagenicity or reproductive and developmental toxicity in mammals. The criteria for “T” based on mammalian effects are therefore not met.
Summary and overall Conclusions on PBT or vPvB Properties
The substance is expected to hydrolyse very rapidly in the presence of water and therefore the substance does not meet the criteria for PBT or vPvB. The hydrolysis product may persist in the environment but does not meet the criteria for B and T and therefore the hydrolysis product should not be concluded as PBT or vPvB.
Emission Characterisation
The emission characterisation is not considered as the substance is neither PBT nor vPvB.
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