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EC number: 217-983-9 | CAS number: 2031-67-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
PBT AND VPVB ASSESSMENT
PBT/vPvB screening criteria have been used to assess whether the substance fulfils the PBT or vPvB criteria.
Persistence Assessment
Triethoxy(methyl)silane is expected to hydrolyse rapidly in contact with water to methylsilanetriol and ethanol (half-life approximately 5.5 hours at 20-25°C and pH 7). Therefore, the substance is not persistent. The hydrolysis product ethanol is readily biodegradable and therefore also not persistent. A reliable ready biodegradation study is available for a structurally-analogous substance, which indicates that no significant biodegradation is expected for the silanol hydrolysis product.
Bioaccumulation Assessment
Triethoxy(methyl)silane is expected to hydrolyse rapidly in contact with water to methylsilanetriol and ethanol (half-life approximately 5.5 hours at 20-25°C and pH 7). Therefore, the parent substance will not bioaccumulate. The hydrolysis products methylsilanetriol and ethanol have low log Kow values (<3) and, therefore, are not likely to bioaccumulate either. Therefore, the substance does not meet the criteria for bioaccumulation; it is not B and not vB.
Toxicity Assessment
The substance is not considered as T for the environment, since the lowest measured EC50 for the substance was >500 mg/l and the lowest predicted EC50 for the hydrolysis product was 2115 mg/l. Both do not meet the screening criteria for T for the environment (EC/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 it 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.
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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