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Diss Factsheets
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EC number: 457-670-6 | CAS number: 157859-20-6
- 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
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Aquatic bioaccumulation [parent substance]: not relevant due to very rapid hydrolysis
Aquatic bioaccumulation [silanol hydrolysis product]: BCF values of 10-22 and 11-35 at two different test concentrations
Key value for chemical safety assessment
Additional information
In contact with water, tri(isopropyl)silyl acrylate reacts very rapidly by read-across from structural analogue; (half-life of <<1 h at pH 7 and 25°C) to produce tris(1-methylethyl)silanol and acrylic acid. Therefore, requirements for testing of bioaccumulation from water for the substance are waived on the basis of instability in water.
A study of bioconcentration in fish (C. carpio) using the MITI standard method is available for 1,3-dihydroxy-1,1,3,3-tetraisopropyldisiloxane. 1,3-Dihydroxy-1,1,3,3-tetraisopropyldisiloxane has some structural features in common with tris(1-methylethyl)silanol (silanol features and isopropyl groups attached to silicon atoms) and has similar physicochemical properties (molecular weight 278.54 g/mol and 174.36 g/mol respectively, water solubility 310 mg/l and 60 mg/l respectively). The tested substance, 1,3-dihydroxy-1,1,3,3-tetraisopropyldisiloxane has a log Kow of 5.4, yet the bioconcentration factor was found to be very low (BCF values 10-22 and 11-35 at two different test concentrations).
Tris(1-methylethyl)silanol has a lower log Kow of 3.9 so would be expected to have a lower bioconcentration factor than that of 1,3-dihydroxy-1,1,3,3-tetraisopropyldisiloxane.
For these reasons, the read-across is considered to be acceptable and conservative. While the study does have some methodological deficiencies (use of dispersant; no definite confirmation of steady state; no depuration period) the result is taken as indicative of low potential for tris(1-methylethyl)silanol to bioconcentrate in fish.
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