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EC number: 216-467-0 | CAS number: 1591-02-2
- 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
Endpoint summary
Administrative data
Description of key information
Additional information
Dibutoxy(dimethyl)silane is a liquid at standard temperature and pressure, with a measured melting point of -81.4±0.5°C at 1013 hPa, and a measured boiling point of 191.4±0.5°C at 1013 hPa . It has a predicted density of 0.87 g/cm3 at 20°C and a predicted vapour pressure of 30 Pa at 25°C.
The substance is not classified as a flammable liquid according to Regulation (EC) No. 1272/2008 on the basis of a measured flash point of 72°C and a measured boiling point of 191.4±0.5°C at 1013 hPa. It has a measured auto-ignition temperature of 210°C at 1013 hPa, and is not explosive and not oxidising on the basis of structural examination.
In contact with water, dibutoxy(dimethyl)silane reacts rapidly (half-life of 1.4 hours at pH 7 and 25°C, 0.59 hours at pH 9 and 25°C and <8 minutes at pH 4 and 19.6°C) to produce dimethylsilanediol and n-butanol according to the following equation:
C10H24O2Si + 2H2O → C2H8O2Si + 2C4H9OH
Therefore, requirements for testing of water-based physicochemical properties for the substance are waived on the basis of instability in water. The properties of the hydrolysis products, dimethylsilanediol and n-butanol, are assessed instead.
However, the physicochemical properties of the parent substance have been predicted using validated QSAR estimation methods. Dibutoxy(dimethyl)silane has a predicted log Kow value of 4.9 at 20°C and water solubility value of 9.4 mg/l at 20°C (predicted).
n-Butanol has a reported water solubility value of 7.7E+04 mg/l at 20°C, low log Kow (0.88) and vapour pressure of 560 Pa at 25°C (OECD 2001).
The saturation concentration in water of the silanol hydrolysis product, dimethylsilanediol, is limited by condensation reactions that can occur over time at loadings above approximately 1000 mg/l. However, it is very hydrophilic (calculated solubility is 1.0E+06 mg/l at 20°C using a QSAR method) and has a measured log Kow value of -0.38 ± 0.04 at 20.2± 0.3°C and log Kaw value of -6.94 ± 0.33 at 20.2± 0.3°C.
Dimethylsilanediol is not expected to be surface active and it has a predicted vapour pressure of 7 Pa at 25°C.
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