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Diss Factsheets
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EC number: 240-816-6 | CAS number: 16753-62-1
- 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
Dimethoxy(methyl)vinylsilane is a liquid at standard temperature and pressure, with a measured melting point of <-100°C, and a measured boiling point of 103.9°C. It has a measured relative density of 0.89 at 20°C, a measured kinematic viscosity of 0.51 mm2/s at 20°C and measured vapour pressure values of approximately 3000 Pa, 5400 Pa, 9200 Pa and 15000 Pa at 20°C, 30°C, 40°C and 50°C, respectively.
The substance is classified as a highly flammable liquid according to Regulation (EC) No 1272/2008 on the basis of a measured flash point of 5°C and a measured boiling point of 103.9°C. It has a measured self-ignition temperature of 240°C, and is not explosive and not oxidising on the basis of chemical structure.
In contact with water dimethoxy(methyl)vinylsilane reacts rapidly (half-life of 18.3 min at pH 7, <<2 min at pH 4, 0.7 min at pH 9 and 25°C) to produce methylvinylsilanediol and methanol according to the following equation:
CH3Si(OCH3)2CH=CH2 + 2H2O → CH3Si(OH)2CH=CH2 + 2CH3OH
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 product, methylvinylsilanediol, are assessed instead. Methanol is miscible with water, has low log Kow (-0.82 to -0.64) and high vapour pressure (12790 Pa at 20°C) (OECD, 2004a: SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18 - 20 October 2004, Methanol, CAS 67-56-1).
The saturation concentration of the hydrolysis product, methylvinylsilanediol in water is limited by condensation reactions to approximately 700 mg/l. However, it is very hydrophilic (calculated solubility is 5.0E+05 mg/l using a QSAR method) and has a low log Kow (-0.1, predicted).
The hydrolysis product is not expected to be surface active. It is much less volatile than the parent substance (vapour pressure = 2.1 Pa at 25°C, predicted).
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