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EC number: 200-899-1 | CAS number: 75-76-3
- 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
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Henry's Law Constant:
Calculated HLC at 12°C: 2.4E+5 Pa m3/mol
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 240 000
- at the temperature of:
- 12 °C
Additional information
The transfer of a substance from the water phase to the gas phase can be estimated by means of the Henry’s Law Constant. No measured value for this parameter is available for tetramethylsilane. The Henry’s Law Constant and the Kair-water can be estimated from the ratio of the vapour pressure to the water solubility (ECHA 2010, R16):
HLC = VP x MW/WS
Kair-water = HLC/R x T
Where:
HLC is the Henry’s Law constant in Pa m3/mol
VP is the vapour pressure in Pa at 285 K
MW is the molecular weight in g/mol
WS is the water solubility in mg/L at 285 K
R is the gas constant = 8.314 Pa m3mol-1K-1
T is the temperature at the air-water interface = 285 K
Kair-water is the air-water partitioning coefficient
Kair-water has been calculated for tetramethylsilane; the results are shown in Table 4.2.2 and indicate high volatilisation from water.
Table 4.2.2. Volatilisation of tetramethylsilane
Parameter (at 285 K) |
Tetramethylsilane |
||
VPa |
44700 |
||
MW |
88.23 |
||
WSb |
16.3 |
||
HLC |
242 000 |
||
Kair-water |
102 |
Notes:
a - Calculated from the vapour pressure of 79500 Pa at 20°C using the equation:
VP2 = VP1 x e((5000/R)x(1/T1 -1/T2))
b Calculated from the predicted water solubility of 19.6 mg/L at 25°C using the equation:
WS2 = WS1 x e((10000/R)x(1/T1 -1/T2))
The calculated Henry’s Law constant of 2.4E+5 Pa m3mol-1 at 12°C suggests that air will be the main compartment to which tetramethylsilane partitions. Testing for adsorption properties is technically not feasible due to the high volatility of the substance and its slight solubility in water. However, exposure of the aquatic compartment will be minimal.
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