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EC number: 201-251-0 | CAS number: 80-10-4
- 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
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.009 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.09 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.001 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 0.09 mg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 74 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.122 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.012 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.019 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
KEY PARAMETERS FOR CLASSIFICATION
The registered (parent) substance dichloro(diphenyl)silane (CAS 80-10-4) hydrolyses rapidly in contact with water under environmentally relevant conditions. Therefore, the environmental hazard and risk assessment is based on the silanol hydrolysis product, i.e. diphenylsilanediol (CAS 947-42-2) and a structural analogue to the parent compound trichloro(phenyl)silane (CAS 98-13-5), which just like the parent compound hydrolyses quickly to a silanol and hydrochloric acid. Hydrochloric acid, generally shows a pH-dependent environmental hazard profile, which is considered a sufficiently manageable risk when appropriate measures are in place (OECD, 2002), thus it is not expected to affect the environmental hazard profile of the parent substance.
Abiotic degradation - Hydrolysis
DT50 = 10 sec (1.5 °C and pH 7, OECD 111)
Biodegradation in water
Not readily biodegradable (1% in 28 d, OECD 310, RA CAS 98-13-5)
Bioaccumulation
log Kow (silanol hydrolysis product) = 2.0 (20°C, QSAR)
Aquatic acute toxicity
Fish
LC50 (96 h) = 39 mg/L (measured arithmetic mean, Oncorhynchus mykiss, OECD 203, RA CAS 947-42-2)
Aquatic invertebrates
EC50 (48 h) = 24 mg/L (measured arithmetic mean, Daphnia magna, OECD 202, RA CAS 947-42-2)
Aquatic algae
ErC50 (72 h) = 9 mg/L (measured arithmetic mean, Pseudokirchneriella subcapitata, OECD 201, RA CAS 947-42-2)
Aquatic chronic toxicity
Aquatic algae
ErC10 (72 h) = 1.1 mg/L (measured arithmetic mean, Pseudokirchneriella subcapitata, OECD 201,RA CAS 947-42-2)
Classification according to CLP
Dichloro(diphenyl)silane (CAS 80-10-4) hydrolyses rapidly under environmental conditions (DT50 = 10 sec, at pH 7 and 1.5 °C) to form the hydrolysis products diphenylsilanediol and hydrochloric acid. The silanol hydrolysis product is not considered to be readily biodegradable and the second hydrolysis product is an inorganic substance, thus not susceptible to biodegradation. Acute toxicity data for the silanol hydrolysis product are available for all three trophic levels (fish, aquatic invertebrates, algae). The lowest L(E)C50 effect was observed in algae with 9 mg/L. On this basis, the parent substance dichloro(diphenyl)silane (CAS 80-10-4) needs to be classified as chronic 2 according to the Regulation (EC) No.1272/2008 and further amendments (ATPs).
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