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Diss Factsheets
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EC number: 232-263-4 | CAS number: 7803-62-5
- 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:
- no data available: testing technically not feasible
Marine water
- Hazard assessment conclusion:
- no data available: testing technically not feasible
STP
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (freshwater)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (marine water)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
The registered substance, silane (CAS 7803-62-5; EC No. 232-263-4), is a pyrophoric gas with a low molecular weight (32.12 g/mol), which is unstable in contact with water and moisture.
No data are available for hydrolysis rates, water solubility or partition coefficient.
It is not possible to conduct physicochemical or ecotoxicity studies with silane due to testing being technically not feasible for a pyrophoric gas. Consequently, it is not possible to calculate PNECs for the aquatic or terrestrial compartments because no data are available for toxicity to aquatic or terrestrial organisms.
Quantitative risk assessment for the environment is not possible and no predicted environmental concentrations (PECs) have been derived (see Sections 9 and 10 of the CSR). Qualitative risk characterisation for the environment has been conducted: the physicochemical hazards associated with the substance mean that all aspects of silane production and handling are subject to highly controlled conditions. Processes using silane are by necessity dry processes using high levels of containment. No measured data are available for releases of silane to air and wastewater from the production site due to the highly controlled use pattern and the high reactivity of the substance with water and oxygen in air.
Subsequently, releases to the environment are minimised, and there are no direct releases of silane to water or soil. Deposition of air-borne substance may in theory occur but, due to the extremely volatile and reactive nature of the substance, this is expected to be minimal.
Additionally, the substance is reactive in contact with air and water, forming hydrogen and silicic acid or hydrated silicon dioxide. These are naturally occurring substances for which no concern for the environment is expected.
It can therefore be concluded that silane presents a low risk to the environment.
Conclusion on classification
It is proposed that silane should not be classified in the EU for acute or chronic toxicity on the grounds that there are no suitable data available. Testing is technically not feasible because the substance is a pyrophoric gas. The concentration of silane in water is not expected to be significant due to the high volatility and reactivity of the substance and its handling under highly controlled conditions.
According to Regulation (EC) No 1272/2008 (CLP):
Aquatic Acute: Not classified
Aquatic Chronic: Not Classified
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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