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Diss Factsheets
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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
- 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 hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
The conclusions apply to high-grade purity silica fume. (as presented in section 1.2: Composition of the substance). Heavy metal and organic impurities present in lower grades of silica fume may have remarkable effects relevant for the soil compartment. These contaminants must be dealt with separately by producers and importers and evaluated on a case-by-case basis, according to presented information regarding specific products/batches and uses. Companies should have regular control over the levels of hazardous impurities and update the RMM, MSD and CSA accordingly. For silica fume, the impurities present in the substances rather than the Si need consideration if exposure to soil takes place. The amount and quality of the impurities vary between the raw materials, processes and factories. In estimating the hazard and risks involved in these metals or other impurities, the read-across method may be utilized on a case-by-case basis by applying the already existing hazard data and PNEC soil values applicable to these metals and other elements.
Conclusion on classification
Proposed preliminary classifications for Silica Fume grades (1 HG and 2 LG). For details on the grades, please see the substance identification and compositional data.
1. Silica Fume, high grade No environmental classification is proposed for Silica fume, high grade.
2. Silica Fume, low grade
Preliminary Environmental Classification is proposed for Silica fume, low grade (see proposal and justification below).
CLP classification for LG
According to Annex IV of the Guidance on the Application of the CLP Criteria, where data from dissolution protocol is available, then the results should be used to aid classification according to the rules given in the Guidance to Regulation (EC) No 1272/2008 on the classification, labelling and packaging of substances and mixtures, (ECHA-09-G-02-EN) (CLP (2009)).
We can consider the dissolved Zn concentration of silica fume LG (311-468 µg/l) after a 24 hr T/D test at the high loading rate (100 mg/l). The Zn L(E)C50 values are lower (0.07-0.86 mg/l forDaphnia magnaref: EU ERA Zn- final - May 2008) than the Zn concentration and, following the given rules for classification, the LG silica fume needs to be classified in the Aquatic Acute 3/Aquatic Chronic 2 or 3 Category. Long term Daphnia is ongoing so as to validate or not the above conclusions.
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