Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
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
Nanomaterial crystalline phase
Administrative data
- Endpoint:
- nanomaterial crystalline phase
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 016
- Report date:
- 2016
Materials and methods
- Type of method:
- x-ray diffraction (XRD)
- Details on methods and data evaluation:
- quantification of amorphous and crystalline phases in silica fume via spiking with alumina
Test material
- Specific details on test material used for the study:
- random silica fume samples from all 4 sites in Norway (Bremanger, Bjølvefossen, Thamshavn, Salten)
Results and discussion
Applicant's summary and conclusion
- Conclusions:
- The degree of amorphicity of silica fume lies between 96 and 99 %. Identified crystalline phases are considered impurities: silicon carbide, quartz, sodium chloride, elemental silicon, cristobalite, iron(III)oxide.
The nature of crystalline silica impurities in silica fume has already been addressed in the CSR (see Aqura report). It is important to point out that the amount of respirable crystalline silica (< 5 µm) is < 0.1 %.
Furthermore, although the chemical analysis shows silica content of e.g. < 87 %, the degree of amorphicity is still > 96 %. This means that the impurities are also incorporated in the amorphous silica matrix. - Executive summary:
A portion (~1g) of each sample was weighed in together with corundum standard (NIST SRM 676a), to make concentrations with ~10 wt% corundum, and then mixed with a polyamide ball in a Retsch MM400 mixer mill for 60 seconds at a frequency of 30 s-1.
The mixtures were analyzed using a D8 Advance XRD instrument, working at 40 kV and 40 mA with a Cu X-ray tube. The diffraction patterns were collected in continuous, locked coupled scan mode with a step size of 0.02° in the 2θ range 10° - 80°.
The spiking method entails that we add a known amount of a well-defined phase to our sample, in this case NIST corundum. Knowing its concentration allows the program to calculate the amorphous content in the original (unspiked) sample.
The quantitative results for the original, unspiked samples are presented in the table below:
sample deg of amorphicity (%) quartz (%) SiC (%) NaCl (%) Si (%) Cristobalite (%) Fe2O3 (%) Bjølvefossen 96,5 0,6 0,9 1 0,1 0,3 0,5 Bremanger 99,4 0,2 0,3 0,1 Thamshavn 98,7 0,3 0,7 0,1 0,1 Salten 99 0,2 0,4 0,1 0,2
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.