Registration Dossier
Registration Dossier
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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.
Nanomaterial dustiness
Administrative data
- Endpoint:
- nanomaterial dustiness
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
- Report date:
- 2009
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EN 15051 (Workplace atmospheres - Measurement of the dustiness of bulk materials - Requirements and reference test methods)
- Deviations:
- yes
- Remarks:
- EN15051 collects inhalable, thoracid and respirable dust fraction on a filter substrate for subsequent analysis. Here, airborne nanoparticles were measured in-situ using Condensation Particle Counter and Scanning Mobility Particle Sizer.
- GLP compliance:
- not specified
- Type of method:
- continuous drop
Test material
- Specific details on test material used for the study:
- 2 different silica fume samples were analysed: silica fume low grade and silica fume high grade (see CoA)
Results and discussion
Applicant's summary and conclusion
- Conclusions:
- Both products show particle number concentrations well below this threshold, thus their dust re-leasing behaviour can be declared as „does not release nanoparticles“.
- Executive summary:
In order to interpret the nanoscaled dustiness an empirical significance criterium was defined by IGF.
„Only dustiness numbers above a particle number concentration ≥ 1500 particles/cm³ (NOT blank corrected) and at least a blank corrected number concentration two times as high as the respective background concentration is regarded as significant.“
Both products show particle number concentrations well below this threshold, thus their dust re-leasing behaviour can be declared as „does not release nanoparticles“.
When the experiments would be performed in real aerosol background concentrations the product-generated nanoparticles would not be detectable.
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