Registration Dossier
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EC number: 231-975-2 | CAS number: 7783-03-1
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- N/A to 2009-05-08
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Version / remarks:
- 2009
- Principles of method if other than guideline:
- The particle size was analyzed by the Malvern MasterSizer LASER diffracter. This instrument is an ensemble analyzer that calculates a volume distribution from the LASER diffraction pattern of a cloud of particles. This raw scatter data is then processed using a complex algorithm and presented on the basis of an equivalent spherical diameter. This instrumentation is approved by ECHA Guidance, 2008 (Chapter R.7a, pg. 148)
- GLP compliance:
- not specified
- Type of method:
- Laser scattering/diffraction
- Type of particle tested:
- primary particle
- Type of distribution:
- volumetric distribution
- Specific details on test material used for the study:
- Identification: tungstic acid
Chemical formula: H2WO4
CAS No.: 7783-03-1
Sponsor: H.C. Starck Tungsten GmbH
Batch No.: TA17NF0054 - Key result
- Percentile:
- D10
- Mean:
- 1.3 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D50
- Mean:
- 7.93 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D90
- Mean:
- 13.2 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D10
- Mean:
- 0.11 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Key result
- Percentile:
- D50
- Mean:
- 0.19 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Key result
- Percentile:
- D90
- Mean:
- 0.53 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Conclusions:
- This tungstic acid registraion covers a highly pure (>99.9%) monoconstituent substance with a particle size distribution on the microsized region.
Reference
No specific standard deviation were identified for the particle distribution data although significant robust data was presented in the laboratory report.
The B.E.T. Surface Area of the test substance sample was determined to be 15.21 m^2/g.
Description of key information
Mean (based on volume) D10, D50, and D90 = 1.30, 7.93 and 13.20 um, respectively.
The specific surface area of the test substance sample (as determined by B.E.T.) was found to be 15.21 m2/g.
Additional information
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