Registration Dossier
Registration Dossier
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EC number: 232-219-4 | CAS number: 7790-75-2
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:
- 2018-02-19
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
- Version / remarks:
- 1981
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Version / remarks:
- 2009
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2017-02-28
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Specific details on test material used for the study:
- Storage conditions: Ambient temperature, dry, tightly closed in original container
- Remarks on result:
- not measured/tested
- Percentile:
- D10
- Mean:
- 2.5 µm
- St. dev.:
- 0.7
- Percentile:
- D50
- Mean:
- 6.1 µm
- St. dev.:
- 0.07
- Percentile:
- D90
- Mean:
- 11.1 µm
- St. dev.:
- 0.21
- Conclusions:
- The test item calcium wolframate has a median particle size D50 = 6 µm, which was determined by laser diffraction measurement in accordance to inter alia ISO 13320 (2009) and CIPAC MT 187 (2009) method.
Reference
Two test series of 3 measurements each were performed with the test item. On the left y-axis the fraction distribution and on the right y-axis the cumulative distribution is shown.
Test serie 1:
D10: 2.6 µm
D50: 6.2 µm (Median diameter)
D90: 11.3 µm
Test serie 2:
D10: 2.5 µm
D50: 6.1 µm (Median diameter)
D90: 11.0 µm
Average
D10: 2.5 µm
D50: 6.1 µm (Median diameter)
D90: 11.1 µm
Description of key information
The test item calcium wolframate has a median particle size D50 = 6 µm, which was determined by laser diffraction measurement in accordance to inter alia ISO 13320 (2009) and CIPAC MT 187 (2009) method.
Additional information
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