Registration Dossier
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EC number: 279-075-9 | CAS number: 79135-28-7
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:
- August 22th 2019
- 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
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Version / remarks:
- 2009
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
- Version / remarks:
- 1996
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction
- Version / remarks:
- 2009
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Percentile:
- D10
- Mean:
- 16.2 µm
- St. dev.:
- 0.14
- Percentile:
- D50
- Mean:
- 171.5 µm
- St. dev.:
- 0.4
- Percentile:
- D90
- Mean:
- 573.5 µm
- St. dev.:
- 7.07
- Conclusions:
- The test item has a median particle size D50 = 171.5 µm, which was determined by laser light diffraction.
- Executive summary:
Test description: the test item is fed to the powder dispersing cell Scirocco 2000. The test item is loosened by the vibrator of the dispersing cell (60 %). From the dispersing cell the test item is fed to the measuring cell by pressurized air (2.0 barg). The concentration of the test item in the air flow is adjusted by the opening of the cell. An opening of 6 mm was used. The optical concentration in the measuring cell was adjusted to approx. 3 %. An additional sieve in the powder dispersing cell prevents that agglomerates are fed to the measuring cell. In the measuring cell the test item passes the laser beam. The particles diffract the laser light. The diffraction radius depends on the particle size. Small particles have a wide diffraction radius; big particles have a small one. The diffraction pattern of the laser light is measured by the detector of the particle analyzer.
From the measured diffraction pattern the particle size distribution is calculated.
The test item has a median particle size D50 = 171.5 µm, which was determined by laser diffraction measurement according to OECD guideline 110 (1981).
Reference
-Particle size distribution: two test series of 3 measurements each were performed with the test item.
Test series 1
| D10 | 16.3 µm | Standard deviation: 0.16 µm |
| D50 | 171.9 µm (Median diameter) | Standard deviation: 2.65 µm |
| D90 | 580.5 µm | Standard deviation: 30.16 µm |
Test series 2
| D10 | 16.0 µm | Standard deviation: 0.27 µm |
| D50 | 171.1 µm (Median diameter) | Standard deviation: 2.16 µm |
| D90 | 566.4 µm | Standard deviation: 10.94 µm |
In the graphs below on the left y-axis the fraction distribution and on the right y-axis the cumulative distribution is shown.
Description of key information
Test item has a median particle size D50 = 171.5 µm.
Additional information
Laser light diffraction.
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