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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 December 2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Within this study, Microtrac S3500 equipment was used to perform full channel analysis of particle size distribution.
GLP compliance:
not specified
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Key result
Percentile:
D10
Mean:
0.974 µm
Remarks on result:
other: Average of 3 runs
Key result
Percentile:
D50
Mean:
5.17 µm
Remarks on result:
other: Average of 3 runs
Key result
Percentile:
D90
Mean:
11.89 µm
Remarks on result:
other: Average of 3 runs

Summary of results:

 Data  Value
 MV (µm)  6.20
 MN (µm)  0.489
 MA (µm)  2.482
 CS  2.417
 SD  4.12
 Mz  5.54
 si  4.32
 Ski  0.2617
 Kg  1.126

Percentiles:

 d(i)  d(µm)
 10 0.974
 20 2.074
 30 3.18
 40 4.20
 50 5.17
 60 6.18
 70 7.36
 80 8.95
 90 11.89
 95 15.49

-Summary of peak

 d(µm)  volume in %  Width
 5.17  100  8.24

 

Conclusions:
The d10, d50 and d90 of a representative sample of ytterbium(III) oxide were determined to be 0.974 μm, 5.17 µm, and 11.89 µm respectively.

Description of key information

Based on data obtained from a manufacturer (TIAG, 2017), the d10, d50 and d90 of a representative sample of ytterbium(III) oxide were determined to be 0.974 μm, 5.17 µm, and 11.89 µm, respectively. This study is considered as the key study for endpoint coverage.

Additional information

Note that all co-registrants provide particle size distribution information on their products in their individual dossiers.