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Physical & Chemical properties

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:
2021-02-09
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)
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
agglomerate
Type of distribution:
volumetric distribution
Percentile:
D10
Mean:
>= 20 - <= 22 µm
Remarks on result:
other: St. dev. not determined
Key result
Percentile:
D50
Mean:
>= 56 - <= 77 µm
Remarks on result:
other: st. dev. not determined.
Percentile:
D90
Mean:
>= 145 - <= 218 µm
Remarks on result:
other: st. dev. not determined.

The median particle size L50 (D (v, 0.5): 50 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L50 = 56.8 μm


2nd test series: L50 = 77.0 μm


The average of the median particle size L50 was: L50 = 56 – 77 μm


 


The particle size L10 (D (v, 0.1 ): 10 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L10 = 20.1 μm


2nd test series: L10 = 21.7 μm


The average of the particle size L10 was: L10 = 20 - 22 μm


 


The particle size L90 (D (v, 0.9): 90 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:


1st test series: L90 = 145.9 μm


2nd test series: L90 = 218.4 μm


The average of the particle size L90 was: L90 = 145 - 218 μm


 


The test item showed a significant deviation between the first and the second measurement. Under the microscope the test item showed crystalline needles. Depending on the orientation of each needle in relation to the light beam different sizes are observed. Furthermore, this test item also showed needles of different sizes. These combined effects could have led to the significant deviation observed during the measurements. Thus, the averages were provided as ranges.


 


The maximum was observed at between 60 and 100 μm. Additionally shoulders were observed at approximately 5 μm and 700 μm.

Conclusions:
The median particle size L50 of the test item deduced from the particle size distributions was 56 – 77 μm.
Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was 56 – 77 μm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was 56 – 77 μm.

Additional information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was 56 – 77 μm.