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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:
2015-06-26 to 2015-06-26
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Qualifier:
according to
Guideline:
other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction
Qualifier:
according to
Guideline:
other: ISO 13320:2009: Particle Size Analysis - Laser Diffraction Methods
Deviations:
not specified
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
other: homogenous dispersion in distilled water
Type of distribution:
volumetric distribution
Percentile:
D50
Mean:
14.4 µm
St. dev.:
0.21
Remarks on result:
other: Individual results: 14.3 and 14.6 µm
Remarks:
each result consists of 3 independent runs
Percentile:
D10
Mean:
5.8 µm
St. dev.:
0
Remarks on result:
other: Individual results: 5.8 and 5.8 µm
Percentile:
D90
Mean:
27.5 µm
St. dev.:
0.42
Remarks on result:
other: individual results: 27.2 and 27.8 µm
No.:
#1
Size:
< 1 µm
Distribution:
0.93 %
Remarks on result:
other: individual results 0.91% and 0.94%
No.:
#2
Size:
< 10 µm
Distribution:
22.5 %
Remarks on result:
other: individual results: 21.95% and 22.96%

Multimodal distribution with a small shoulder at 1µm and a maximum at about 15µm.

By this study, particle size distribution was determined by laser diffraction technology. The study was conducted according to the european commision regulation EC 440/2008 under consideration of the guideline OECD 110, CIPAC MT 187 and ISO13320. The test samples were tested as they were delivered. There was no further milling or drying performed. The substance was applied as liquid dispersion in distilled water.2 independent tests were each with 3 measurements were run.

The median particle size D50 of the test item deduced from the particle size distributions was 14.4 µm. The particle size D10 of the test item deduced from the particle size distributions was 5.8 µm. The particle size D90 of the test item deduced from the particle size distributions was 27.5 µm. Small proportion (0.93%) has a particle size diameter < 1.0 µm.

Description of key information

Particle size distribution was determined by laser diffraction technology. The study was conducted according to the european commision regulation EC 440/2008 under consideration of the guideline OECD 110, CIPAC MT 187 and ISO13320. The test samples were tested as they were delivered. There was no further milling or drying performed. The substance was applied as liquid dispersion in distilled water.

The median particle size D50 of the test item deduced from the particle size distributions was 14.4 µm. 10% of all particles have a particle size diameter of < 5.8 µm, 90% of all particles have a diameter < 27.5 µm. Small proportion (0.93%) has a particle size diameter < 1.0 µm.

Additional information