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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:
2017-09-28
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 B: Fibre Length and Diameter Distributions
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Key result
Percentile:
D50
Mean:
95.86 µm
Remarks on result:
other: no SD indicated
Key result
Percentile:
D10
Mean:
16.38 µm
Remarks on result:
other: no SD indicated
Key result
Percentile:
D90
Mean:
279.93 µm
Remarks on result:
other: no SD indicated

The test item consisted of transparent crystalline particles which appeared transparent and irregular shaped.

The particles were introduced to the analyser beam by the dry powder feeder by direct spraying through the measurement area. The powder was loosened by an integrated vibrator. The particles were dispersed and fed to the optical system by pressurized dry air (1.5 bar). After passing the

analyser beam the sample was collected in a vacuum cleaner.

After adjusting the laser, measuring the background and adjusting the correct particle concentration (obscuration) the measurement was started. The control software automatically performed three measurements. The average of these three measurements was given as result. Two test series of three measurements each were performed. The measurement time was 8 s.

For each test series fractions (left axis of the ordinate) and the siftings (right axis of the ordinate) are presented in percent by volume as a function of the particle size. Median values were calculated from unrounded values.

 

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:

1sttest series: L50= 95.55 μm

2ndtest series: L50= 96.17 μm

The average of the median particle size L50was: L50= 95.86 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:

1sttest series: L10= 16.30 μm

2ndtest series: L10=1 16.47 μm

The average of the particle size L10was: L10= 16.38 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:

1sttest series: L90= 281.08 µm

2ndtest series: L90= 278.78 µm

The average of the particle size L90was: L90= 279.93 μm

 

The particle size distribution showed a polymodal distribution. The maxima were observed at approximately 150 μm and s shoulder at approximately 5 µm.

Conclusions:
The median particle size L50 of the test item deduced from the particle size distributions was 95.86 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 L50of the test item deduced from the particle size distributions was 95.86 μm.

Description of key 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 L50of the test item deduced from the particle size distributions was 95.86 μm.

Additional information