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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:
November 22 to November 29, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
The purpose of this study was the determination of the particle size distribution by laser diffraction of the test item. The study was performed according to the European Commission Regulation (EC) No. 440/2008 and under consideration of the following guidelines:
CIPAC MT 187: Particle Size Analysis by Laser Diffraction
ISO13320:2009: Particle Size Analysis - Laser Diffraction Methods
OECD Test Guideline 110: Particle Size Distribution
Guidance on information requirements and chemical safety assessment, Chapter R.7a: Endpoint specific guidance, version 4.1, October 2015, European Chemicals Agency
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
Laser scattering/diffraction
Type of particle tested:
agglomerate
Type of distribution:
mass based distribution
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Tribotecc Batch. No. S606078
Key result
Percentile:
D10
Mean:
ca. 1.5 µm
St. dev.:
0.01
Key result
Percentile:
D50
Mean:
ca. 3.6 µm
St. dev.:
0.01
Key result
Percentile:
D90
Mean:
ca. 7.4 µm
St. dev.:
0.03
No.:
#1
Size:
>= 1.53 - <= 1.54 µm
Distribution:
> 0 - <= 10 %
No.:
#2
Size:
>= 3.64 - <= 3.65 µm
Distribution:
> 0 - <= 50 %
No.:
#3
Size:
>= 7.4 - <= 7.44 µm
Distribution:
> 0 - <= 90 %

The test item consisted of agglomerated particles which were non-transparent.

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 barg). After passing the spectrometer 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.

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 = 3.64 µm

2ndtest series: L50 = 3.65 µm

The average of the median particle size L50was:

L50= 3.6 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 = 1.54 µm

2ndtest series: L10 = 1.53 µm

The average of the particle size L10was:

L10= 1.5 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 = 7.40 µm

2ndtest series: L90 = 7.44 µm

The average of the particle size L90was:

L90= 7.4 µm

The particle size distribution showed a monomodal distribution. The maximum was observed at approximately 4 µm.

Conclusions:
- The median particle size L50 of the test item deduced from the particle size distributions was 3.6 µm.
- The particle size L10 of the test item deduced from the particle size distributions was 1.5 µm.
- The particle size L90 of the test item deduced from the particle size distributions was 7.4 µm.

Description of key information

- The median particle size L50 of the test item deduced from the particle size distributions was 3.6 µm.

- The particle size L10 of the test item deduced from the particle size distributions was 1.5 µm.

- The particle size L90 of the test item deduced from the particle size distributions was 7.4 µm.

Additional information

Nanomaterials are not covered by the registration