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EC number: 235-243-3 | CAS number: 12138-09-9
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- 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
- 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. QA statement)
- 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 %
- 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.
Reference
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.
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
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