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EC number: - | CAS number: -
Particle size distribution (Granulometry)
Administrative data
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 18 February - 17 April, 2009
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study has been performed according to ISO guidelines and according to GLP principles.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
- Report date:
- 2009
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: BS ISO 13320-1 : 1999
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
Reference
- Name:
- Unnamed
- Type:
- Constituent
- Details on test material:
- - Substance type: bright yellow powder
- Physical state: solid
- Stability under test conditions: stable up to 180°C; stable in water for at least 4 hours.
- Stability under storage conditions: stable
- Storage condition of test material: at room temperature in the dark
Results and discussion
Particle sizeopen allclose all
- Percentile:
- D50
- Mean:
- 28.794 µm
- Remarks on result:
- other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
- Percentile:
- D10
- Mean:
- < 3.889 µm
- St. dev.:
- 0.066
- Percentile:
- D50
- Mean:
- < 27.58 µm
- St. dev.:
- 0.438
- Percentile:
- D90
- Mean:
- < 160.799 µm
- St. dev.:
- 5.406
Any other information on results incl. tables
The sample proved to be insoluble, and well dispersed in 2- Propanol.
The method development phase of the analysis indicated that the most appropriate test and material parameters to obtain the optimum measurement were:
Dispersant : 2 -Propanol
Dispersion speed : 2000 rpm
Refractive index (sample) : 0.005 n
Absorption : 0.005 AU
Analysis Model : General Purpose (Normal)
Using the identified parameters, the particle size was analysed over the range 0.02 μm to 2000 μm.
Applicant's summary and conclusion
- Conclusions:
- The laser diffraction test conducted to determine the Particle size analysis produced the following results (in Average um):
Volume weighted mean: 64.414
Median (d.50): 27.580
Mode: 89.278
MMAD (Mass Median Aerodynamic Diameter): 28.794
10 % of material is <: 3.889
50 % of material is <: 27.580
90 % of material is <: 160.799
25.77% by volume of sample was seen to be < 10.00 μm.
The dry dispersion was found to be incompatible with the characteristic needles and fibres of the sample particles. As a result, reproducibility from dry analysis during method development was poor. Therefore the analysis was carried out using the ‘wet’, small volume dispersion system.
2-Propanol was selected as the most suitable dispersant.
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