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EC number: 274-572-7 | CAS number: 70331-94-1
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:
- 14 July 2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed in accordance with GLP to a recognised standard
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 13320:2009
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Mass median aerodynamic diameter:
- 6.817 µm
- Geometric standard deviation:
- >= 3.213 - <= 3.244
- Key result
- Percentile:
- D50
- Mean:
- 6.249 µm
- St. dev.:
- 1.3
- Key result
- Percentile:
- D10
- Mean:
- 1.188 µm
- St. dev.:
- 0.7
- Key result
- Percentile:
- D90
- Mean:
- 20.447 µm
- St. dev.:
- 1.3
- No.:
- #1
- Size:
- < 10 µm
- Distribution:
- 69.51 %
- Conclusions:
- 69.51 % by volume of sample was seen to be < 10.00 μm.
- Executive summary:
Test Objective: To characterise the particle size distribution of the powder. The analysis is conducted initially using a visual microscope and is then undertaken more formally using a Laser Diffraction Particle Size Analyser. The benefit of this procedure is that it allows the operator to obtain a better understanding of the particle characterisation of the material. This includes, but is not limited to, sample clusters and agglomerations which may provide false values in the formal particle size analysis. In these situations, where the operator can assess how easily these clusters or agglomerations are dispersed, ultrasonics may be employed. Owing to the extremely small quantities of material used in this analysis it should be noted that discrepancies can arise between the lower and upper limits of the particle size and the actual value obtained in the formal particle size analysis. The test is conducted in accordance with ISO 13320:2009 and CIPAC MT 187.
The results of the laser diffraction test conducted to determine the particle size of the sample are summarised in the table below. The analysis was conducted using the dry powder module (DPM).
Particle Size Analysis using dry powder module (DPM)
Average (μm)
Volume weighted mean
9.643
Median (d.50)
6.249
Mode
6.923
MMAD (Mass Median Aerodynamic Diameter)
6.817
10% of material is <
1.188
50% of material is <
6.249
90% of material is <
20.447
Volume of sample < 10.00 μm
69.51%
69.51 % by volume of sample was seen to be < 10.00 μm.
Reference
Full Test Results
|
RUN 1 |
RUN 2 |
RUN 3 |
RUN 4 |
RUN 5 |
**Average |
Volume weighted Mean |
9.480 |
9.711 |
9.810 |
9.429 |
9.786 |
9.643 |
Median (d.50) |
6.109 |
6.333 |
6.318 |
6.237 |
6.253 |
6.249 |
Mode (μm) |
6.768 |
7.017 |
7.002 |
6.925 |
6.909 |
6.923 |
*MMAD |
6.664 |
6.908 |
6.893 |
6.803 |
6.821 |
6.817 |
10% of material is < |
1.175 |
1.199 |
1.196 |
1.190 |
1.182 |
1.188 |
50% of material is < |
6.109 |
6.333 |
6.318 |
6.237 |
6.253 |
6.249 |
90% of material is < |
20.209 |
20.749 |
20.700 |
20.106 |
20.467 |
20.447 |
All results are in μm
*Mass Median Aerodynamic Diameter
**Average results is calculated from the entirety of data captured in each run and is not a simple arithmetic mean.
69.61% by volume of sample was seen to be < 10.00 μm.
Standard Deviation results
Run No. |
1 |
2 |
3 |
4 |
5 |
STDVP |
% STDVP |
d10 |
1.175 |
1.199 |
1.196 |
1.190 |
1.182 |
0.009 |
0.7 |
d50 |
6.109 |
6.333 |
6.318 |
6.237 |
6.253 |
0.079 |
1.3 |
d90 |
20.209 |
20.749 |
20.700 |
20.106 |
20.467 |
0.256 |
1.3 |
d15.78 |
1.888 |
1.952 |
1.954 |
1.941 |
1.934 |
0.024 |
1.2 |
GSD |
3.236 |
3.244 |
3.233 |
3.213 |
3.233 |
0.010 |
0.3 |
MMAD |
6.66 |
6.91 |
6.89 |
6.80 |
6.82 |
0.09 |
1.3 |
GSD = Geometric standard deviation
STDVP = standard deviation of the population
% STDVP = percentage standard deviation of the population
Coefficient of variation for d50 is less than 3%; d10 and d90 are less than 5%. Thus repeatability of the characteristic particles in the size distribution are within the acceptable limits as per the ISO 13320-1 test standard.
Description of key information
Key information obtained in a GLP accredited laboratory test.
69.51 % by volume of sample was seen to be < 10.00 μm.
Additional information
Test Objective: To characterise the particle size distribution of the powder. The analysis is conducted initially using a visual microscope and is then undertaken more formally using a Laser Diffraction Particle Size Analyser.
The analysis was conducted using the dry powder module (DPM).
69.51 % by volume of sample was seen to be < 10.00 μm.
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