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EC number: 835-272-7 | CAS number: 256374-76-2
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:
- 15/05/2015 to 27/05/2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Deviations:
- not specified
- Principles of method if other than guideline:
- The test is conducted in accordance with ISO 13320:2009 and CIPAC MT 187 and will take into consideration OECD guideline 110.
- GLP compliance:
- yes
- 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:
- No further details specified in the study report.
- Mass median aerodynamic diameter:
- 39.64 µm
- Geometric standard deviation:
- > 2.426 - < 2.452
- Key result
- Percentile:
- D10
- Mean:
- 11.456 µm
- St. dev.:
- 0.25
- Key result
- Percentile:
- D50
- Mean:
- 39.64 µm
- St. dev.:
- 0.547
- Key result
- Percentile:
- D90
- Mean:
- 251.695 µm
- St. dev.:
- 9.502
- Executive summary:
Due to the powder being agglomerated the analysis was carried out using the ‘wet’, small volume dispersion system. Several solvents were tried, in order to determine a suitable medium that provided maximum dispersibility, but with minimum solubility. Acetone was finally selected as the most suitable dispersant. The laser diffraction test conducted to determine the particle size analysis produced the following results:
Summary of results
Particle Size Analysis small volume (wet) module (SVW)
Average (µm)
Volume weighted mean
86.072
Median (d.50)
39.640
Mode
33.163
10% of material is <
11.456
50% of material is <
39.640
90% of material is <
251.695
By volume of sample was seen to be <10.00 µm
8.71%
Reference
Full Test Results
|
RUN 1 |
RUN 2 |
RUN 3 |
RUN 4 |
RUN 5 |
**Average |
Volume weighted mean |
90.948 |
84.117 |
84.232 |
84.819 |
86.247 |
86.072 |
Median (d.50) |
40.608 |
39.912 |
39.241 |
39.280 |
39.197 |
39.640 |
Mode (µm) |
33.311 |
33.210 |
33.258 |
33.119 |
32.922 |
33.163 |
10% of material is < |
11.833 |
11.625 |
11.374 |
11.260 |
11.146 |
11.456 |
50% of material is < |
40.608 |
39.912 |
39.241 |
39.280 |
39.197 |
39.640 |
90% of material is < |
268.800 |
242.875 |
245.473 |
246.470 |
255.593 |
251.695 |
All results are in µm
* Mass Median Aerodynamic Diameter
** Average result is calculated from the entirety of data captured in each run and is not a simple arithmetic mean.
8.71% by volume of sample was seen to be <10.00 µm.
Standard Deviation results
Run No. |
1 |
2 |
3 |
4 |
5 |
STDVP |
%STDVP |
d10 |
11.833 |
11.625 |
11.374 |
11.260 |
11.146 |
0.250 |
2.2 |
d50 |
40.608 |
39.912 |
39.241 |
39.280 |
39.197 |
0.547 |
1.4 |
d90 |
268.800 |
242.875 |
245.473 |
246.470 |
255.593 |
9.502 |
3.8 |
d15.78 |
16.638 |
16.395 |
16.175 |
16.089 |
15.986 |
0.233 |
1.4 |
GSD |
2.441 |
2.434 |
2.426 |
2.441 |
2.452 |
0.009 |
0.4 |
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
Summary of results
Particle Size Analysis small volume (wet) module (SVW) |
Average (µm) |
Median (d.50) |
39.640 |
By volume of sample was seen to be <10.00 µm |
8.71% |
Additional information
Due to the powder being agglomerated the analysis was carried out using the ‘wet’, small volume dispersion system. Several solvents were tried, in order to determine a suitable medium that provided maximum dispersibility, but with minimum solubility. Acetone was finally selected as the most suitable dispersant. The laser diffraction test conducted to determine the particle size analysis produced the following results:
Summary of results
Particle Size Analysis small volume (wet) module (SVW) |
Average (µm) |
Volume weighted mean |
86.072 |
Median (d.50) |
39.640 |
Mode |
33.163 |
10% of material is < |
11.456 |
50% of material is < |
39.640 |
90% of material is < |
251.695 |
By volume of sample was seen to be <10.00 µm |
8.71% |
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