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EC number: 262-553-6 | CAS number: 60996-20-5
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
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: This study does not follow normalised testing guideline and GLP, but was performed according to an acceptable method.
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Laser diffraction particle size analysis was applied on a dispersion of the powder in isopropanol. Six measurements were performed according to GRAN-99001 (internal method).
- GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001:2000 standard.
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Mass median aerodynamic diameter:
- 20.2 µm
- Percentile:
- D50
- Remarks on result:
- other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
- Percentile:
- D10
- Mean:
- 3.3 µm
- St. dev.:
- 0.06
- Percentile:
- D50
- Mean:
- 8.4 µm
- St. dev.:
- 0
- Percentile:
- D90
- Mean:
- 21.5 µm
- St. dev.:
- 0.9
- Conclusions:
- The mean D50 of potassium cryolite was found to be 8.4 µm.
- Executive summary:
Laser diffraction particle size analysis was applied on a dispersion of the powder in 2-butanol. Three measurements were performed.
The particle size distribution is summarised as follows:
Mean diameter
(μm)
D50
(μm)
D10
(μm)
D90
(μm)
MMAD
(μm)
Mean value
12.3
8.4
3.3
21.5
20.2
Standard deviation
0.3
<0.1
<0.1
0.9
0.4
Reference
The table below summarizes the individual results, the mean value and the standard deviation for the mean diameter, D50 (median), the D10 and D90 percentiles and the MMAD estimated by assuming that the particles are spherical.
|
Mean diameter (µm) |
D50 (µm) |
D10 (µm) |
D90 (µm) |
MMAD (µm) |
Trial 1 |
12.5 |
8.4 |
3.3 |
22.3 |
20.6 |
Trial 2 |
12.3 |
8.4 |
3.3 |
21.8 |
20.2 |
Trial 3 |
12.0 |
8.4 |
3.4 |
20.5 |
19.7 |
Mean value |
12.3 |
8.4 |
3.3 |
21.5 |
20.2 |
Standard deviation |
0.3 |
<0.1 |
<0.1 |
0.9 |
0.4 |
Description of key information
The mean D50 of potassium cryolite was found to be 8.4 µm.
Additional information
One reliable key study is available for this endpoint. Laser diffraction particle size analysis was applied on a dispersion of the powder in 2 -butanol. Six measurements were performed. The particle size distribution is summarised as follows:
|
Mean diameter (μm) |
D50 (μm) |
D10 (μm) |
D90 (μm) |
MMAD (μm) |
Mean value |
12.3 |
8.4 |
3.3 |
21.5 |
20.2 |
Standard deviation |
0.3 |
<0.1 |
<0.1 |
0.9 |
0.4 |
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