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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018
Reliability:
1 (reliable without restriction)
Qualifier:
according to
Guideline:
other: ECHA (11/2012), Guidance on information requirements and chemical safety assessment, Chapter R.7a: Endpoint specific guidance section R.7.1.14 Granulometry, page 120-131.
Principles of method if other than guideline:
In general, the scattering of the incident light gives distinct pattern which are measured by a detector. This technique is particle property dependetnt – i.e. materIal has unique scattering and diffraction properties which are also particle size dependent. It is important to calibrate the instrumet with similar material (of the same size range as the material to be measured). Laser scattering techniques are suitable for geometric particles, vizspheres, cubes and monocrystals.
Particle size will be established optically.The MMAD can be calculated by means of a calculation correction.
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
ca. 5.5 µm
Percentile:
D10
Mean:
>= 1.44 µm
Remarks on result:
other: The determination result can be considered valid.
Percentile:
D50
Mean:
ca. 5.5 µm
Remarks on result:
other: The determination result can be considered valid.
Percentile:
D90
Mean:
ca. 11.52 µm
Remarks on result:
other: The determination result can be considered valid.
No.:
#1
Size:
>= 0.2 - <= 0.5 µm
Distribution:
ca. 0.1 %
No.:
#2
Size:
>= 0.5 - <= 1 µm
Distribution:
ca. 4.93 %
No.:
#3
Size:
>= 1 - <= 2 µm
Distribution:
ca. 10.5 %
No.:
#4
Size:
>= 2 - <= 5 µm
Distribution:
ca. 29.63 %
No.:
#5
Size:
>= 5 - <= 10 µm
Distribution:
ca. 38.35 %
No.:
#6
Size:
>= 10 - <= 15 µm
Distribution:
ca. 14.32 %
No.:
#7
Size:
>= 15 - <= 20 µm
Distribution:
ca. 2.07 %
No.:
#8
Size:
>= 20 - <= 37 µm
Distribution:
ca. 0.08 %
Conclusions:
Mass median diameter: 5.50 μm
Particle Size:
 D10: 1.44 μm
 D50: 5.50 μm
 D90: 11.52 μm
Particle size distribution at different passages:
 0.20 - 0.50 μm: 0.1%
 0.50 - 1.00 μm: 4.93%
 1.00 - 2.00 μm: 10.50%
 2.00 - 5.00 μm: 29.63%
 5.00 - 10.00 μm: 38.35%
 10.00 - 15.00 μm: 14.32%
 15.00 - 20.00 μm: 2.07%
 20.00 - 37.00 μm: 0.08%
 37.00 - 44.00 μm: 0.00%
 44.00 - 60.00 μm: 0.00%
 60.00 - 74.00 μm: 0.00 %
 74.00 - 149.00 μm: 0.00%
 149.00 - 200.00 μm: 0.00%

Description of key information

Mass median diameter: 5.50 μm

Particle Size:

 D10: 1.44 μm

 D50: 5.50 μm

 D90: 11.52 μm

Additional information