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Physical & Chemical properties

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:
08 Nov 2017 to 15 Nov 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187
Principles of method if other than guideline:
The analysis was conducted initially using a visual microscope and was then undertaken more formally using a Laser Diffraction Particle Size Analyser. The sample was observed under 3 conditions: Direct observation, under a microscope with 32 x magnification, under a microscope with 400 x magnification. The physical characteristics of the material were recorded, noting such items as shape and size distribution. Following this the Malvern Mastersizer 2000 Laser Diffraction Analyser was used. Five runs of the method were conducted to ensure repeatability of results.
GLP compliance:
yes (incl. QA statement)
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
19.298 µm
Geometric standard deviation:
0.003
Remarks on result:
other: 28.79 % by volume of sample was seen to be < 10.00 µm
Percentile:
D10
Mean:
< 5.937 µm
St. dev.:
0.015
Remarks on result:
other: % STDVP 0.3
Percentile:
D50
Mean:
< 14.714 µm
St. dev.:
0.039
Remarks on result:
other: % STDVP 0.3
Percentile:
D90
Mean:
< 34.854 µm
St. dev.:
0.222
Remarks on result:
other: % STDVP 0.6

Standard visual observation:

Sample observed to be a fine white powder with some clusters.

Observation at 32 x magnification:

The particles appeared to be irregular shaped crystals. The smallest individual particle size was approximately

Observation at 400 x magnification:

The sample was observed to be made up of single crystalline particles.

Conclusions:
The mass median aerodynamic diameter was determined to be 19.298 um. 28.79 % by volume of sample was seen to be < 10.00 µm

Description of key information

The mass median aerodynamic diameter was determined to be 19.298 um. 28.79 % by volume of sample was seen to be < 10.00 µm

Additional information