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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:
14 September 2016 - 11 May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Deviations:
yes
Remarks:
The preliminary test was not performed as the particle size was clearly lower than 1 mm.
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: NFX11-507 (1989)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187 CIPAC Handbook K (2003)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
The particle size distribution determination using the CIPAC MT187 method did not follow the GLP principles.
Type of method:
other: both sieving and laser diffraction methods were used
Type of distribution:
other: volumetric and counted distributions were given
Remarks on result:
other: The results are summarised underneath
Key result
Percentile:
D10
Mean:
0.271 µm
Remarks on result:
other: number based distribution
Key result
Percentile:
D50
Mean:
0.424 µm
Remarks on result:
other: number based distribution
Key result
Percentile:
D90
Mean:
0.978 µm
Remarks on result:
other: number based distribution
Key result
Percentile:
D10
Mean:
1.45 µm
St. dev.:
0.045
Remarks on result:
other: volumetric distribution
Key result
Percentile:
D50
Mean:
5.76 µm
St. dev.:
0.181
Remarks on result:
other: volumetric distribution
Key result
Percentile:
D90
Mean:
12.8 µm
St. dev.:
0.532
Remarks on result:
other: volumetric distribution
No.:
#1
Size:
250 µm
Distribution:
99.9 %
No.:
#2
Size:
180 µm
Distribution:
99.7 %
No.:
#3
Size:
125 µm
Distribution:
99.6 %
No.:
#4
Size:
100 µm
Distribution:
99.5 %
No.:
#5
Size:
90 µm
Distribution:
98.9 %
No.:
#6
Size:
63 µm
Distribution:
98.8 %
No.:
#7
Size:
45 µm
Distribution:
98.7 %
No.:
#8
Size:
32 µm
Distribution:
96.6 %
No.:
#9
Size:
25 µm
Distribution:
75.7 %
No.:
#10
Size:
20 µm
Distribution:
12.6 %

Particle size distribution (OECD 110, ISO 13320-1:1999, NFX11-507)

It was shown that the majority of particles (96.6%) had a size lower than 32 µm. The cumulated undersize particle fractions per sieve are summarised in the table above. No loss of mass was recorded. The highest aperture size through which 100% of the particles passed was 355 µm.

Particle size distribution by laser diffraction (CIPAC MT 187)

The particle size distribution of the test item in volume was found to range approximately from 0.276 µm to 86.4 µm.  The mean diameter in volume was 6.68 µm.

The particle size distribution of the test item in number was found to range approximately from 0.243 µm to 14.5 µm.

Conclusions:
The particle size distribution was determined by sieving according to OECD 110, ISO 13320-1:1999, NFX11-507 guidelines and by laser diffraction using the CIPAC MT 187 method. It was shown that the majority of particles (96.6%) had a size lower than 32 µm. The particle size distribution of the test item in volume and number were found to range approximately from 0.276 µm to 86.4 µm and 0.243 µm to 14.5 µm, respectively. The mean diameter in volume was 6.68 µm, and D10, D50 and D90 were determined to be 1.45 µm, 5.76 µm and 12.8 µm, respectively. The particle size distribution of the test item in number was found to range approximately from 0.243 µm to 14.5 µm, and D10, D50 and D90 were determined to be 0.271 µm, 0.424 µm and 0.978 µm, respectively.

Description of key information

The particle size distribution was determined according to OECD 110, ISO 13320 -1:1999, NFX11-507 guidelines (conform GLP) and by laser diffraction using the CIPAC MT 187 method (not conform GLP) (K1, Demangel, 2017).

It was shown that the majority of particles (96.6%) had a size lower than 32 µm. The particle size distribution of the test item in volume determined by laser diffraction was found to range approximately from 0.276 µm to 86.4 µm.  The mean diameter in volume dv was 6.68 µm and D10, D50 and D90 were determined to be 1.45 µm, 5.76 µm and 12.8 µm respectively. The particle size distribution of the test item in number was found to range approximately from 0.243 µm to 14.5 µm and D10, D50 and D90 were determined to be 0.271 µm, 0.424 µm and 0.978 µm respectively.

Additional information