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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:
07 August 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Version / remarks:
1981
Deviations:
not specified
Qualifier:
according to
Guideline:
EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
Version / remarks:
1996
Deviations:
not specified
Qualifier:
according to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
not specified
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Remarks:
The test item was sieved through a 2000 μm sieve before measurement. The coarse fraction was 23.8 wt.-% and the fine fraction 76.2 wt.-%.
Type of distribution:
volumetric distribution
Key result
Percentile:
D10
Mean:
6.5 µm
St. dev.:
0
Remarks on result:
other: Standard deviation was not determined as only two analyses conducted.
Key result
Percentile:
D50
Mean:
43.8 µm
St. dev.:
0
Remarks on result:
other: Standard deviation was not determined as only two analyses conducted.
Key result
Percentile:
D90
Mean:
142.3 µm
St. dev.:
0
Remarks on result:
other: Standard deviation was not determined as only two analyses conducted.
No.:
#1
Size:
> 2 000 µm
Distribution:
24 %
No.:
#2
Size:
< 2 000 µm
Distribution:
76 %

Table 1. Particle size results

 Test number

D10 (μm)

 D50 (μm)

 D90 (μm)

 1

 6.6

 44.1

 142.4

 2

 6.5

 43.5

 142.1

 Average

 6.5  43.8  142.3
Conclusions:
The test item contains a coarse fraction >2000 μm of 24%. The fine fraction (76 %) of the test item has a median particle size D50 of 44 μm, which was determined by laser diffraction measurement.
Executive summary:

The test item contains a coarse fraction >2000 μm of 24%. The fine fraction (76 %) of the test item has a median particle size D50 of 44 μm, which was determined by laser diffraction measurement. The D10 and D90 of the fine fraction were 6.5 and 142.3 μm, respectively. The study was conducted according to OECD Guideline 110 (1981) and ISO 13320 (2009) and is considered to be reliable without restriction (Klimisch 1). The study was not GLP-compliant, however the testing laboratory holds a GLP certificate.

Description of key information

The test item contains a coarse fraction >2000 μm of 24%. The fine fraction (76 %) of the test item has a median particle size D50 of 44 μm, which was determined by laser diffraction measurement. The D10 and D90 of the fine fraction were 6.5 and 142.3 μm, respectively.

Additional information

The test item contains a coarse fraction >2000 μm of 24%. The fine fraction (76 %) of the test item has a median particle size D50 of 44 μm, which was determined by laser diffraction measurement. The D10 and D90 of the fine fraction were 6.5 and 142.3 μm, respectively (2017). The study was conducted according to OECD Guideline 110 (1981) and ISO 13320 (2009) and is considered to be reliable without restriction (Klimisch 1). The study was not GLP-compliant, however the testing laboratory holds a GLP certificate.