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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:
May 17, 2018
Reliability:
2 (reliable with restrictions)
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:
no
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
no
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Mass median aerodynamic diameter:
9.43 µm
Key result
Percentile:
D10
Mean:
1.4 µm
St. dev.:
0.01
Key result
Percentile:
D50
Mean:
4.8 µm
St. dev.:
0.01
Key result
Percentile:
D90
Mean:
15 µm
St. dev.:
0.01

1. Particle size distribution:

Two test series of 3 measurements each were performed with the test item.

Test series 1:

D10: 1.4 µm (Standard deviation: 0.01µm)

D50: 4.8 µm (Median diameter) (Standard deviation: 0.07 µm)

D90: 14.9 µm (Standard deviation: 0.20 µm)

Test series 2:

D10: 1.4 µm (Standard deviation: 0.01µm)

D50: 4.8 µm (Median diameter) (Standard deviation: 0.01 µm)

D90: 15.0 µm (Standard deviation: 0.04 µm)

Average:

D10: 1.4 µm (Standard deviation: 0.00 µm)

D50: 4.8 µm (Median diameter) (Standard deviation: 0.01 µm)

D90: 15.0 µm (Standard deviation: 0.01 µm)

2. Mass Median Aerodynamic Diameter:

The investigation of the test item by laser diffraction resulted in a volume median diameter (VMD) of 4.8 µm. An idealized shape factor of k =1 was used for the calculation of the MMAD. Combined with the density of 3.857 g/cm3 and shape factor K=1 for spheric particles, the MMAD was calculated to be 9.43 µm.

Conclusions:
The test item has a median particle size D50 equal to 4.8 µm and a MMAD of 9.43 µm.
Executive summary:

The particle size of the test item was determined according to OECD Guideline 110 and ISO 13320 (2009). The particle size distribution was determined using laser diffraction. The powder was brought via a powder dispersing cell into the laser light beam and the diffraction pattern was determined. From the diffraction pattern, the particle size distribution was calculated. The test item has a median particle size of D50 equal to 4.8 µm and a MMAD of 9.43 µm.

Description of key information

Key study: OECD 110 and ISO 13320. The test item has a median particle size of D50 equal to 4.8µm and a MMAD of 9.43 µm.

Additional information