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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187: Particle size analysis by laser diffraction, Handbook K. 2007.
Deviations:
no
GLP compliance:
yes
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
Mass median aerodynamic diameter:
180 µm
Geometric standard deviation:
1.965
Percentile:
D10
Mean:
69.9 µm
St. dev.:
0.602
Percentile:
D50
Mean:
155 µm
St. dev.:
1.55
Percentile:
D90
Mean:
314 µm
St. dev.:
9.81

2 -propanol was identified as a suitable dispersant, as the substance visually did not dissolve, and because it was homogeneous with no tendancy for agglomerate formation.

Test Results:

 

Run 1

Run 2

Run 3

Run 4

Run 5

Mean

STDVP

%STDVP

Volume weighted mean

179

174

178

172

172

175

3.45

1.97

Mode

159

160

160

164

158

160

2.16

1.35

D10 (10% of material is <)

70.9

69.8

69.8

69.8

69.2

69.9

0.602

0.860

D50 (50% of material is <)

157

154

156

154

153

155

1.55

1

D90 (90% of material is <)

325

311

323

303

307

314

9.81

3.13

GSD

1.975

1.960

1.984

1.943

1.964

1.965

0.016

0.791

MMAD

180

GSD: geometric standard deviation of the lognormal particle size distribution

MMAD: mass median aerodynamic diameter

Mean: Calculated from the entirety of the data captured in each run and not a simple arithmetic mean

STDVP: standard deviation of the population

%STDVP: percentage standard deviation of the population

The coefficient of variation for d50 is less than 3%, d10 and d90 are less than 5%. Smaller particles sizes between 1 and 10 μm were observed with a total volume of less than 0.15%. It can be concluded that the repeatability of the characteristic particles in the size distribution are within the acceptable limits.

Conclusions:
The particle size distribution of the test item was determined by means of Laser Diffraction Analysis using the medium volume (wet) module (MVM). The D50 of the test item was determined to be 155 μm, the D10 was 69.9 μm and the D90 was 314 μm. The MMAD of the test item was calculated to be 180 μm.

Description of key information

The particle size distribution of the test item was determined by means of Laser Diffraction Analysis using the medium volume (wet) module (MVM). The D50 of the test item was determined to be 155 μm, the D10 was 69.9 μm and the D90 was 314 μm. The MMAD of the test item was calculated to be 180 μm.

Additional information