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Particle size distribution (Granulometry)

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particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February 19, 1991
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Principles of method if other than guideline:
The study was performed by the method of light diffraction.
GLP compliance:
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
13.8 µm
< 4 µm
2 %
Remarks on result:
other: average of two measurements.

Particle size distribution values as an average of two measurements are presented in the table below.

in μm
Mass percent
1.0 100.0
1.5 100.0
2.0 98.5
3.0 98.0
4.0 98.0
6.0 64.8
8.0 83.2
12.0 58.7
16.0 39.0
24.0 15.5
32.0 4.3
48.0 0.8
64.0 0.8
96.0 0.8
128.0 0.1
192.0 0.0
Median mass distribution diameter: 13.8 μm.
Executive summary:

The substance was tested for its particle size distribution by the light (laser) diffraction method. The diffraction pattern, produced after the passage of a laser beam through the suspension of the substance in hexane, was measured and analysed.

The percent mass above 400 μm diameter is 0 %, while the one below 4 μm diameter is 2 %; the median mass distribution diameter resulted to be 13.8 μm.


The median mass distribution diameter is 13.8 μm.

Description of key information

Median mass distribution diameter: 13.8 μm.

Additional information

Light (laser) diffraction method.