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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

Administrative data

particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April 2016
1 (reliable without restriction)
Justification for type of information:
The determination was carried out using a procedure designed to be compatible with that given in European Commission Guidance Document EUR 20268 ‘Determination of Particle Size Distribution, Fibre Length and Diameter Distribution of Chemical Substances’ (2002).

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
other: according to Guidance Document EUR 20268
Version / remarks:
‘Determination of Particle Size Distribution, Fibre Length and Diameter Distribution of Chemical Substances’ (2002).
Principles of method if other than guideline:
Sieve Screening Test followed by Cascade Impactor :
First screening test : The sieve shaker table, on which the sieve rests, had an inclination of 4.5°, a nominal rotation speed of 2.5 rpm and vibrated at approximately 300 oscillations/min with an approximately 4 mm amplitude. Following the shaking period, the mass of the receiver pan and collected test item was recorded and the percentage of test item with a particle size less than 100 μm calculated.

Second part, cascade impactor : A Particles larger than the cut size of a stage, impact onto the collection plate and stay in the collection cup. Smaller particles follow the airstream and are carried to the next stage. In succeeding stages the nozzles are smaller, the air velocity is higher and finer particles are collected. In the final stage the smallest particles are collected on a glass fibre filter. The mass of the artificial throat, collection cups and filter were recorded before and after each determination. air flow enters the impactor through a throat and inlet tube and then accelerates through the multiple stages. At each stage one or more nozzles direct the particle-laden airstream into a collection cup.
GLP compliance:
yes (incl. QA statement)
Type of method:
cascade impaction
Type of particle tested:
primary particle
Type of distribution:
mass based distribution

Test material

Constituent 1
Chemical structure
Reference substance name:
EC Number:
Cas Number:
Molecular formula:
Test material form:
solid: particulate/powder
Details on test material:
White powder

Results and discussion

Particle size distribution at different passagesopen allclose all
< 100 µm
ca. 97.2 %
< 10 µm
ca. 2.2 %
< 5.5 µm
ca. 0.76 %

Any other information on results incl. tables

The results of the sieving procedure are :

Mass of test item transferred to sieve : 12.81 g

Mass of test item passed through sieve : 12.45 g

Percentage of test item less than 100 μm : 97.19 %

The results of the cascade impactor procedure are shown in the joint document WK38GS

Applicant's summary and conclusion

Conclusion and results :
Sampling for the cascade impactor determinations was performed by rolling the test item container for approximately 10 minutes then sampled from the top, middle and bottom. Too few particles were of a size less than 10.0 μm to allow accurate assessment of the mass median aerodynamic diameter. The inhalable fraction is defined as the mass fraction of particles which can be inhaled by nose or mouth, the thoracic fraction is defined as the mass fraction of particles that passes the larynx and the respirable fraction is defined as the mass fraction of particles that reaches the alveoli.