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Physical & Chemical properties

Particle size distribution (Granulometry)

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Description of key information

The particle size of the sample of the test material was determined by cascade impaction according to Commission Technical Guidance Document "Particle Size Distribution, Fibre Length and Diameter Distribution" of June 1996. The average particle size was found to be >100μm, since only 11.5% had a particle size of < 100 µm.

Additional information

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.

The results are as follows:

Measurement

Method

Result

Proportion of test material having an inhalable particle size less than 100 µm

Sieve

11.5%

Proportion of test material having a thoracic particle size less than 10.0 µm

Cascade Impactor

3.87%

Proportion of test material having a respirable particle size less than 5.5 µm

Cascade Impactor

0.525%