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Physical & Chemical properties

Particle size distribution (Granulometry)

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Description of key information

Particle size distribution data indicates that SFL is potentially inhalable however testing to determine the dust generation potential of SFL as manufactured and supplied indicates that the inhalable fraction is <0.5 %w/w and hence inhalation of the substance as manufactured and supplied for use is unlikely.

Additional information

The particle size distribution data indicates that 95% of the sample of SFL tested had a particle size of < 29.42 µm and 5% had a particle size <1.4 µm. These data indicate that SFL is potentially inhalable, but that it is not a nanomaterial. Testing to determine the dust generation tendency ('dustiness') of SFL as manufactured and supplied (containing 27.75 %w/w water) has been performed according to DIN 55992 -1:2006 (Selck & Parr, 2010). The results of the study were as follows: total dustiness = 7.85 mg/g (0.785 %w/w); inhalable fraction 4.45 mg/g (0.445 %w/w); thoracic fraction 0.20mg/g (0.02 % w/w); and respirable fraction 0.01 mg/g (0.001 %w/w). Based on this study it is concluded that although the particle size distribution data indicates that SFL is potentially inhalable, exposure via this route during use of the substance in the form it is manufactured and supplied is unlikely as the inhalable fraction is expected to be < 0.5 %w/w.