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Physical & Chemical properties

Particle size distribution (Granulometry)

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Description of key information

The substance is placed on the market as solid pellets > 40 mg & > 4 mm diameter.  Dustiness testing was carried out and the potential to generate fine particles via abrasion was also assessed.
Dustiness test:
Total Dustiness (airborne fraction): 16.92 mg/g (experimental results; Parr, 2014).
Mass median aerodynamic diameter of airborne fraction: MMAD1 = 26.47 µm, MMAD2 = 31.61 µm (distribution fitted to cascade impactor data).
Geometric standard deviation of MMAD: GSD1 = 1.60, GSD2 = 4.95.
Fractional deposition in human respiratory tract (MPPD model, based on calculated MMAD):
Head (ET): 49.1 %
Tracheobronchial (TB): 0.3 %
Pulmonary (PU): 0.2 %
Abrasion test:
Total amount of abraded material:5.4 % of the starting material.
Total dustiness (airborne fraction) of the abraded fraction: 2.63 % based on the total amount of starting material.
Mass median aerodynamic diameter of airborne fraction: MMAD1 = 11.57 µm, MMAD 2 = 20.00 µm.
Geometric standard deviation of MMAD: GSD1 = 1.18, GSD2 = 4.54.
Fractional deposition in human respiratory tract (MPPD model, based on calculated MMAD):
Head (ET): 83.5 %,
Tracheobronchial (TB): 0.7 %,
Pulmonary (PU): 0.4 %.

Additional information

Substance as placed on the market: MMAD1 = 12.50 µm, MMAD2 = 29.09 µm and GSD1 = 4.09, GSD2 = 1.49.