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Permeability and de-aeration rate of common materials used in bulk solids handling

Including portland cement, coal, iron powder, PVC, wheat flour

Question or remark ? Please contact us at powder.process@protonmail.com


1. Data table


Note : orders of magnitude only, of course variying depending on the actual specification of materials

Material Compaction in % Permeability in m3.s/kg*10-6 Vibrated deaeration rate in m/s*10-3
Alumina – sandy 17 0.42 19
Barytes 43 0.48 3.9
Cement – Ordinary Portland 40 0.71 3
Coal – granular


As supplied 14 42 24
Degraded 36 1 2.9
Pulverized 31 0.53 4.3
Copper concentrate 30 0.33 9.8
Fly ash – fine 49 0.6 2
Iron powder 34 0.34 7
Magnesium sulphate 29 6.3 17


Pearlite 30 5.7 8.8
Polyethylene – pellets 5 420 60
Potassium chloride 16 11 26
Potassium sulphate 17 0.99 18
PVC – powder 22 1.2 8
Silica sand 12 3.9 34
Sugar – granulated


Fresh 10 20 13
Degraded 43 1.4 8.3
Wheat flour 37 1.3 6.2
Zircon sand 15 1.3 10

Source : Pneumatic conveying design guide, Mills