Flowability

Flowability, also known as powder flow is a property that defines an ability of a powdered material to flow, related to cohesion.^[1]

Powder flowability depends on many traits:^[1]^[2]

the shape and size of the powder particles due to intermolecular force,
porosity
electrostatic activity
hygroscopy
bulk density
angle of repose
presence of glidants
oxidation rate (of a metallic powder)
humidity

ISO 4490:2018 norm (and its precedent, ISO 4490:2014) standardizes a method for determining the flow rate of metallic powders. It uses a normalized/calibrated funnel, named Hall flowmeter.^[3]

^ ^a ^b Karolina Szulc, Andrzej Lenart (2009). "WŁAŚCIWOŚCI KOHEZYJNE WYBRANYCH PROSZKÓW SPOŻYWCZYCH" [Cohesive properties of chosen edible powders] (PDF) (in Polish). Warsaw University of Life Sciences.
^ "Badanie własności proszków" [Examining properties of powders] (PDF) (in Polish).
^ "ISO 4490:2014". ISO. Retrieved 2022-11-21.

[yad-1] Karolina Szulc, Andrzej Lenart (2009). "WŁAŚCIWOŚCI KOHEZYJNE WYBRANYCH PROSZKÓW SPOŻYWCZYCH" [Cohesive properties of chosen edible powders] (PDF) (in Polish). Warsaw University of Life Sciences.

[2] "Badanie własności proszków" [Examining properties of powders] (PDF) (in Polish).

[3] "ISO 4490:2014". ISO. Retrieved 2022-11-21.

[1]

[2]

[3]