What is Powder Shear Testing (Powder Flow)

 

With the term “good flowability” it usually is expressed that a powder or bulk solid is easily set to flow.

Products are characterized as “non-flowing” if they build up stable arches or pipes when discharged from a silo (figure 1), or if they are caking at storage or transport. The reason for the latter is the compressive strength (unconfined yield strength) of a bulk solid.