Pharmaceutical Testing
Powders: Flowability
Flow Properties & Angle of Repose Flow Property
Angle of Repose
Excellent
25 - 30
Good
31 - 35
Fair - aid not needed
36 - 40
Passable - may hang up
41 - 45
Poor - must agitate, vibrate
46 - 55
Very poor
56 - 65
Very, very poor
> 66
3. Shear Cell Measures the force required to shear a circular disk through a prepared sample of bulk material. It comprises 2 stages: (a) Sample consolidation (bulk density measurement) (b) Failure inducement (shear strength)
Shear Cell methodology widely used in the pharmaceutical industry to determine the flow properties of fine- grained powders and bulk solids and how they will behave in bins, hoppers, feeders and other handling equipment. The ability of a powder to flow through such devices is dependent on the bulk density of the material concerned and its shear strength.
Compress
Level
Shear
A
B
C
62
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