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Table 4 Powder flowing properties based on angle of repose

From: Oral solid self-nanoemulsifying drug delivery systems of candesartan citexetil: formulation, characterization and in vitro drug release studies

No. Angle of repose (degrees) Type of flow
I 25–30 Excellent
II. 31–35 Good
III. 36–40 Fair (flow aid not needed)
IV. 41–45 Passable (may hang up, flow aid might be needed)
V. 46–55 Poor (agitation or vibration needed)
VI. 56–65 Very poor
VII. Over 66 Very, very poor