Powder Angle of Repose

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SOURCE: https://www.gardco.com/pages/density/powderangle.cfm

Powder Angle of Repose
BEP2 with Funnel and Angle of Repose Attachment
The widespread use of powders in the pharmaceutical industry has led to a proliferation of test methods for measuring powder flow and density.

The new Flowability Tester BEP2 provides a cost effective method for measuring the flowability of powders as specified in the US Pharmacopoeia Chapter 1174 and European Pharmacopoeia Chapter 2.9.36. It also has applications in measuring the flowability of domestic detergents (ISO 4324) and agricultural fertilizers (ISO 8398, DIN EN 12047).

The BEP2 is an easy to use, small footprint instrument.

Shown is the Angle of Repose Attachment. The angle of repose is the angle (relative to the horizontal base) of the conical pile produced when a granular material is poured onto a horizontal surface. It is related to the density, surface area and coefficient of friction of the material concerned.

The angle of repose attachment comprises a 100 mm diameter circular test platform together with a digital height gage, having a range of 0-300 mm and an accuracy of 0.03 mm. The test platform has a protruding outer lip in order to retain a layer of powder upon which the cone is formed. Surplus powder is collected in a tray below the test platform.

 

For this particular test, the funnel is normally equipped with a special 10 mm i.d. nozzle mounted 75 mm above the test platform. If necessary, the contents may be stirred to assist in the powder flow.The tangent of the angle of repose (in degrees) can be determined by reading off the height of the powder cone in mm from the digital display of the height gage and dividing it by 50. The Table below indicates the flow properties associated with corresponding Angles of Repose. Tangent Angle

 

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 56 – 55
Very poor 56 – 65
Very, very poor > 66

 

Accessory Manually operated Stirrer for Funnel Attachment

If necessary, the contents may be stirred to assist in the powder flow using the manually operated stirrer attachment.

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