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Hang-Up Indicizer

Measures the Arching and Ratholing Indices


Arching Index (AI)

AI is the recommended outlet diameter to ensure arch collapse in a conical bin or a measure of a powders tendency to bridge over hopper outlets. AI predicts the recommended hopper outlets to eliminate arching, angle of repose, segregation potential, packaging fill weight variations, and the effect of vibrators and flow aids. In general, a higher AI indicates poor flow and a lower AI indicates better flow. For example, a powder with a higher AI tends to stop flow in hoppers, increase variations in tablet weight, increase difficulty in filling capsules, and decrease the ability to act as a dry carrier for aerosols. There is one positive to a higher AI, and that is a decreased tendency to segregate by particle size.

Ratholing Index (RI)

RI is the recommended outlet diameter to ensure rathole failure and cleanout in a funnel-flow bin. RI predicts ratholing potential, lump formation, tableting strength, agglomeration potential and flushing potential. In general a higher RI indicates poor flowability and a lower RI indicates better flowability. For example, a higher RI indicates a greater tendency for a powder to hang up at container walls, and to form agglomerates. The positive for a higher RI is an increase in tablet strength, or a decrease in pressure to achieve an acceptable tablet strength.


Time per test: 3 minutes.
Sample size: 2" cell 95 ml, 1" cell 40 ml.
Dimensions: 31.25 inches high, 12 inches wide and 17.25 inches deep.
Weight: Approximately 55 pounds.



HANG-UP INDICIZER