JV 1000 / JV 2000 - Tapped density tester
The tapped density tester series JV have been designed to measure the tapped density of powders, granules and similar products in accordance with USP Chapter <616> Method 2 and European Pharmacopoeia Chapter 2.9.15. The JV is particularly useful in powder flowability studies and aslo in determining the amount of settlement during transit to optimize pack sizes. Tapped density is achieved by mechanically tapping a measuring cyclinder (i.e. raising the cyclinder and allowing it to drop a specified distance under its own weight) containing the sample under test.
Tapped density testing
Two versions of the tester (JV 1000 and JV 2000) are available dependent on the number of test stations required (1 or 2). Both versions utilize 250 ml measuring cylinders as standard. Smaller cylinders such as 100 ml or other volumes are also available if required.
Both of the instruments are equipped with membrane keypads for setting the number of strokes or time on an LCD screen. Progress of the test is displayed on the screen during testing.
Mode of operation
Weigh out a predetermined amount of the sample and place it in the graduated cyclinder provided and note the unsettled volume. Secure the graduated cyclinder to the test platform using the bayonet fitting provided for this purpose.
Unless otherwise specified, set the number of taps to 500 and operate the instrument making a note of the resulting tapped volume. Repeat this operation for another 750 taps noting the volume once again. Continue repeating the test in increments of 1250 taps until the difference in tapped volume is less than 2%. Note the final reading.
The tapped density in grams per ml can now be calculated and the Hausner ratio and/or compressibility index can be determined.