Tapped density

Tapped density is the mass divided by the volume after mechanical tapping until little or no further volume change occurs. It is always higher than bulk density because tapping removes air gaps while the mass stays the same.

1. 1Use the cylinder from the bulk density test.
2. 2Mount it on the tapped density tester.
3. 3Run the specified number of taps (standard method: 10, 500 and 1,250 taps, reading the volume after each).
4. 4If the 500- and 1,250-tap volumes differ by more than 2 mL, run a further 1,250 taps.
5. 5Record the final tapped volume.
6. 6Calculate: Tapped density = mass ÷ tapped volume, and compare with the specification.