Technical data of GP-01 Tap Density for Powder:

The apparent height of powder, pellet and film materials relies on the accumulation mode of pellets, in the process of tapping, the small pellet flows to the two big pellets. Thus the package of the pellet products will be more economic, the powder volume decreases, the tapping density increases, it can access to 50%-100% generally.

Tap Density:

Each particle of a solid material has the same true density after grinding, milling or processing, but more geometric space is occupied by the material. In other words, the geometric density is less... approaching 50% less than true density if the particles are spherical.

Handling or vibration of powdered material causes the smaller particles to work their way into the spaces between the larger particles. The geometric space occupied by the powder decreases and its density increases. Ultimately no further natural particle packing can be measured without the addition of pressure. Maximum particle packing is achieved.

Under controlled conditions of tap rate, tap force (fall) and cylinder diameter, the condition of maximum packing efficiency is highly reproducible. This tap density measurement is formalized in the British Pharmacopoeia method for Apparent Volume, ISO 787/11 and ASTM standard test methods B527, D1464 and D4781 for tap density.

Automated tap density determinations are performed either by GP-01 tapping tester.