301-18 EN ISO 787-11-1995 general test method for pigments and extender pigments Part 11: measurement of compaction volume and apparent density after compaction and tapped density tester
Compaction basically means that the powder is not compressed by external forces, but by the powder’s own gravity and become more compact.
This international standard specifies the equipment for measuring the pigment, and the so called apparent density after compaction is the tapped density which can be test by LABULK0335 Tapped Density Tester.
LABULK 0335 Tapped Density Tester︱Tap Density Tester︱Tapped Density Analyzer︱Tapped Density Meter