Weighed coated panels are subjected being rotated in contact with a wear surface of known parameters (hardness and composition). After specific cycles of rotation, the panels are weight and compared to previous weight.

Apparent density: Using a Hall Flowmeter, a volume of powdery substance is put to flow into a container of known volume under controlled conditions, the mass per unit volume of the powder is then recorded as the apparent density in compliance with ASTM B212-09.