A further device which can be used to determine pellet characteristics is the
pendulum (Fig. 4). The pendulum is an impact resistance testing device, by which the
amount of energy needed to fracture a pellet can be investigated. The basic principle of a
pendulum impacting device consists of a swingarm with a sample holder. From a known
height this arm with the clamped on material of interest is dropped against a non-deformable
and heavy block. The physical characteristics of the material under investigation
that are recorded, are: