The selection of the type of a physical quality test (i.e.,
compressive resistance, abrasive resistance, or impact resistance)
used to test a particular densified product depends on
the type of forces encountered between manufacturing and
utilization. The right test is the one that simulates the way the
densified products are handled, conveyed, and stored, and
results in approximately the amount of fragmentation and
fines that are produced. For feed pellets, hardness and durability
are usually determined.