Durability is the prevalent form of measurement and expression
of pellet quality; this property is influenced by different factors, in
particular, raw material composition and dimension.
In Fig. 4 the two different trends of pellet blends durability are
reported, and the black line indicated the minimum threshold
value according to EN 17225-6 [17].
The mechanical durability is lower in 2 PH pomace than 3 PH
due to the higher content of oil and lignin in the first one; in fact,
several studies [12] have tested the negative influence of fat/oil and