The highest mechanical durability reached for barley straw pellets
was 95.5%, with final pellet moisture of 6–8%, when ground straw
was first moistened to the rage of 19–23% of water (wt/wt, wet
basis). Pellets with low durability and a lot of fines result when
moistening below this range and, if no water is added, then no
compaction occurs at all.