Mechanical properties, such as compressibility, are
important quality indices of loose-fill packaging materials. Even though high compressibility is preferred,
customers can choose lower compressibility loose-fill
packaging materials when the shipping materials are
light and less likely to be damaged by impact forces.
Usually, low compressibility loose-fill materials have
high RER and low density. Therefore, they are cheaper
than high compressibility loose-fill packaging materials.