2.3.6. Impact strength
The impact strengths of the blends were determined using a Charpy Ceast Resil 5.5 Impact Strength Machine (CEAST S.p.a., Torino, Italy) according to ISO 179 standard with temperature of 23 C and relative humidity of 50%. The tests were performed on unnotched specimens. Length, width, and thickness of the specimens were 80, 10 and 4 mm, respectively. Width and thickness of every specimen were determined by a slide gauge. Depending on the needed impact energy, 2 J or 4 J pendulums were used. The results were reported as impact energy (J) by the impact strength machine. The impact strength was then calculated using the information of impact energies and specimen dimensions according to Formula (2).