2.3. Measurements
2.3.1. Mechanical properties
The tensile strength was measured using dumbbell shaped test pieces at a crosshead speed of 500 mm/min at 25 ± 2 °C using tensile testing machine HOUNS FILD, England. The tearing strength (load at failure/thickness) of the samples was determined using unnicked 90 °C angle test pieces according to ASTM D 624-81. The experimental conditions for the tear measurements were the same as that of the tensile testing. The hardness of the samples was measured according to ASTM D 2240-2000 using durometer type A, and the units of hardness was expressed in shore A.