The effect of barium sulfate as a filler on the physical and mechanical properties of nitrile rubber blends

In this study, the effect of adding barium sulfate as a filler in the properties of NBR has been studied bypreparing blends of rubber containing different proportions of barium sulfate ( 20 0 phr) , ,1,3,5,10,15, on two roll millthen describe Physio - mechanical and chemical properties of the prepared blends were described by testing them fortensile strength and abrasion resistance, value of hardness and swelling in different solvents. The results showed anincrease in tensile strength by (6.1%) with an increase in the percentage of barium sulfate within the rubber mixturesuntil (1phr), then the tensile strength decreased with an increase in the ratio of barium sulfate in the rubbercompositions over (1phr). As for elongation at break, it gradually increased by (74.4%) at the rate of adding (1 phr)and then decreased with increasing the percentage of barium sulfate to (phr5) and then increased with the increase ofbarium sulfate. While the hardness values decreased by (14.9%) with the increase in the percentage of barium sulfateto the ratio of (phr20), friction resistance also decreased by (45.83%) with an increase in the percentage of bariumsulfate to (phr20). The results of the study also showed that the productivity of samples containing black carbon only(C45B0) was very low compared to samples containing barium sulfate.