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

Abstract

In this study, the effect of adding barium sulfate as a filler in the properties of NBR has been studied by
preparing blends of rubber containing different proportions of barium sulfate ( 20 0 phr) , ,1,3,5,10,15, on two roll mill
then describe Physio - mechanical and chemical properties of the prepared blends were described by testing them for
tensile strength and abrasion resistance, value of hardness and swelling in different solvents. The results showed an
increase in tensile strength by (6.1%) with an increase in the percentage of barium sulfate within the rubber mixtures
until (1phr), then the tensile strength decreased with an increase in the ratio of barium sulfate in the rubber
compositions 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 of
barium sulfate. While the hardness values decreased by (14.9%) with the increase in the percentage of barium sulfate
to the ratio of (phr20), friction resistance also decreased by (45.83%) with an increase in the percentage of barium
sulfate 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.