Natural rubber, styrene-butadiene rubber and polybutadiene rubber were used to replace part of the butadiene-acrylonitrile rubber in 20/80, 30/70 and 40/60 poly (vinyl chloride)/butadiene-acrylonitrile rubber blend. Such replacement of 10, 20 and 30% of total weight of the blend was used in this work. The effect of blend composition on tensile properties, abrasion resistance, resilience, compression set, hardness, heat aging and chemical properties were investigated. PVC affect the physical properties both unvulcanisate and vulcanisate. Increasing PVC content increased mooney viscosity and 90% cure time increased but scorch time did not changed. The physical properties, tensile strength, modulus, tear strength, oil resistance, hardness, compression set and abrasion resistance of unaging as well as considerable improved by addition of the PVC. But resilience and %elongation at break decreased. Physical properties of the blend of PVC and butadiene-acrylonitrile rubber at ratio of (PVC:NBR) 20:80, 30:70 and 40:60 using natural rubber at 10, 20 percent or styrene-butadiene rubber or butadiene rubber at 10, 20, 30 percent were improved but abrasion resistance and oil resistance decreased with increased natural rubber, styrene-butadiene rubber and polybutadiene rubber content (20, 30%). The blend of PVC and butadiene-acrylonitrile rubber at ratio of (PVC:NBR) 20:80 using natural rubber at 10%, at ratio of (PVC:NBR) 30:70 using natural rubber at 10% and styrene-butadiene rubber at 10, 20% and at ratio of (PVC:NBR) 40:60 using styrene-butadiene rubber at 10% gave good physical properties and the lower price compared to blend of PVC and butadiene-acrylonitrile rubber at ratio of (PVC:NBR) 30:70.
