COMPATIBLE blends of polyvinyl chloride/vulcanized nitrile butadiene rubber, PVC/NBR, can be readily prepared based on the common polymer polar characters. However, the enhancement of PVC contributes to the aging resistance of NBR and the fact that NBR can act as a permanent plasticizer for PVC deserve progressive evaluation of their composites.Compounding of polyvinyl chloride (PVC)/nitrile butadiene rubber (NBR) at various ratios were produced by melt mixing. Neat PVC and PVC/NBR formulations were then gamma irradiated with the integral doses of 25, 50, 100 and 150kGy. It has been indicated, that radiation- induced microstructural changes were imparted to the pristine and blend formulations. Developed unirradiated and irradiated blends were characterized by various physical, mechanical and thermal investigations: In toluene swelling and, motor and brake oils resistance, tensile strength, elastic modulus and elongation at break and, the rmogravimetric and differential scanning calorimetry analyses. The examinations described distinctive improvement in the blend respective behaviors correlated with the rubbery feed ratio and radiation dose.