Natural rubber is at a disadvantage against synthetic rubber for some applications requiring special properties such as a high resistance to oil. In order to expand the market for natural rubber, investigations are being undertaken into the feasibility of blending natural rubber with other polymers. Nitrile/Butadine Rubber (NBR) has good oil resistance but relatively poor strength. A combination of the oil resistance properties of this rubber and the strength properties of natural rubber would be an ideal compromise but unfortunately the difference in polarity and molecular structure between the two rubbers results in such blends having unsatisfactory properties. Our investigations set out to overcome this problem by using Epoxidized Natural Rubber for blending with NBR. A careful choice of blending technique and curing formulation were found to be essential in order to achieve blends which exhibit the desired properties. The details of these investigations are reported together with the vulcanization technology and test results on compatibility and ageing resistance.