Nitrile rubber can be blended with other elastomers and thermoplastics. The predominant thermoplastic blend with NBR is with PVC. These two polymers form a miscible blend when fluxed, which imparts ozone resistance to the NBR and flexibility to the PVC. These are properties that are not present in the PVC alone. The PVC will therefore benefit with the addition of the nitrile polymer. This relationship is shown in table 1.