The stabilizers for a mixture of PVC and a nitrile rubber may comprise standard antioxidants and stabilizers including various amine and phenol antioxidants and other stabilizing materials. Typical of such stabilizer systems include sodium oleate, calcium stearate, zinc stearate, dioctyl phthalate, butylated hydroxy toluene (BHT), epoxidized soybean oil (ESO), and various barium-zinc salts.
Regardless of which stabilizer or stabilizer system is used, it is the current practice to add the stabilizer material(s), the NBR, and the PVC together. Among the problems that arise from this process include poor color stability and a need to maximize mixing time for better blending for blends of PVC and NBR