Lubricants play a major role in PVC processing. An external lubricant is employed to assist the smooth passage of resin melt. An internal lubricant reduces melt viscosity allowing free movement between polymer chains and also prevents overheating which ensures the good color of the final product. There is no universal lubricant that can provide all the needed properties in the formulation. Hence, lubricants are always used in packages, as a lubricating system.