PVC Lubricants are divided into two areas, internal and external. The transition between the external and internal lubricating effects is fluid, however internal lubricants often also have a certain external lubrication effect and vice versa. Lubricants having both effects are therefore called “combined lubricants”.
Internal lubricants reduce the frictional forces occurring between the PVC molecule chains, thus reducing melt viscosity. They are polar and thus highly compatible with PVC. Help achieve excellent transparency even at high dosages and do not tend to exudate, which helps optimizing the welding, gluing, and printing properties of the final product.
External lubricants reduce the adhesion between PVC and metal surfaces. They are mostly non-polar such as paraffin and polyethylene waxes. The external lubrication effect is largely determined by the length of the hydrocarbon chain, its branching and functional group. At high dosages they can lead to cloudiness and exudation.