RUBBER PROCESS OIL

A residue product from the refining process of specific type of napthenic crude oils. The same oil or different oils may be used for these purposes depending on the rubber compund. Serving as an internal lubricant in the rubber compound, it allows the use of higher molecular weight polymers, which have more desirable properties and still give a rubber compound that is acceptible for milling, mixing and extruding. These oils are also functionable for lowering the hardness of the cured rubber.