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Rubber process oils are extracted from petroleum or crude oil, once the more volatile petrol and the heating oil fractions have been differentiated through distillations. Rubber process oils are made of paraffin, naphthalene, and other such aromatic compounds of varying molecular weight distribution.
Rubber process oils, as the name suggests, are used primarily as a processing oil in rubber products manufacturing, during the mixing of rubber compounds. They improve the processing ability and filter incorporation as a plasticizer, or act as an extender.