Processing oil and method for producing the same

摘要

The processing oil contains polycyclic aromatic hydrocarbon, which is a substance known to be toxic to the human body, in an amount of less than 3 wt.% and an aromatic hydrocarbon in an amount of 25 wt.% or more, and has a kinematic viscosity at 100 DEG C of 10-30 mm<2>/s, a density of 0.870-970 g/cm<3>, and a 5 vol.% recovery temperature of 370-530 DEG C. The processing oil exhibits excellent performance which has conventionally been obtained. The processing oil can be produced by a method in which oil mixture comprising an extract obtained through extraction from mineral oil by use of a polar solvent in an amount of 40-97 vol.% and lubricating base oil in an amount of 3-60 vol.% is subjected to extraction treatment by use of a polar solvent.