The most important item of rubber process oil is the kinematic viscosity @ 100° ,kinematic viscosity at 100° c. Can be vary from 10 up to 70, most preferable viscosity is between 30 and 60. When the kinematic viscosity is lower than 10, ordinary properties of a vulcanized rubber are decreased. When it is higher than 70 process ability and an operability in blending with a rubber become poor. Especially, in case of an aromatic vulcanized rubber, when the rubber process oil having this range of the kinematic viscosity is appropriately used according to properties of the rubber, the prevention of bleeding of a plasticizer from the vulcanized rubber can be improved. The kinematic viscosity is measured according to astm d 445.

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