Heavy high Aromatic Process Oil Product Is Fully Rich Aromatic RPO By-Product From Solvent Extracting Process To Modify Physical Properties Of The Vulcanization And To Reduce The Cost Of The Finished Product. This Product Has Good Elastomeric Compatibility And Low Volatility. heavy Aromatic Process Oil Well-Known According To Its Viscosity Which Meet ASTM standards and ISO 3104 (American Society For Testing And Materials) Standard Test Method For Kinematic Viscosity Of Transparent And Opaque Liquids .