Rubber Process Oil (RPO)
RPO is commercially used to produce products ranging from rubber bands to a toy to the giant tires for various vehicles including aircraft. Rubber Process Oils are used during the mixing of Rubber Compound. Rubber Process Oils are used during the mixing of rubber compounds. Rubber process oil is an Oil composition which has a kinematic viscosity at 100 °C of from 25 to 50 CST and which contains less than 3%. Polynuclear aromatic compounds are employed as a process oil for rubber compounds, especially aromatic rubbers.
Heavy RPO & Light RPO:
| Typical Properties | Unit | Test Method | Heavy RPO | Light RPO |
| Kinematic Viscosity @ 100 °C | Cst | ASTM D-445 | Min. 35 | Min. 35 |
| Density @ 100 °C | gr/cm3 | ASTM D-1298 | 1.05 | 1.01 |
| Flash Point | °C | ASTM D-92 | – | – |
| – | – | ASTM D-93 | 200-230 | 200-230 |
| Aniline Point | °C | ASTM D-611 | – | – |
| Refractive Index | – | ASTM D-1218 | 1.56 | 1.55 |
| VGC | – | ASTM D-2501 | – | – |
| PCACAA | %Wt | IP-346 | – | – |
| Oil Type | – | – | Aromatic | Aromatic |